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1. Strong coupling effects on near-barrier 15C + 208Pb elastic scattering

Author

V.G. Távora, J.D. Ovejas, I. Martel, N. Keeley, L. Acosta, M.J.G. Borge, O. Tengblad, A.A. Arokiaraj, M. Babo, J. Cederkall, N. Ceylan, A. Di Pietro, J.P. Fernández-García, P. Figuera, L.M. Fraile, H.O.U. Fynbo, D. Galaviz, C. García-Ramos, R. Honório, J.H. Jensen, B. Jonson, K.W. Kemper, A. Knyazev, R. Kotak, T. Kurtukian-Nieto, M. Madurga, G. Marquínez-Durán, M. Munch, A.K. Orduz, J. Park, L. Peralta, A. Perea, T. Pérez-Alvarez, R. Raabe, M. Renaud, K. Riisager, K. Rusek, A.M. Sánchez-Benítez, J. Sánchez-Segovia, P. Teubig, S. Viñals, M. Wolińska-Cichocka, R. Wolski, and J. Yang

Subjects
Direct nuclear reactions, Radioactive beams, Elastic scattering, Optical model, Coupled channels, Physics, QC1-999
Abstract

The presence of a neutron halo in 15C has been demonstrated in several reaction experiments at intermediate energies. In the present study, the dynamical effects of this structure are observed for the first time at Coulomb barrier energies in the 15C + 208Pb quasi-elastic scattering at Elab=65 MeV, measured at the HIE-ISOLDE facility, CERN using the high-granularity detector array GLORIA. A combined continuum discretised coupled channels and coupled reaction channels calculation describes the data well and significant coupling effects due both to breakup and single-neutron stripping are identified.

Published
2024
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2. Suppression of Coulomb-nuclear interference in the near-barrier elastic scattering of 17Ne from 208Pb

Author

J.D. Ovejas, I. Martel, D. Dell'Aquila, L. Acosta, J.L. Aguado, G. de Angelis, M.J.G. Borge, J.A. Briz, A. Chbihi, G. Colucci, C. Díaz-Martín, P. Figuera, D. Galaviz, C. García-Ramos, J.A. Gómez-Galán, C.A. Gonzales, N. Goyal, N. Keeley, K.W. Kemper, T. Kurtukian Nieto, D.J. Malenica, M. Mazzocco, D. Nurkić, A.K. Orduz, A. Ortiz, L. Palada, C. Parascandolo, A. Di Pietro, A.M. Rodriguez, K. Rusek, F. Salguero, A.M. Sánchez-Benítez, M. Sánchez-Raya, J. Sánchez-Segovia, N. Soić, F. Soramel, M. Stanoiu, O. Tengblad, N. Vukman, and M. Xarepe

Subjects
Direct nuclear reactions, Radioactive beams, Optical model, Elastic scattering, Physics, QC1-999
Abstract

The proton drip-line nucleus 17Ne is considered a good candidate for a Borromean two-proton halo with a 15O + p + p structure. Angular distributions of the elastic scattering and inclusive 15O production for a 136 MeV 17Ne beam incident on a 208Pb target were measured for the first time at the SPIRAL1 facility, GANIL. Use of the GLORIA detector array allowed high-resolution data over a wide angular range from 20∘ up to 95∘ in the laboratory frame to be obtained. The elastic scattering angular distribution shows similarities with those for both 6He and 20Ne at equivalent collision energies with respect to the corresponding Coulomb barriers, exhibiting the suppression of the Coulomb rainbow peak characteristic of strong coupling. Optical model and coupled channel fits suggest that this is due to a combination of coupling to low-lying quadrupole resonances and Coulomb dipole coupling to the low-lying continuum, although their relative importance depends on the relevant B(E2) values which remain to be firmly determined.

