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1. Status report of the n_TOF facility after the 2nd CERN long shutdown period

Author

N. Patronis, A. Mengoni, S. Goula, O. Aberle, V. Alcayne, S. Altieri, S. Amaducci, J. Andrzejewski, V. Babiano-Suarez, M. Bacak, J. Balibrea Correa, C. Beltrami, S. Bennett, A. P. Bernardes, E. Berthoumieux, R. Beyer, M. Boromiza, D. Bosnar, M. Caamaño, F. Calviño, M. Calviani, D. Cano-Ott, A. Casanovas, D. M. Castelluccio, F. Cerutti, G. Cescutti, S. Chasapoglou, E. Chiaveri, P. Colombetti, N. Colonna, P. Console Camprini, G. Cortés, M. A. Cortés-Giraldo, L. Cosentino, S. Cristallo, S. Dellmann, M. Di Castro, S. Di Maria, M. Diakaki, M. Dietz, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, Z. Eleme, S. Fargier, B. Fernández, B. Fernández-Domínguez, P. Finocchiaro, S. Fiore, F. García-Infantes, A. Gawlik-Ramiega, G. Gervino, S. Gilardoni, E. González-Romero, C. Guerrero, F. Gunsing, C. Gustavino, J. Heyse, W. Hillman, D. G. Jenkins, E. Jericha, A. Junghans, Y. Kadi, K. Kaperoni, G. Kaur, A. Kimura, I. Knapová, M. Kokkoris, M. Krtička, N. Kyritsis, I. Ladarescu, C. Lederer-Woods, J. Lerendegui-Marco, G. Lerner, A. Manna, T. Martínez, A. Masi, C. Massimi, P. Mastinu, M. Mastromarco, E. A. Maugeri, A. Mazzone, E. Mendoza, V. Michalopoulou, P. M. Milazzo, R. Mucciola, F. Murtas, E. Musacchio-Gonzalez, A. Musumarra, A. Negret, A. Pérez de Rada, P. Pérez-Maroto, J. A. Pavón-Rodríguez, M. G. Pellegriti, J. Perkowski, C. Petrone, E. Pirovano, J. Plaza del Olmo, S. Pomp, I. Porras, J. Praena, J. M. Quesada, R. Reifarth, D. Rochman, Y. Romanets, C. Rubbia, A. Sánchez-Caballero, M. Sabaté-Gilarte, P. Schillebeeckx, D. Schumann, A. Sekhar, A. G. Smith, N. V. Sosnin, M. E. Stamati, A. Sturniolo, G. Tagliente, A. Tarifeño-Saldivia, D. Tarrío, P. Torres-Sánchez, E. Vagena, S. Valenta, V. Variale, P. Vaz, G. Vecchio, D. Vescovi, V. Vlachoudis, R. Vlastou, A. Wallner, P. J. Woods, R. Zarrella, and P. Zugec

Subjects
Neutron time of flight, Spallation target, Nuclear astrophysics, Neutron physics, Neutron induced fission, Neutron reactions, Physics, QC1-999, Optics. Light, QC350-467, Descriptive and experimental mechanics, QC120-168.85
Abstract

Abstract During the second long shutdown period of the CERN accelerator complex (LS2, 2019-2021), several upgrade activities took place at the n_TOF facility. The most important have been the replacement of the spallation target with a next generation nitrogen-cooled lead target. Additionally, a new experimental area, at a very short distance from the target assembly (the NEAR Station) was established. In this paper, the core commissioning actions of the new installations are described. The improvement in the n_TOF infrastructure was accompanied by several detector development projects. All these upgrade actions are discussed, focusing mostly on the future perspectives of the n_TOF facility. Furthermore, some indicative current and future measurements are briefly reported.

Published
2023
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2. Cross-shell states in 15C: A test for p-sd interactions

Author

J. Lois-Fuentes, B. Fernández-Domínguez, X. Pereira-López, F. Delaunay, W.N. Catford, A. Matta, N.A. Orr, T. Duguet, T. Otsuka, V. Somà, O. Sorlin, T. Suzuki, N.L. Achouri, M. Assié, S. Bailey, B. Bastin, Y. Blumenfeld, R. Borcea, M. Caamaño, L. Caceres, E. Clément, A. Corsi, N. Curtis, Q. Deshayes, F. Farget, M. Fisichella, G. de France, S. Franchoo, M. Freer, J. Gibelin, A. Gillibert, G.F. Grinyer, F. Hammache, O. Kamalou, A. Knapton, Tz. Kokalova, V. Lapoux, B. Le Crom, S. Leblond, F.M. Marqués, P. Morfouace, J. Pancin, L. Perrot, J. Piot, E. Pollacco, D. Ramos, D. Regueira-Castro, C. Rodríguez-Tajes, T. Roger, F. Rotaru, M. Sénoville, N. de Séréville, R. Smith, M. Stanoiu, I. Stefan, C. Stodel, D. Suzuki, J.C. Thomas, N. Timofeyuk, M. Vandebrouck, J. Walshe, and C. Wheldon

Subjects
One neutron pick-up reaction, Neutron-rich carbon isotopes, Phenomenological shell-model, Ab initio calculations, Physics, QC1-999
Abstract

The low-lying structure of 15C has been investigated via the neutron-removal 16C(d,t) reaction. Along with the known bound neutron sd-shell states, unbound p-shell hole states have been observed. The excitation energies and the deduced spectroscopic factors of the cross-shell states are an important measure of the [(p)−1(sd)2] neutron configurations in 15C. Our results show a very good agreement with shell-model calculations using the SFO-tls interaction for 15C. However, this same interaction predicted energies that were too low for the corresponding hole states in the N=9 isotone 17O and adjustment of the p-sd and sd-sd monopole terms was required to match the 17O energies. In addition, the excitation energies and spectroscopic factors have been compared to the first calculations of 15C with the ab initio self-consistent Green's function method employing the NNLOsat interaction. The results show the sensitivity to the size of the N=8 shell gap and highlight the need to go beyond the current truncation scheme.

Published
2023
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3. Corrigendum: 'Measurement of 73Ge(n,γ) cross sections and implications for stellar nucleosynthesis' [Phys. Lett. B 790 (2019) 458–465]

Author

C. Lederer-Woods, U. Battino, P. Ferreira, A. Gawlik, C. Guerrero, F. Gunsing, S. Heinitz, J. Lerendegui-Marco, A. Mengoni, R. Reifarth, A. Tattersall, S. Valenta, C. Weiss, O. Aberle, J. Andrzejewski, L. Audouin, V. Bécares, M. Bacak, J. Balibrea, M. Barbagallo, S. Barros, F. Bečvář, C. Beinrucker, F. Belloni, E. Berthoumieux, J. Billowes, D. Bosnar, M. Brugger, M. Caamaño, F. Calviño, M. Calviani, D. Cano-Ott, F. Cerutti, E. Chiaveri, N. Colonna, G. Cortés, M.A. Cortés-Giraldo, L. Cosentino, L.A. Damone, K. Deo, M. Diakaki, M. Dietz, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, B. Fernández-Domínguez, A. Ferrari, P. Finocchiaro, R.J.W. Frost, V. Furman, K. Göbel, A.R. García, I. Gheorghe, T. Glodariu, I.F. Gonçalves, E. González-Romero, A. Goverdovski, E. Griesmayer, H. Harada, T. Heftrich, A. Hernández-Prieto, J. Heyse, D.G. Jenkins, E. Jericha, F. Käppeler, Y. Kadi, T. Katabuchi, P. Kavrigin, V. Ketlerov, V. Khryachkov, A. Kimura, N. Kivel, I. Knapova, M. Kokkoris, M. Krtička, E. Leal-Cidoncha, H. Leeb, M. Licata, S. Lo Meo, R. Losito, D. Macina, J. Marganiec, T. Martínez, C. Massimi, P. Mastinu, M. Mastromarco, F. Matteucci, E. Mendoza, P.M. Milazzo, F. Mingrone, M. Mirea, S. Montesano, A. Musumarra, R. Nolte, F.R. Palomo-Pinto, C. Paradela, N. Patronis, A. Pavlik, J. Perkowski, J.I. Porras, J. Praena, J.M. Quesada, T. Rauscher, A. Riego-Perez, M. Robles, C. Rubbia, J.A. Ryan, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, P. Sedyshev, A.G. Smith, A. Stamatopoulos, S.V. Suryanarayana, G. Tagliente, J.L. Tain, A. Tarifeño-Saldivia, L. Tassan-Got, A. Tsinganis, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, S. Warren, M. Weigand, T. Wright, and P. Žugec

Subjects
Physics, QC1-999
Published
2023
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4. 4D-imaging of drip-line radioactivity by detecting proton emission from 54mNi pictured with ACTAR TPC

Author

J. Giovinazzo, T. Roger, B. Blank, D. Rudolph, B. A. Brown, H. Alvarez-Pol, A. Arokia Raj, P. Ascher, M. Caamaño-Fresco, L. Caceres, D. M. Cox, B. Fernández-Domínguez, J. Lois-Fuentes, M. Gerbaux, S. Grévy, G. F. Grinyer, O. Kamalou, B. Mauss, A. Mentana, J. Pancin, J. Pibernat, J. Piot, O. Sorlin, C. Stodel, J.-C. Thomas, and M. Versteegen

Subjects
Science
Abstract

Proton radioactivity is useful for studying nuclear structure. Here the authors report two proton emission branches from the 10+ state isomer of 54mNi by using a time projection chamber.

Published
2021
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5. Mirror symmetry at mass A = 54: E4 effective charges near doubly magic 56Ni

Author

D. Rudolph, B. Blank, J. Giovinazzo, T. Roger, H. Alvarez-Pol, A. Arokia Raj, P. Ascher, M. Caamaño-Fresco, L. Caceres, D.M. Cox, B. Fernández-Domínguez, J. Lois-Fuentes, M. Gerbaux, S. Grévy, G.F. Grinyer, O. Kamalou, B. Mauss, A. Mentana, J. Pancin, J. Pibernat, J. Piot, O. Sorlin, C. Stodel, J.-C. Thomas, and M. Versteegen

Subjects
54Ni, Nuclear shell model, Isospin symmetry, Electromagnetic decay, E4 transition, Effective charges, Physics, QC1-999
Abstract

Proton-emission branches of the 10+ isomer in the Tz=−1 nucleus 54Ni have been imaged with the active target and time projection chamber (ACTAR TPC) in an experiment conducted at the Grand Accélérateur National d'Ions Lourds (GANIL). The completed decay scheme allows derivation of the reduced transition strengths, B(E2;10+→8+) and B(E4;10+→6+), for the two competing γ-ray transitions. By means of a comparison with their well-known ‘mirror transitions’ in Tz=+1 54Fe, and aided by a variety of shell-model calculations in the fp model space, effective charges for E4 transitions near N=Z 56Ni can be deduced: επ≈1.40 and εν≈0.30. Mirror-energy differences are explored with various shell-model interactions and isospin-symmetry breaking terms.

Published
2022
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6. Experimental investigation of ground-state properties of 7H with transfer reactions

Author

M. Caamaño, T. Roger, A.M. Moro, G.F. Grinyer, J. Pancin, S. Bagchi, S. Sambi, J. Gibelin, B. Fernández–Domínguez, N. Itagaki, J. Benlliure, D. Cortina–Gil, F. Farget, B. Jacquot, D. Pérez–Loureiro, B. Pietras, R. Raabe, D. Ramos, C. Rodríguez Tajes, H. Savajols, and M. Vandebrouck

Subjects
7H, Hydrogen resonance, Active target, Physics, QC1-999
Abstract

The properties of nuclei with extreme neutron–to–proton ratios, far from those naturally occurring on Earth, are key to understand nuclear forces and how nucleons hold together to form nuclei. 7H, with six neutrons and a single proton, is the nuclear system with the most unbalanced neutron–to–proton ratio known so far. However, its sheer existence and properties are still a challenge for experimental efforts and theoretical models. Here we report experimental evidences on the formation of 7H as a resonance, detected with independent observables, and the first measurement of the structure of its ground state. The resonance is found at ∼0.7 MeV above the 3H+4n mass, with a narrow width of ∼0.2 MeV and a 1/2+ spin and parity. These data are consistent with a 7H as a 3H core surrounded by an extended four-neutron halo, with a unique four-neutron decay and a relatively long half-life thanks to neutron pairing; a prime example of new phenomena occurring in what would be the most pure-neutron nuclear matter we can access in the laboratory.

Published
2022
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7. Author Correction: 4D-imaging of drip-line radioactivity by detecting proton emission from 54mNi pictured with ACTAR TPC

Author

J. Giovinazzo, T. Roger, B. Blank, D. Rudolph, B. A. Brown, H. Alvarez-Pol, A. Arokia Raj, P. Ascher, M. Caamaño-Fresco, L. Caceres, D. M. Cox, B. Fernández-Domínguez, J. Lois-Fuentes, M. Gerbaux, S. Grévy, G. F. Grinyer, O. Kamalou, B. Mauss, A. Mentana, J. Pancin, J. Pibernat, J. Piot, O. Sorlin, C. Stodel, J.-C. Thomas, and M. Versteegen

Subjects
Science
Published
2022
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8. Measurement of 73Ge(n,γ) cross sections and implications for stellar nucleosynthesis

Author

C. Lederer-Woods, U. Battino, P. Ferreira, A. Gawlik, C. Guerrero, F. Gunsing, S. Heinitz, J. Lerendegui-Marco, A. Mengoni, R. Reifarth, A. Tattersall, S. Valenta, C. Weiss, O. Aberle, J. Andrzejewski, L. Audouin, V. Bécares, M. Bacak, J. Balibrea, M. Barbagallo, S. Barros, F. Bečvář, C. Beinrucker, F. Belloni, E. Berthoumieux, J. Billowes, D. Bosnar, M. Brugger, M. Caamaño, F. Calviño, M. Calviani, D. Cano-Ott, F. Cerutti, E. Chiaveri, N. Colonna, G. Cortés, M.A. Cortés-Giraldo, L. Cosentino, L.A. Damone, K. Deo, M. Diakaki, M. Dietz, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, B. Fernández-Domínguez, A. Ferrari, P. Finocchiaro, R.J.W. Frost, V. Furman, K. Göbel, A.R. García, I. Gheorghe, T. Glodariu, I.F. Gonçalves, E. González-Romero, A. Goverdovski, E. Griesmayer, H. Harada, T. Heftrich, A. Hernández-Prieto, J. Heyse, D.G. Jenkins, E. Jericha, F. Käppeler, Y. Kadi, T. Katabuchi, P. Kavrigin, V. Ketlerov, V. Khryachkov, A. Kimura, N. Kivel, I. Knapova, M. Kokkoris, M. Krtička, E. Leal-Cidoncha, H. Leeb, M. Licata, S. Lo Meo, R. Losito, D. Macina, J. Marganiec, T. Martínez, C. Massimi, P. Mastinu, M. Mastromarco, F. Matteucci, E. Mendoza, P.M. Milazzo, F. Mingrone, M. Mirea, S. Montesano, A. Musumarra, R. Nolte, F.R. Palomo-Pinto, C. Paradela, N. Patronis, A. Pavlik, J. Perkowski, J.I. Porras, J. Praena, J.M. Quesada, T. Rauscher, A. Riego-Perez, M. Robles, C. Rubbia, J.A. Ryan, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, P. Sedyshev, A.G. Smith, A. Stamatopoulos, S.V. Suryanarayana, G. Tagliente, J.L. Tain, A. Tarifeño-Saldivia, L. Tassan-Got, A. Tsinganis, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, S. Warren, M. Weigand, T. Wright, and P. Žugec

Subjects
Physics, QC1-999
Abstract

73Ge(n,γ) cross sections were measured at the neutron time-of-flight facility n_TOF at CERN up to neutron energies of 300 keV, providing for the first time experimental data above 8 keV. Results indicate that the stellar cross section at kT=30 keV is 1.5 to 1.7 times higher than most theoretical predictions. The new cross sections result in a substantial decrease of 73Ge produced in stars, which would explain the low isotopic abundance of 73Ge in the solar system. Keywords: Nucleosynthesis, Neutron capture, s process, Germanium, n_TOF

Published
2019
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9. Low-lying single-particle structure of 17C and the N = 14 sub-shell closure

Author

X. Pereira-López, B. Fernández-Domínguez, F. Delaunay, N.L. Achouri, N.A. Orr, W.N. Catford, M. Assié, S. Bailey, B. Bastin, Y. Blumenfeld, R. Borcea, M. Caamaño, L. Caceres, E. Clément, A. Corsi, N. Curtis, Q. Deshayes, F. Farget, M. Fisichella, G. de France, S. Franchoo, M. Freer, J. Gibelin, A. Gillibert, G.F. Grinyer, F. Hammache, O. Kamalou, A. Knapton, T. Kokalova, V. Lapoux, J.A. Lay, B. Le Crom, S. Leblond, J. Lois-Fuentes, F.M. Marqués, A. Matta, P. Morfouace, A.M. Moro, T. Otsuka, J. Pancin, L. Perrot, J. Piot, E. Pollacco, D. Ramos, C. Rodríguez-Tajes, T. Roger, F. Rotaru, M. Sénoville, N. de Séréville, R. Smith, O. Sorlin, M. Stanoiu, I. Stefan, C. Stodel, D. Suzuki, T. Suzuki, J.C. Thomas, N. Timofeyuk, M. Vandebrouck, J. Walshe, and C. Wheldon

Subjects
Physics, QC1-999
Abstract

The first investigation of the single-particle structure of the bound states of 17C, via the d(16C,p) transfer reaction, has been undertaken. The measured angular distributions confirm the spin-parity assignments of 1/2+ and 5/2+ for the excited states located at 217 and 335 keV, respectively. The spectroscopic factors deduced for these states exhibit a marked single-particle character, in agreement with shell model and particle-core model calculations, and combined with their near degeneracy in energy provide clear evidence for the absence of the N=14 sub-shell closure. The very small spectroscopic factor found for the 3/2+ ground state is consistent with theoretical predictions and indicates that the ν1d3/2 strength is carried by unbound states. With a dominant ℓ=0 valence neutron configuration and a very low separation energy, the 1/2+ excited state is a one-neutron halo candidate.

