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108 results on '"N de Séréville"'

1. 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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2. Neutron-proton pairing in the N=Z radioactive fp-shell nuclei 56Ni and 52Fe probed by pair transfer

Author

B. Le Crom, M. Assié, Y. Blumenfeld, J. Guillot, H. Sagawa, T. Suzuki, M. Honma, N.L. Achouri, B. Bastin, R. Borcea, W.N. Catford, E. Clément, L. Cáceres, M. Caamaño, A. Corsi, G. De France, F. Delaunay, N. De Séréville, B. Fernandez-Dominguez, M. Fisichella, S. Franchoo, A. Georgiadou, J. Gibelin, A. Gillibert, F. Hammache, O. Kamalou, A. Knapton, V. Lapoux, S. Leblond, A.O. Macchiavelli, F.M. Marqués, A. Matta, L. Ménager, P. Morfouace, N.A. Orr, J. Pancin, X. Pereira-Lopez, L. Perrot, J. Piot, E. Pollacco, D. Ramos, T. Roger, F. Rotaru, A.M. Sánchez-Benítez, M. Sénoville, O. Sorlin, M. Stanoiu, I. Stefan, C. Stodel, D. Suzuki, J.-C. Thomas, and M. Vandebrouck

Subjects
Radioactive beam, Direct reactions, Neutron-proton pairing, Cooper pairs, Physics, QC1-999
Abstract

The isovector and isoscalar components of neutron-proton pairing are investigated in the N=Z unstable nuclei of the fp-shell through the two-nucleon transfer reaction (p,3He) in inverse kinematics. The combination of particle and gamma-ray detection with radioactive beams of 56Ni and 52Fe, produced by fragmentation at the GANIL/LISE facility, made it possible to carry out this study for the first time in a closed and an open-shell nucleus in the fp-shell. The transfer cross-sections for ground-state to ground-state (J=0+, T=1) and to the first (J=1+, T=0) state were extracted for both cases together with the transfer cross-section ratios σ(0+,T=1)/σ(1+,T=0). They are compared with second-order distorted-wave born approximation (DWBA) calculations. The enhancement of the ground-state to ground-state pair transfer cross-section close to mid-shell, in 52Fe, points towards a superfluid phase in the isovector channel. For the “deuteron-like” transfer, very low cross-sections to the first (J=1+, T=0) state were observed both for 56Ni(p,3He) and 52Fe(p,3He) and are related to a strong hindrance of this channel due to spin-orbit effect. No evidence for an isoscalar deuteron-like condensate is observed.

Published
2022
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3. 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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4. Progress on nuclear reaction rates affecting the stellar production of 26Al

Author

A M Laird, M Lugaro, A Kankainen, P Adsley, D W Bardayan, H E Brinkman, B Côté, C M Deibel, R Diehl, F Hammache, J W den Hartogh, J José, D Kurtulgil, C Lederer-Woods, G Lotay, G Meynet, S Palmerini, M Pignatari, R Reifarth, N de Séréville, A Sieverding, R J Stancliffe, T C L Trueman, T Lawson, J S Vink, C Massimi, A Mengoni, Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. GAA - Grup d'Astronomia i Astrofísica

Subjects
Radioisotopes, Radioisotope, isotoopit, Nuclear and High Energy Physics, Isòtops radioactius, core-collapse supernovae (CCSN), tähdet, Física [Àrees temàtiques de la UPC], astrofysiikka, Reaccions nuclears--Tarifes, nucleosynthesis, Nuclear reactions--Rates, nuclear reaction rate, Nuclear reaction rate, ydinreaktiot, kääpiötähdet, supernovat, radioisotope 26Al, radioisotope, alumiini, Wolf-Rayet (WR) winds, ydinfysiikka, Nucleosynthesis, Nucleosíntesi
Abstract

The radioisotope 26Al is a key observable for nucleosynthesis in the Galaxy and the environment of the early Solar System. To properly interpret the large variety of astronomical and meteoritic data, it is crucial to understand both the nuclear reactions involved in the production of 26Al in the relevant stellar sites and the physics of such sites. These range from the winds of low- and intermediate-mass asymptotic giant branch stars; to massive and very massive stars, both their Wolf–Rayet winds and their final core-collapse supernovae (CCSN); and the ejecta from novae, the explosions that occur on the surface of a white dwarf accreting material from a stellar companion. Several reactions affect the production of 26Al in these astrophysical objects, including (but not limited to) 25Mg(p, γ)26Al, 26Al(p, γ)27Si, and 26Al(n, p/α). Extensive experimental effort has been spent during recent years to improve our understanding of such key reactions. Here we present a summary of the astrophysical motivation for the study of 26Al, a review of its production in the different stellar sites, and a timely evaluation of the currently available nuclear data. We also provide recommendations for the nuclear input into stellar models and suggest relevant, future experimental work.

Published
2023

5. 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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6. Structure of Ca36 under the Coulomb Magnifying Glass

Author

L. Lalanne, O. Sorlin, A. Poves, M. Assié, F. Hammache, S. Koyama, D. Suzuki, F. Flavigny, V. Girard-Alcindor, A. Lemasson, A. Matta, T. Roger, D. Beaumel, Y. Blumenfeld, B. A. Brown, F. De Oliveira Santos, F. Delaunay, N. de Séréville, S. Franchoo, J. Gibelin, J. Guillot, O. Kamalou, N. Kitamura, V. Lapoux, B. Mauss, P. Morfouace, M. Niikura, J. Pancin, T. Y. Saito, C. Stodel, and J-C. Thomas

Subjects
General Physics and Astronomy
Published
2022

7. γ-ray emission in proton-induced nuclear reactions on natC and Mylar targets over the incident energy range, E = 30 – 200 MeV. Astrophysical implications

Author

Y. Rahma, S. Ouichaoui, J. Kiener, E.A. Lawrie, J.J. Lawrie, V. Tatischeff, A. Belhout, D. Moussa, W. Yahia-Cherif, H. Benhabiles-Mezhoud, T.D. Bucher, T.R.S. Dinoko, A. Chafa, J.L. Conradie, S. Damache, M. Debabi, I. Deloncle, J.L. Easton, M. Fouka, C. Hamadache, F. Hammache, P. Jones, B.V. Kheswa, N.A. Khumalo, T. Lamula, S.N.T. Majola, J. Ndayishimye, D. Negi, S.P. Noncolela, S. Ouziane, P. Papka, S. Peterson, M. Kumar Raju, V. Ramanathan, B.M. Rebeiro, N. de Séréville, J.F. Sharpey-Schafer, O. Shirinda, M. Wiedeking, and S. Wyngaardt

Subjects
Nuclear and High Energy Physics
Published
2023

8. New narrow resonances observed in the unbound nucleus F15

Author

V. Girard-Alcindor, A. Mercenne, I. Stefan, F. de Oliveira Santos, N. Michel, M. Płoszajczak, M. Assié, A. Lemasson, E. Clément, F. Flavigny, A. Matta, D. Ramos, M. Rejmund, J. Dudouet, D. Ackermann, P. Adsley, M. Assunção, B. Bastin, D. Beaumel, G. Benzoni, R. Borcea, A. J. Boston, D. Brugnara, L. Cáceres, B. Cederwall, I. Celikovic, V. Chudoba, M. Ciemala, J. Collado, F. C. L. Crespi, G. D'Agata, G. De France, F. Delaunay, C. Diget, C. Domingo-Pardo, J. Eberth, C. Fougères, S. Franchoo, F. Galtarossa, A. Georgiadou, J. Gibelin, S. Giraud, V. González, N. Goyal, A. Gottardo, J. Goupil, S. Grévy, V. Guimaraes, F. Hammache, L. J. Harkness-Brennan, H. Hess, N. Jovančević, D. S. Judson Oliver, O. Kamalou, A. Kamenyero, J. Kiener, W. Korten, S. Koyama, M. Labiche, L. Lalanne, V. Lapoux, S. Leblond, A. Lefevre, C. Lenain, S. Leoni, H. Li, A. Lopez-Martens, A. Maj, I. Matea, R. Menegazzo, D. Mengoni, A. Meyer, B. Million, B. Monteagudo, P. Morfouace, J. Mrazek, M. Niikura, J. Piot, Zs. Podolyak, C. Portail, A. Pullia, B. Quintana, F. Recchia, P. Reiter, K. Rezynkina, T. Roger, J. S. Rojo, F. Rotaru, M. D. Salsac, A. M. Sánchez Benítez, E. Sanchis, M. Şenyigit, N. de Séréville, M. Siciliano, J. Simpson, D. Sohler, O. Sorlin, M. Stanoiu, C. Stodel, D. Suzuki, C. Theisen, D. Thisse, J. C.Thomas, P. Ujic, J. J. Valiente-Dobón, and M. Zielińska

Published
2022

11. Neutron-proton pairing in the N=Z radioactive fp-shell nuclei $^{56}$Ni and $^{52}$Fe probed by pair transfer

Author

B. Le Crom, M. Assié, Y. Blumenfeld, J. Guillot, H. Sagawa, T. Suzuki, M. Honma, N.L. Achouri, B. Bastin, R. Borcea, W.N. Catford, E. Clément, L. Cáceres, M. Caamaño, A. Corsi, G. De France, F. Delaunay, N. De Séréville, B. Fernandez-Dominguez, M. Fisichella, S. Franchoo, A. Georgiadou, J. Gibelin, A. Gillibert, F. Hammache, O. Kamalou, A. Knapton, V. Lapoux, S. Leblond, A.O. Macchiavelli, F.M. Marqués, A. Matta, L. Ménager, P. Morfouace, N.A. Orr, J. Pancin, X. Pereira-Lopez, L. Perrot, J. Piot, E. Pollacco, D. Ramos, T. Roger, F. Rotaru, A.M. Sánchez-Benítez, M. Sénoville, O. Sorlin, M. Stanoiu, I. Stefan, C. Stodel, D. Suzuki, J.-C. Thomas, M. Vandebrouck, 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), 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), 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), 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
Nuclear and High Energy Physics, Nuclear Theory, Direct reactions, FOS: Physical sciences, Radioactive beam, Neutron-proton pairing, 22 Física, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Cooper pairs
Abstract