Published
2023
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3. The TRASGO Project. Present Status and Results

Author

D. García-Castro, M. Ajoor, H. Alvarez-Pol, A. Blanco, P. Cabanelas, J. Callón-Rivas, J. Collazo, F. Clemencio, J. J. Cuenca-García, M. Cruces, P. Fonte, Y. Fontenla, J. Flores, J. A. Garzón, A. Gomis-Moreno, A. Iglesias, G. Kornakov, T. Kurtukian-Nieto, L. Lopes, C. Loureiro, A. Pazos, C. Rodríguez, J. P. Saraiva, M. Seco, M. Valladares, V. Villasante-Marcos, and J. Xuna

Subjects
Nuclear and High Energy Physics, Atomic and Molecular Physics, and Optics
Published
2021
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4. Commissioning of the DESIR high-resolution mass separator

Author

J. Michaud, P. Alfaurt, A. Balana, B. Blank, L. Daudin, T. Kurtukian-Nieto, B. Lachacinski, L. Serani, J.-C. Thomas, F. Varenne, Laboratoire de Physique des Deux Infinis Bordeaux (LP2I - Bordeaux), Université de Bordeaux (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Aberrations, Magnetic separator, Multipole, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Instrumentation
Abstract

International audience; DESIR is, together with S3-LEB, the low-energy part of the SPIRAL2 ISOL facility at GANIL. The High-Resolution mass Separator (HRS) included in DESIR is a 180° symmetric online separator with two 90° magnetic dipole sections arranged with electrostatic quadrupoles, sextupoles and a 48-pole electrostatic multipole on the mid plane. The HRS is now completely mounted at LP2i Bordeaux and under commissioning for the next years before its transfer to the entrance of the DESIR facility. Optical aberrations, mainly introduced by the dipoles, must be corrected up to the highest possible order to guarantee an optimal resolution of the separator. They are measured with a pepperpot-type emittance-meter, analyzed then corrected with the multipole. Up to now, 2nd order (hexapolar) and part of 3rd order (octupolar) aberrations are under control and an optimal FWHM separation has been achieved for two identical beams with a relative energy difference of .In this paper, we present the effects of optical aberrations on the beam and its emittance figure, as well as the effect of the associated corrections with the multipole. Finally, we will show the latest resolution measurements and associated methodology.

Published
2022
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5. Experimental setup for Weak Interaction Studies with Radioactive ion-beams WISArD

Author

D. Atanasov, F. Cresto, L. Nies, M. Pomorski, M. Versteegen, P. Alfaurt, V. Araujo-Escalona, P. Ascher, B. Blank, L. Daudin, D. Guillet, X. Fléchard, J. Ha, A. Husson, M. Gerbaux, J. Giovinazzo, S. Grévy, T. Kurtukian-Nieto, L. Leterrier, R. Lica, E. Liénard, C. Mihai, C. Neacsu, A. Ortega-Moral, G. Pascovici, M. Roche, N. Severijns, S. Vanlangendonck, A. Welker, and D. Zákoucký

Subjects
Nuclear and High Energy Physics, Detectors and Experimental Techniques, Instrumentation
Abstract

The article describes the commissioning and technical development of the Weak Interaction Studies with 32Ar Decay (WISArD) experiment, installed at the radioactive ion-beam facility ISOLDE/CERN. The experiment aims to extend the present limits on scalar and tensor currents in the weak interaction and hence search for physics beyond the Standard Model. The evaluation of these limits relies on measuring the proton energy in beta-delayed proton emission, sensitive to both the beta-neutrino angular correlation coefficient aβν and the Fierz interference term b. The method tries to improve previous studies by considering the positron-proton coincidences when determining the kinematic shift in the energy of the emitted protons. Using this coincidence technique, the aβν and b coefficients will be measured at the per mil level. Simulations were employed to optimize the ion beam transport efficiency and validate proof-of-principle results obtained in November 2018 (Nov2018). Upgrades are ongoing, and we are looking into improvements to the overall performance of the setup.