Published
2020
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10. Re-examining the transition into the N=20 island of inversion: Structure of 30Mg

Author

B. Fernández-Domínguez, B. Pietras, W.N. Catford, N.A. Orr, M. Petri, M. Chartier, S. Paschalis, N. Patterson, J.S. Thomas, M. Caamaño, T. Otsuka, A. Poves, N. Tsunoda, N.L. Achouri, J.-C. Angélique, N.I. Ashwood, A. Banu, B. Bastin, R. Borcea, J. Brown, F. Delaunay, S. Franchoo, M. Freer, L. Gaudefroy, S. Heil, M. Labiche, B. Laurent, R.C. Lemmon, A.O. Macchiavelli, F. Negoita, E.S. Paul, C. Rodríguez-Tajes, P. Roussel-Chomaz, M. Staniou, M.J. Taylor, L. Trache, and G.L. Wilson

Subjects
Physics, QC1-999
Abstract

Intermediate energy single-neutron removal from 31Mg has been employed to investigate the transition into the N=20 island of inversion. Levels up to 5 MeV excitation energy in 30Mg were populated and spin-parity assignments were inferred from the corresponding longitudinal momentum distributions and γ-ray decay scheme. Comparison with eikonal-model calculations also permitted spectroscopic factors to be deduced. Surprisingly, the 02+ level in 30Mg was found to have a strength much weaker than expected in the conventional picture of a predominantly 2p−2h intruder configuration having a large overlap with the deformed 31Mg ground state. In addition, negative parity levels were identified for the first time in 30Mg, one of which is located at low excitation energy. The results are discussed in the light of shell-model calculations employing two newly developed approaches with markedly different descriptions of the structure of 30Mg. It is concluded that the cross-shell effects in the region of the island of inversion at Z=12 are considerably more complex than previously thought and that np−nh configurations play a major role in the structure of 30Mg.

Published
2018
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11. Evolution of single-particle strength in neutron-rich 71Cu

Author

P. Morfouace, S. Franchoo, K. Sieja, I. Matea, L. Nalpas, M. Niikura, A.M. Sánchez-Benítez, I. Stefan, M. Assié, F. Azaiez, D. Beaumel, S. Boissinot, C. Borcea, R. Borcea, G. Burgunder, L. Cáceres, N. De Séréville, Zs. Dombrádi, J. Elseviers, B. Fernández-Domínguez, A. Gillibert, S. Giron, S. Grévy, F. Hammache, O. Kamalou, V. Lapoux, L. Lefebvre, A. Lepailleur, C. Louchart, G. Marquinez-Duran, I. Martel, A. Matta, D. Mengoni, D.R. Napoli, F. Recchia, J.-A. Scarpaci, D. Sohler, O. Sorlin, M. Stanoiu, C. Stodel, J.-C. Thomas, and Zs. Vajta

Subjects
Physics, QC1-999
Abstract

The strength functions of the πf5/2, πp3/2 and πf7/2 orbitals in neutron-rich 71Cu were obtained in a 72Zn(d,3He)71Cu proton pick-up reaction in inverse kinematics using a radioactive beam of 72Zn at 38 MeV/u. A dedicated set-up was developed to overcome the experimental challenges posed by the low cross section of the reaction and the low energy of the outgoing 3He particles. The excitation-energy spectrum was reconstructed and spectroscopic factors were obtained after analysis of the angular distributions with the finite-range Distorted-Wave Born Approximation (DWBA). The results show that unlike for the πf5/2 orbital and contrary to earlier interpretation, the πf7/2 single-particle strength distribution is not appreciably affected by the addition of neutrons beyond N=40.

Published
2015
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12. Observation of isoscalar multipole strengths in exotic doubly-magic 56Ni in inelastic α scattering in inverse kinematics

Author

S. Bagchi, J. Gibelin, M.N. Harakeh, N. Kalantar-Nayestanaki, N.L. Achouri, H. Akimune, B. Bastin, K. Boretzky, H. Bouzomita, M. Caamaño, L. Càceres, S. Damoy, F. Delaunay, B. Fernández-Domínguez, M. Fujiwara, U. Garg, G.F. Grinyer, O. Kamalou, E. Khan, A. Krasznahorkay, G. Lhoutellier, J.F. Libin, S. Lukyanov, K. Mazurek, M.A. Najafi, J. Pancin, Y. Penionzhkevich, L. Perrot, R. Raabe, C. Rigollet, T. Roger, S. Sambi, H. Savajols, M. Senoville, C. Stodel, L. Suen, J.C. Thomas, M. Vandebrouck, and J. Van de Walle

Subjects
Physics, QC1-999
Abstract

The Isoscalar Giant Monopole Resonance (ISGMR) and the Isoscalar Giant Dipole Resonance (ISGDR) compression modes have been studied in the doubly-magic unstable nucleus 56Ni. They were measured by inelastic α-particle scattering in inverse kinematics at 50 MeV/u with the MAYA active target at the GANIL facility. The centroid of the ISGMR has been obtained at Ex=19.1±0.5 MeV. Evidence for the low-lying part of the ISGDR has been found at Ex=17.4±0.7 MeV. The strength distribution for the dipole mode shows similarity with the prediction from the Hartree–Fock (HF) based random-phase approximation (RPA) [1]. These measurements confirm inelastic α-particle scattering as a suitable probe for exciting the ISGMR and the ISGDR modes in radioactive isotopes in inverse kinematics.

Published
2015
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13. Experimental evidence of the effect of nuclear shells on fission dissipation and time

Author

D. Ramos, M. Caamaño, F. Farget, C. Rodríguez-Tajes, A. Lemasson, C. Schmitt, L. Audouin, J. Benlliure, E. Casarejos, E. Clement, D. Cortina, O. Delaune, X. Derkx, A. Dijon, D. Doré, B. Fernández-Domínguez, G. de France, A. Heinz, B. Jacquot, C. Paradela, M. Rejmund, T. Roger, M.-D. Salsac, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Nuclear Theory (nucl-th), [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

International audience; Nuclear fission is still one of the most complex physical processes we can observe in nature due to the interplay of macroscopic and microscopic nuclear properties that decide the result. An example of this coupling is the presence of nuclear dissipation as an important ingredient that contributes to drive the dynamics and has a clear impact on the time of the process. However, different theoretical interpretations, and scarce experimental data make it poorly understood. In this Letter, we present the first experimental determination of the dissipation energy in fission as a function of the fragment split, for three different fissioning systems. The amount of dissipation was obtained through the measurement of the relative production of fragments with even and odd atomic numbers with respect to different initial fission energies. The results reveal a clear effect of particular nuclear shells on the dissipation and fission dynamics. In addition, the relative production of fragments with even and odd atomic numbers appears as a potential contributor to the long-standing problem of the time scale in fission.

Published
2023

14. Neutron-induced cross section measurements

Author

C. Massimi, O. Aberle, V. Alcayne, S. Altieri, S. Amaducci, J. Andrzejewski, V. Babiano-Suarez, M. Bacak, J. Balibrea, C. Beltrami, S. Bennett, A. P. Bernardes, E. Berthoumieux, M. Boromiza, D. Bosnar, M. Caamaño, F. Calviño, M. Calviani, D. Cano-Ott, A. Casanovas, D. M. Castelluccio, F. Cerutti, G. Cescutti, S. Chasapoglou, E. Chiaveri, P. Colombetti, N. Colonna, P. Console Camprini, G. Cortés, M. A. Cortés-Giraldo, L. Cosentino, S. Cristallo, S. Dellmann, M. Di Castro, S. Di Maria, M. Diakaki, M. Dietz, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, Z. Eleme, S. Fargier, B. Fernández, B. Fernández-Domínguez, P. Finocchiaro, S. Fiore, V. Furman, F. GarcíaInfantes, A. Gawlik-Ramięga, G. Gervino, S. Gilardoni, E. González-Romero, C. Guerrero, F. Gunsing, C. Gustavino, J. Heyse, W. Hillman, D. G. Jenkins, E. Jericha, A. Junghans, Y. Kadi, K. Kaperoni, G. Kaur, A. Kimura, I. Knapová, M. Kokkoris, Y. Kopatch, M. Krtička, N. Kyritsis, I. Ladarescu, C. Lederer-Woods, J. Lerendegui-Marco, G. Lerner, A. Manna, T. Martínez, A. Masi, P. Mastinu, M. Mastromarco, E. A. Maugeri, A. Mazzone, E. Mendoza, A. Mengoni, V. Michalopoulou, P. M. Milazzo, R. Mucciola, F. Murtas, E. Musacchio-Gonzalez, A. Musumarra, A. Negret, A. Pérez de Rada, P. Pérez-Maroto, N. Patronis, J. A. Pavón-Rodríguez, M. G. Pellegriti, J. Perkowski, C. Petrone, E. Pirovano, J. Plaza, S. Pomp, I. Porras, J. Praena, J. M. Quesada, R. Reifarth, D. Rochman, Y. Romanets, C. Rubbia, A. Sánchez, M. Sabaté-Gilarte, P. Schillebeeckx, D. Schumann, A. Sekhar, A. G. Smith, N. V. Sosnin, M. E. Stamati, A. Sturniolo, G. Tagliente, D. Tarrío, P. Torres-Sánchez, S. Urlass, E. Vagena, S. Valenta, V. Variale, P. Vaz, G. Vecchio, D. Vescovi, V. Vlachoudis, R. Vlastou, A. Wallner, P. J. Woods, T. Wright, R. Zarrella, P. Žugec, Freeman, S., Lederer-Woods, C., Manna, A., and Mengoni, A.

Subjects
Subatomär fysik, cross section, n_TOF, neutron time of flight, Subatomic Physics, General Medicine
Abstract

Neutron-induced cross sections represent the main nuclear input to models of stellar and Big-Bang nucleosynthesis. While (n,γ) reactions are relevant for the formation of elements heavier than iron, (n,p) and (n,α) reactions can play an important role in specific cases. The time-of-flight method is routinely used at n_TOF to experimentally determine the cross section data. In addition, recent upgrades of the facility will allow the use of activation techniques as well, possibly opening the way to a systematic study of neutron interaction with radioactive isotopes. In the last 20 years n_TOF has provided a large amount of experimental data for Nuclear Astrophysics. Our plan is to carry on challenging measurements and produce nuclear data in the next decades as well.

Published
2023

15. Influence of proton and neutron deformed shells on the asymmetric fission of thorium isotopes

Author

A. Chatillon, J. Taïeb, A. Heinz, H. Alvarez-Pol, L. Audouin, Y. Ayyad, G. Bélier, J. Benlliure, G. Boutoux, M. Caamaño, E. Casarejos, D. Cortina-Gil, A. Ebran, F. Farget, B. Fernández-Domínguez, T. Gorbinet, L. Grente, H. T. Johansson, B. Jurado, A. Kelić-Heil, N. Kurz, B. Laurent, J.-F. Martin, C. Nociforo, C. Paradela, E. Pellereau, S. Pietri, A. Prochazka, J. L. Rodríguez-Sánchez, D. Rossi, H. Simon, L. Tassan-Got, J. Vargas, B. Voss, H. Weick, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Deux Infinis Bordeaux (LP2I - Bordeaux), and Université de Bordeaux (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; Mean values of the number of protons and neutrons of the primary fission fragments at scission are determined for the asymmetric fission of 16 fissioning isotopes, from Ac219 up to Np238. Our results confirm that the main asymmetric fission mode around the heavier uranium isotopes is indeed characterized by an average atomic number around 〈ZH〉=54 in the heavy fission fragments. However, they also unambiguously show a stabilization effect in the light fission fragments around 〈NL〉=52–54 in the neutron-deficient thorium and actinium isotopes. This is a clear signature that these deformed proton and neutron shell closures around 54 play a major role in the nuclear fission process. The evolution along the thorium chain shows that the neutron shell appears to be dominant in the asymmetric fission of the lighter thorium isotopes, in contrast to the heavier thorium isotopes for which the stabilization originates from the proton shell.

Published
2022

16. Evidence of a Near-Threshold Resonance in B11 Relevant to the β -Delayed Proton Emission of Be11

Author

Y. Ayyad, W. Mittig, T. Tang, B. Olaizola, G. Potel, N. Rijal, N. Watwood, H. Alvarez-Pol, D. Bazin, M. Caamaño, J. Chen, M. Cortesi, B. Fernández-Domínguez, S. Giraud, P. Gueye, S. Heinitz, R. Jain, B. P. Kay, E. A. Maugeri, B. Monteagudo, F. Ndayisabye, S. N. Paneru, J. Pereira, E. Rubino, C. Santamaria, D. Schumann, J. Surbrook, L. Wagner, J. C. Zamora, and V. Zelevinsky

Subjects
General Physics and Astronomy
Published
2022

17. High accuracy, high resolution $^{235}$U(n,f) cross section from n_TOF (CERN) from 18 meV to 10 keV

Author

M. Mastromarco, S. Amaducci, N. Colonna, P. Finocchiaro, L. Cosentino, M. Barbagallo, O. Aberle, J. Andrzejewski, L. Audouin, M. Bacak, J. Balibrea, F. Bečvář, E. Berthoumieux, J. Billowes, D. Bosnar, A. Brown, M. Caamaño, F. Calviño, M. Calviani, D. Cano-Ott, R. Cardella, A. Casanovas, F. Cerutti, Y. H. Chen, E. Chiaveri, G. Cortés, M. A. Cortés-Giraldo, L. A. Damone, M. Diakaki, C. Domingo-Pardo, D. Diacono, R. Dressler, E. Dupont, I. Durán, B. Fernández-Domínguez, A. Ferrari, P. Ferreira, V. Furman, K. Göbel, A. R. García, A. Gawlik, S. Gilardoni, T. Glodariu, I. F. Gonçalves, E. González-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, H. Harada, S. Heinitz, J. Heyse, D. G. Jenkins, E. Jericha, F. Käppeler, Y. Kadi, A. Kalamara, P. Kavrigin, A. Kimura, N. Kivel, I. Knapova, M. Kokkoris, M. Krtička, D. Kurtulgil, E. Leal-Cidoncha, C. Lederer, H. Leeb, J. Lerendegui-Marco, S. Lo Meo, S. J. Lonsdale, D. Macina, A. Manna, J. Marganiec, T. Martínez, A. Masi, C. Massimi, P. Mastinu, E. A. Maugeri, A. Mazzone, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, A. Musumarra, A. Negret, R. Nolte, A. Oprea, N. Patronis, A. Pavlik, J. Perkowski, I. Porras, J. Praena, J. M. Quesada, D. Radeck, T. Rauscher, R. Reifarth, C. Rubbia, J. A. Ryan, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, D. Schumann, P. Sedyshev, A. G. Smith, N. V. Sosnin, A. Stamatopoulos, G. Tagliente, J. L. Tain, A. Tarifeño-Saldivia, L. Tassan-Got, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, S. Warren, C. Weiss, P. J. Woods, T. Wright, P. Žugec, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Mastromarco, M, Amaducci, S, Colonna, N, Finocchiaro, P, Cosentino, L, Barbagallo, M, Aberle, O, Andrzejewski, J, Audouin, L, Bacak, M, Balibrea, J, Becvar, F, Berthoumieux, E, Billowes, J, Bosnar, D, Brown, A, Caamano, M, Calvino, F, Calviani, M, Cano-Ott, D, Cardella, R, Casanovas, A, Cerutti, F, Chen, YH, Chiaveri, E, Cortes, G, Cortes-Giraldo, MA, Damone, LA, Diakaki, M, Domingo-Pardo, C, Diacono, D, Dressler, R, Dupont, E, Duran, I, Fernandez-Dominguez, B, Ferrari, A, Ferreira, P, Furman, V, Gobel, K, Garcia, AR, Gawlik, A, Gilardoni, S, Glodariu, T, Goncalves, IF, Gonzalez-Romero, E, Griesmayer, E, Guerrero, C, Gunsing, F, Harada, H, Heinitz, S, Heyse, J, Jenkins, DG, Jericha, E, Kappeler, F, Kadi, Y, Kalamara, A, Kavrigin, P, Kimura, A, Kivel, N, Knapova, I, Kokkoris, M, Krticka, M, Kurtulgil, D, Leal-Cidoncha, E, Lederer, C, Leeb, H, Lerendegui-Marco, J, LoMeo, S, Lonsdale, SJ, Macina, D, Manna, A, Marganiec, J, Martinez, T, Masi, A, Massimi, C, Mastinu, P, Maugeri, EA, Mazzone, A, Mendoza, E, Mengoni, A, Milazzo, PM, Mingrone, F, Musumarra, A, Negret, A, Nolte, R, Oprea, A, Patronis, N, Pavlik, A, Perkowski, J, Porras, I, Praena, J, Quesada, JM, Radeck, D, Rauscher, T, Reifarth, R, Rubbia, C, Ryan, JA, Sabate-Gilarte, M, Saxena, A, Schillebeeckx, P, Schumann, D, Sedyshev, P, Smith, AG, Sosnin, NV, Stamatopoulos, A, Tagliente, G, Tain, JL, Tarifeno-Saldivia, A, Tassan-Got, L, Valenta, S, Vannini, G, Variale, V, Vaz, P, Ventura, A, Vlachoudis, V, Vlastou, R, Wallner, A, Warren, S, Weiss, C, Woods, PJ, Wright, T, Zugec, P, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and n_TOF

Subjects
Neutrons, Nuclear and High Energy Physics, Fission, Energies [Àrees temàtiques de la UPC], Nuclear physics, 235U, fission, cross section, n_TOF, CERN, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Espectroscòpia de ressonància magnètica nuclear, Resonance, n_TOF, cross section, 235U, CERN, Física nuclear, Nuclear Physics - Experiment, Nuclear Experiment, Nuclear magnetic resonance spectroscopy, Neutron energy
Abstract