The isovector and isoscalar components of neutron-proton pairing are investigated in the N=Z unstable nuclei of the \textit{fp}-shell through the two-nucleon transfer reaction (p,$^3$He) in inverse kinematics. The combination of particle and gamma-ray detection with radioactive beams of $^{56}$Ni and $^{52}$Fe, produced by fragmentation at the GANIL/LISE facility, made it possible to carry out this study for the first time in a closed and an open-shell nucleus in the \textit{fp}-shell. The transfer cross-sections for ground-state to ground-state (J=0$^+$,T=1) and to the first (J=1$^+$,T=0) state were extracted for both cases together with the transfer cross-section ratios $\sigma$(0$^+$,T=1) /$\sigma$(1$^+$,T=0). They are compared with second-order distorted-wave born approximation (DWBA) calculations. The enhancement of the ground-state to ground-state pair transfer cross-section close to mid-shell, in $^{52}$Fe, points towards a superfluid phase in the isovector channel. For the "deuteron-like" transfer, very low cross-sections to the first (J=1$^+$,T=0) state were observed both for \Ni\phe\, and \Fe\phe\, and are related to a strong hindrance of this channel due to spin-orbit effect. No evidence for an isoscalar deuteron-like condensate is observed., Comment: 7 pages, 4 figures

Published
2022

12. Structure of ^{36}Ca under the Coulomb Magnifying Glass

Author

L, Lalanne, O, Sorlin, A, Poves, M, Assié, F, Hammache, S, Koyama, D, Suzuki, F, Flavigny, V, Girard-Alcindor, A, Lemasson, A, Matta, T, Roger, D, Beaumel, Y, Blumenfeld, B A, Brown, F De Oliveira, Santos, F, Delaunay, N, de Séréville, S, Franchoo, J, Gibelin, J, Guillot, O, Kamalou, N, Kitamura, V, Lapoux, B, Mauss, P, Morfouace, M, Niikura, J, Pancin, T Y, Saito, C, Stodel, and J-C, Thomas

Abstract

Detailed spectroscopy of the neutron-deficient nucleus ^{36}Ca was obtained up to 9 MeV using the ^{37}Ca(p,d)^{36}Ca and the ^{38}Ca(p,t)^{36}Ca transfer reactions. The radioactive nuclei, produced by the LISE spectrometer at GANIL, interacted with the protons of the liquid hydrogen target CRYPTA, to produce light ejectiles (the deuteron d or triton t) that were detected in the MUST2 detector array, in coincidence with the heavy residues identified by a zero-degree detection system. Our main findings are (i) a similar shift in energy for the 1_{1}^{+} and 2_{1}^{+} states by about -250 keV, as compared with the mirror nucleus ^{36}S; (ii) the discovery of an intruder 0_{2}^{+} state at 2.83(13) MeV, which appears below the first 2^{+} state, in contradiction with the situation in ^{36}S; and (iii) a tentative 0_{3}^{+} state at 4.83(17) MeV, proposed to exhibit a bubble structure with two neutron vacancies in the 2s_{1/2} orbit. The inversion between the 0_{2}^{+} and 2_{1}^{+} states is due to the large mirror energy difference (MED) of -516(130) keV for the former. This feature is reproduced by shell model calculations, using the sd-pf valence space, predicting an almost pure intruder nature for the 0_{2}^{+} state, with two protons (neutrons) being excited across the Z=20 magic closure in ^{36}Ca (^{36}S). This mirror system has the largest MEDs ever observed, if one excludes the few cases induced by the effect of the continuum.

Published
2021

13. The $$^{27}\hbox {Al}(\hbox {p},\alpha )^{24}\hbox {Mg}$$ reaction at astrophysical energies studied by means of the Trojan Horse Method applied to the $$^2\hbox {H}(^{27}\hbox {Al},\alpha ^{24}\hbox {Mg})\hbox {n}$$ reaction

Author

G. Manicò, M. L. Sergi, E. Chávez, R. Alba, J. Mrazek, G. D’Agata, A. Cvetinović, S. Hayakawa, Fairouz Hammache, G. G. Kiss, T. Parascandolo, Luis Acosta, K. Gaitán De Los Rios, Domenico Santonocito, Roberta Spartà, Catalin Matei, Silvio Cherubini, G. G. Rapisarda, Sara Palmerini, Livio Lamia, A. Tumino, T. Petruse, D. Pierroutsakou, M. Mazzocco, R. G. Pizzone, V. Burjan, M. La Commara, N. de Séréville, M. La Cognata, Zsolt Fülöp, Marisa Gulino, P. Figuera, G. L. Guardo, H. Yamaguchi, A. Di Pietro, S. Romano, and C. Maiolino

Subjects
Physics, Reaction rate, Potential impact, Hydrogen, chemistry, Analytical chemistry, General Physics and Astronomy, chemistry.chemical_element, Nuclear fusion, Production (computer science), Energy (signal processing)
Abstract

The $$^{27}\hbox {Al}(\hbox {p},\alpha )^{24}\hbox {Mg}$$ 27 Al ( p , α ) 24 Mg reaction, which drives the destruction of $$^{27}$$ 27 Al and the production of $$^{24}\hbox {Mg}$$ 24 Mg in stellar hydrogen burning, has been investigated via the Trojan Horse Method (THM), by measuring the $$^2\hbox {H}(^{27}\hbox {Al},\alpha ^{24}\hbox {Mg})\hbox {n}$$ 2 H ( 27 Al , α 24 Mg ) n three-body reaction. The experiment covered a broad energy range ($$E_\mathrm{c.m.}\le \,1.5\,\hbox {MeV}$$ E c . m . ≤ 1.5 MeV ), aiming to investigate those of interest for astrophysics. The results confirm the THM as a valuable technique for the experimental study of fusion reactions at very low energies and suggest the presence of a rich pattern of resonances in the energy region close to the Gamow window of stellar hydrogen burning (70–120 keV), with potential impact on astrophysics. To estimate such an impact a second run of the experiment is needed, since the background due the three-body reaction hampered to collect enough data to resolve the resonant structures and extract the reaction rate.

Published
2021

14. Probing nuclear forces beyond the nuclear drip line: the cases of $^{16}$F and $^{15}$F: A Tribute to Mahir Hussein

Author

L. Caceres, A.M. Sánchez Benítez, Igor T. Čeliković, A. Matta, D. Verney, F. Rotaru, Valdir Guimaraes, P. Adsley, O. Sorlin, J. Guillot, T. Roger, C. Portail, V. Girard-Alcindor, I. Matea, A. Georgiadou, C. Petrone, D. Pantelica, R. Borcea, D. Suzuki, O. Kamalou, V. Lapoux, Megumi Niikura, I. Stefan, J. Piot, F. Flavigny, G. D’Agata, F. de Oliveira Santos, M. Ciemala, V. Tatischeff, V. Chudoba, L. Lalanne, C. Stodel, J. C. Thomas, N. Goyal, M. Stanoiu, C. Fougeres, S. Grévy, F. Negoita, N. de Séréville, L. Perrot, G. Dumitru, M. Assie, A. Meyer, J. C. Angelique, Marlete Assunção, Nicolas Michel, F. Hammache, D. Beaumel, S. Franchoo, Predrag Ujić, Dieter Ackermann, Shoko Koyama, F. de Grancey, J. Kiener, E. Berthoumieux, P. Morfouace, J. Mrazek, K. Subotic, 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), 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 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, media_common.quotation_subject, Hadron, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Asymmetry, Excited state, 0103 physical sciences, Nuclear force, Mirror nuclei, Atomic physics, 010306 general physics, Wave function, Nuclear Experiment, media_common
Abstract

The unbound proton-rich nuclei $$^{16}$$ F and $$^{15}$$ F are investigated experimentally and theoretically. Several experiments using the resonant elastic scattering method were performed at GANIL with radioactive beams to determine the properties of the low lying states of these nuclei. Strong asymmetry between $$^{16}$$ F– $$^{16}$$ N and $$^{15}$$ F– $$^{15}$$ C mirror nuclei is observed. The strength of the $$nucleon-nucleon$$ effective interaction involving the loosely bound proton in the $$s_{1/2}$$ orbit is significantly modified with respect to their mirror nuclei $$^{16}$$ N and $$^{15}$$ C. The reduction of the effective interaction is estimated by calculating the interaction energies with a schematic zero-range force. It is found that, after correcting for the effects due to changes in the radial distribution of the single-particle wave functions, the mirror symmetry of the $$n-p$$ interaction is preserved between $$^{16}$$ F and $$^{16}$$ N, while a difference of 63% is measured between the $$p-p$$ versus $$n-n$$ interactions in the second excited state of $$^{15}$$ F and $$^{15}$$ C nuclei. Several explanations are proposed.