Published
2023
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7. WISArD : Weak Interaction Studies with 32Ar Decay

Author

Maud Versteegen, P. Alfaurt, P. Ascher, D. Atanasov, B. Blank, F. Cresto, L. Daudin, X. Fléchard, M. Gerbaux, J. Giovinazzo, S. Grévy, T. Kurtukian-Nieto, E. Liénard, M. Pomorski, N. Severijns, S. Vanlangendonck, and D. Zakoucky

Published
2022
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8. Spectroscopy and lifetime measurements in Te134,136,138 isotopes and implications for the nuclear structure beyond N=82

Author

D. Verney, D. Ralet, J. Wiederhold, S. Bottoni, L. Matthieu, B. Fornal, A. Blazhev, P. H. Regan, C. Schmitt, R.L. Canavan, K. Rezynkina, D. Reygadas Tello, A. Lopez-Martens, K. Hauschild, B. Wasilewska, I. Matea, A. Korgul, C. Henrich, J. Jolie, V. Guadilla, M. Lebois, M. Babo, Th. Kröll, L. M. Fraile, J. Benito, G. Benzoni, T. Kurtukian-Nieto, L. Qi, Stephan Oberstedt, C. Porzio, M. Bunce, N. Warr, R. B. Gerst, P. A. Söderström, Y. Popovitch, W. Paulsen, F. Ibrahim, Ł. W. Iskra, G. Häfner, J. N. Wilson, S. Jazwari, M. S. Yavahchova, R. Chakma, C. Delafosse, A. Boso, R. Lozeva, N. Jovančević, V. Sanchez, H. Naïdja, M. Rudigier, P. Adsley, L. Le-meur, N. Cieplicka-Oryńczak, I. Homm, E. Adamska, G. Tocabens, K. Belvedere, D. Gjestvang, D. Thisse, M. L. Cortés, P. Koseoglou, P. Davies, V. Vedia, J. Nemer, M. Piersa, Muriel Fallot, C. Sürder, K. Miernik, S. M. Collins, S. Ziliani, D. Etasse, Fabio Zeiser, and J. Ljungvall

Subjects
Physics, Spectrometer, Isotope, 010308 nuclear & particles physics, Fission, Nuclear structure, Context (language use), 7. Clean energy, 01 natural sciences, Excited state, 0103 physical sciences, Neutron source, Atomic physics, 010306 general physics, Spectroscopy
Abstract

We report on spectroscopic information and lifetime measurements of even-even neutron-rich Te isotopes. Excited states were populated in fast-neutron induced fission of U238 at the ALTO facility of IJCLab with the LICORNE neutron source and detected using the hybrid ν-ball spectrometer. We provide first results on lifetimes of the 61+ state in Te136 and the (61+), (41+), and (21+) states in Te138 and discuss the results in the context of large-scale shell-model calculations. The level schemes of Te136 and Te138 are revised in terms of lifetimes of their 21+,41+ states and updated information on the (42+) state in Te136 is presented. In addition, previously reported data on spectroscopy and lifetimes in Te134 are reexamined. This work provides new insights into the evolution of collectivity for Te isotopes with N=82,84,86.

Published
2021
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9. Angular momentum generation in nuclear fission