The 235U(n,f) cross section was measured in a wide energy range (18 meV–170 keV) at the n_TOF facility at CERN, relative to 6Li(n,t) and 10B(n,α) standard reactions, with high resolution and accuracy, with a setup based on a stack of six samples and six silicon detectors placed in the neutron beam. In this paper we report on the results in the region between 18 meV and 10 keV neutron energy. A resonance analysis has been performed up to 200 eV, with the code SAMMY. The resulting fission kernels are compared with the ones extracted on the basis of the resonance parameters of the most recent major evaluated data libraries.Acomparison of the n_TOF datawith the evaluated cross sections is also performed from thermal to 10 keV neutron energy for the energy-averaged cross section in energy groups of suitably chosen width. A good agreement, within 0.5%, is found on average between the new results and the latest evaluated data files ENDF/B-VIII.0 and JEFF-3.3, as well as with respect to the broad group average fission cross section established in the framework of the standard working group of IAEA (the so-called reference file). However, some discrepancies, of up to 4%, are still present in some specific energy regions. The newdataset here presented, characterized by a unique combination of high resolution and accuracy, low background and wide energy range, can help to improve the evaluations from the Resolved Resonance Region up to 10 keV, also reducing the uncertainties that affect this region., CERN (European Organization for Nuclear Research)

Published
2022

18. Observation of a correlated free four-neutron system

Author

M. Duer, T. Aumann, R. Gernhäuser, V. Panin, S. Paschalis, D. M. Rossi, N. L. Achouri, D. Ahn, H. Baba, C. A. Bertulani, M. Böhmer, K. Boretzky, C. Caesar, N. Chiga, A. Corsi, D. Cortina-Gil, C. A. Douma, F. Dufter, Z. Elekes, J. Feng, B. Fernández-Domínguez, U. Forsberg, N. Fukuda, I. Gasparic, Z. Ge, J. M. Gheller, J. Gibelin, A. Gillibert, K. I. Hahn, Z. Halász, M. N. Harakeh, A. Hirayama, M. Holl, N. Inabe, T. Isobe, J. Kahlbow, N. Kalantar-Nayestanaki, D. Kim, S. Kim, T. Kobayashi, Y. Kondo, D. Körper, P. Koseoglou, Y. Kubota, I. Kuti, P. J. Li, C. Lehr, S. Lindberg, Y. Liu, F. M. Marqués, S. Masuoka, M. Matsumoto, J. Mayer, K. Miki, B. Monteagudo, T. Nakamura, T. Nilsson, A. Obertelli, N. A. Orr, H. Otsu, S. Y. Park, M. Parlog, P. M. Potlog, S. Reichert, A. Revel, A. T. Saito, M. Sasano, H. Scheit, F. Schindler, S. Shimoura, H. Simon, L. Stuhl, H. Suzuki, D. Symochko, H. Takeda, J. Tanaka, Y. Togano, T. Tomai, H. T. Törnqvist, J. Tscheuschner, T. Uesaka, V. Wagner, H. Yamada, B. Yang, L. Yang, Z. H. Yang, M. Yasuda, K. Yoneda, L. Zanetti, J. Zenihiro, M. V. Zhukov, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Research unit Nuclear & Hadron Physics, and Nuclear Energy

Subjects
Multidisciplinary, Nuclear Force, Nuclear Structure, Tetraneutron, Reactions with Radioactive Beams, Physics, ddc:500, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

Nature 606(7915), 678 - 682 (2022). doi:10.1038/s41586-022-04827-6, Published by Nature Publ. Group, London [u.a.]

Published
2022

19. Experimental study of high-energy fission and quasi-fission dynamics with fusion-induced fission reactions at VAMOS++

Author

D. Fernández, M. Caamaño, D. Ramos, A. Lemasson, M. Rejmund, H. Álvarez-Pol, L. Audouin, J. D. Frankland, B. Fernández-Domínguez, E. Galiana-Baldó, J. Piot, C. Schmitt, D. Ackermann, S. Biswas, E. Clement, D. Durand, F. Farget, M. O. Fregeau, D. Galaviz, A. Heinz, A. Henriques, B. Jacquot, B. Jurado, Y. H. Kim, P. Morfouace, D. Ralet, T. Roger, P. Teubig, and I. Tsekhanovich

Subjects
General Medicine
Abstract

During the last decade, the use of inverse kinematics in the experimental study of fission is bringing a wealth of new observables obtained in single measurements, allowing their analysis and their correlations. An ongoing application of this technique is the basis of a series of experiments performed with the variable-mode, large-acceptance VAMOS++ spectrometer at GANIL. A recent experiment has been focused on the survival of the nuclear structure effects at high excitation energy in fission and quasi-fission. The full isotopic identification of fragments, the fission dynamics and the ratio between the production of fragments with even and odd atomic numbers, the so-called proton even-odd effect, are shown. The latter shows a different mechanism for fission and quasi-fission that could be used to separate fission from quasi-fission.

Published
2023

20. Overview of the dissemination of n_TOF experimental data and resonance parameters

Author

E. Dupont, N. Otuka, D. Rochman, G. Nogèure, O. Aberle, V. Alcayne, S. Altieri, S. Amaducci, J. Andrzejewski, V. Babiano-Suarez, M. Bacak, J. Balibrea, C. Beltrami, S. Bennett, A.P. Bernardes, E. Berthoumieux, R. Beyer, M. Boromiza, D. Bosnar, M. Caamaño, F. Calviño, M. Calviani, D. Cano-Ott, A. Casanovas, F. Cerutti, G. Cescutti, E. Chiaveri, P. Colombetti, N. Colonna, P. Console Camprini, G. Cortés, M.A. Cortés-Giraldo, L. Cosentino, S. Cristallo, S. Dellmann, M. Di Castro, S. Di Maria, M. Diakaki, M. Dietz, C. Domingo-Pardo, R. Dressler, I. Durán, Z. Eleme, S. Fargier, B. Fernández, B. Fernández-Domínguez, P. Finocchiaro, S. Fiore, V. Furman, F. García-Infantes, A. Gawlik-Ramięga, G. Gervino, S. Gilardoni, E. González-Romero, C. Guerrero, F. Gunsing, C. Gustavino, J. Heyse, W. Hillman, G.D. Jenkins, E. Jericha, A. Junghans, Y. Kadi, K. Kaperoni, G. Kaur, A. Kimura, I. Knapová, M. Kokkoris, Y. Kopatch, M. Krtička, N. Kyritsis, I. Ladarescu, C. Lederer-Woods, J. Lerendegui-Marco, G. Lerner, A. Manna, T. Martínez, A. Masi, C. Massimi, P. Mastinu, M. Mastromarco, E.A. Maugeri, A. Mazzone, E. Mendoza, A. Mengoni, V. Michalopoulou, P.M. Milazzo, R. Mucciola, F. Murtas, E. Musacchio-Gonzalez, A. Musumarra, A. Negret, A. Pérez de Rada, P. Pérez-Maroto, N. Patronis, J.A. Pavón-Rodrgíuez, M.G. Pellegriti, J. Perkowski, C. Petrone, E. Pirovano, J. Plaza, S. Pomp, I. Porras, J. Praena, J.M. Quesada, R. Reifarth, Y. Romanets, C. Rubbia, A. Sánchez-Caballero, M. Sabaté-Gilarte, P. Schillebeeckx, D. Schumann, A. Sekhar, A.G. Smith, N.V. Sosnin, M.E. Stamati, A. Sturniolo, G. Tagliente, A. Tarifeño-Saldivia, D. Taríro, P. Torres-Sánchez, E. Vagena, S. Valenta, V. Variale, P. Vaz, G. Vecchio, D. Vescovi, V. Vlachoudis, R. Vlastou, A. Wallner, P.J. Woods, T. Wright, R. Zarrella, and P. Žugec

Subjects
General Medicine
Abstract

The n_TOF neutron time-of-flight facility at CERN is used for nuclear data measurements. The n_TOF Collaboration works closely with the Nuclear Reaction Data Centres (NRDC) network to disseminate the experimental data through the international EXFOR library. In addition, the Collaboration helps integrate the results in the evaluated library projects. The present contribution describes the dissemination status of n_TOF results, their impact on evaluated libraries and ongoing efforts to provide n_TOF resonance parameters in ENDF-6 format for further use by evaluation projects.

Published
2023

21. Measurement of the 241Am(n,γ) cross section at the n_TOF facility at CERN

Author

A. Oprea, F. Gunsing, P. Schillebeeckx, O. Aberle, M. Bacak, E. Berthoumieux, D. Cano-Ott, M. Diakaki, E. Dupont, B. Geslot, T. Glodariu†, J. Heyse, E. Mendoza, A. Negret, V. Alcayne, S. Amaducci, J. Andrzejewski, L. Audouin, V. Bécares, V. Babiano-Suarez, M. Barbagallo, F. Bečvář, G. Bellia, J. Billowes, D. Bosnar, A. Brown, M. Busso, M. Caamaño, L. Caballero-Ontanaya, F. Calviño, M. Calviani, A. Casanovas, F. Cerutti, Y. H. Chen, E. Chiaveri, N. Colonna, G. Cortés, M. A. Cortés-Giraldo, L. Cosentino, S. Cristallo, L. A. Damone, M. Dietz, C. Domingo-Pardo, R. Dressler, I. Durán, Z. Eleme, B. Fernández-Domínguez, A. Ferrari, P. Finocchiaro, V. Furman, K. Göbel, R. Garg, A. Gawlik-Ramięga, S. Gilardoni, I. F. Gonçalves, E. González-Romero, C. Guerrero, H. Harada, S. Heinitz, D. G. Jenkins, E. Jericha, F. Käppeler†, G. Kaur, Y. Kadi, A. Kimura, N. Kivel, M. Kokkoris, Y. Kopatch, M. Krtička, D. Kurtulgil, I. Ladarescu, C. Lederer-Woods, H. Leeb, J. Lerendegui-Marco, S. Lo Meo, S. J. Lonsdale, D. Macina, A. Manna, T. Martínez, A. Masi, C. Massimi, P. Mastinu, M. Mastromarco, F. Matteucci, E. A. Maugeri, A. Mazzone, A. Mengoni, V. Michalopoulou, P. M. Milazzo, F. Mingrone, A. Musumarra, R. Nolte, F. Ogállar, N. Patronis, A. Pavlik, J. Perkowski, L. Piersanti, I. Porras, J. Praena, J. M. Quesada, D. Radeck, D. Ramos-Doval, T. Rauscher, R. Reifarth, D. Rochman, C. Rubbia, M. Sabaté-Gilarte, A. Saxena, D. Schumann, A. G. Smith, N. V. Sosnin, A. Stamatopoulos, G. Tagliente, J. L. Tain, T. Talip, A. Tarifeño-Saldivia, L. Tassan-Got, P. Torres-Sánchez, A. Tsinganis, J. Ulrich, S. Urlass, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, P. J. Woods, T. Wright, and P. Žugec

Subjects
General Medicine
Abstract

The neutron capture cross section of 241Am is an important quantity for nuclear energy production and fuel cycle scenarios. Several measurements have been performed in recent years with the aim to reduce existing uncertainties in evaluated data. Two previous measurements, performed at the 185 m flight-path station EAR1 of the neutron time-of-flight facility n_TOF at CERN, have permitted to substantially extend the resolved resonance region, but suffered in the near-thermal energy range from the unfavorable signal-to-background ratio resulting from the combination of the high radioactivity of 241Am and the rather low thermal neutron flux. The here presented 241Am(n,γ) measurement, performed with C6D6 liquid scintillator gamma detectors at the 20 m flight-path station EAR2 of the n_TOF facility, took advantage of the much higher neutron flux. The current status of the analysis of the data, focussed on the low-energy region, will be described here.

Published
2023

22. The Stellar 72Ge(n, γ) Cross Section for weak s-process: A First Measurement at n_TOF

Author

M. Dietz, C. Lederer-Woods, A. Tattersall, U. Battino, F. Gunsing, S. Heinitz, J. Lerendegui-Marco, M. Krtička, R. Reifarth, S. Valenta, O. Aberle, S. Amaducci, J. Andrzejewski, L. Audouin, M. Bacak, J. Balibrea, M. Barbagallo, F. Bečvář, E. Berthoumieux, J. Billowes, D. Bosnar, A. Brown, M. Caamaño, F. Calviño, M. Calviani, D. Cano-Ott, R. Cardella, A. Casanovas, F. Cerutti, Y. H. Chen, E. Chiaveri, N. Colonna, G. Cortés, M. A. Cortés-Giraldo, L. Cosentino, L. A. Damone, M. Diakaki, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, B. Fernández-Domínguez, A. Ferrari, P. Ferreira, P. Finocchiaro, K. Göbel, A. R. García, A. Gawlik-Ramie˛ga, S. Gilardoni, T. Glodariu†, I. F. Gonçalves, E. González-Romero, E. Griesmayer, C. Guerrero, H. Harada, J. Heyse, D. G. Jenkins, E. Jericha, F. Käppeler†, Y. Kadi, D. Kahl, A. Kalamara, P. Kavrigin, A. Kimura, N. Kivel, M. Kokkoris, D. Kurtulgil, E. Leal-Cidoncha, H. Leeb, S. Lo Meo, S. J. Lonsdale, D. Macina, A. Manna, J. Marganiec, T. Martínez, A. Masi, C. Massimi, P. Mastinu, M. Mastromarco, E. A. Maugeri, A. Mazzone, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, A. Musumarra, A. Negret, R. Nolte, A. Oprea, N. Patronis, A. Pavlik, J. Perkowski, I. Porras, J. Praena, J. M. Quesada, D. Radeck, T. Rauscher, C. Rubbia, J. A. Ryan, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, D. Schumann, A. G. Smith, N. V. Sosnin, A. Stamatopoulos, G. Tagliente, J. L. Tain, A. Tarifeño-Saldivia, L. Tassan-Got, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, S. Warren, C. Weiss, P. J. Woods, T. Wright, and P. Žugec

Subjects
General Medicine
Abstract

The slow neutron capture process (s-process) is responsible for producing about half of the elemental abundances heavier than iron in the universe. Neutron capture cross sections on stable isotopes are a key nuclear physics input for s-process studies. The 72Ge(n, γ) Maxwellian-Averaged Cross Section (MACS) has an important influence on the production of isotopes between Ge and Zr in the weak s-process in massive stars and so far only theoretical estimations are available. An experiment was carried out at the neutron time-of-flight facility n_TOF at CERN to measure the 72Ge(n, γ) reaction for the first time at stellar neutron energies. The capture measurement was performed using an enriched 72GeO2 sample at a flight path length of 184 m, which provided high neutron energy resolution. The prompt gamma rays produced after neutron capture were detected with a set of liquid scintillation detectors (C6D6). The neutron capture yield is derived from the counting spectra taking into account the neutron flux and the gamma-ray detection efficiency using the Pulse Height Weighting Technique. Over 70 new neutron resonances were identified, providing an improved resolved reaction cross section to calculate experimental MACS values for the first time. The experiment, data analysis and the new MACS results will be presented including their impact on stellar nucleosynthesis, which was investigated using the post-processing nucleosynthesis code mppnp for a 25 solar mass model.

Published
2023

23. Detector set up for the measurements of the neutron-induced fission cross section of 235U relative to n-p scattering up to 150 MeV at CERN-n_TOF

Author

E. Pirovano, A. Manna, N. Colonna, P. Console Camprini, L. Cosentino, M. Dietz, Q. Ducasse, P. Finocchiaro, C. Massimi, A. Mengoni, R. Nolte, D. Radeck, L. Tassan-Got, N. Terranova, A. Ventura, O. Aberle, V. Alcayne, S. Amaducci, J. Andrzejewski, L. Audouin, V. Babiano-Suarez, M. Bacak, M. Barbagallo, S. Bennett, E. Berthoumieux, J. Billowes, D. Bosnar, A. Brown, M. Busso, M. Caamaño, L. Caballero-Ontanaya, F. Calviño, M. Calviani, D. Cano-Ott, A. Casanovas, F. Cerutti, E. Chiaveri, G. Cortés, M. A. Cortés-Giraldo, S. Cristallo, L. A. Damone, P. J. Davies, M. Diakaki, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, Z. Eleme, B. Fernández-Domínguez, A. Ferrari, K. Göbel, R. Garg, A. Gawlik-Ramie˛ga, S. Gilardoni, I. F. Gonçalves, E. González-Romero, C. Guerrero, F. Gunsing, H. Harada, S. Heinitz, J. Heyse, D. G. Jenkins, A. Junghans, F. Käppeler†, Y. Kadi, A. Kimura, I. Knapová, M. Kokkoris, M. Krtička, D. Kurtulgil, I. Ladarescu, C. Lederer-Woods, H. Leeb, J. Lerendegui-Marco, S. J. Lonsdale, D. Macina, T. Martínez, A. Masi, P. Mastinu, M. Mastromarco, E. A. Maugeri, A. Mazzone, E. Mendoza, V. Michalopoulou, P. M. Milazzo, F. Mingrone, J. Moreno-Soto, A. Musumarra, A. Negret, F. Ogállar, A. Oprea, N. Patronis, A. Pavlik, J. Perkowski, L. Piersanti, C. Petrone, I. Porras, J. Praena, J. M. Quesada, D. Ramos-Doval, T. Rauscher, R. Reifarth, D. Rochman, C. Rubbia, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, D. Schumann, A. Sekhar, A. G. Smith, N. V. Sosnin, P. Sprung, A. Stamatopoulos, G. Tagliente, J. L. Tain, A. Tarifeño-Saldivia, Th. Thomas, P. Torres-Sánchez, A. Tsinganis, J. Ulrich, S. Urlass, S. Valenta, G. Vannini, V. Variale, P. Vaz, D. Vescovi, V. Vlachoudis, R. Vlastou, A. Wallner, P. J. Woods, T. Wright, and P. Žugec

Subjects
General Medicine
Abstract

A new measurement of the 235U(n,f) fission cross section was carried out at n_TOF. The experiment covered the neutron energy range from 10 MeV up to 500 MeV, and it used the 1H(n,n) cross section as normalization for the neutron fluence measurement. In this contribution, the measurements and the characterization of the detectors covering the incident energy range up to 150 MeV are discussed.