Published
2021

15. Evaluation of the N13(α,p)O16 thermonuclear reaction rate and its impact on the isotopic composition of supernova grains

Author

D. Beaumel, Fairouz Hammache, L. Audouin, M. G. Pellegriti, Marco Pignatari, Richard Longland, T. Lawson, S. Fortier, Vincent Tatischeff, A. Lefebvre-Schuhl, Anne Meyer, Alison Laird, N. de Séréville, Jürgen Kiener, and M. Stanoiu

Subjects
Physics, 010308 nuclear & particles physics, Monte Carlo method, chemistry.chemical_element, Context (language use), 7. Clean energy, 01 natural sciences, Reaction rate, Nuclear physics, Supernova, Stars, chemistry, 13. Climate action, 0103 physical sciences, Born approximation, 010306 general physics, Stellar evolution, Helium
Abstract

Background: It has been recently suggested that hydrogen ingestion into the helium shell of massive stars could lead to high C13 and N15 excesses when the shock of a core-collapse supernova passes through its helium shell. This prediction questions the origin of extremely high C13 and N15 abundances observed in rare presolar SiC grains which is usually attributed to classical novae. In this context the N13(α,p)O16 reaction plays an important role since it is in competition with N13β+ decay to C13. Purpose: The N13(α,p)O16 reaction rate used in stellar evolution calculations comes from the Caughlan and Fowler compilation with very scarce information on the origin of this rate and with no associated uncertainty. The goal of this work is to provide a recommended N13(α,p)O16 reaction rate, based on available experimental data, with a meaningful statistical uncertainty. Method: Unbound nuclear states in the F17 compound nucleus were studied using the spectroscopic information of the analog states in O17 nucleus that were measured at the Tandem-Alto facility using the C13(Li7,t)O17 α-particle-transfer reaction. The α-particle spectroscopic factors were derived using a finite-range distorted-wave Born approximation analysis. This spectroscopic information was used to calculate a recommended N13(α,p)O16 reaction rate with meaningful uncertainty using a Monte Carlo approach. Results: The N13(α,p)O16 reaction rate from the present work is found to be within a factor of two of the previous evaluation in the temperature range of interest, with a typical uncertainty of a factor ≈2-3. The source of this uncertainty has been identified to come from the three main contributing resonances at Erc.m.=221, 741, and 959 keV. This new error estimation translates to an overall uncertainty in the C13 production of a factor of 50 when using the lower and upper reaction rates in the conditions relevant for the N13(α,p)O16 activation. Conclusions: The main source of uncertainty on the re-evaluated N13(α,p)O16 reaction rate currently comes from the uncertain α-particle width of relevant F17 states.

Published
2020

16. Bayesian analysis of the Zn70(d,He3)Cu69 transfer reaction

Author

P. Morfouace, Richard Longland, Caleb Marshall, and N. de Séréville

Subjects
Physics, Angular momentum, Transfer (group theory), Particle transfer, 010308 nuclear & particles physics, 0103 physical sciences, Bayesian probability, Statistical physics, Nuclear Experiment, 010306 general physics, 01 natural sciences, Nuclear theory
Abstract

Particle transfer reactions provide information on the single-particle structure of nuclei, with the caveat of imperfect reaction theory. In this paper, Bayesian analysis is applied in order to estimate the theoretical uncertainties associated with both the extraction of spectroscopic factors and the assignment of orbital angular momentum values from a pickup reaction. The authors find that these uncertainties are closely tied to experimental conditions, and discuss how to reduce their influence on future measurements.

Published
2020

17. Study of the neutron induced reaction 17O(n,α)14C at astrophysical energies via the Trojan Horse Method

Author

G. Manicò, G. D’Agata, G. L. Guardo, N. de Séréville, C. Spitaleri, S. Romano, D. Lattuada, M. Lattuada, A. A. Oliva, Fairouz Hammache, Roberta Spartà, M. La Commara, M. L. Sergi, A. Tumino, Maria Letizia Pumo, S. Palmerini, M. Mazzocco, G. G. Rapisarda, I. Indelicato, S. Cherubini, S. Messina, S. Hayakawa, M. La Cognata, M. Gulino, P. Figuera, A. Cvetinović, Neven Soić, A. Di Pietro, R. G. Pizzone, L. Lamia, 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), 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), 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, Range (particle radiation), 010308 nuclear & particles physics, Abundance (chemistry), QC1-999, Trojan horse, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Iron peak, 01 natural sciences, 7. Clean energy, Nuclear physics, Stars, 13. Climate action, Nucleosynthesis, 0103 physical sciences, Neutron, Center of mass, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010306 general physics
Abstract

Neutron induced reactions are fundamental for the nucleosynthesis of elements in the universe. Indeed, to correctly study the reactions involved in the well-known s-process in stars, which produce about half of the elements beyond the iron peak, it is mandatory to know the neutron abundance available in those stars. The 17O(n, a)14C reaction is one of the so-called “neutron poisons” for the pro- cess and it could play an important role in the balance of the neutron abundance. The reaction is therefore investigated in the energy range of astrophysical inter- est between 0 and 350 keV in the center of mass by applying the Trojan Horse Method to the three body reaction 2H(17O, a14C)H.

Published
2020

18. 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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19. Evaluation of the N 13 ( α , p ) O 16

Author

A. Meyer, N. de Séréville, A. M. Laird, F. Hammache, R. Longland, T. Lawson, M. Pignatari, L. Audouin, D. Beaumel, S. Fortier, J. Kiener, A. Lefebvre-Schuhl, M. G. Pellegriti, M. Stanoiu, V. Tatischeff

Published
2020
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20. The MUGAST-AGATA-VAMOS campaign: Set-up and performances

Author

D. Mengoni, C. Nicolle, F. Flavigny, F. Noury, N. de Séréville, J.S. Rojo, L. Ménager, J. Goupil, A. Goasduff, F. de Oliveira, F. Hammache, M. Assié, A. Korichi, W. N. Catford, J. Dudouet, L. Lalanne, E. Rindel, L. Vatrinet, Y. Blumenfeld, G. Frémont, V. Girard-Alcindor, D. Ramos, D. Brugnara, A. Matta, B. Fernández-Domínguez, A. Raggio, F. Legruel, F. Didierjean, S. Leblond, P. R. John, A. Lefevre, C. Fougères, M. Stanoiu, C. Lenain, A. Gottardo, I. Zanon, I. Stefan, A. Giret, E. Rauly, C. Aa. Diget, R. Borcea, Franck Delaunay, J. Casal, F. Galtarossa, M. Siciliano, K. Rezynkina, Didier Beaumel, B. Million, Eric Clément, A. Lemasson, 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), 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 Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-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, 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Photon, FOS: Physical sciences, Kinematics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Spectrometer, Particle identification, symbols.namesake, Optics, 0103 physical sciences, Solid-state detectors, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Electronics, Nuclear Experiment (nucl-ex), 010306 general physics, Spectroscopy, Nuclear Experiment, Instrumentation, Physics, 010308 nuclear & particles physics, business.industry, Direct nuclear reactions, Triple coincidences, Instrumentation and Detectors (physics.ins-det), symbols, AGATA, business, Doppler effect
Abstract

The MUGAST-AGATA-VAMOS set-up at GANIL combines the MUGAST highly-segmented silicon array with the state-of-the-art AGATA array and the large acceptance VAMOS spectrometer. The mechanical and electronics integration copes with the constraints of maximum efficiency for each device, in particular {\gamma}-ray transparency for the silicon array. This complete set-up offers a unique opportunity to perform exclusive measurements of direct reactions with the radioactive beams from the SPIRAL1 facility. The performance of the set-up is described through its commissioning and two examples of transfer reactions measured during the campaign. High accuracy spectroscopy of the nuclei of interest, including cross-sections and angular distributions, is achieved through the triple-coincidence measurement. In addition, the correction from Doppler effect of the {\gamma}-ray energies is improved by the detection of the light particles and the use of two-body kinematics and a full rejection of the background contributions is obtained through the identification of heavy residues. Moreover, the system can handle high intensity beams (up to 108 pps). The particle identification based on the measurement of the time-of-flight between MUGAST and VAMOS and the reconstruction of the trajectories is investigated., Comment: 13 pages, 18 figures

Published
2021

21. Advances in the Direct Study of Carbon Burning in Massive Stars

Author

R. Shearman, G. Fruet, J. Lesrel, D. Curien, J. Nippert, S. Courtin, R. Canavan, D. G. Jenkins, A. S. Brown, S. Della Negra, D. Montanari, Zs. Podolyák, Arnd Meyer, P. H. Regan, M. Richer, L. Morris, N. de Séréville, M. Moukaddam, E. Charon, W. N. Catford, F. Hammache, M. Rudigier, Gavin Lotay, C. Stodel, J. Duprat, M. Heine, P. Adsley, Isabelle Ribaud, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-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), 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), 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)-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), 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
[PHYS]Physics [physics], Physics, Explosive material, Extrapolation, Gamma ray, Nuclear structure, General Physics and Astronomy, Coulomb barrier, Physique [physics]/Physique [physics], 01 natural sciences, 7. Clean energy, Nuclear physics, Stars, Orders of magnitude (time), 13. Climate action, 0103 physical sciences, Nuclear fusion, Nuclear Experiment, 010306 general physics, Nuclear Physics
Abstract

The 12C + 12C fusion reaction plays a critical role in the evolution of massive stars and also strongly impacts various explosive astrophysical scenarios. The presence of resonances in this reaction at energies around and below the Coulomb barrier makes it impossible to carry out a simple extrapolation down to the Gamow window—the energy regime relevant to carbon burning in massive stars. The 12C + 12C system forms a unique laboratory for challenging the contemporary picture of deep sub-barrier fusion (possible sub-barrier hindrance) and its interplay with nuclear structure (sub-barrier resonances). Here, we show that direct measurements of the 12C + 12C fusion cross section may be made into the Gamow window using an advanced particle-gamma coincidence technique. The sensitivity of this technique effectively removes ambiguities in existing measurements made with gamma ray or charged-particle detection alone. The present cross-section data span over 8 orders of magnitude and support the fusion-hindrance model at deep sub-barrier energies.