Author

B. Fornal, M. S. Yavahchova, C. Delafosse, A. Boso, V. Sánchez-Tembleque, K. Rezynkina, M. Lebois, K. Hauschild, T. Kröll, Muriel Fallot, P. Adsley, J. Ljungvall, Ł. W. Iskra, F. Ibrahim, E. Adamska, C. Henrich, A. Gottardo, Stephan Oberstedt, R. Chakma, C. Sürder, V. Guadilla, C. Porzio, P. H. Regan, J. Benito, A. Korgul, R. Lozeva, L. Le Meur, M. Piersa, P. Ivanov, V. Vedia, J. Nemer, B. Wasilewska, N. Jovančević, Y. Popovitch, W. Paulsen, C. Schmitt, N. Cieplicka-Oryńczak, R. B. Gerst, Sunniva Siem, G. Tocabens, P. A. Söderström, K. Belvedere, S. Courtin, S. Ziliani, R. Canavan, D. Gjestvang, L. Qi, D. Etasse, P. Koseoglou, G. Häfner, I. Matea, I. Homm, M. Heine, L. M. Fraile, T. Kurtukian-Nieto, Fabio Zeiser, P. Davies, D. Thisse, M. L. Cortés, A. Blazhev, S. Jazrawi, M. Bunce, A. Lopez-Martens, K. Miernik, Alejandro Algora, M. Rudigier, J. N. Wilson, N. Warr, J. Wiederhold, D. Verney, D. Ralet, M. Babo, L. Gaudefroy, G. Benzoni, S. Bottoni, S. Leoni, 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), University of Oslo (UiO), Department of Physics, University of Surrey, University of Surrey (UNIS), Technische Universität Darmstadt - Technical University of Darmstadt (TU Darmstadt), 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), CEA, Bruyeres le Chatel, France, affiliation inconnue, University of Warsaw (UW), Facultat de Fisica [València] (UV), Universitat de València (UV), Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM), Università degli Studi di Milano = University of Milan (UNIMI), Institut für Kernphysik der Universität zu Köln, Universität zu Köln = University of Cologne, National Physical Laboratory [Teddington] (NPL), Instytut Fizyki Jądrowej PAN (IFJ), Polskiej Akademii Nauk, 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), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), University of Manchester [Manchester], Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (INFN, Sezione di Padova), Istituto Nazionale di Fisica Nucleare (INFN), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), European Commission - Joint Research Centre [Geel] (JRC), 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), Horia Hulubei Natl Inst Phys & Nucl Engn IFIN HH, ELI NP Dept, Reactorului Str 30, Magurele 077125, Romania, Софийски университет = Sofia University, Technische Universität Darmstadt (TU Darmstadt), Universidad Complutense de Madrid [Madrid] (UCM), Università degli studi di Milano [Milano], Universität zu Köln, Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Technical University Darmstadt (TU), 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 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), University of Sofia, Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Università degli Studi di Milano [Milano] (UNIMI), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Physics, [PHYS]Physics [physics], Angular momentum, Multidisciplinary, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Spins, 010308 nuclear & particles physics, Fission, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, Nuclear fission, 0103 physical sciences, Atomic nucleus, Nuclear Experiment, 010306 general physics, Nucleon, Excitation, ComputingMilieux_MISCELLANEOUS, Spin-½
Abstract

When a heavy atomic nucleus splits (fission), the resulting fragments are observed to emerge spinning1; this phenomenon has been a mystery in nuclear physics for over 40 years2,3. The internal generation of typically six or seven units of angular momentum in each fragment is particularly puzzling for systems that start with zero, or almost zero, spin. There are currently no experimental observations that enable decisive discrimination between the many competing theories for the mechanism that generates the angular momentum4–12. Nevertheless, the consensus is that excitation of collective vibrational modes generates the intrinsic spin before the nucleus splits (pre-scission). Here we show that there is no significant correlation between the spins of the fragment partners, which leads us to conclude that angular momentum in fission is actually generated after the nucleus splits (post-scission). We present comprehensive data showing that the average spin is strongly mass-dependent, varying in saw-tooth distributions. We observe no notable dependence of fragment spin on the mass or charge of the partner nucleus, confirming the uncorrelated post-scission nature of the spin mechanism. To explain these observations, we propose that the collective motion of nucleons in the ruptured neck of the fissioning system generates two independent torques, analogous to the snapping of an elastic band. A parameterization based on occupation of angular momentum states according to statistical theory describes the full range of experimental data well. This insight into the role of spin in nuclear fission is not only important for the fundamental understanding and theoretical description of fission, but also has consequences for the γ-ray heating problem in nuclear reactors13,14, for the study of the structure of neutron-rich isotopes15,16, and for the synthesis and stability of super-heavy elements17,18. γ-ray spectroscopy experiments on the origin of spin in the products of nuclear fission of spin-zero nuclei suggest that the fission fragments acquire their spin after scission, rather than before.