Published
2023

24. Characterization of a detector setup for the measurement of the 235U(n,f) cross section relative to n-p scattering up to 500 MeV at the n_TOF facility at CERN

Author

A. Manna, E. Pirovano, N. Colonna, D. Castelluccio, P. Console Camprini, L. Cosentino, M. Dietz, Q. Ducasse, P. Finocchiaro, C. Le Naour, C. Massimi, A. Mengoni, R. Nolte, L. Tassan-Got, N. Terranova, G. Vannini, A. Ventura, O. Aberle, V. Alcayne, S. Amaducci, J. Andrzejewski, L. Audouin, V. Babiano-Suarez, M. Bacak, M. Barbagallo, S. Bennett, E. Berthoumieux, J. Billowes, D. Bosnar, A. Brown, M. Busso, M. Caamaño, L. Caballero-Ontanaya, F. Calviño, M. Calviani, D. Cano-Ott, A. Casanovas, F. Cerutti, E. Chiaveri, G. Cortés, M. A. Cortés-Giraldo, S. Cristallo, L. A. Damone, P. J. Davies, M. Diakaki, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, Z. Eleme, B. Fernández-Domínguez, A. Ferrari, K. Göbel, R. Garg, R. A. Gawlik-Ramiega, S. Gilardoni, I. F. Gonçalves, E. González-Romero, C. Guerrero, F. Gunsing, H. Harada, S. Heinitz, J. Heyse, D. G. Jenkins, A. Junghans, F. Käppeler, Y. Kadi, A. Kimura, I. Knapová, M. Kokkoris, M. Krtička, D. Kurtulgil, I. Ladarescu, C. Lederer-Woods, H. Leeb, J. Lerendegui-Marco, S. J. Lonsdale, D. Macina, T. Martínez, A. Masi, P. Mastinu, M. Mastromarco, E. A. Maugeri, A. Mazzone, E. Mendoza, V. Michalopoulou, P. M. Milazzo, F. Mingrone, J. Moreno-Soto, A. Musumarra, A. Negret, F. Ogállar, A. Oprea, N. Patronis, A. Pavlik, J. Perkowski, L. Piersanti, C. Petrone, I. Porras, J. Praena, J. M. Quesada, D. Ramos-Doval, T. Rauscher, R. Reifarth, D. Rochman, C. Rubbia, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, D. Schumann, A. Sekhar, A. G. Smith, N. V. Sosnin, P. Sprung, A. Stamatopoulos, G. Tagliente, J. L. Tain, A. Tarifeño-Saldivia, Th. Thomas, P. Torres-Sánchez, A. Tsinganis, J. Ulrich, S. Urlass, S. Valenta, V. Variale, P. Vaz, D. Vescovi, V. Vlachoudis, R. Vlastou, A. Wallner, P. J. Woods, T. Wright, and P. Žugec

Subjects
General Medicine
Abstract

The measurement of the 235U(n,f) reaction cross section in the neutron energy region 10 MeV to 500 MeV was carried out at the CERN n_TOF facility. The experimental campaign, completed in 2018, provided precise and accurate data on the fission reaction relative to neutron-proton elastic scattering. A description and characterization of the used setup for the simultaneous measurement of fission fragments and neutron flux is reported here.

Published
2023

25. Fission-fragment yields measured in Coulomb-induced fission of 234,235,236,238U and 237,238Np with the R3B/SOFIA setup

Author

A. Chatillon, G. Boutoux, T. Gorbinet, L. Grente, J.-F. Martin, E. Pellereau, J. Taieb, H. Alvarez-Pol, L. Audouin, Y. Ayyad, G. Bélier, J. Benlliure, M. Caamaño, E. Casarejos, D. Cortina-Gil, A. Ebran, F. Farget, B. Fernández-Domínguez, A. Heinz, H. T. Johansson, B. Jurado, A. Kelić-Heil, N. Kurz, B. Laurent, B. Loeher, C. Nociforo, C. Paradela, S. Pietri, A. Prochazka, D. Ramos, J. L. Rodríguez-Sànchez, C. Rodriguez, D. Rossi, H. Simon, L. Tassan-Got, H. Toernqvist, J. Vargas, B. Voss, and H. Weick

Subjects
General Medicine
Abstract

Low energy fission of 234,235,236,238U and 237,238Np radioactive beams, provided by the GSI/FRS facility, has been studied using the R3B/SOFIA setup. The latter allows, on an event-by-event basis, to simultaneously identify, in terms of their mass and atomic numbers, the fissioning nucleus in coincidence with both fission fragments after prompt-neutron emission. This presentation reports on new results on elemental, isobaric and isotopic yields.

Published
2023

26. Ground-state properties of super-heavy hydrogen-7

Author

Marine Vandebrouck, Riccardo Raabe, A. M. Moro, Gwen Grinyer, D. Cortina, David Pérez-Loureiro, Bertrand Jacquot, M. Caamaño, Herve Savajols, S. Sambi, C. Rodriguez-Tajes, Julien Gibelin, T. Roger, D. Ramos, J. Benlliure, J. Pancin, S. Bagchi, Naoyu Itagaki, F. Farget, B. Fernández-Domínguez, Benjamim Pietras, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Proton, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear matter, 7. Clean energy, Resonance (particle physics), Nuclear physics, Deuterium, Nuclear force, Neutron, Nucleon, Ground state, Nuclear Experiment
Abstract

The properties of nuclei with extreme neutron-to-proton ratios, far from those naturally occurring on Earth, are key to understand nuclear forces and how nucleons hold together to form nuclei. $^7$H, with six neutrons and a single proton, is the nuclear system with the most unbalanced neutron-to-proton ratio known so far. However, its sheer existence and properties are still a challenge for experimental efforts and theoretical models. Here we report the formation of $^7$H as a resonance, detected with independent observables, and the first measurement of the structure of its ground state. The resonance is found at $\sim$0.7 MeV above the $^3$H+4n mass, with a narrow width of $\sim$0.2 MeV and a $1/2^+$ spin and parity. Together, these properties picture $^7$H as a $^3$H core surrounded by an extended four-neutron halo, with a unique four-neutron decay and a relatively long half-life thanks to neutron pairing; a prime example of new phenomena occurring in the most pure-neutron nuclear matter we can access in the laboratory.

Published
2021

27. Measurement of the Ge76(n,γ) cross section at the n_TOF facility at CERN

Author

M. A. Cortés-Giraldo, V. Bécares, A. Pavlik, C. Domingo-Pardo, D. Cano-Ott, F. Cerutti, M. Diakaki, M. Sabaté-Gilarte, Y. Kadi, A. Gawlik-Ramięga, G. Vannini, F. Bečvář, M. Caamaño, N. Colonna, C. Weiss, A. Oprea, Rugard Dressler, C. Wolf, E. Mendoza, G. Cortes, I. Knapova, S. Valenta, P. Vaz, A. Tsinganis, Peter Schillebeeckx, E. Leal-Cidoncha, Marco Calviani, Y. H. Chen, A. G. Smith, M. Mirea, Javier Praena, S. Lo Meo, Vasilis Vlachoudis, D. Bosnar, Claudia Lederer-Woods, Philip Woods, V. Khryachkov, L. Cosentino, D. G. Jenkins, P. M. Milazzo, O. Aberle, A. Kimura, F. Calviño, H. Leeb, J. Perkowski, P. V. Sedyshev, M. Bacak, R. Cardella, K. Rajeev, A. Musumarra, J. I. Porras, T. Glodariu, Thomas Rauscher, B. Fernández-Domínguez, F. Käppeler, Roberto Losito, Francesca Matteucci, S. Montesano, D. M. Castelluccio, S. Warren, Tanja Heftrich, Kathrin Göbel, V. Furman, T. J. Wright, G. Tagliente, E. Chiaveri, C. Rubbia, A. Stamatopoulos, A. Tattersall, A. Riego-Perez, P. F. Mastinu, V. Variale, Tatsuya Katabuchi, A. Ventura, Pedro G. Ferreira, Mario Weigand, S. Heinitz, J. Andrzejewski, A. Casanovas, D. Macina, Jan Heyse, Carlos Guerrero, J. L. Tain, P. C. Rout, Petar Žugec, Niko Kivel, F. Gunsing, E. Jericha, Emilio Andrea Maugeri, S. Barros, F. Mingrone, Paolo Finocchiaro, M. Krtička, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Dorothea Schumann, Cristian Massimi, J. Lerendegui-Marco, P. Kavrigin, J. A. Ryan, T. Martinez, Rene Reifarth, L. Audouin, I. F. Gonçalves, M. Kokkoris, E. González-Romero, Stefan Schmidt, Ralf Nolte, A. Goverdovski, J. M. Quesada, L. Tassan-Got, A. Mengoni, E. Griesmayer, U. Battino, R. Vlastou, L. A. Damone, E. Berthoumieux, N. Patronis, A. K. Saxena, Arnaud Ferrari, V. Ketlerov, J. Billowes, I. Duran, A. R. García, M. Brugger, C. Beinrucker, E. Dupont, M. Dietz, M. Mastromarco, Massimo Barbagallo, Anton Wallner, J. Balibrea, and Hideo Harada

Subjects
Croatian, Physics, Czech, 010308 nuclear & particles physics, European research, 0103 physical sciences, language, Library science, 010306 general physics, 01 natural sciences, language.human_language
Abstract

This work was supported by the Austrian Science Fund FWF (J3503), the Adolf Messer Foundation (Germany), the UK Science and Facilities Council (ST/M006085/1), and the European Research Council ERC-2015-StG No. 677497. We also acknowledge support of Narodowe Centrum Nauki (NCN) under the grant (UMO-2016/22/M/ST2/00183) and University of Lodz under the grant (9/IDUB/MLOD/2021), MEYS of the Czech Republic, the Charles University project UNCE/SCI/013, and the Croatian Science Foundation under the project IP-2018-01-8570.

Published
2021

28. Fission-fragment yields and prompt-neutron multiplicity for Coulomb-induced fission of U234,235 and Np237,238

Author

S. Pietri, J. Benlliure, A. Chatillon, G. Boutoux, A. Kelic-Heil, D. M. Rossi, B. Jurado, F. Farget, A. Prochazka, C. Nociforo, J. F. Martin, E. Casarejos, Bernd Voss, B. Laurent, H. Alvarez-Pol, M. Caamaño, T. Gorbinet, Y. Ayyad, G. Belier, L. Grente, J. Vargas, D. Cortina-Gil, E. Pellereau, C. Paradela, A. Ebran, B. Fernández-Domínguez, L. Tassan-Got, Helmut Weick, L. Audouin, Andreas Martin Heinz, Håkan Johansson, N. Kurz, J. L. Rodriguez-Sanchez, J. Taieb, and Herbert A. Simon

Subjects
Physics, Proton, 010308 nuclear & particles physics, Fission, Nuclear Theory, 01 natural sciences, Nuclear physics, medicine.anatomical_structure, Prompt neutron, 0103 physical sciences, medicine, Neutron, Atomic number, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, Nucleus, Excitation
Abstract

Low-energy fission of and radioactive beams, provided by the Fragment Separator (FRS) of the GSI Helmholtzzentrum fur Schwerionenforschung facility (GSI), has been studied using the Reactions with Relativistic Radioactive Beams / Studies on Fission with Aladin (R3B/SOFIA) setup. The latter allows us, on an event-by-event basis, to simultaneously identify, in terms of their mass and atomic numbers, the fissioning nucleus in coincidence with both fission fragments after prompt-neutron emission. This article reports new results on elemental, isotonic, isobaric, and isotopic yields. Moreover, the high accuracy of our data allowed us to study in detail proton even-odd staggering, from elemental yields; neutron excess, from isotopic yields; and total prompt-neutron multiplicity, from the difference of masses of the fissioning nucleus and fission fragments. These results are then compared to previous experimental data in order to probe how these fission observables change as function of the excitation energy and atomic and neutron numbers of the compound nucleus.

Published
2021

29. Destruction of the cosmic γ -ray emitter Al26 in massive stars: Study of the key Al26(n,α) reaction

Author

M. Caamaño, A. Gawlik, Thomas Rauscher, M. Bacak, T. Davinson, A. Pavlik, C. Domingo-Pardo, E. González-Romero, M. Sabaté-Gilarte, T. Glodariu, M. Mastromarco, D. Cano-Ott, G. Cortes, G. Tagliente, M. Diakaki, Alexandru Negret, C. Weiss, B. Fernández-Domínguez, F. Käppeler, Javier Praena, S. Lo Meo, A. R. García, S. Heinitz, Rugard Dressler, Massimo Barbagallo, A. Oprea, D. Bosnar, Emilio Andrea Maugeri, A. Kimura, A. Casanovas, N. Colonna, M. Kokkoris, J. Marganiec, N. V. Sosnin, M. A. Cortés-Giraldo, Anton Wallner, Rene Reifarth, J. Andrzejewski, A. Mengoni, I. Duran, L. Cosentino, A. Musumarra, Y. H. Chen, J. Balibrea, P. Vaz, A. Manna, Annamaria Mazzone, Petar Žugec, P. J. Woods, Vasilis Vlachoudis, N. Patronis, D. Macina, Carlos Guerrero, A. K. Saxena, A. Stamatopoulos, Arnaud Ferrari, F. Cerutti, J. Billowes, F. J. Ferrer, P. Kavrigin, Ralf Nolte, Hideo Harada, J. M. Quesada, Simone Gilardoni, E. Griesmayer, L. A. Damone, A. Masi, D. G. Jenkins, L. Tassan-Got, R. Cardella, Ariel Tarifeño-Saldivia, S. J. Lonsdale, M. Krtička, S. Warren, J. Lerendegui-Marco, V. Variale, S. Amaducci, Sergio Cristallo, Claudia Lederer-Woods, T. Martinez, Y. Kadi, E. Dupont, I. F. Gonçalves, Kathrin Göbel, Deniz Kurtulgil, P. V. Sedyshev, A. Ventura, S. Valenta, Marco Calviani, R. Vlastou, D. Radeck, A. G. Smith, E. Chiaveri, Ignacio Porras, E. Berthoumieux, P. F. Mastinu, Jan Heyse, A. Kalamara, V. Furman, T. J. Wright, C. Paradela, J. L. Tain, L. Audouin, Niko Kivel, O. Aberle, F. Calviño, H. Leeb, J. Perkowski, Pedro G. Ferreira, F. Gunsing, Cristian Massimi, C. Rubbia, E. Jericha, Paolo Finocchiaro, Dorothea Schumann, J. A. Ryan, A. S. Brown, P. M. Milazzo, F. Bečvář, E. Mendoza, Peter Schillebeeckx, A. Estrade, F. Mingrone, D. Kahl, G. Vannini, and E. Leal-Cidoncha

Subjects
Physics, Stars, COSMIC cancer database, 010308 nuclear & particles physics, European research, 0103 physical sciences, Key (cryptography), Astronomy, Cost action, 010303 astronomy & astrophysics, 01 natural sciences
Abstract

We thank P. Black (University of Edinburgh) for support in design and construction of the detection system and P. Morrall (Daresbury Laboratory) for production of the B and LiF reference samples. This Letter was supported by the Austrian Science Fund (FWF), Project No. J3503, by JRCIRMM through the EUFRAT Program, by the U.K. Science and Technologies Facilities Council (STFC), Projects No. ST/L005824/1 and No. ST/M006085/1, the European Research Council ERC-2015-STG Grant No. 677497, and the Cost Action "ChETEC" (Grant No. CA16117).

Published
2021

30. Proton 3D tracking and emission time from a short-lived isomer with ACTAR TPC

Author

J. Giovinazzo, T. Roger, B. Blank, D. Rudolph, H. Alvarez-Pol, A. Arokiaraj, P. Ascher, M. Camaaño-Fresco, L. Caceres, D.M. Cox, B. Fernández-Domínguez, J. Lois-Fuentes, M. Gerbaux, S. Grévy, G.F. Grinyer, O. Kamalou, B. Mauss, A. Mentana, A. Ortega Moral, J. Pancin, J. Pibernat, J. Piot, O. Sorlin, C. Stodel, J.-C. Thomas, M. Versteegen, Laboratoire de Physique des Deux Infinis Bordeaux (LP2I - Bordeaux), Université de Bordeaux (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
p: tracks, data analysis method, Nuclear and High Energy Physics, track data analysis, Short-lived decays, ACTAR TPC, Proton radioactivity, tracks: length, Track reconstruction, time projection chamber, nickel: nuclide, efficiency, radioactivity, decay: time, branching ratio, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Instrumentation
Abstract

International audience; An experiment was conducted at the GANIL/LISE3 facility to produce the 10+ isomer of 54Ni and measure its proton radioactivity decay branches. The proton detection was achieved with the ACTAR TPC device that enabled the separation of the small signal of the emitted proton from the large signal of the implanted ion, while the decay half-life is of the order of 150 ns. From the measured data, the emitted proton track length and the decay time of the ion can be extracted simultaneously. The full proton radioactivity pattern could be established, with two emission branches and their relative branching ratio. Data processing and analysis that allowed to identify and separate the ion and the proton signals in order to reconstruct the particles trajectories and decay time are detailed. The evaluation of the detection efficiency for the proton radioactivity branches based on a full simulation is described.