Published
2019

22. Experimental Study of the ${^{30}}{\text {P}({\text {p}}}{,}{\gamma })^{31}\text {S}$ Reaction in Classical Novae

Author

A. Georgiadou, A. Gottardo, Alison Laird, N. Oulebsir, Á. M. Sánchez Benítez, F. Flavigny, J. Kiener, A. Coc, F. de Oliveira, J. Riley, D. Beaumel, M. MacCormick, L. Olivier, J. Guillot, L. Grassi, I. Matea, N. Hubbard, Giuseppe D’Agata, C. Delafosse, K. Béroff, Valdir Guimaraes, L. Perrot, S. P. Fox, P. Adsley, N. de Séréville, C. Portail, F. Hammache, A. Meyer, Anuj Parikh, Alessandro Luiz Lara, V. Tatischeff, M. Assié, T. Id Barkach, Marlete Assunção, I. Stefan, B. Bastin, 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 des Sciences Moléculaires d'Orsay (ISMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), and Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Reaction rate, Particle physics, 010308 nuclear & particles physics, 0103 physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, 7. Clean energy
Abstract

International audience; The$^{30}$ P(p, $\gamma $ )$^{31}$ S reaction is one of the few remaining reactions whose rate uncertainty has a strong impact on classical novae model predictions. To reduce the nuclear uncertainties associated to this reaction, we measured the$^{31}$ P($^{3}$ He,t)$^{31}$ S reaction at the ALTO facility. Simultaneous detection of the triton and proton decays from the populated resonances will provide the proton branching ratios. The astrophysical context of this work, the current situation of the$^{30}$ P(p, $\gamma $ )$^{31}$ S reaction rate, the experimental set-up and the analysis of the single and coincidence events will be presented.

Published
2018

23. High-resolution study of levels in the astrophysically important nucleus Mg26 and resulting updated level assignments

Author

P. Adsley, Anne Meyer, H.-F. Wirth, Ralf Hertenberger, J. W. Brümmer, R. Neveling, Thomas Faestermann, D. Seiler, Fairouz Hammache, N. de Séréville, and S. P. Fox

Subjects
Physics, Proton, 010308 nuclear & particles physics, Gamma ray, Nuclear data, Inelastic scattering, 01 natural sciences, Resonance (particle physics), Nuclear physics, Deuterium, Excited state, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics
Abstract

Background: The Ne-22(alpha, n)Mg-25 reaction is an important source of neutrons for the s-process. Direct measurement of this reaction and the competing Ne-22(alpha,gamma)Mg-26 reaction are challenging due to the gaseous nature of both reactants, the low cross section and the experimental challenges of detecting neutrons and high-energy gamma rays. Detailed knowledge of the resonance properties enables the rates to be constrained for s-process models. Purpose: Previous experimental studies have demonstrated a lack of agreement in both the number and excitation energy of levels in Mg-26. To try to resolve the disagreement between different experiments, proton and deuteron inelastic scattering from Mg-26 have been used to identify excited states. Method: Proton and deuteron beams from the tandem accelerator at theMaier-Leibnitz Laboratorium at Garching, Munich, were incident upon enriched (MgO)-Mg-26 targets. Scattered particles were momentum-analyzed in the Q3D magnetic spectrograph and detected at the focal plane. Results: Reassignments of states around E-x = 10.8-10.83 MeV in Mg-26 suggested in previous works have been confirmed. In addition, new states in Mg-26 have been observed, two below and two above the neutron threshold. Up to six additional states above the neutron threshold may have been observed compared to experimental studies of neutron reactions on Mg-25, but some or all of these states may be due to Mg-24 contamination in the target. Finally, inconsistencies between measured resonance strengths and some previously accepted J(pi) assignments of excited Mg-26 states have been noted. Conclusion: There are still a large number of nuclear properties in Mg-26 that have yet to be determined and levels that are, at present, not included in calculations of the reaction rates. In addition, some inconsistencies between existing nuclear data exist that must be resolved in order for the reaction rates to be properly calculated.

Published
2018

24. The STELLA Apparatus for Particle-Gamma Coincidence Fusion Measurements with Nanosecond Timing

Author

F. Haas, G. Heitz, D. G. Jenkins, P. Adsley, P. Dené, M. Richer, C. Stodel, L. Morris, M. Krauth, C. Beck, S. Courtin, D. Montanari, P. H. Regan, J. Lesrel, L. Charles, M. Heine, F. Hammache, M. Rudigier, G. Fruet, Zs. Podolyák, A. Meyer, S. Della Negra, N. de Séréville, D. Curien, 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), Université de Strasbourg (UNISTRA), 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 National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien ( IPHC ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Strasbourg ( UNISTRA ), Université de Strasbourg ( UNISTRA ), 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 ), 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
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Proton, Aucun, Rotating target, FOS: Physical sciences, 01 natural sciences, Optics, Coincident, 0103 physical sciences, Coincidence technique, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Fusion, Instrumentation, [ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Physics, 010308 nuclear & particles physics, business.industry, Gamma ray, Alpha particle, Instrumentation and Detectors (physics.ins-det), Nanosecond, Charged particle, Proton-alpha separation, LaBr3 self-calibration, Particle, LaBr 3 self-calibration, business, Beam (structure)
Abstract

The STELLA (STELlar LAboratory) experimental station for the measurement of deep sub-barrier light heavy-ion fusion cross sections has been installed at the Androm\`{e}de accelerator at the Institut de Physique Nucl\'{e}aire, Orsay (France). The setup is designed for the direct experimental determination of heavy-ion fusion cross sections as low as tens of picobarn. The detection concept is based on the coincident measurement of emitted gamma rays with the UK FATIMA (FAst TIMing Array) and evaporated charged particles using a silicon detector array. Key developments relevant to reaching the extreme sub-barrier fusion region are a rotating target mechanism to sustain beam intensities above 10$\mu$A, an ultra-high vacuum to prevent carbon built-up and gamma charged-particle timing in the order of nanoseconds sufficient to separate proton and alpha particles., Comment: 18 pages, 11 figures

Published
2018
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25. Study of key resonances in the $^{30}$P(p,γ)$^{31}$S reaction in classical novae

Author

F. Flavigny, L. Olivier, A. Alellara, B. Bastin, L. Perrot, J. Riley, L. Grassi, F. de Oliveira, T. Id Barkach, J. Guillot, Alison Laird, J. Kiener, Á. M. Sánchez Benítez, D. Beaumel, V. Tatischeff, Marlete Assunção, Anuj Parikh, S. P. Fox, A. Meyer, P. Adsley, Giuseppe D’Agata, C. Portail, A. Gottardo, F. Hammache, I. Matea, M. Assié, N. Oulebsir, A. Georgiadou, C. Delafosse, M. MacCormick, N. Hubbard, Valdir Guimaraes, A. Coc, N. de Séréville, I. Stefan, K. Béroff, 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 de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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 des Sciences Moléculaires d'Orsay (ISMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), 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), and Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Proton, 010308 nuclear & particles physics, QC1-999, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Coincidence, Nuclear physics, Reaction rate, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Excited state, 0103 physical sciences, 010303 astronomy & astrophysics
Abstract

Among reactions with strong impact on classical novae model predictions, 30P(p,γ)31S is one of the few remained that are worthy to be measured accurately, because of their rate uncertainty, as like as 18F(p,α)15O and 25Al(pγ)26Si. To reduce the nuclear uncertainties associated to this reaction, we performed an experiment at ALTO facility of Orsay using the 31P(3He,t)31S reaction to populate 31S excited states of astrophysical interest and detect in coincidence the protons coming from the decay of the populated states in order to extract the proton branching ratios. After a presentation of the astrophysical context of this work, the current situation of the 30P(p,γ)31S reaction rate will be discussed. Then the experiment set-up of this work and the analysis of the single events will be presented.

Published
2017

26. First measurement of the S34(p,γ)Cl35 reaction rate through indirect methods for presolar nova grains

Author

Ralf Hertenberger, C. J. Barton, H.-F. Wirth, T. Faestermann, Anuj Parikh, S. Gillespie, M. Williams, N. de Séréville, J. Riley, and Jordi José

Subjects
Physics, Range (particle radiation), 010308 nuclear & particles physics, Presolar grains, Monte Carlo method, Nova (laser), Astrophysics, Type II supernova, 01 natural sciences, Nuclear physics, Reaction rate, Isotopic ratio, 13. Climate action, Nucleosynthesis, 0103 physical sciences, 010306 general physics
Abstract

Sulphur isotopic ratio measurements may help to establish the astrophysical sites in which certain presolar grains were formed. Nova model predictions of the S-34/S-32 ratio are, however, unreliable due to the lack of an experimental S-34(p,gamma)Cl-35 reaction rate. To this end, we have measured the S-34(He-3,d)Cl-35 reaction at 20 MeV using a high resolution quadrupole-dipole-dipole-dipolemagnetic spectrograph. Twenty-two levels over 6.2 MeV < E-x (Cl-35) < 7.4 MeV were identified, ten of which were previously unobserved. Proton-transfer spectroscopic factors have been measured for the first time over the energy range relevant for novae. With this new spectroscopic information a new S-34(p,gamma)Cl-35 reaction rate has been determined using a Monte Carlo method. Hydrodynamic nova model calculations have been performed using this new reaction rate. These models show that remaining uncertainties in the S-34(p,gamma) rate affect nucleosynthesis predictions by less than a factor of 1.4, and predict a S-34/S-32 isotopic ratio of 0.014-0.017. Since recent type II supernova models predict S-34/S-32 = 0.026-0.053, the S-34/S-32 isotopic ratio may be used, in conjunction with other isotopic signatures, to distinguish presolar grains from oxygen-neon nova and type II supernova origin. Our results address a key nuclear physics uncertainty on which recent considerations discounting the nova origin of several grains depend.

Published
2017

27. Cross section measurements in the $^{12}$C+$^{12}$C system

Author

S. Della Negra, Sergio Almaraz-Calderon, Oliver S. Kirsebom, B. Bucher, C. L. Jiang, R. V. F. Janssens, Anne Meyer, Rashi Talwar, X.D. Tang, John P. Greene, B. B. Back, M. Heine, G. Fruet, X. Fang, Fairouz Hammache, D. J. Henderson, S. A. Kuvin, P. Adsley, Catherine Deibel, M. Rudigier, Kalle Auranen, S. Zhu, S. Courtin, M. Albers, D. Bourgin, M. P. Carpenter, Martín Alcorta, D. Seweryniak, Daniel Santiago-Gonzalez, D. Montanari, F. Haas, B. P. Kay, Calem Hoffman, P. H. Regan, D. G. Jenkins, P. F. Bertone, J. Sethi, C. Stodel, Claudio Ugalde, A. Lefebvre-Schuhl, J. Lesrel, A. D. Ayangeakaa, Clayton Dickerson, K. E. Rehm, B. DiGiovine, L. Morris, N. de Séréville, R. C. Pardo, Melina Avila, T. Lauritsen, S. Bottoni, S. T. Marley, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-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), 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 de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), 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), 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 de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, 010308 nuclear & particles physics, QC1-999, Measure (physics), Aucun, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Coincidence, law.invention, Nuclear physics, Ignition system, Cross section (physics), chemistry, 13. Climate action, law, 0103 physical sciences, Nuclear astrophysics, Nuclear fusion, 010306 general physics, Carbon
Abstract

International audience; The 12C+12C fusion reaction is one of the most important for nuclear astrophysics since it determines the carbon ignition in stellar environments. Two experiments which make use of the gamma-particle coincidence technique to measure the 12C+12C S-factors at deep sub barrier energies are discussed. Results are presented showing a decrease of the S-factor below Ec.m. = 3 MeV.

Published
2017

28. Spectroscopy of Fe61 via the neutron transfer reaction H2(Fe60,p)Fe*61

Author

S. Giron, F. Hammache, N. de Séréville, P. Roussel, J. Burgunder, M. Moukaddam, D. Beaumel, L. Caceres, G. Duchêne, E. Clément, B. Fernandez-Dominguez, F. Flavigny, G. de France, S. Franchoo, D. Galaviz-Redondo, L. Gasques, J. Gibelin, A. Gillibert, S. Grevy, J. Guillot, M. Heil, J. Kiener, V. Lapoux, F. Maréchal, A. Matta, I. Matea, L. Nalpas, J. Pancin, L. Perrot, A. Obertelli, R. Raabe, J. A. Scarpaci, K. Sieja, O. Sorlin, I. Stefan, C. Stodel, M. Takechi, J. C. Thomas, and Y. Togano

Subjects
Physics, Photon, Silicon, 010308 nuclear & particles physics, chemistry.chemical_element, 01 natural sciences, 7. Clean energy, Charged particle, Cross section (physics), chemistry, 0103 physical sciences, Bound state, Neutron, Atomic physics, 010306 general physics, Adiabatic process, Spectroscopy
Abstract

The direct component of the 60Fe(n,γ)61Fe cross section was investigated by populating the bound states of the 61Fe nucleus through the (d,pγ) transfer reaction in inverse kinematics using a radioactive beam of 60Fe at 27A MeV. The experiment was performed at GANIL using the MUST2 array and an annular double-sided silicon strip detector for the detection of the light charged particle in coincidence with the photons measured in the EXOGAM γ-ray detectors. For the first time, the spectroscopic factors of the first 3/2−, 5/2−, 1/2−, and 9/2+ states of 61Fe were deduced experimentally from an adiabatic distorted wave approximation analysis of the data. The obtained results show a very good agreement with the shell-model predictions. The calculated direct component of the (n,γ) cross section was found negligible and of about 2% of the total, indicating a dominant resonant component.

Published
2017

29. Pulse-shape discrimination in NE213 liquid scintillator detectors

Author

S. Tropea, M. Assié, A. Foti, Daniele Carbone, Manuela Cavallaro, F. Azaiez, C. Boiano, M. De Napoli, N. de Séréville, C. Agodi, Roberto Linares, D. Nicolosi, J. A. Scarpaci, Francesco Cappuzzello, M. Bondì, 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), and Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM)

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Gaussian, Barium fluoride, Detector, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Scintillator, 01 natural sciences, symbols.namesake, chemistry.chemical_compound, Optics, chemistry, 0103 physical sciences, Wide dynamic range, symbols, Neutron detection, Neutron, 010306 general physics, business, Instrumentation, Energy (signal processing)
Abstract

The 16-channel fast stretcher BaFPro module, originally developed for processing signals of Barium Fluoride scintillators, has been modified to make a high performing analog pulse-shape analysis of signals from the NE213 liquid scintillators of the EDEN neutron detector array. The module produces two Gaussian signals, whose amplitudes are proportional to the height of the fast component of the output light and to the total energy deposited into the scintillator, respectively. An in-beam test has been performed at INFN-LNS (Italy) demonstrating a low detection threshold, a good pulse-shape discrimination even at low energies and a wide dynamic range for the measurement of the neutrons energy.

Published
2013

30. Rearrangement of valence neutrons in the neutrinoless double- β decay of Xe136

Author

Stuart Szwec, F. Hammache, N. de Séréville, J. P. Entwisle, D. K. Sharp, J. F. Smith, S. J. Freeman, Thomas Elias Cocolios, Valdir Guimaraes, I. Stefan, P. P. McKee, E. Parr, C. Portail, B. P. Kay, J. P. Schiffer, and Liam Gaffney

Subjects
Physics, Semileptonic decay, Valence (chemistry), Proton, 010308 nuclear & particles physics, Nuclear Theory, 7. Clean energy, 01 natural sciences, Nuclear physics, Double beta decay, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Nuclear theory
Abstract

In neutrinoless double-$\ensuremath{\beta}$ decay such as ${}^{136}$Xe to ${}^{136}$Ba, two neutrons become two protons, thus rearranging the occupancy of protons and neutrons in the ground states of the parent and daughter nuclei. From precision measurements of the cross sections of single-neutron adding and -removing reactions, the authors extract the change in ground-state neutron occupancies between ${}^{136}$Xe and ${}^{136}$Ba. Along with recent results on the proton occupancies, the new experimental neutron occupancies disagree with those used in existing theoretical calculations of the rate of this elusive $\ensuremath{\beta}$-decay mode, and provide a \hskip-0.22em \hskip-0.22embasis for improved estimates of the uncertainties for new calculations.

Published
2016

31. Gamma-ray detection with a large silicon detector in the MeV range

Author

G. Brulin, P. Rosier, E. Wanlin, T. Faul, A. Torrento, J-J. Dormard, N. de Séréville, B. Genolini, V. Le Ven, and E. Rauly

Subjects
Physics, Silicon, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Preamplifier, Astrophysics::High Energy Astrophysical Phenomena, Detector, Compton scattering, Gamma ray, chemistry.chemical_element, 01 natural sciences, Capacitance, Noise (electronics), Optics, chemistry, Observatory, 0103 physical sciences, Optoelectronics, 010306 general physics, business
Abstract

The measurement of gamma rays in the 0.3–30 MeV energy range with silicon detectors at room temperature via Compton scattering is being investigated for the next spatial gamma-ray observatory in the MeV band. In this contribution, we show that 60-keV gamma-ray detection with an energy resolution below 10 keV is possible using a 64×64 mm2, 1.5-mm thick, double-sided stripped silicon detector with a charge-sensitive preamplifier made of discrete commercial components. Our study of the noise including the bias circuit and the connection between the detector and the electronics allowed us to design a system able to sustain a leakage current of ∼50 nA/strip and a capacitance of ∼20 pF/strip. These results encourage us to investigate the use of integrated electronics in view of a satellite mission.

Published
2016

32. GAMCOTE: a prototype for an advanced Compton Telescope

Author

N. de Séréville, A.-S. Torrentó, J.-J. Dormard, C. Santos, E. Legay, W. Bertoli, N. Karkour, J. Peyré, J. Kiener, V. Le Ven, C. Hamadache, X. Lafay, O. Limousin, E. Wanlin, E. Rauly, Vincent Tatischeff, N. Dosme, A. Gostojic, D. Linget, R. Oger, B. Genolini, Ph. Rosier, L. Gibelin, Ph. Laurent, G. Brulin, T. Faul, X. Grave, and D. Maier

Subjects
Physics, Photomultiplier, Photon, Calorimeter (particle physics), Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Compton telescope, Astrophysics::Instrumentation and Methods for Astrophysics, Gamma ray, Compton scattering, Astronomy, Gamma-ray astronomy, 01 natural sciences, law.invention, Telescope, Optics, law, 0103 physical sciences, business, 010303 astronomy & astrophysics
Abstract

Astronomy in the MeV gamma-ray band (0.1 - 100 MeV) holds a rich promise for elucidating many fundamental questions concerning the most violent cosmic phenomena. The next generation of gamma-ray space instrument could be a Compton and pair-creation telescope made of two main parts: a silicon tracker optimized for Compton scattering of cosmic gamma rays and a calorimeter that absorbs the scattered photons. We present here the first results of GAMCOTE, a GAMma-ray COmpton TElescope prototype which includes thick double sided silicon strip detectors coupled to a LaBr3:Ce crystal read by a 64 multi-anode photomultiplier tube.

Published
2016

33. Single-particle strength in neutron-richCu69from theZn70(d,He3)Cu69proton pick-up reaction

Author

C. Petrone, P. Morfouace, S. Franchoo, M. Assié, D. R. Napoli, J. Guillot, I. Stefan, F. Azaiez, L. Lefebvre, D. Suzuki, I. Matea, D. Mengoni, D. Testov, C. Borcea, N. de Séréville, B. Le Crom, L. Grassi, M. Stanoiu, R. Borcea, Fairouz Hammache, and Kamila Sieja

Subjects
Physics, Spectrometer, Proton, 010308 nuclear & particles physics, 01 natural sciences, Deuterium, 0103 physical sciences, Particle, Neutron, Born approximation, Atomic physics, 010306 general physics, Beam (structure), Energy (signal processing)
Abstract

We have performed the $^{70}\mathrm{Zn}(d,^{3}\mathrm{He})^{69}\mathrm{Cu}$ proton pick-up reaction in direct kinematics using a deuteron beam at 27 MeV. The outgoing $^{3}\mathrm{He}$ particles were detected at the focal-plane detection system of an Enge split-pole spectrometer. The excitation-energy spectrum was reconstructed up to 7 MeV and spectroscopic factors were obtained after analysis of the angular distributions in the finite-range distorted-wave Born approximation. The results show three new angular distributions for which the $\ensuremath{\pi}{f}_{7/2}$ strength was measured and a lower limit of the centroid is established. State-of-the-art shell-model calculations are performed and predict a $\ensuremath{\pi}{f}_{7/2}$ strength that lies too high in energy in comparison to our experimental results.