Published
2022

31. 4D-imaging of drip-line radioactivity by detecting proton emission from Ni-54m pictured with ACTAR TPC

Author

M. Versteegen, J. Giovinazzo, Dirk Rudolph, O. Sorlin, P. Ascher, T. Roger, A. Arokia Raj, B. Fernández-Domínguez, J. Piot, Daniel Cox, M. Caamaño-Fresco, H. Alvarez-Pol, O. Kamalou, J. C. Thomas, B. Mauss, J. Pancin, M. Gerbaux, L. Cáceres, C. Stodel, J. Lois-Fuentes, J. Pibernat, B. Blank, S. Grévy, A. Mentana, B. A. Brown, G. F. Grinyer, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Proton, Physics::Instrumentation and Detectors, Science, Nuclear Theory, ACTIVE TARGET, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Article, General Biochemistry, Genetics and Molecular Biology, Techniques and instrumentation, Nuclear physics, Quantum state, 0103 physical sciences, Quantum system, Experimental nuclear physics, Proton emission, 010306 general physics, Wave function, Nuclear Experiment, Quantum tunnelling, Physics, Multidisciplinary, Science & Technology, 010308 nuclear & particles physics, Nuclear shell model, General Chemistry, NUCLEAR-PHYSICS, Multidisciplinary Sciences, Theoretical nuclear physics, Atomic nucleus, SHELL-MODEL, Physics::Accelerator Physics, Science & Technology - Other Topics, SYSTEM
Abstract

Proton radioactivity was discovered exactly 50 years ago. First, this nuclear decay mode sets the limit of existence on the nuclear landscape on the neutron-deficient side. Second, it comprises fundamental aspects of both quantum tunnelling as well as the coupling of (quasi)bound quantum states with the continuum in mesoscopic systems such as the atomic nucleus. Theoretical approaches can start either from bound-state nuclear shell-model theory or from resonance scattering. Thus, proton-radioactivity guides merging these types of theoretical approaches, which is of broader relevance for any few-body quantum system. Here, we report experimental measurements of proton-emission branches from an isomeric state in 54mNi, which were visualized in four dimensions in a newly developed detector. We show that these decays, which carry an unusually high angular momentum, ℓ = 5 and ℓ = 7, respectively, can be approximated theoretically with a potential model for the proton barrier penetration and a shell-model calculation for the overlap of the initial and final wave functions., Proton radioactivity is useful for studying nuclear structure. Here the authors report two proton emission branches from the 10+ state isomer of 54mNi by using a time projection chamber.

Published
2021

32. Measurement of the 72Ge(n,γ) cross section over a wide neutron energy range at the CERN n_TOF facility

Author

Javier Praena, S. Lo Meo, J. Lerendegui-Marco, S. Amaducci, F. Mingrone, A. Kalamara, I. F. Gonçalves, Simone Gilardoni, N. Colonna, R. Cardella, S. Heinitz, A. Stamatopoulos, F. Cerutti, R. Vlastou, D. Radeck, D. Cano-Ott, M. Diakaki, O. Aberle, E. Berthoumieux, U. Battino, A. Pavlik, G. Tagliente, S. Valenta, G. Vannini, C. Domingo-Pardo, Ignacio Porras, Y. H. Chen, Marco Calviani, S. Warren, M. Sabaté-Gilarte, M. Caamaño, A. Ventura, A. G. Smith, F. Bečvář, D. Macina, Carlos Guerrero, N. V. Sosnin, A. Oprea, V. Variale, A. S. Brown, E. Mendoza, Annamaria Mazzone, Petar Žugec, J. Marganiec, Philip Woods, N. Patronis, Rene Reifarth, A. K. Saxena, G. Cortes, L. Audouin, Peter Schillebeeckx, Arnaud Ferrari, M. Bacak, D. Bosnar, P. M. Milazzo, Alexandru Negret, J. Billowes, Cortés-Giraldo, J. M. Quesada, L. Tassan-Got, Pedro G. Ferreira, A. Casanovas, B. Fernández-Domínguez, M. Krtička, Ariel Tarifeño-Saldivia, S. J. Lonsdale, F. Käppeler, T. Glodariu, V. Furman, T. J. Wright, D. Kahl, J. L. Tain, Hideo Harada, Emilio Andrea Maugeri, M. Mastromarco, T. Martinez, Niko Kivel, M. Kokkoris, Kathrin Göbel, Claudia Lederer-Woods, J. Andrzejewski, I. Duran, Rugard Dressler, Y. Kadi, Massimo Barbagallo, E. Jericha, L. Cosentino, Anton Wallner, Paolo Finocchiaro, E. Chiaveri, C. Rubbia, P. F. Mastinu, Dorothea Schumann, J. Balibrea, J. A. Ryan, Jan Heyse, Vasilis Vlachoudis, Deniz Kurtulgil, P. V. Sedyshev, F. Calviño, H. Leeb, J. Perkowski, F. Gunsing, Cristian Massimi, A. Masi, D. G. Jenkins, A. Manna, A. Tattersall, P. Kavrigin, Ralf Nolte, E. Griesmayer, L. A. Damone, C. Weiss, A. Musumarra, A. Mengoni, M. Dietz, A. R. García, A. Kimura, E. Leal-Cidoncha, E. Dupont, A. Gawlik, Thomas Rauscher, E. González-Romero, and P. Vaz

Subjects
Physics, Large Hadron Collider, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Liquid scintillation counting, 7. Clean energy, 01 natural sciences, Resonance (particle physics), Neutron temperature, Nuclear physics, Cross section (physics), Beamline, 13. Climate action, 0103 physical sciences, Nuclear astrophysics, Neutron, Nuclear Experiment, 010306 general physics
Abstract

The Ge72(n,γ) cross section was measured for neutron energies up to 300keV at the neutron time-of-flight facility n_TOF (CERN), Geneva, for the first time covering energies relevant to heavy-element synthesis in stars. The measurement was performed at the high-resolution beamline EAR-1, using an isotopically enriched GeO272 sample. The prompt capture γ rays were detected with four liquid scintillation detectors, optimized for low neutron sensitivity. We determined resonance capture kernels up to a neutron energy of 43keV, and averaged cross sections from 43 to 300keV. Maxwellian-averaged cross section values were calculated from kT=5 to 100keV, with uncertainties between 3.2% and 7.1%. The new results significantly reduce uncertainties of abundances produced in the slow neutron capture process in massive stars.

Published
2021

33. Experimental Study of $^{4}n$ by Directly Detecting the Decay Neutrons

Author

Atsumi Saito, Yohei Shimizu, H. Törnqvist, B. Monteagudo, T. Isobe, M. Caamaño, H. Scheit, S. Kiyotake, J. Tscheuschner, M. L. Cortés, F. M. Marqués, N. Fukuda, N. A. Orr, J. M. Gheller, A. Gillibert, A. Matta, K. Yoneda, L. Stuhl, Z. Elekes, I. Kuti, V. Wagner, M. Miwa, Z. Halász, A. Obertelli, S. Kim, A. Revel, L. Zanetti, N. L. Achouri, S. Takeuchi, F. Dufter, C. A. Douma, S. Masuoka, Stefanos Paschalis, R. Gernhäuser, S. Chen, Nobuyuki Chiga, S. Storck, T. Shimada, M.N. Harakeh, P. Koseoglou, T. Harada, B. Yang, M. Matsumoto, H. Takeda, D. S. Ahn, Yuya Kubota, H. Yamada, Yasuhiro Togano, A. Hirayama, Y. Yasuda, T. Fujino, D. M. Rossi, Nasser Kalantar-Nayestanaki, J. Tanaka, M. Böhmer, N. Inabe, Didier Beaumel, S. Park, Thomas Aumann, H. Baba, Tomohiro Uesaka, F. Schindler, J. Feng, Zaihong Yang, I. Murray, Julien Gibelin, K. Boretzky, S. W. Huang, B. Fernández-Domínguez, S. Reichert, Takashi Nakamura, Yu-xin Liu, K. Wimmer, Yukie Maeda, L. Yang, H. Sato, E. Tronchin, P. Doornenbal, Dmytro Symochko, D. Cortina, J. Kahlbow, S. Shimoura, H. Suzuki, Hideaki Otsu, M. Potlog, P. J. Li, J. Mayer, H. Miki, Masaki Sasano, Toshio Kobayashi, Z. Ge, D. Kim, Juzo Zenihiro, T. Tomai, I. Stefan, M. Parlog, H. Simon, V. Panin, Igor Gašparić, C. Lehr, Yosuke Kondo, C. Lenain, U. Forsberg, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Research unit Nuclear & Hadron Physics, and Nuclear Energy

Subjects
Nuclear structure and force, tetraneutron, direct reactions, radioactive beams, Physics, Nuclear physics, 010308 nuclear & particles physics, 0103 physical sciences, Tetraneutron, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, 3. Good health
Abstract

The tetraneutron has attracted the attention of nuclear physicists during the past decades, but there is still no unambiguous confirmation of its existence or non-existence. A new experiment based on $$^{8}$$ He(p, 2p) $$^{7}$$ H{t+ $$^{4}n$$ } reaction, with direct detection of the four neutrons, has been carried out at RIBF, which can hopefully help to draw a definite conclusion on the tetraneutron system.

Published
2021

34. Imaging neutron capture cross sections: i-TED proof-of-concept and future prospects based on Machine-Learning techniques

Author

Ignacio Porras, D. Macina, F. Ogállar, G. Cortes, G. Tagliente, A. Oprea, N. Patronis, A. K. Saxena, Claudia Lederer-Woods, Deniz Kurtulgil, Arnaud Ferrari, L. Audouin, Carlos Guerrero, S. Heinitz, R. Garg, Alberto Mengoni, I. Ladarescu, Rugard Dressler, C. Petrone, P. Torres-Sánchez, Hideo Harada, T. Rodríguez-González, J. Lerendegui-Marco, M. Sabaté-Gilarte, L. Persanti, J. Balibrea-Correa, A. Casanovas, J. Billowes, A. Tsinganis, V. Babiano-Suarez, S. Amaducci, S. Bennett, N. V. Sosnin, O. Aberle, Nicola Colonna, Luis Caballero, M. A. Millán-Callado, Simone Gilardoni, I. F. Gonçalves, A. Stamatopoulos, V. Variale, A. Kimura, Dimitri Rochman, Arnd R. Junghans, Annamaria Mazzone, L. Cosentino, A. Masi, Petar Žugec, M. Mastromarco, D. Bosnar, D. G. Jenkins, Z. Eleme, E. Dupont, Emilio Andrea Maugeri, D. Cano-Ott, P. Sprung, E. Mendoza, Massimo Barbagallo, Y. Kadi, Anton Wallner, Kathrin Göbel, M. Kokkoris, A. Sekhar, M. Diakaki, Y. Kopatch, I. Duran, A. Manna, A. Gawlik, Thomas Rauscher, Jan Heyse, D. Ramos-Doval, Diego Vescovi, Maurizio Busso, J. Andrzejewski, J. Moreno-Soto, M. Bacak, M. A. Cortés-Giraldo, Rene Reifarth, F. Mingrone, G. Vannini, D. Calvo, Paolo Finocchiaro, V. Vlachoudis, M. Krtička, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Dorothea Schumann, I. Knapova, J. M. Quesada, L. Tassan-Got, Alexandru Negret, S. Valenta, T. Martinez, E. Pirovano, B. Fernández-Domínguez, A. S. Brown, P. Vaz, Sergio Cristallo, Marco Calviani, E. González-Romero, F. Käppeler, A. G. Smith, D. Real, L. A. Damone, M. Caamaño, Alberto Ventura, M. Dietz, V. Alcayne, F. Calviño, H. Leeb, A. Musumarra, Philip Woods, A. Pavlik, E. Chiaveri, J. Perkowski, P. F. Mastinu, P. M. Milazzo, C. Domingo-Pardo, F. Cerutti, J. L. Tain, F. Gunsing, Th. Thomas, Cristian Massimi, S. Urlass, P. J. Davies, R. Vlastou, V. Michalopoulou, J. Ulrich, Peter Schillebeeckx, E. Berthoumieux, C. Rubbia, Q. Ducasse, Javier Praena, V. Furman, T. J. Wright, ITA, GBR, FRA, DEU, ESP, AUS, AUT, BEL, HRV, GRC, IND, POL, CZE, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Consejo Superior de Investigaciones Científicas (España), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Babiano-Su??rez, V., Lerendegui-Marco, J., Balibrea-Correa, J., Caballero, L., Calvo, D., Ladarescu, I., Real, D., Domingo-Pardo, C., Calvi??o, F., Casanovas, A., Tarife??o-Saldivia, A., Alcayne, V., Guerrero, C., Mill??n-Callado, M. A., Rodr??guez-Gonz??lez, T., Barbagallo, M., Aberle, O., Amaducci, S., Andrzejewski, J., Audouin, L., Bacak, M., Bennett, S., Berthoumieux, E., Billowes, J., Bosnar, D., Brown, A., Busso, M., Caama??o, M., Calviani, M., Cano-Ott, D., Cerutti, F., Chiaveri, E., Colonna, N., Cort??s, G., Cort??s-Giraldo, M. A., Cosentino, L., Cristallo, S., Damone, L. A., Davies, P. J., Diakaki, M., Dietz, M., Dressler, R., Ducasse, Q., Dupont, E., Dur??n, I., Eleme, Z., Fern??ndez-Dom??nguez, B., Ferrari, A., Finocchiaro, P., Furman, V., G??bel, K., Garg, R., Gawlik, A., Gilardoni, S., Gon??alves, I. F., Gonz??lez-Romero, E., Gunsing, F., Harada, H., Heinitz, S., Heyse, J., Jenkins, D. G., Junghans, A., K??ppeler, F., Kadi, Y., Kimura, A., Knapova, I., Kokkoris, M., Kopatch, Y., Krti??ka, M., Kurtulgil, D., Lederer-Woods, C., Leeb, H., Lonsdale, S. J., Macina, D., Manna, A., Martinez, T., Masi, A., Massimi, C., Mastinu, P., Mastromarco, M., Maugeri, E. A., Mazzone, A., Mendoza, E., Mengoni, A., Michalopoulou, V., Milazzo, P. M., Mingrone, F., Moreno-Soto, J., Musumarra, A., Negret, A., Og??llar, F., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Persanti, L., Petrone, C., Pirovano, E., Porras, I., Praena, J., Quesada, J. M., Ramos-Doval, D., Rauscher, T., Reifarth, R., Rochman, D., Rubbia, C., Sabat??-Gilarte, M., Saxena, A., Schillebeeckx, P., Schumann, D., Sekhar, A., Smith, A. G., Sosnin, N. V., Sprung, P., Stamatopoulos, A., Tagliente, G., Tain, J. L., Tassan-Got, L., Thomas, Th., Torres-S??nchez, P., Tsinganis, A., Ulrich, J., Urlass, S., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vescovi, D., Vlachoudis, V., Vlastou, R., Wallner, A., Woods, P. J., Wright, T., and ugec, P.

Subjects
Astrophysics and Astronomy, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics: Instrumentation and Detectors, Astrophysics, Instrumentation and Methods for Astrophysics, Nuclear Experiment, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, Astrophysics, 01 natural sciences, 0103 physical sciences, Electronic engineering, Nuclear Physics - Experiment, Sensitivity (control systems), [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, Nuclear Experiment (nucl-ex), 010306 general physics, physics.ins-det, Nuclear Experiment, Instrumentation and Methods for Astrophysics (astro-ph.IM), Physics::Atmospheric and Oceanic Physics, Physics, Large Hadron Collider, i-TED, neutron capture, n_TOF, machine learning, 010308 nuclear & particles physics, Compton imaging, Detector, Experimental validation, Instrumentation and Detectors (physics.ins-det), Neutron capture, Physics: Instrumentation and Detectors, Proof of concept, Benchmark (computing), Instrumentation and Methods for Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics, astro-ph.IM
Abstract

Babiano-Suárez, V., et al., i-TED is an innovative detection system which exploits Compton imaging techniques to achieve a superior signal-to-background ratio in (n, γ) cross-section measurements using time-of-flight technique. This work presents the first experimental validation of the i-TED apparatus for high-resolution time-of-flight experiments and demonstrates for the first time the concept proposed for background rejection. To this aim, the Au(n, γ) and Fe(n, γ) reactions were studied at CERN n_TOF using an i-TED demonstrator based on three position-sensitive detectors. Two CD detectors were also used to benchmark the performance of i-TED. The i-TED prototype built for this study shows a factor of ∼ 3 higher detection sensitivity than state-of-the-art CD detectors in the 10 keV neutron-energy region of astrophysical interest. This paper explores also the perspectives of further enhancement in performance attainable with the final i-TED array consisting of twenty position-sensitive detectors and new analysis methodologies based on Machine-Learning techniques., This work has been carried out in the framework of a project funded by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (ERC Consolidator Grant project HYMNS, with grant agreement No. 681740). The authors acknowledge support from the Spanish Ministerio de Ciencia e Innovación under grants PID2019-104714GB-C21, FPA2017-83946-C2-1-P, FIS2015-71688-ERC, CSIC for funding PIE-201750I26, and the funding agencies of the participating institutes. We would like to thank the crew at the Electronics Laboratory of IFIC, in particular Manuel Lopez Redondo and Jorge Nácher Arándiga for their excellent and efficient work.