Published
2016

34. The Giant Pairing Vibration in Carbon isotopes

Author

N. de Séréville, J. A. Scarpaci, M. Assié, F. Azaiez, Francesco Cappuzzello, C. Agodi, Diana Carbone, Manuela Cavallaro, 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), and Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM)

Subjects
History, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Education, Nuclear physics, 0103 physical sciences, medicine, Neutron detection, Neutron, 010306 general physics, Nuclear Experiment, Physics, Spectrometer, 010308 nuclear & particles physics, Resonance, Computer Science Applications, Vibration, medicine.anatomical_structure, 13. Climate action, Pairing, Atomic physics, Nucleus, Excitation
Abstract

International audience; The (13)C((18)O,(16)O)(15)C and (12)C((18)O,(16)O)(14)C reactions at 84 MeV incident energy were explored up to high excitation energy of the residual nucleus thanks to the use of the MAGNEX spectrometer to detect the ejectiles. In the region above the two-neutron separation energy, a resonance has been observed in both nuclei, attributed to the Giant Pairing Vibration (GPV). The neutron decay of the (15)C resonances, including the GPV, populated via the two- neutron transfer reaction has been studied using an innovative technique, which couples MAGNEX with the EDEN neutron detector array. The data show that the (15)C GPV mainly decays via two-neutron emission.

Published
2016

35. Study of the 26 Al(n,p) 26 Mg and 26 Al(n,α) 23 Na reactions using the 27 Al(p,p') 27 Al inelastic scattering reaction

Author

I. Deloncle, G. Mavilla, B. Le Crom, Fairouz Hammache, C. T. Nsangu, P. Roussel, P. Adsley, Alison Laird, Marine Vandebrouck, S. Ancelin, Vincent Tatischeff, J. Guillot, S. P. Fox, C. Hamadache, I. Stefan, N. Oulebsir, M. Assié, C. J. Barton, L. Perrot, G. Marquinez Duran, S. Benamara, D. Suzuki, P. Morfouace, L. Lefebvre, C. A. Diget, N. de Séréville, Jürgen Kiener, A. Lefebfre-Schuhl, A. Coc, A. M. Sánchez-Benítez, and A. Mutschler

Subjects
Nuclear reaction, Physics, History, 010504 meteorology & atmospheric sciences, Isotope, Radiochemistry, Inelastic scattering, 010502 geochemistry & geophysics, Isotopes of sodium, 01 natural sciences, Computer Science Applications, Education, Nucleosynthesis, Neutron, Alpha decay, Isotopes of magnesium, 0105 earth and related environmental sciences
Abstract

26Al was the first cosmic radioactivity ever detected in the galaxy as well as one of the first extinct radioactivity observed in refractory phases of meteorites. Its nucleosynthesis in massive stars is still uncertain mainly due to the lack of nuclear information concerning the 26Al(n,p)26Mg and 26Al(n,α)23Na reactions. We report on a single and coincidence measurement of the 27Al(p,p’)27Al(p)26Mg and 27Al(p,p’)27Al(α)23Na reactions performed at the Orsay TANDEM facility aiming at the spectroscopy study of 27Al above the neutron threshold. Fourteen states are observed for the first time within 350 keV above the 26Al+n threshold.

Published
2016

37. NPTool: a simulation and analysis framework for low-energy nuclear physics experiments

Author

N. de Séréville, A. Matta, R. Shearman, P Morfouace, F. Flavigny, M. Labiche, 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, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Detector, Monte Carlo method, Experimental data, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, Nuclear physics, Low energy, Workflow, Open source data, 0103 physical sciences, Physics::Accelerator Physics, 010306 general physics, Nuclear Experiment, Radioactive beam
Abstract

International audience; The Nuclear Physics Tool (NPTool) is an open source data analysis and Monte Carlo simulation framework that has been developed for low-energy nuclear physics experiments with an emphasis on radioactive beam experiments. The NPTool offers a unified framework for designing, preparing and analyzing complex experiments employing multiple detectors, each of which may comprise some hundreds of channels. The framework has been successfully used for the analysis and simulation of experiments at facilities including GANIL, RIKEN, ALTO and TRIUMF, using both stable and radioactive beams. This paper details the NPTool philosophy together with an overview of the workflow. The framework has been benchmarked through the comparison of simulated and experimental data for a variety of detectors used in charged particle and gamma-ray spectroscopy.

Published
2016

38. The 20Ne(d,p)21Ne transfer reaction in relation to the s-process abundances

Author

Alison Laird, C. T. Nsangu, N. de Séréville, B. R. Fulton, T. Faestermann, H.-F. Wirth, Anuj Parikh, Ralf Hertenberger, K. Schmitt, A. St. J. Murphy, Richard Longland, J. R. Tomlinson, M. D. Birch, A. Chen, P. Adsley, B. P. Kay, S. Manwell, S. P. Fox, D. Irvine, and Universitat Politècnica de Catalunya. GAA - Grup d'Astronomia i Astrofísica

Subjects
Physics, Astrofísica, History, Física [Àrees temàtiques de la UPC], Metallicity, Nuclear Theory, Astrophysics, Computer Science Applications, Education, Nuclear physics, Stars, Dipole, Deuterium, Quadrupole, Neutron, Atomic physics, s-process, Nuclear Experiment, Excitation, Astrophysics::Galaxy Astrophysics
Abstract

Nuclear Physics in Astrophysics VI (NPA6) , 19–24 May 2013, Lisbon, Portugal A study of the 20Ne(d,p)21Ne transfer reaction was performed using the Quadrupole Dipole Dipole Dipole (Q3D) magnetic spectrograph in Garching, Germany. The experiment probed excitation energies in 21Ne ranging from 6.9 MeV to 8.5 MeV. The aim was to investigate the spectroscopic information of 21Ne within the Gamow window of core helium burning in massive stars. Further information in this region will help reduce the uncertainties on the extrapolation down to Gamow window cross sections of the 17 O(alfa,gamma)21Ne reaction. In low metallicity stars, this reaction has a direct impact on s-process abundances by determining the fate of 16O as either a neutron poison or a neutron absorber. The experiment used a 22-MeV deuteron beam, with intensities varying from 0.5-1 miA, and an implanted target of 20Ne of 7 microg/cm2 in 40 microg/cm2 carbon foils. Sixteen 21Ne peaks have been identified in the Ex = 6.9-8.5 MeV range, of which only thirteen peaks correspond to known states. Only the previously-known Ex = 7.960 MeV state was observed within the Gamow window.

Published
2016

39. Indirect techniques for astrophysical reaction rates determinations

Author

Alison Laird, N. de Séréville, N. Oulebsir, P. Roussel, S. Benamara, I. Stefan, Fairouz Hammache, A. Coc, 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 de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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 reaction, Physics, 010308 nuclear & particles physics, QC1-999, Context (language use), Inelastic scattering, 01 natural sciences, 7. Clean energy, Reaction rate, Nuclear physics, Stars, 13. Climate action, 0103 physical sciences, 010306 general physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Nuclear Experiment
Abstract

International audience; Direct measurements of nuclear reactions of astrophysical interest can be challenging. Alternative experimental techniques such as transfer reactions and inelastic scattering reactions offer the possibility to study these reactions by using stable beams. In this context, I will present recent results that were obtained in Orsay using indirect techniques. The examples will concern various astrophysical sites, from the Big-Bang nucleo synthesis to the production of radioisotopes in massive stars.

Published
2016

40. Indirect study of 19Ne states near the threshold

Author

N. de Séréville, B. Bouzid, Marc Loiselet, Jürgen Kiener, Carmen Angulo, Vincent Tatischeff, A. Coc, Michel Gaelens, P. Figuera, F. de Oliveira Santos, Guido Ryckewaert, Daniel Labar, Alain Ninane, S. Fortier, S. Ouichaoui, P. Demaret, Marlete Assunção, S. Cherubini, F. Hammache, Pierre Leleux, E. Berthoumieux, D. Beaumel, N. Smirnova, Manoel Couder, and A. Lefebvre-Schuhl

Subjects
Physics, Reaction rate, Nuclear reaction, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Scattering, 0103 physical sciences, Atomic physics, 010306 general physics, 01 natural sciences, Radioactive beam
Abstract

The early E ⩽ 511 keV gamma-ray emission from novae depends critically on the F 18 ( p , α ) O 15 reaction. Unfortunately the reaction rate of the F 18 ( p , α ) O 15 reaction is still largely uncertain due to the unknown strengths of low-lying proton resonances near the F 18 + p threshold which play an important role in the nova temperature regime. We report here our last results concerning the study of the d ( F 18 , p ) F 19 ( α ) N 15 transfer reaction. We show in particular that these two low-lying resonances cannot be neglected. These results are then used to perform a careful study of the remaining uncertainties associated to the F 18 ( p , α ) O 15 and F 18 ( p , γ ) Ne 19 reaction rates.