Published
2021

35. Radiative Neutron Capture Cross-Section Measurement of Ge Isotopes at n_TOF CERN Facility and Its Importance for Stellar Nucleosynthesis

Author

M. Bacak, A. Musumarra, P. J. Woods, T. Glodariu, N. Patronis, A. Pavlik, Roberto Losito, Rene Reifarth, Stefan Schmidt, Cortés-Giraldo, J. M. Quesada, L. Tassan-Got, Tanja Heftrich, A. Riego-Perez, S.L. Meo, A. K. Saxena, Arnaud Ferrari, C. Domingo-Pardo, L. Audouin, G. Vannini, P. C. Rout, L. Cosentino, E. Dupont, J. Billowes, S. Montesano, Tatsuya Katabuchi, A. Stamatopoulos, S. Barros, A. Mengoni, K. Rajeev, M. Caamaño, Petar Žugec, A. Kimura, Rugard Dressler, Francesca Matteucci, D. G. Jenkins, Emilio Andrea Maugeri, A. Tsinganis, P. Kavrigin, Nicola Colonna, M. Kokkoris, Mario Barbagallo, A. Oprea, Vasilis Vlachoudis, I. Knapova, V. Ketlerov, G. Tagliente, G. Cortes, Ralf Nolte, P. Vaz, B. Fernández-Domínguez, F. Käppeler, E. Griesmayer, Kathrin Göbel, Alberto Ventura, A. Casanovas, A. Goverdovski, O. Aberle, L. A. Damone, D. Bosnar, Jan Heyse, J. I. Porras, A. R. García, U. Battino, M. Brugger, A. Tattersall, V. Furman, T. J. Wright, F. Cerutti, C. Beinrucker, R. Vlastou, I. Duran, E. Leal-Cidoncha, E. Berthoumieux, A. Gawlik, Thomas Rauscher, D. Cano-Ott, M. Diakaki, E. González-Romero, R. Cardella, Javier Praena, F. Bečvář, C. Wolf, E. Mendoza, Peter Schillebeeckx, V. Bécares, E. Jericha, Paolo Finocchiaro, F. Gunsing, Dorothea Schumann, J. A. Ryan, Cristian Massimi, Pedro G. Ferreira, Mario Weigand, M. Krtička, M. Mirea, F. Calviño, H. Leeb, J. Perkowski, T. Martinez, Ariel Tarifeño-Saldivia, S. J. Lonsdale, J. Lerendegui-Marco, S. Heinitz, V. Khryachkov, E. Chiaveri, P. F. Mastinu, P. M. Milazzo, Y. H. Chen, I. F. Gonçalves, M. Sabaté-Gilarte, S. Warren, V. Variale, M. Mastromarco, Anton Wallner, J. Balibrea, D. M. Castelluccio, Hideo Harada, D. Macina, Carlos Guerrero, Claudia Lederer-Woods, P. V. Sedyshev, F. Mingrone, J. Andrzejewski, C. Rubbia, J. L. Tain, Niko Kivel, C. Weiss, Y. Kadi, S. Valenta, Marco Calviani, A. G. Smith, M. Dietz, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), n_TOF, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group

Subjects
Astrofísica, Astrophysics and Astronomy, Isotopes of germanium, Astrophysics::High Energy Astrophysical Phenomena, General Physics and Astronomy, chemistry.chemical_element, Germanium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Astrophysics, 7. Clean energy, Nuclear physics, Stellar nucleosynthesis, Isotopes, Nucleosynthesis, CERN, Neutron cross section, Neutron, Nuclear Physics - Experiment, n_TOF, Nuclear Experiment, Stellar activity, Physics, Física [Àrees temàtiques de la UPC], Neutron temperature, Neutron capture cross-section, Neutron capture, Activitat estelar, chemistry, Neutron time-of-flight, MACS, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], radiative neutron capture, Ge isotopes, n_TOF, stellar nucleosynthesis
Abstract

This work was supported by the Austrian Science Fund FWF (J3503), the Adolf Messer Foundation (Germany), the UK Science and Facilities Council (ST/M006085/1), and the European Research Council ERC-2015-StG No. 677497. We also acknowledge the support of the National Science Centre, Poland, under the grant UMO-2016/22/M/ST2/00183, the MSMT of the Czech Republic and the Croatian Science Foundation under the project IP-2018-01-8570., This manuscript summarizes the results of radiative neutron capture cross-section measurements on two stable germanium isotopes, Ge-70 and Ge-73. Experiments were performed at the n_TOF facility at CERN via the time-of-flight technique, over a wide neutron energy range, for all stable germanium isotopes (70,72,73,74, and 76). Results for Ge-70 [Phys. Rev. C 100, 045804 (2019)] and Ge-73 [Phys. Lett. B 790, 458 (2019)] are already published. In the field of nuclear structure, such measurements allow to study excited levels close to the neutron binding energy and to obtain information on nuclear properties. In stellar nucleosynthesis research, neutron induced reactions on germanium are of importance for nucleosynthesis in the weak component of the slow neutron capture processes., Austrian Science Fund (FWF) J3503, Adolf Messer Foundation (Germany), UK Science and Facilities Council ST/M006085/1, European Research Council (ERC), European Commission 677497, National Science Centre, Poland UMO-2016/22/M/ST2/00183, Ministry of Education, Youth & Sports - Czech Republic, Croatian Science Foundation IP-2018-01-8570

Published
2021
Full Text
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36. 4D-imaging of drip-line radioactivity by detecting proton emission from

Author

J, Giovinazzo, T, Roger, B, Blank, D, Rudolph, B A, Brown, H, Alvarez-Pol, A, Arokia Raj, P, Ascher, M, Caamaño-Fresco, L, Caceres, D M, Cox, B, Fernández-Domínguez, J, Lois-Fuentes, M, Gerbaux, S, Grévy, G F, Grinyer, O, Kamalou, B, Mauss, A, Mentana, J, Pancin, J, Pibernat, J, Piot, O, Sorlin, C, Stodel, J-C, Thomas, and M, Versteegen

Abstract

Proton radioactivity was discovered exactly 50 years ago. First, this nuclear decay mode sets the limit of existence on the nuclear landscape on the neutron-deficient side. Second, it comprises fundamental aspects of both quantum tunnelling as well as the coupling of (quasi)bound quantum states with the continuum in mesoscopic systems such as the atomic nucleus. Theoretical approaches can start either from bound-state nuclear shell-model theory or from resonance scattering. Thus, proton-radioactivity guides merging these types of theoretical approaches, which is of broader relevance for any few-body quantum system. Here, we report experimental measurements of proton-emission branches from an isomeric state in

Published
2020

37. Signature of a possible $\alpha $-cluster state in $N=Z$ doubly-magic $^{56}$Ni

Author

L. Perrot, S. M. Lukyanov, U. Garg, L. Caceres, B. Bastin, A. Krasznahorkay, M. A. Najafi, J. F. Libin, S. Damoy, Marine Vandebrouck, Franck Delaunay, Catherine Rigollet, L. Suen, M. Caamaño, Julien Gibelin, K. Boretzky, J. Van de Walle, Nasser Kalantar-Nayestanaki, Hidetoshi Akimune, H. Bouzomita, G. Lhoutellier, C. Stodel, J. Pancin, Riccardo Raabe, S. Bagchi, O. Kamalou, H. Savajols, M.N. Harakeh, T. Roger, B. Fernández-Domínguez, Y. E. Penionzhkevich, M. Sénoville, N. L. Achouri, K. Mazurek, G. F. Grinyer, E. Khan, S. Sambi, J. C. Thomas, M. Fujiwara, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Nuclear and High Energy Physics, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Physics, Particles & Fields, 0103 physical sciences, medicine, Incident energy, Nuclear fusion, ddc:530, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, ComputingMilieux_MISCELLANEOUS, Physics, Science & Technology, 010308 nuclear & particles physics, Cluster state, Physics, Nuclear, medicine.anatomical_structure, Physical Sciences, Atomic physics, α particles, Nucleus, Excitation
Abstract

An inelastic $\alpha$-scattering experiment on the unstable $N=Z$, doubly-magic $^{56}$Ni nucleus was performed in inverse kinematics at an incident energy of 50 A.MeV at GANIL. High multiplicity for $\alpha$-particle emission was observed within the limited phase-space of the experimental setup. This observation cannot be explained by means of the statistical-decay model. The ideal classical gas model at $kT$ = 0.4 MeV reproduces fairly well the experimental momentum distribution and the observed multiplicity of $\alpha$ particles corresponds to an excitation energy around 96 MeV. The method of distributed $m\alpha$-decay ensembles is in agreement with the experimental results if we assume that the $\alpha$-gas state in $^{56}$Ni exists at around $113^{+15}_{-17}$ MeV. These results suggest that there may exist an exotic state consisting of many $\alpha$ particles at the excitation energy of $113^{+15}_{-17}$ MeV., Comment: Accepted for publication in the European Physical Journal A

Published
2020

38. Neutron Capture on the s -Process Branching Point Tm171 via Time-of-Flight and Activation

Author

Claudia Lederer-Woods, A Kriesel, L. Piersanti, P. V. Sedyshev, Javier Praena, S. Lo Meo, J. Heyse, G. Vannini, B. Fernández-Domínguez, D. M. Castelluccio, F. Käppeler, D. Macina, Carlos Guerrero, D. Bosnar, M A Millán-Callado, F. Mingrone, J. Andrzejewski, J. Lerendegui-Marco, S. Amaducci, O. Aberle, M. Caamaño, E. Leal-Cidoncha, I. Duran, I. F. Gonçalves, D Berkovits, F. Cerutti, A. Gawlik, A. Goverdovski, G. Tagliente, Thomas Rauscher, V. Bécares, T Rodríguez-González, A Damone, Emilio Andrea Maugeri, G. Cortes, Leonid Weissman, S. Montesano, Michael Paul, K. Rajeev, A. Stamatopoulos, M. Kokkoris, S. Warren, R. Vlastou, E. Jericha, Paolo Finocchiaro, E. Berthoumieux, Francesca Matteucci, T Palchan-Hazan, A. Casanovas, S. Halfon, D. Cano-Ott, M. Diakaki, Ulli Köster, E. González-Romero, P. Kavrigin, D Kijel, V. Variale, Dimitri Rochman, A. Musumarra, Dorothea Schumann, J. A. Ryan, M. Tessler, Ariel Tarifeño-Saldivia, S. J. Lonsdale, A. Manna, P. Vaz, Ralf Nolte, E. Griesmayer, Ignacio Porras, P. J. Woods, L. Cosentino, A. Oprea, Tanja Heftrich, R. Cardella, C. Weiss, T Hirsh, A. R. García, mtext, M. Brugger, A Shor, Alberto Ventura, mrow, E. Dupont, P. C. Rout, Y. Kadi, N. Patronis, A. K. Saxena, V. Khryachkov, P. M. Milazzo, Arnaud Ferrari, C. Beinrucker, A. Pavlik, V. Furman, A. Mengoni, S. Valenta, C. Domingo-Pardo, T. J. Wright, B Kaizer, J. Billowes, Marco Calviani, F. Bečvář, V. Ketlerov, C. Wolf, A. G. Smith, Petar Žugec, E. Mendoza, M. Dietz, Peter Schillebeeckx, H Dafna, S. Heinitz, L. Audouin, Y Eisen, M. Bacak, C. Rubbia, Y Buzaglo, T. Glodariu, Roberto Losito, Rugard Dressler, mtext> Tof, M. Sabaté-Gilarte, A. Tsinganis, Nicola Colonna, M. A. Cortés-Giraldo, Vasilis Vlachoudis, Kathrin Göbel, A. Kimura, D. G. Jenkins, Mario Barbagallo, J. L. Tain, J. Marganiec, Niko Kivel, E. Chiaveri, P. F. Mastinu, M. Krtička, T. Martinez, Y. H. Chen, F. Gunsing, Cristian Massimi, M. Mirea, Rene Reifarth, Stefan Schmidt, F. Calviño, H. Leeb, J. M. Quesada, J. Perkowski, L. Tassan-Got, Sergio Cristallo, Pedro G. Ferreira, Mario Weigand, Tatsuya Katabuchi, A Barak, S. Barros, M. Mastromarco, Anton Wallner, J. Balibrea, and Hideo Harada

Subjects
Physics, General Physics and Astronomy, 7. Clean energy, 01 natural sciences, Neutron temperature, Nuclear physics, Neutron capture, Stellar nucleosynthesis, Nucleosynthesis, 0103 physical sciences, Neutron cross section, Neutron, Nuclide, 010306 general physics, s-process
Abstract

The neutron capture cross sections of several unstable nuclides acting as branching points in the s process are crucial for stellar nucleosynthesis studies. The unstable $^{171}$Tm(t$_{1/2}$=1.92 yr) is part of the branching around mass A∼170 but its neutron capture cross section as a function of the neutron energy is not known to date. In this work, following the production for the first time of more than 5 mg of $^{171}$Tm at the high-flux reactor Institut Laue-Langevin in France, a sample was produced at the Paul Scherrer Institute in Switzerland. Two complementary experiments were carried out at the neutron time-of-flight facility (n_TOF) at CERN in Switzerland and at the SARAF liquid lithium target facility at Soreq Nuclear Research Center in Israel by time of flight and activation, respectively. The result of the time-of-flight experiment consists of the first ever set of resonance parameters and the corresponding average resonance parameters, allowing us to make an estimation of the Maxwellian-averaged cross sections (MACS) by extrapolation. The activation measurement provides a direct and more precise measurement of the MACS at 30 keV: 384(40) mb, with which the estimation from the n_TOF data agree at the limit of 1 standard deviation. This value is 2.6 times lower than the JEFF-3.3 and ENDF/B-VIII evaluations, 25% lower than that of the Bao et al. compilation, and 1.6 times larger than the value recommended in the KADoNiS (v1) database, based on the only previous experiment. Our result affects the nucleosynthesis at the A∼170 branching, namely, the $^{171}$Yb abundance increases in the material lost by asymptotic giant branch stars, providing a better match to the available pre-solar SiC grain measurements compared to the calculations based on the current JEFF-3.3 model-based evaluation.

Published
2020

39. Investigation of the Pu240(n,f) reaction at the n_TOF/EAR2 facility in the 9 meV–6 MeV range

Author

R. J. W. Frost, A. Goverdovski, A. Mengoni, M. Krtička, V. Furman, T. J. Wright, I. Duran, G. Tagliente, Petar Žugec, Javier Praena, S. Lo Meo, T. Martinez, L. Cosentino, K. Deo, G. Vannini, V. Ketlerov, D. Bosnar, E. Dupont, A. Musumarra, Tatsuya Katabuchi, A. Ventura, M. Mirea, M. Mastromarco, S. Warren, A. Kimura, S. Heinitz, V. Variale, S. Barros, A. Tsinganis, Massimo Barbagallo, F. R. Palomo-Pinto, M. Caamaño, Rene Reifarth, E. Chiaveri, D. G. Jenkins, Anton Wallner, Stefan Schmidt, C. Paradela, Rugard Dressler, F. Calviño, Tanja Heftrich, P. F. Mastinu, L. Audouin, M. Licata, H. Leeb, J. M. Quesada, L. Tassan-Got, J. Balibrea, S. V. Suryanarayana, F. Mingrone, C. Lederer, I. Knapova, A. Riego-Perez, J. Perkowski, R. Vlastou, J. Marganiec, S. Valenta, Ariel Tarifeño-Saldivia, A. J. M. Plompen, F. Gunsing, P. Vaz, N. Colonna, Marco Calviani, E. Berthoumieux, P. Kavrigin, Ralf Nolte, A. G. Smith, M. A. Cortés-Giraldo, F. Cerutti, Cristian Massimi, A. Pavlik, E. Leal-Cidoncha, O. Aberle, E. Griesmayer, L. A. Damone, C. Domingo-Pardo, Hideo Harada, A. Hernández-Prieto, M. Sabaté-Gilarte, Kathrin Göbel, Vasilis Vlachoudis, V. Bécares, M. S. Robles, Thomas Rauscher, Jan Heyse, M. Kokkoris, C. Rubbia, Pedro G. Ferreira, Mario Weigand, C. Weiss, D. Cano-Ott, Y. Kadi, M. Diakaki, F. Bečvář, M. Bacak, E. Mendoza, Peter Schillebeeckx, J. Lerendegui-Marco, D. Macina, Carlos Guerrero, J. L. Tain, J. I. Porras, T. Glodariu, Roberto Losito, I. F. Gonçalves, Niko Kivel, B. Fernández-Domínguez, E. González-Romero, F. Käppeler, Fabio Belloni, A. R. García, Francesca Matteucci, M. Brugger, C. Beinrucker, V. Khryachkov, P. M. Milazzo, Ioana Gheorghe, N. Patronis, A. K. Saxena, Arnaud Ferrari, S. Montesano, J. Billowes, E. Jericha, A. Stamatopoulos, Paolo Finocchiaro, Dorothea Schumann, J. A. Ryan, P. V. Sedyshev, J. Andrzejewski, and G. Cortes

Subjects
Physics, Nuclear transmutation, 010308 nuclear & particles physics, Fission, Monte Carlo method, Radioactive waste, MicroMegas detector, 7. Clean energy, 01 natural sciences, Neutron temperature, Spent nuclear fuel, Nuclear physics, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics
Abstract

Background: Nuclear waste management is considered amongst the major challenges in the field of nuclear energy. A possible means of addressing this issue is waste transmutation in advanced nuclear systems, whose operation requires a fast neutron spectrum. In this regard, the accurate knowledge of neutron-induced reaction cross sections of several (minor) actinide isotopes is essential for design optimization and improvement of safety margins of such systems. One such case is Pu240, due to its accumulation in spent nuclear fuel of thermal reactors and its usage in fast reactor fuel. The measurement of the Pu240(n,f) cross section was previously attempted at the CERN n_TOF facility EAR1 measuring station using the time-of-flight technique. Due to the low amount of available material and the given flux at EAR1, the measurement had to last several months to achieve a sufficient statistical accuracy. This long duration led to detector deterioration due to the prolonged exposure to the high α activity of the fission foils, therefore the measurement could not be successfully completed. Purpose: It is aimed to determine whether it is feasible to study neutron-induced fission at n_TOF/EAR2 and provide data on the Pu240(n,f) reaction in energy regions requested for applications. Methods: The study of the Pu240(n,f) reaction was made at a new experimental area (EAR2) with a shorter flight path which delivered on average 30 times higher flux at fast neutron energies. This enabled the measurement to be performed much faster, thus limiting the exposure of the detectors to the intrinsic activity of the fission foils. The experimental setup was based on microbulk Micromegas detectors and the time-of-flight data were analyzed with an optimized pulse-shape analysis algorithm. Special attention was dedicated to the estimation of the non-negligible counting loss corrections with the development of a new methodology, and other corrections were estimated via Monte Carlo simulations of the experimental setup. Results: This new measurement of the Pu240(n,f) cross section yielded data from 9meV up to 6MeV incident neutron energy and fission resonance kernels were extracted up to 10keV. Conclusions: Neutron-induced fission of high activity samples can be successfully studied at the n_TOF/EAR2 facility at CERN covering a wide range of neutron energies, from thermal to a few MeV.