Published
2007

41. Spectroscopy ofNe19for the thermonuclearO15(α,γ)Ne19andF18(p,α)O15reaction rates

Author

Jürgen Kiener, N. de Séréville, Ralf Hertenberger, P. Adsley, Kathrin Wimmer, Fairouz Hammache, I. Stefan, H.-F. Wirth, B. R. Fulton, Anuj Parikh, Thomas Faestermann, D. Seiler, and Alison Laird

Subjects
Reaction rate, Physics, Nuclear and High Energy Physics, Thermonuclear fusion, Proton, Nuclear structure, Atomic physics, Type (model theory), Spectroscopy
Abstract

Uncertainties in the thermonuclear rates of the $^{15}\text{O}(\ensuremath{\alpha},\ensuremath{\gamma}){}^{19}\text{Ne}$ and ${}^{18}\text{F}(p,\ensuremath{\alpha}){}^{15}\text{O}$ reactions affect model predictions of light curves from type I x-ray bursts and the amount of the observable radioisotope $^{18}\text{F}$ produced in classical novae, respectively. To address these uncertainties, we have studied the nuclear structure of $^{19}\text{Ne}$ over ${E}_{x}=4.0\ensuremath{-}5.1$ and 6.1--7.3 MeV using the $^{19}\text{F}(^{3}\text{He},t)^{19}\text{Ne}$ reaction. We find the ${J}^{\ensuremath{\pi}}$ values of the 4.14- and 4.20-MeV levels to be consistent with $9/{2}^{\ensuremath{-}}$ and $7/{2}^{\ensuremath{-}}$, respectively, in contrast to previous assumptions. We confirm the recently observed triplet of states around 6.4 MeV and find evidence that the state at 6.29 MeV, just below the proton threshold, is either broad or a doublet. Our data also suggest that predicted but yet unobserved levels may exist near the 6.86-MeV state. Higher resolution experiments are urgently needed to further clarify the structure of $^{19}\text{Ne}$ around the proton threshold before a reliable ${}^{18}\text{F}(p,\ensuremath{\alpha}){}^{15}\text{O}$ rate for nova models can be determined.

Published
2015

42. Measurement ofNa23(α,p)Mg26at Energies Relevant toAl26Production in Massive Stars

Author

Alison Laird, A. Rojas, N. de Séréville, M. Shen, Alan Shotter, N. Galinski, G. Christian, Chris Ruiz, B. R. Fulton, Jennifer Fallis, Thomas Davinson, J. R. Tomlinson, Barry Davids, S. P. Fox, C. Akers, M. A. Bentley, and Martín Alcorta

Subjects
Physics, Nuclear physics, Reaction rate, Solar System, Cross section (physics), Stars, Range (particle radiation), Nucleosynthesis, General Physics and Astronomy, Sensitivity (control systems), 7. Clean energy, Galaxy
Abstract

26Al is an important radioisotope in astrophysics that provides evidence of ongoing nucleosynthesis in the Galaxy. The 23Na(α, p)26Mg reaction has been identified by a sensitivity study as being one of the most important reactions for the production of 26Al in the convective C/Ne burning shell of massive stars. Owing to large uncertainties in previous experimental data, model calculations are used for the reaction rate of 23Na(α, p)26Mg in this sensitivity study. Current experimental data suggest a reaction rate a factor of ∼40 higher than model calculations. However, a new measurement of this reaction cross section has been made in inverse kinematics in the energy range E(c.m.)=1.28-3.15 MeV at TRIUMF, and found to be in reasonable agreement with the model calculation. A new reaction rate is calculated and tight constraints on the uncertainty in the production of 26Al, due to this reaction, are determined.

Published
2015

43. Studying astrophysical reactions with low-energy RI beams at CRIB

Author

Tetsuro Komatsubara, Y. Wakabayashi, Y. Sakaguchi, Seigo Kato, A. Coc, Claudio Spitaleri, L. H. Khiem, Shigeru Kubono, M. La Cognata, D. Kahl, T. Hashimoto, S. Romano, Y. K. Kwon, D. N. Binh, H. Yamaguchi, Shawn Bishop, G. G. Rapisarda, Silvio Cherubini, T. Kawabata, N. N. Duy, M. Gulino, Takashi Teranishi, F. Hammache, Naohito Iwasa, Livio Lamia, S. Hayakawa, N. de Séréville, G. G. Kiss, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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 Physique Nucléaire d'Orsay (IPNO), 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
QC1-999, THERMONUCLEAR REACTION-RATES, SEPARATOR CRIB, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, Reaction rate, Low energy, 0103 physical sciences, Nuclear astrophysics, 010306 general physics, Nuclear Experiment, Physics, NUCLEAR ASTROPHYSICS, RELEVANT, 010308 nuclear & particles physics, Nuclear structure, Resonant scattering, Supernova, TARGET, STATES, 13. Climate action, THERMONUCLEAR REACTION-RATES, NUCLEAR ASTROPHYSICS, SEPARATOR CRIB, STATES, COMPILATION, RELEVANT, SYSTEM, TARGET, COMPILATION, Experimental methods, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Beam (structure), SYSTEM
Abstract

International audience; Studies on nuclear astrophysics, nuclear structure, and other interests have been performed using the radioactive-isotope (RI) beams at the low-energy RI beam separator CRIB, operated by Center for Nuclear Study (CNS), the University of Tokyo. A typical measurement performed at CRIB is the elastic resonant scattering with the inverse kinematics. One recent experiment was on the alpha resonant scattering with ^7Li and ^7Be beams. This study is related to the astrophysical ^7Li/^7Be(alpha,gamma) reactions, important at hot p-p chain and nup-process in supernovae. There have also been measurements based on other experimental methods. The first THM measurement using an RI beam has been performed at CRIB, to study the ^18F(p, alpha)^15O reaction at astrophysical energies via the three body reaction ^2H(^18F, alpha^15O)n. The ^18F(p, alpha) ^15O reaction rate is crucial to understand the 511-keV gamma-ray production in nova explosion phenomena, and we successfully evaluated the reaction cross section at novae temperature and below experimentally for the first time.

Published
2015

44. Measurement of 23Na(α,p)26Mg at Energies Relevant to 26Al Production in Massive Stars

Author

J R, Tomlinson, J, Fallis, A M, Laird, S P, Fox, C, Akers, M, Alcorta, M A, Bentley, G, Christian, B, Davids, T, Davinson, B R, Fulton, N, Galinski, A, Rojas, C, Ruiz, N, de Séréville, M, Shen, and A C, Shotter

Abstract

26Al is an important radioisotope in astrophysics that provides evidence of ongoing nucleosynthesis in the Galaxy. The 23Na(α, p)26Mg reaction has been identified by a sensitivity study as being one of the most important reactions for the production of 26Al in the convective C/Ne burning shell of massive stars. Owing to large uncertainties in previous experimental data, model calculations are used for the reaction rate of 23Na(α, p)26Mg in this sensitivity study. Current experimental data suggest a reaction rate a factor of ∼40 higher than model calculations. However, a new measurement of this reaction cross section has been made in inverse kinematics in the energy range E(c.m.)=1.28-3.15 MeV at TRIUMF, and found to be in reasonable agreement with the model calculation. A new reaction rate is calculated and tight constraints on the uncertainty in the production of 26Al, due to this reaction, are determined.

Published
2015

45. Development of a Monte Carlo code for the data analysis of the 18F(p,α)15O reaction at astrophysical energies

Author

C. Spitaleri, S. Romano, Tetsuro Komatsubara, Yusuke Wakabayashi, S. Hayakawa, H. Yamaguchi, M. Gulino, A. Caruso, Seigo Kato, M. L. Sergi, Naohito Iwasa, G. G. Rapisarda, A. Coc, N. de Séréville, Shigeru Kubono, V. Crucillà, M. La Cognata, Silvio Cherubini, F. Hammache, Takashi Teranishi, Livio Lamia, CSNSM AN, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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)-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 de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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 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 de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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)-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 de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM)

Subjects
Physics, Nuclear reaction, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, White dwarf, 020206 networking & telecommunications, 02 engineering and technology, Astrophysics, Radiation, [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], 7. Clean energy, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Nuclear physics, Interstellar medium, 13. Climate action, Nucleosynthesis, Nuclear Reactions, 0202 electrical engineering, electronic engineering, information engineering, Astrophysics::Solar and Stellar Astrophysics, Nuclear fusion, 020201 artificial intelligence & image processing, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Novae
Abstract

International audience; Novae are astrophysical events (violent explosion) occurring in close binary systems consisting of a white dwarf and a main-sequence star or a star in a more advanced stage of evolution.They are called "narrow systems" because the two components interact with each other: there is a process of mass exchange with resulting in the transfer of matter from the companion star to the white dwarf, leading to the formation of this last of the so-called accretion disk, rich mainly of hydrogen.Over time, more and more material accumulates until the pressure and the temperature reached are sufficient to trigger nuclear fusion reactions, rapidly converting a large part of the hydrogen into heavier elements. The products of "hot hydrogen burning" are then placed in the interstellar medium as a result of violent explosions.Studies on the element abundances observed in these events can provide important information about the stages of evolution stellar.During the outbursts of novae some radioactive isotopes are synthesized: in particular, the decay of short-lived nuclei such as N-13 and F-18 with subsequent emission of gamma radiation energy below 511 keV. The gamma rays from products electron-positron annihilation of positrons emitted in the decay of F-18 are the most abundant and the first observable as soon as the atmosphere of the nova starts to become transparent to gamma radiation. Hence the importance of the study of nuclear reactions that lead both to the formation and to the destruction of F-18. Among these, the F-18(p, alpha)O-15 reaction is one of the main channels of destruction. This reaction was then studied at energies of astrophysical interest.The experiment done at Riken, Japan, has as its objective the study of the F-18(p, alpha)O-15 reaction, using a beam of F-18 produced at CRIB, to derive important information about the phenomenon of novae.In tis paper we present the experimental technique and the Monte Carlo code developed to be used in the data analysis process.

Published
2015

46. Evolution of single-particle strength in neutron-rich 71Cu

Author

C. Louchart, G. Marquínez-Durán, P. Morfouace, M. Assié, S. Franchoo, S. Boissinot, D. Beaumel, F. Azaiez, D. Mengoni, J. A. Scarpaci, D. R. Napoli, R. Borcea, Zsolt Dombrádi, Kamila Sieja, L. Lefebvre, A. Matta, Zs. Vajta, F. Recchia, A. Lepailleur, C. Stodel, M. Niikura, Ismael Martel, N. de Séréville, G. Burgunder, B. Fernández-Domínguez, L. Caceres, O. Sorlin, I. Stefan, O. Kamalou, A. M. Sánchez-Benítez, S. Grévy, L. Nalpas, J. Elseviers, A. Gillibert, V. Lapoux, I. Matea, C. Borcea, Fairouz Hammache, M. Stanoiu, Dóra Sohler, J. C. Thomas, S. Giron, 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 Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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, 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), Universidade de Santiago de Compostela [Spain] (USC ), 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), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), GANILEXP, Universidade de Santiago de Compostela. Departamento de Física de Partículas, 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), 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, Nuclear and High Energy Physics, Proton, Fizikai tudományok, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, lcsh:QC1-999, Nuclear physics, Cross section (physics), Distribution (mathematics), Atomic orbital, Természettudományok, Particle, Neutron, Atomic physics, Born approximation, Nuclear Experiment, Radioactive beam, lcsh:Physics
Abstract

The strength functions of the πf5/2πf5/2, πp3/2πp3/2 and πf7/2πf7/2 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 πf5/2πf5/2 orbital and contrary to earlier interpretation, the πf7/2πf7/2 single-particle strength distribution is not appreciably affected by the addition of neutrons beyond N=40N=40., The authors are thankful to the Ganil accelerator staff, informatics service and to the IPN design office. We are grateful for the grant of the Romanian National Authority for Scientific Research, CNCS - UEFISCDI, project number PN-II-ID-PCE-2011-3-048, to the grant FPA2010-22131-C02-01 from the Spanish government and to the OTKA contract No. K100835.

Published
2015

47. Characterization of light particles (Z ≤ 2) discrimination performances by pulse shape analysis techniques with high-granularity silicon detector

Author

A. Jallat, Y. Blumenfeld, E. Rauly, A. S. Torrento, J.-J. Dormard, M. Assié, J.A. Dueñas, J. Guillot, V. Le Ven, T. Faul, Ismael Martel, N. de Séréville, D. Suzuki, D. Mengoni, B. Genolini, B. Le Crom, S. Ancelin, Marin Chabot, D. Beaumel, Institut de Physique Nucléaire d'Orsay (IPNO), 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, Nuclear and High Energy Physics, 010308 nuclear & particles physics, business.industry, Detector, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Threshold energy, 01 natural sciences, Signal, Noise (electronics), Particle detector, Semiconductor detector, Optics, Amplitude, 0103 physical sciences, 010306 general physics, business, Energy (signal processing)
Abstract

Pulse shape analysis for light particles ( $Z \leq 2$ ) is studied in a 500 μm thick Double-Sided Stripped Silicon Detector (DSSSD) of nTD type with a pitch lower than 500 μm. Good separation between the $Z = 1$ isotopes is achieved irrespective of the side used for signal pick up with the detector biased at depletion voltage. The low energy threshold for discrimination between $Z = 1$ isotopes is found to be around 2.5 MeV at depletion voltage and the quality of the separation can be slightly improved by using filtering methods. On the other hand, the discrimination performances are enhanced when lowering the bias of the detector at the expense of energy resolution. At nominal bias (i.e. overdepletion) where the energy resolution is the best, no separation between the three hydrogen isotopes is achieved when using the amplitude of the current signal. Discrimination can still be obtained by acquiring the time over a threshold set at 10% of the amplitude after applying a square bipolar filter to the current signal. Besides, in view of the design of the front-end electronics, the effect of the sampling rate needed for pulse shape analysis has been investigated and shows that below 200 MSa/s, the discrimination quality is strongly reduced.

Published
2015

48. Fast-neutron induced background in LaBr3:Ce detectors

Author

M. S. Yavahchova, C. Blondel, G. Prévot, C. Hamadache, B. Horeau, N. de Séréville, I. Deloncle, A. Gostojic, O. Limousin, R. Rodríguez-Gasén, N. Goutev, Marin Chabot, P. Laurent, Fairouz Hammache, Jürgen Kiener, Vincent Tatischeff, Remi Chipaux, S. Dubos, A. Coc, S. Ouichaoui, CSNSM AN, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), CSNSM SNO, 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), Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI) (DEDIP), 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, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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)-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 de Sciences Nucléaires et de Sciences de la Matière (CSNSM)

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Proton, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, Monte-Carlo simulation, Scintillator, 7. Clean energy, 01 natural sciences, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Nuclear physics, NE-213, 0103 physical sciences, Neutron detection, Neutron, Irradiation, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010303 astronomy & astrophysics, Instrumentation, Instrumentation and Methods for Astrophysics (astro-ph.IM), Neutron irradiation, [PHYS]Physics [physics], Bonner sphere, Physics, Range (particle radiation), 010308 nuclear & particles physics, Detector, Instrumentation and Detectors (physics.ins-det), LaBr3:Ce, HP-Ge, High Energy Physics::Experiment, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The response of a scintillation detector with a cylindrical 1.5-inch LaBr3:Ce crystal to incident neutrons has been measured in the energy range En = 2-12 MeV. Neutrons were produced by proton irradiation of a Li target at Ep = 5-14.6 MeV with pulsed proton beams. Using the time-of-flight information between target and detector, energy spectra of the LaBr3:Ce detector resulting from fast neutron interactions have been obtained at 4 different neutron energies. Neutron-induced gamma rays emitted by the LaBr3:Ce crystal were also measured in a nearby Ge detector at the lowest proton beam energy. In addition, we obtained data for neutron irradiation of a large-volume high-purity Ge detector and of a NE-213 liquid scintillator detector, both serving as monitor detectors in the experiment. Monte-Carlo type simulations for neutron interactions in the liquid scintillator, the Ge and LaBr3:Ce crystals have been performed and compared with measured data. Good agreement being obtained with the data, we present the results of simulations to predict the response of LaBr3:Ce detectors for a range of crystal sizes to neutron irradiation in the energy range En = 0.5-10 MeV, Comment: 28 pages, 10 figures, 4 Tables

Published
2015
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49. THM determination of the 65 keV resonance strength intervening in the 17O(p,α)14N reaction rate

Author

V. Kroha, R. G. Pizzone, A. Coc, S. M. R. Puglia, Aurora Tumino, G. G. Rapisarda, C. Spitaleri, S. Romano, E. Somorjai, N. de Séréville, Z. Hons, Livio Lamia, M. L. Sergi, Gabor Kiss, B. F. Irgaziev, Marisa Gulino, S. Cherubini, A. M. Mukhamedzhanov, Fairouz Hammache, S. V. Burjan, M. La Cognata, CSNSM AN, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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)-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 de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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 Physique Nucléaire d'Orsay (IPNO), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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)-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 de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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
supernovae, TROJAN HORSE METHOD, THERMONUCLEAR REACTION-RATES, Direct reactions, 02 engineering and technology, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Reaction rate, Nucleosynthesis, Nuclear Astrophysics, ALPHA)N-14, 0202 electrical engineering, electronic engineering, information engineering, Nuclear astrophysics, Astrophysics::Solar and Stellar Astrophysics, Asymptotic giant branch, Astrophysics::Galaxy Astrophysics, NUCLEOSYNTHESIS, Physics, O-18(P, O-17(P, Nucleosynthesis in novae, Resonance, 020206 networking & telecommunications, Alpha particle, Nuclear Astrophysics, Direct reactions, Nucleosynthesis in novae, supernovae, and other explosive environments, [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], Supernova, Stars, and other explosive environments, 020201 artificial intelligence & image processing, Astrophysics::Earth and Planetary Astrophysics, ASTROPHYSICAL ENERGIES, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], CROSS-SECTION
Abstract

International audience; The O-17(p,alpha)N-14 reaction is of paramount importance for the nucleosynthesis in a number of stellar sites, including red giants (RG), asymptotic giant branch (AGB) stars, massive stars and classical novae. We report on the indirect study of the O-17(p,alpha)N-14 reaction via the Trojan Horse Method by applying the approach recently developed for extracting the resonance strength of the narrow resonance at E-c.m.(R) = 65 keV (E-X = 5.673 MeV). The strength of the 65 keV resonance in the O-17(p,alpha)N-14 reaction, measured by means of the THM, has been used to renormalize the corresponding resonance strength in the O-17 + p radiative capture channel.

Published
2015

50. The elastic scattering 7Be + p at low energies: implications on the 7Be(p, γ)8Be S-factor

Author

Pierre Leleux, Daniel Jean Baye, N. de Séréville, F. Vanderbist, Manoel Couder, M. Cogneau, P. Figuera, M. Azzouz, F. de Oliveira Santos, R. G. Pizzone, Guido Ryckewaert, Carmen Angulo, Thomas Davinson, G. Tabacaru, Pierre Descouvemont, A. Di Pietro, Marc Loiselet, and Michel Gaelens

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Cross section (physics), Recoil, S-factor, law, Scattering, Cyclotron, Atomic physics, Spin (physics), Resonance (particle physics), law.invention
Abstract

The 7Be + p elastic cross section has been measured at the Centre de Recherches du Cyclotron RIB facility at Louvain-la-Neuve in the c.m. energy region from 0.3 to 0.75 MeV by bombarding a proton-rich target with a radioactive 7Be beam. The recoil protons have been detected in the angular range θc.m. = 120.2° − 131.1° and θc.m. = 156.6° − 170.2° using the LEDA system. From a R-matrix analysis of the cross section data, we extract the energy and the width of the 1+ resonance. The scattering lengths α01 = 25 ± 9 fm (channel spin I = 1) and α02 = −7 ± 3 fm (channel spin I = 2) are deduced. Implications on the low energy S-factor of the 7Be(p, γ)8B reaction are discussed.

Published
2003

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