Published
2020

40. A compact fission detector for fission-tagging neutron capture experiments with radioactive fissile isotopes

Author

D. Macina, A. Musumarra, K. Göbel, M. Sabaté-Gilarte, E. Mendoza, A. Oprea, I. Knapova, N. V. Sosnin, T. Wright, J. Heyse, Rene Reifarth, N. Kivel, R. Nolte, L. Cosentino, J. Marganiec, P. F. Mastinu, P. Vaz, F. Bečvář, Annamaria Mazzone, Petar Žugec, M. Aiche, I. Duran, Stefan Kopecky, A. Saxena, A. Kimura, Alberto Ventura, G. Vannini, S. Valenta, Nicola Colonna, M. Kokkoris, M. A. Cortés-Giraldo, P. M. Milazzo, R. Dressler, P. Kavrigin, E. Dupont, Carlos Guerrero, G. Sibbens, M. Mastromarco, Marco Calviani, B. Laurent, E. González-Romero, P. Ferreira, Mario Barbagallo, L. Audouin, M. Krtička, A. Pavlik, A. G. Smith, J. Billowes, D. Schumann, E. Griesmayer, Anton Wallner, Alexandru Negret, G. Cortes, C. Domingo-Pardo, G. Tagliente, M. Bacak, L. A. Damone, F. Käppeler, J. Balibrea, Philip Woods, O. Aberle, D. Vanleeuw, F. Mingrone, J. Andrzejewski, F. Calviño, H. Leeb, E. A. Maugeri, A. Kalamara, T. Martinez, C. Weiss, R. Vlastou, Olivier Serot, Carlo Rubbia, V. Vlachoudis, J. Perkowski, M. Diakaki, D. Radeck, Alfredo Ferrari, E. Berthoumieux, Stephan Richter, P. Schillebeeckx, S. Warren, F. Gunsing, A. Masi, Damir Bosnar, Y. Kadi, A. Manna, Hideo Harada, Deniz Kurtulgil, V. Variale, D. G. Jenkins, Y. H. Chen, Cristian Massimi, P. V. Sedyshev, G. Belier, S. Heinitz, V. Furman, A. Stamatopoulos, E. Chiaveri, D. Cano-Ott, A. S. Brown, A. Casanovas, C. Lederer, E. Jericha, T. Glodariu, Paolo Finocchiaro, J. M. Quesada, L. Tassan-Got, A. Moens, J. A. Ryan, S. Amaducci, Simone Gilardoni, R. Cardella, Javier Praena, S. Lo Meo, M. Caamaño, F. Cerutti, B. Fernández-Domínguez, J. L. Tain, J. Taieb, L. Mathieu, E. Leal-Cidoncha, A. Gawlik, Thomas Rauscher, A. R. García, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Ignacio Porras, J. Lerendegui-Marco, I. F. Gonçalves, N. Patronis, Alberto Mengoni, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Bacak, M., Aiche, M., Belier, G., Berthoumieux, E., Diakaki, M., Dupont, E., Gunsing, F., Heyse, J., Kopecky, S., Laurent, B., Leeb, H., Mathieu, L., Moens, A., Richter, S., Schillebeeckx, P., Serot, O., Sibbens, G., Taieb, J., Vanleeuw, D., Vlachoudis, V., Aberle, O., Amaducci, S., Andrzejewski, J., Audouin, L., Balibrea, J., Barbagallo, M., Becvar, F., Billowes, J., Bosnar, D., Brown, A., Caamano, M., Calvino, F., Calviani, M., Cano-Ott, D., Cardella, R., Casanovas, A., Cerutti, F., Chen, Y. H., Chiaveri, E., Colonna, N., Cortes, G., Cortes-Giraldo, M. A., Cosentino, L., Damone, L. A., Domingo-Pardo, C., Dressler, R., Duran, I., Fernandez-Dominguez, B., Ferrari, A., Ferreira, P., Finocchiaro, P., Furman, V., Gobel, K., Garcia, A. R., Gawlik, A., Gilardoni, S., Glodariu, T., Goncalves, I. F., Gonzalez-Romero, E., Griesmayer, E., Guerrero, C., Harada, H., Heinitz, S., Jenkins, D. G., Jericha, E., Kappeler, F., Kadi, Y., Kalamara, A., Kavrigin, P., Kimura, A., Kivel, N., Knapova, I., Kokkoris, M., Krticka, M., Kurtulgil, D., Leal-Cidoncha, E., Lederer, C., Lerendegui-Marco, J., Lo Meo, S., Lonsdale, S. J., Macina, D., Manna, A., Marganiec, J., Martinez, T., Masi, A., Massimi, C., Mastinu, P., Mastromarco, M., Maugeri, E. A., Mazzone, A., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Musumarra, A., Negret, A., Nolte, R., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Porras, I., Praena, J., Quesada, J. M., Radeck, D., Rauscher, T., Reifarth, R., Rubbia, C., Ryan, J. A., Sabate-Gilarte, M., Saxena, A., Schumann, D., Sedyshev, P., Smith, A. G., Sosnin, N. V., Stamatopoulos, A., Tagliente, G., Tain, J. L., Tarifeno-Saldivia, A., Tassan-Got, L., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vlastou, R., Wallner, A., Warren, S., Weiss, C., Woods, P. J., Wright, T., Zugec, P., Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Bacak M., Aiche M., Belier G., Berthoumieux E., Diakaki M., Dupont E., Gunsing F., Heyse J., Kopecky S., Laurent B., Leeb H., Mathieu L., Moens A., Richter S., Schillebeeckx P., Serot O., Sibbens G., Taieb J., Vanleeuw D., Vlachoudis V., Aberle O., Amaducci S., Andrzejewski J., Audouin L., Balibrea J., Barbagallo M., Becvar F., Billowes J., Bosnar D., Brown A., Caamano M., Calvino F., Calviani M., Cano-Ott D., Cardella R., Casanovas A., Cerutti F., Chen Y.H., Chiaveri E., Colonna N., Cortes G., Cortes-Giraldo M.A., Cosentino L., Damone L.A., Domingo-Pardo C., Dressler R., Duran I., Fernandez-Dominguez B., Ferrari A., Ferreira P., Finocchiaro P., Furman V., Gobel K., Garcia A.R., Gawlik A., Gilardoni S., Glodariu T., Goncalves I.F., Gonzalez-Romero E., Griesmayer E., Guerrero C., Harada H., Heinitz S., Jenkins D.G., Jericha E., Kappeler F., Kadi Y., Kalamara A., Kavrigin P., Kimura A., Kivel N., Knapova I., Kokkoris M., Krticka M., Kurtulgil D., Leal-Cidoncha E., Lederer C., Lerendegui-Marco J., Lo Meo S., Lonsdale S.J., Macina D., Manna A., Marganiec J., Martinez T., Masi A., Massimi C., Mastinu P., Mastromarco M., Maugeri E.A., Mazzone A., Mendoza E., Mengoni A., Milazzo P.M., Mingrone F., Musumarra A., Negret A., Nolte R., Oprea A., Patronis N., Pavlik A., Perkowski J., Porras I., Praena J., Quesada J.M., Radeck D., Rauscher T., Reifarth R., Rubbia C., Ryan J.A., Sabate-Gilarte M., Saxena A., Schumann D., Sedyshev P., Smith A.G., Sosnin N.V., Stamatopoulos A., Tagliente G., Tain J.L., Tarifeno-Saldivia A., Tassan-Got L., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vlastou R., Wallner A., Warren S., Weiss C., Woods P.J., Wright T., and Zugec P.

Subjects
Nuclear and High Energy Physics, Fission, Physics::Instrumentation and Detectors, Nuclear Theory, Física::Física de partícules [Àrees temàtiques de la UPC], Nuclear physics, Context (language use), Neutrons--Captura, 01 natural sciences, 7. Clean energy, Neutrons--Capture, 0103 physical sciences, Physics::Atomic and Molecular Clusters, 233 U, ddc:530, n_TOF, 010306 general physics, Nuclear Experiment, Instrumentation, Energies::Energia nuclear [Àrees temàtiques de la UPC], Physics, [PHYS]Physics [physics], Fission detector, 233U, Time-of-flight, Física [Àrees temàtiques de la UPC], Fissile material, 010308 nuclear & particles physics, Detector, Neutron radiation, Fast fission, NATURAL SCIENCES. Physics, Calorimeter, PRIRODNE ZNANOSTI. Fizika, Neutron capture, 13. Climate action, Física nuclear, Other
Abstract

In the measurement of neutron capture cross-sections of fissile isotopes, the fission channel is a source of background which can be removed efficiently using the so-called fission-tagging or fission-veto technique. For this purpose a new compact and fast fission chamber has been developed. The design criteria and technical description of the chamber are given within the context of a measurement of the 233U(n, ������) cross-section at the n_TOF facility at CERN, where it was coupled to the n_TOF Total Absorption Calorimeter. For this measurement the fission detector was optimized for time resolution, minimization of material in the neutron beam and for alpha-fission discrimination. The performance of the fission chamber and its application as a fission tagging detector are discussed., This work was partially supported by the French NEEDS/NACRE Project and by the European Commission within HORIZON2020 via the EURATOM Project EUFRAT.

Published
2020

41. Evidence for a New Compact Symmetric Fission Mode in Light Thorium Isotopes

Author

Andreas Martin Heinz, M. Caamaño, Enrique Casarejos, A. Ebran, Yassid Ayyad, A. Chatillon, G. Boutoux, J. Taieb, J. Vargas, J. L. Rodriguez-Sanchez, T. Gorbinet, B. Laurent, F. Farget, A. Prochazka, S. Pietri, D. Cortina-Gil, C. Nociforo, C. Paradela, B. Fernández-Domínguez, E. Pellereau, L. Audouin, N. Kurz, Helmut Weick, Håkan T Johansson, L. Grente, Herbert A. Simon, J. Benlliure, H. Alvarez-Pol, D. M. Rossi, Bernd Voss, G. Belier, J. F. Martin, L. Tassan-Got, A. Kelic-Heil, Beatriz Jurado, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Isotope, Fission, Nuclear Theory, General Physics and Astronomy, Thorium, chemistry.chemical_element, Actinide, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Effective nuclear charge, Physics::Geophysics, Nuclear physics, chemistry, 0103 physical sciences, Multiplicity (chemistry), 010306 general physics, Nuclear Experiment, Bond cleavage, Isotopes of thorium, Nuclear Physics
Abstract

International audience; Taking benefit of the R3B/SOFIA setup to measure the mass and the nuclear charge of both fission fragments in coincidence with the total prompt-neutron multiplicity, the scission configurations are inferred along the thorium chain, from the asymmetric fission in the heavier isotopes to the symmetric fission in the neutron-deficient thorium. Against all expectations, the symmetric scission in the light thorium isotopes shows a compact configuration, which is in total contrast to what is known in the fission of the heavier thorium isotopes and heavier actinides. This new main symmetric scission mode is characterized by a significant drop in deformation energy of the fission fragments of about 19 MeV, compared to the well-known symmetric scission in the uranium-plutonium region.

Published
2020

42. Scission configuration of U239 from yields and kinetic information of fission fragments

Author

T. Roger, D. Ramos, M.O. Frégeau, I. Tsekhanovich, E. Galiana-Baldó, A. Henriques, P. Morfouace, B. Jacquot, C. Schmitt, M. Caamaño, S. Biswas, M. Rejmund, J. Piot, B. Jurado, Andreas Martin Heinz, B. Fernández-Domínguez, L. Audouin, Y.H. Kim, F. Farget, P. Teubig, A. Lemasson, D. Durand, D. Ralet, Dieter Ackermann, H. Alvarez-Pol, Emyr Clement, Daniel Galaviz, and J.D. Frankland

Subjects
Nuclear reaction, Physics, Proton, 010308 nuclear & particles physics, Fission, Nuclear Theory, Kinetic energy, 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Nucleon, Excitation, Beam (structure)
Abstract

The simultaneous measurement of the isotopic fission-fragment yields and fission-fragment velocities of U239 has been performed for the first time. The U239 fissioning system was produced in one-neutron transfer reactions between a U238 beam at 5.88 MeV/nucleon and a Be9 target. The combination of inverse kinematics at low energy and the use of the VAMOS++ spectrometer at the GANIL facility allows the isotopic identification of the full fission-fragment distribution and their velocity in the reference frame of the fissioning system. The proton and neutron content of the fragments at scission, their total kinetic and total excitation energy, as well as the neutron multiplicity were determined. Information from the scission point configuration is obtained from these observables and the correlation between them. The role of the octupole-deformed proton and neutron shells in the fission-fragment production is discussed.

Published
2020

43. Measurement of the Pu-242(n,gamma) cross section from thermal to 500 keV at the Budapest research reactor and CERN n_TOF-EAR1 facilities

Author

O. Aberle, G. Cortes, C. Rubbia, Rugard Dressler, V. Khryachkov, P. M. Milazzo, Pedro G. Ferreira, Mario Weigand, A. Oprea, Tamás Belgya, A. Goverdovski, L. Cosentino, E. Jericha, A. Tsinganis, Paolo Finocchiaro, Dorothea Schumann, J. A. Ryan, L. Audouin, F. Mingrone, K. Rajeev, J. Lerendegui-Marco, J. L. Tain, A. Kimura, D. M. Castelluccio, J. Andrzejewski, Francesca Matteucci, I. Knapova, A. Musumarra, F. Cerutti, Nicola Colonna, M. A. Cortés-Giraldo, T. Martinez, Niko Kivel, I. F. Gonçalves, I. Duran, Mario Barbagallo, F. Gunsing, V. Vlachoudis, G. Vannini, A. R. García, Cristian Massimi, P. Vaz, P. J. Woods, P. C. Rout, M. Caamaño, Tanja Heftrich, C. Weiss, G. Tagliente, C. Lederer, Alberto Ventura, J. Marganiec, A. Riego-Perez, Ariel Tarifeño-Saldivia, S. J. Lonsdale, M. Mirea, V. Bécares, M. Brugger, D. Macina, S. Heinitz, Carlos Guerrero, R. Vlastou, D. Cano-Ott, M. Diakaki, Y. Kadi, A. Pavlik, F. Calviño, H. Leeb, B. Fernández-Domínguez, A. Casanovas, F. Käppeler, E. Chiaveri, Javier Praena, S. Lo Meo, N. Patronis, A. K. Saxena, C. Domingo-Pardo, E. Berthoumieux, Diego Vescovi, J. Perkowski, S. Valenta, Arnaud Ferrari, D. G. Jenkins, P. F. Mastinu, F. Bečvář, M. Bacak, Marco Calviani, C. Beinrucker, C. Wolf, P. Kavrigin, Kathrin Göbel, E. Mendoza, Alberto Mengoni, A. G. Smith, Ralf Nolte, J. Billowes, Jan Heyse, E. Leal-Cidoncha, Peter Schillebeeckx, E. Griesmayer, Tatsuya Katabuchi, D. Bosnar, L. A. Damone, M. Krtiička, R. Cardella, Emilio Andrea Maugeri, S. Barros, M. Kokkoris, A. Gawlik, J. I. Porras, Rene Reifarth, T. Glodariu, Thomas Rauscher, S. Warren, Roberto Losito, Stefan Schmidt, J. M. Quesada, L. Tassan-Got, Y. H. Chen, V. Variale, P. V. Sedyshev, Arnd R. Junghans, Petar Žugec, E. González-Romero, V. Ketlerov, V. Furman, Klaus Eberhardt, T. J. Wright, S. Montesano, A. Stamatopoulos, M. Mastromarco, Anton Wallner, J. Balibrea, M. Sabaté-Gilarte, Hideo Harada, E. Dupont, Boglárka Maróti, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, n_TOF, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ge, Z., Shu, N., Chen, Y., Wang, W., Zhang, H., and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Large Hadron Collider, Isotope, 010308 nuclear & particles physics, Fission, QC1-999, n_TOF, 242Pu, neutron capture, neutron time of flight, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Resonance (particle physics), Nuclear physics, Stack (abstract data type), 0103 physical sciences, Neutron, Research reactor, Nuclear Physics - Experiment, Neutron activation analysis, 010306 general physics
Abstract

The design and operation of innovative nuclear systems requires a better knowledge of the capture and fission cross sections of the Pu isotopes. For the case of capture on 242Pu, a reduction of the uncertainty in the fast region down to 8-12% is required. Moreover, aiming at improving the evaluation of the fast energy range in terms of average parameters, the OECD NEA High Priority Request List (HPRL) requests high-resolution capture measurements with improved accuracy below 2 keV. The current uncertainties also affect the thermal point, where previous experiments deviate from each other by 20%. A fruitful collaboration betwen JGU Mainz and HZ Dresden-Rossendorf within the EC CHANDA project resulted in a 242Pu sample consisting of a stack of seven fission-like targets making a total of 95(4) mg of 242Pu electrodeposited on thin (11.5 μm) aluminum backings. This contribution presents the results of a set of measurements of the 242Pu(n, γ) cross section from thermal to 500 keV combining different neutron beams and techniques. The thermal point was determined at the Budapest Research Reactor by means of Neutron Activation Analysis and Prompt Gamma Analysis, and the resolved (1 eV - 4 keV) and unresolved (1 - 500 keV) resonance regions were measured using a set of four Total Energy detectors at the CERN n_TOF-EAR1. European Commission 334315, 605203 Ministerio de Economía y Competitividad FPA2013-45083-P, FPA2014-53290-C2-2-P, FPA2016-77689-C2-1-R German Federal Ministry for Education and Research (BMBF) 03NUK13A

Published
2020

44. Physics opportunities with the Advanced Gamma Tracking Array: AGATA

Author

W. Korten, A. Bracco, A. Atac, G. Benzoni, S. Leoni, P. Reiter, A. Goasduff, Eric Clément, K. A. Gladnishki, F. Recchia, A. Jungclaus, Bo Cederwall, G. Duchêne, D. G. Jenkins, A. Nannini, P. Bednarczyk, M. Zielińska, Dirk Rudolph, Riccardo Raabe, B. Million, A. Tumino, P. J. Nolan, D. R. Napoli, B. Fernández-Domínguez, F. Didierjean, Johan Nyberg, Herbert Hess, A. Gadea, D. Tonev, M. Ciemala, G. Rainovski, D. T. Doherty, Joakim Cederkäll, A. Obertelli, J. Gerl, J. J. Valiente-Dobón, B. Fornal, Begoña Quintana, J. Ljungvall, Ch. Theisen, Janne Pakarinen, G. de Angelis, P. R. John, M. Kmiecik, O. Wieland, Zs. Dombrádi, J. Simpson, A. J. Boston, M. Górska, Zs. Podolyák, D. Curien, J. Dudek, Norbert Pietralla, F. C. L. Crespi, A. Maj, K. Wimmer, Paul Greenlees, D. Beaumel, M. Labiche, A. Lopez-Martens, A. Korichi, M. A. Bentley, D. Mengoni, Liam Gaffney, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), AGATA, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Ministerio de Ciencia, Innovación y Universidades (España), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Radioactive ion beams, Nuclear and High Energy Physics, NEUTRON-RICH, Position resolution, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Accelerator Physics and Instrumentation, Tracking (particle physics), 7. Clean energy, 01 natural sciences, Physics, Particles & Fields, Subatomär fysik, Optics, Subatomic Physics, 0103 physical sciences, Gamma spectroscopy, SPECTROMETER, ddc:530, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], SUPERHEAVY ELEMENTS, 010306 general physics, ROTATIONAL BAND, DETECTOR, Physics, Science & Technology, Spectrometer, 010308 nuclear & particles physics, business.industry, European research, Detector, Acceleratorfysik och instrumentering, FISSION-BARRIERS, PERFORMANCE, Physics, Nuclear, SPIN, Physical Sciences, SHELL-MODEL, AGATA, business, DECAY
Abstract

AGATA Collaboration, New physics opportunities are opening up by the Advanced Gamma Tracking Array, AGATA, as it evolves to the full 4π instrument. AGATA is a high-resolution γ-ray spectrometer, solely built from highly segmented high-purity Ge detectors, capable of measuring γ rays from a few tens of keV to beyond 10 MeV, with unprecedented efficiency, excellent position resolution for individual γ-ray interactions, and very high count-rate capability. As a travelling detector AGATA will be employed at all major current and near-future European research facilities delivering stable and radioactive ion beams., The AGATA project has been supported by the European Structural Funds FSE FEDER, the Academy of Finland FIRI program, Finland, the Direction de Recherches Fondamentales of CEA, France, the Institut National de Physique Nucléaire et de Physique des Particules (IN2P3) of CNRS, France, the Bundesministerium für Bildung und Forschung (BMBF), Germany, the Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), Hungary, the IstitutoNazionale di Fisica Nucleare (INFN), Italy, theNational Science Center (NCN), Poland, the Knut and AliceWallenberg foundation (Sweden), the Swedish Research Council, the Conselleria d’Educació, Investigació, Cultura i Esport, Generalitat Valenciana and Ministerio de Ciencia, Innovación y Universidades, Spain, the Türkiye Bilimsel ve Teknolojik Ara¸stirma Kurumu (TÜBITAK), Turkey, and the United Kingdom Research and Innovation – Science and Technology Facilities Council (UKRI-STFC).

Published
2020

45. Structure of superheavy hydrogen 7H

Author

Naoyuki Itagaki, A. M. Moro, J. Gibelin, D. Cortina-Gil, C. Rodríguez Tajes, B. Fernández–Domínguez, G. F. Grinyer, F. Farget, D. Perez Loureiro, Riccardo Raabe, J. Pancin, J. Benlliure, S. Sambi, S. Bagchi, M. Caamaño, Bertrand Jacquot, T. Roger, Marine Vandebrouck, H. Savajols, B. Pietras, D. Ramos, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Universidade de Santiago de Compostela [Spain] (USC ), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universidad de Sevilla / University of Sevilla, KVI-CART, University of Groningen, University of Groningen [Groningen], Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Yukawa Institute for Theoretical Physics (YITP), Kyoto University, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, [PHYS]Physics [physics], Proton, Hydrogen, 010308 nuclear & particles physics, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, chemistry.chemical_element, Nuclear matter, 01 natural sciences, 7. Clean energy, Nuclear physics, chemistry, Pairing, 0103 physical sciences, Nuclear force, Neutron, Halo, 010306 general physics, Ground state, Nuclear Experiment
Abstract

The properties of nuclei with extreme neutron–to–proton ratios reveal the limitations of state-ofthe-art nuclear models and are key to understand nuclear forces. 7H, with six neutrons and a single proton, is the nuclear system with the most unbalanced neutron–to–proton ratio ever known, but its sheer existence and properties are still a challenge for experimental efforts and theoretical models. We report here the first measurement of the basic characteristics and structure of the ground state of 7H; they depict a system with a triton core surrounded by an extended four-neutron halo, built by neutron pairing, that decays through a unique four–neutron emission with a relatively long half-life. These properties are a prime example of new phenomena occurring in almost pure-neutron nuclear matter, beyond the binding limits of the nuclear landscape, that are yet to be described within our current models.

Published
2020

46. Scission configuration of U 239 from yields and kinetic information of fission fragments

Author

D. Ramos, M. Caamaño, A. Lemasson, M. Rejmund, H. Alvarez-Pol, L. Audouin, J. D. Frankland, B. Fernández-Domínguez, E. Galiana-Baldó, J. Piot, C. Schmitt, D. Ackermann, S. Biswas, E. Clement, D. Durand, F. Farget, M. O. Fregeau, D. Galaviz, A. Heinz, A. Henriques, B. Jacquot, B. Jurado, Y. H. Kim, P. Morfouace, D. Ralet, T. Roger, P. Teubig, I. Tsekhanovich

Published
2020
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47. Accurate measurement of the standard 235U(n,f) cross section from thermal to 170 keV neutron energy

Author

A. Pavlik, C. Domingo-Pardo, J. Lerendegui-Marco, Pedro G. Ferreira, S. Amaducci, Emilio Andrea Maugeri, P. Kavrigin, Javier Praena, S. Lo Meo, I. F. Gonçalves, Ralf Nolte, M. Kokkoris, S. Valenta, A. Mengoni, F. Cerutti, D. Bosnar, J. Marganiec, Marco Calviani, E. Griesmayer, Simone Gilardoni, A. G. Smith, F. Mingrone, G. Tagliente, R. Cardella, L. A. Damone, C. Lederer, M. Sabaté-Gilarte, G. Vannini, N. V. Sosnin, Rugard Dressler, J. L. Tain, P. J. Woods, E. Chiaveri, P. F. Mastinu, F. Bečvář, E. Mendoza, C. Weiss, Niko Kivel, A. Kimura, N. Patronis, A. Casanovas, A. K. Saxena, Annamaria Mazzone, Petar Žugec, I. Knapova, A. Masi, O. Aberle, Rene Reifarth, A. R. García, P. Vaz, Arnaud Ferrari, F. Calviño, Nicola Colonna, H. Leeb, Peter Schillebeeckx, M. Caamaño, M. A. Cortés-Girardo, D. Cano-Ott, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Vasilis Vlachoudis, A. Musumarra, D. G. Jenkins, J. Billowes, M. Diakaki, A. Stamatopoulos, Alberto Ventura, J. Perkowski, M. Mastromarco, Kathrin Göbel, L. Cosentino, Ignacio Porras, M. Bacak, Mario Barbagallo, Deniz Kurtulgil, P. V. Sedyshev, M. Krtička, F. Gunsing, A. Manna, J. M. Quesada, L. Tassan-Got, E. Leal-Cidoncha, T. Glodariu, A. Gawlik, Anton Wallner, Thomas Rauscher, Jan Heyse, T. Martinez, A. Oprea, G. Cortes, Cristian Massimi, A. Kalamara, J. Balibrea, E. González-Romero, Y. H. Chen, C. Rubbia, V. Furman, T. J. Wright, Y. Kadi, D. Macina, R. Vlastou, D. Radeck, Carlos Guerrero, E. Berthoumieux, E. Jericha, L. Audouin, Paolo Finocchiaro, Dorothea Schumann, Hideo Harada, Alexandru Negret, J. A. Ryan, B. Fernández-Domínguez, F. Käppeler, A. S. Brown, S. Warren, P. M. Milazzo, V. Variale, S. Heinitz, J. Andrzejewski, I. Duran, E. Dupont, Ge, Z., Shu, N., Chen, Y., Wang, W., Zhang, H., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, n_TOF, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Large Hadron Collider, Silicon, 010308 nuclear & particles physics, Fission, Physics::Instrumentation and Detectors, QC1-999, Monte Carlo method, Detector, n_TOF, 235U, fission, neutron time of flight, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Neutron temperature, Nuclear physics, Cross section (physics), chemistry, 0103 physical sciences, Thermal, Nuclear Physics - Experiment, 010306 general physics
Abstract

An accurate measurement of the 235U(n,f) cross section from thermal to 170 keV of neutron energy has recently been performed at n_TOF facility at CERN using 6Li(n,t)4He and 10B(n,α)7Li as references. This measurement has been carried out in order to investigate a possible overestimation of the 235U fission cross section evaluation provided by most recent libraries between 10 and 30 keV. A custom experimental apparatus based on in-beam silicon detectors has been used, and a Monte Carlo simulation in GEANT4 has been employed to characterize the setup and calculate detectors efficiency. The results evidenced the presence of an overestimation in the interval between 9 and 18 keV and the new data may be used to decrease the uncertainty of 235U(n,f) cross section in the keV region.

Published
2020

48. Low-lying single-particle structure of 17C and the N = 14 sub-shell closure

Author

Q. Deshayes, N. Curtis, F. Rotaru, Maria Fisichella, Franck Delaunay, S. Bailey, X. Pereira-López, Takaharu Otsuka, M. Assié, L. Caceres, F. M. Marqués, S. Franchoo, B. Le Crom, Julien Gibelin, Eric Clément, L. Perrot, A. Gillibert, A. Corsi, P. Morfouace, J. Walshe, S. Leblond, I. Stefan, G. F. Grinyer, J. C. Thomas, N. de Séréville, Daisuke Suzuki, Y. Blumenfeld, J. Piot, A. M. Moro, A. Matta, F. Farget, D. Ramos, R. Borcea, J. Lois-Fuentes, C. Wheldon, M. Stanoiu, N. L. Achouri, B. Bastin, C. Stodel, E. C. Pollacco, W. N. Catford, N. A. Orr, O. Sorlin, V. Lapoux, T. Kokalova, Robin Smith, Toshio Suzuki, T. Roger, Marine Vandebrouck, B. Fernández-Domínguez, Natalia Timofeyuk, A. Knapton, M. Sénoville, J. Pancin, M. Caamaño, Martin Freer, J. A. Lay, F. Hammache, C. Rodriguez-Tajes, O. Kamalou, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Consejo de Instalaciones Científicas y Tecnológicas de UKRI. Reino Unido, Agencia Estatal de Investigación. España, Ministerio de Economia, Industria y Competitividad (MINECO). España, Ministerio de Ciencia, Innovación y Universidades (MICINN). España, European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER), European Union (UE). H2020, Universidade de Santiago de Compostela [Spain] (USC ), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Valence (chemistry), 010308 nuclear & particles physics, SHELL model, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Molecular physics, lcsh:QC1-999, Excited state, 0103 physical sciences, Bound state, Neutron, Halo, Nuclear Experiment (nucl-ex), 010306 general physics, Ground state, Nuclear Experiment, ComputingMilieux_MISCELLANEOUS, lcsh:Physics
Abstract

The first investigation of the single-particle structure of the bound states of 17C, via the d(16C, p) transfer reaction, has been undertaken. The measured angular distributions confirm the spin-parity assignments of 1/2+ and 5/2+ for the excited states located at 217 and 335 keV, respectively. The spectroscopic factors deduced for these states exhibit a marked single-particle character, in agreement with shell model and particle-core model calculations, and combined with their near degeneracy in energy provide clear evidence for the absence of the N = 14 sub-shell closure. The very small spectroscopic factor found for the 3/2+ ground state is consistent with theoretical predictions and indicates that the {\nu}1d3/2 strength is carried by unbound states. With a dominant l = 0 valence neutron configuration and a very low separation energy, the 1/2+ excited state is a one-neutron halo candidate., Comment: 7 pages, 5 figures, Accepted for publication in Physics Letters B

Published
2020
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49. Experimental study of 4 n with 8He(p,2p) reaction

Author

M. Böhmer, Masaki Sasano, S. Reichert, Naohito Inabe, S. Chen, T. Shimada, M. Matsumoto, Susumu Shimoura, I. Stefan, J. Kahlbow, N. Kalantar-Nayestanaki, T. Harada, D. Symochko, István Kuti, S. W. Huang, D. Cortina, Tomohiro Uesaka, Z. Ge, N. L. Achouri, Yosuke Kondo, Hiroyuki Takeda, K. Yoneda, B. Fernández-Domínguez, U. Forsberg, Z. Elekes, Roman Gernhäuser, Y. Yasuda, H. Suzuki, Yohei Shimizu, D. Beaumel, D. Kim, C. A. Douma, Yukie Maeda, A. Hirayama, J. M. Gheller, Heiko Scheit, F. Dufter, T. Elidiano, Yasuhiro Togano, M. L. Cortés, M. Potlog, Nobuyuki Chiga, P. J. Li, Juzo Zenihiro, B. Yang, T. Isobe, M. Caamaño, Thomas Aumann, H. T. Törnqvsit, A. Gillibert, D. S. Ahn, F. Schindler, M.N. Harakeh, J. Feng, J. Tscheuschner, S. Kim, Atsumi Saito, L. Zanetti, P. Koseoglou, V. Wagner, M. Parlog, B. M. Godoy, N. Orr, Takashi Nakamura, Yu-xin Liu, J. Mayer, A. Obertelli, Yuya Kubota, Hideaki Otsu, S. Storck, S. Masuoka, K. Boretzky, Kathrin Wimmer, H. Miki, T. Tomai, F. M. Marqués, V. Panin, P. Doornenbal, Stefanos Paschalis, L. Yang, Satoshi Takeuchi, M. A. Knösel, Igor Gašparić, T. Kobayashi, C. Lehr, H. Yang, C. Lenain, M. Miwa, Z. Halász, A. Revel, H. Sato, T. Fujino, D. M. Rossi, H. Baba, S. Park, I. Murray, L. Stuhl, H. Yamada, J. Gibelin, J. Tanaka, Naoki Fukuda, RIKEN Nishina Center for Accelerator-Based Science, German Research Foundation, Federal Ministry of Education and Research (Germany), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Paper, History, 010308 nuclear & particles physics, tetraneutron, nuclear force, proton knock-out, radioactive beams, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Computer Science Applications, Education, ddc, Nuclear physics, 0103 physical sciences, Tetraneutron, Neutron, ddc:530, 010306 general physics
Abstract

7 pags., 3 figs. -- 27th International Nuclear Physics Conference (INPC2019), The tetraneutron has attracted the attention of nuclear physicists during the past decades, but there is still no unambiguous confirmation of its existence or nonexistence. A new experiment based on 8 He(p,2p)7H{t+4n} reaction, with direct detection of the four neutrons, has been carried out at RIBF, which can hopefully help to draw a definite conclusion on the tetraneutron system., We acknowledge the support of the RIBF accelerator staff and the BigRIPS team for providing the high-quality beam. Z. H. Yang acknowledges the financial support from the Foreign Postdoctoral Researcher program of RIKEN. T. Aumann acknowledges the support by DFG via SFB 1245. P. Koseoglou acknowledges the support from BMBF (NUSTAR.DA grant No.05P 15RDFN1).

Published
2020

50. Demonstrator Detection System for the Active Target and Time Projection Chamber (ACTAR TPC) project

Author

B. Osmond, B. Blank, G. Minier, J. Giovinazzo, A.T. Laffoley, T. Goigoux, Tommaso Marchi, H. Alvarez-Pol, P. Konczykowski, J.A. Swartz, Jiecheng Yang, C. Maugeais, J. L. Pedroza, M. Caamaño, P. Sénécal, D. Suzuki, G. Lebertre, F. Saillant, O. Poleshchuk, L. Legeard, B. Raine, Francesca Renzi, G. F. Grinyer, S. Ceruti, P. Rosier, B. Mauss, F. Flavigny, T. Roger, N. Lecesne, E. C. Pollacco, B. Fernández-Domínguez, J. Pancin, Riccardo Raabe, Mathieu Babo, C. Wouters, J. L. Henares, J. Pibernat, J. Daemen, B. Duclos, P. Sizun, G. Wittwer, S. Damoy, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
micromegas, Physics, Nuclear and High Energy Physics, Range (particle radiation), Time projection chamber, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Plane (geometry), Amplifier, Detector, Nuclear physics, MicroMegas detector, 01 natural sciences, Square (algebra), Optics, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Active target, 010306 general physics, business, Instrumentation, Realization (systems)
Abstract

The design, realization and operation of a prototype or “demonstrator” version of an active target and time projection chamber (ACTAR TPC) for experiments in nuclear physics is presented in detail. The heart of the detection system features a micromegas gas amplifier coupled to a high-density pixelated pad plane with square pad sizes of 2 × 2 mm 2 . The detector has been thoroughly tested with several different gas mixtures over a wide range of pressures and using a variety of sources of ionizing radiation including laser light, an α -particle source and heavy-ion beams of 24Mg and 58Ni accelerated to energies of 4.0 MeV/u. Results from these tests and characterization of the detector response over a wide range of operating conditions will be described. These developments have served as the basis for the design of a larger detection system that is presently under construction.

Published
2018

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