Published
2021
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10. β decay of the very neutron-deficient Ge60 and Ge62 nuclei

Author

Momoko Tanaka, E. Ganioǧlu, Gabor Kiss, F. Diel, Daiki Nishimura, G. de Angelis, F. Molina, Naohito Inabe, Toshiyuki Kubo, T. Kurtukian-Nieto, D. R. Napoli, A. Montaner-Pizá, P. A. Söderström, A. Boso, P. Ascher, S. Grévy, A. I. Morales, V. H. Phong, Shunji Nishimura, J. Giovinazzo, P. Aguilera, C. Sidong, Shigeru Kubono, J. Chiba, R. B. Cakirli, Y. Fujita, Hiroyoshi Sakurai, S. Yagi, C. Magron, J. Agramunt, V. Guadilla, B. Rubio, Y. Shimizu, M. Gerbaux, H. Oikawa, D. Lubos, D. S. Ahn, P. Doornenbal, C. Borcea, Shintaro Go, B. Blank, Toshiyuki Sumikama, Hiroyuki Takeda, S. E.A. Orrigo, N. Fukuda, Jin Wu, Y. Takei, H. Suzuki, Alejandro Algora, T. Goigoux, and W. Gelletly

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Branching fraction, Excited state, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Ground state, 7. Clean energy, 01 natural sciences, Fermi Gamma-ray Space Telescope
Abstract

We report here the results of a study of the $\beta$ decay of the proton-rich Ge isotopes, $^{60}$Ge and $^{62}$Ge, produced in an experiment at the RIKEN Nishina Center. We have improved our knowledge of the half-lives of $^{62}$Ge (73.5(1) ms), $^{60}$Ge (25.0(3) ms) and its daughter nucleus, $^{60}$Ga (69.4(2) ms). We measured individual $\beta$-delayed proton and $\gamma$ emissions and their related branching ratios. Decay schemes and absolute Fermi and Gamow-Teller transition strengths have been determined. The mass excesses of the nuclei under study have been deduced. A total $\beta$-delayed proton-emission branching ratio of 67(3)% has been obtained for $^{60}$Ge. New information has been obtained on the energy levels populated in $^{60}$Ga and on the 1/2$^-$ excited state in the $\beta p$ daughter $^{59}$Zn. We extracted a ground state to ground state feeding of 85.3(3)% for the decay of $^{62}$Ge. Eight new $\gamma$ lines have been added to the de-excitation of levels populated in the $^{62}$Ga daughter.

Published
2021
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11. First lifetime investigations of $N>82$ iodine isotopes: The quest for collectivity

Author

A. Korgul, J. Wiederhold, Th. Kröll, S. Leoni, P. Adsley, Muriel Fallot, M. Babo, J. Benito, G. Benzoni, V. Vedia, K. Miernik, L. Qi, J. Nemer, V. Guadilla, C. Sürder, S. Bottoni, D. Verney, S. Jazwari, N. Warr, A. Boso, K. Rezynkina, D. Ralet, J. Ljungvall, F. Ibrahim, L. M. Fraile, T. Kurtukian-Nieto, M. Lebois, Fabio Zeiser, R. Chakma, A. Blazhev, P. H. Regan, R. Lozeva, C. Schmitt, L. Matthieu, R.L. Canavan, M. Piersa-Siłkowska, A. Algora, N. Jovančević, J. N. Wilson, Y. Popovitch, N. Cieplicka-Oryńczak, W. Paulsen, E. Adamska, G. Tocabens, P. Davies, K. Belvedere, D. Gjestvang, S. M. Collins, S. Ziliani, D. Etasse, M. Bunce, C. Henrich, R. B. Gerst, A. Lopez-Martens, M. Rudigier, Ł. W. Iskra, G. Häfner, B. Wasilewska, Stephan Oberstedt, C. Porzio, P. A. Söderström, C. Delafosse, V. Sánchez-Tembleque, L. Le-meur, H. Naïdja, M. S. Yavahchova, P. Koseoglou, I. Homm, D. Thisse, M. L. Cortés, D. Reygadas Tello, K. Hauschild, 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), Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), 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 Laue-Langevin (ILL), 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), 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 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), ILL, and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Fission, chemistry.chemical_element, Context (language use), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Iodine, 01 natural sciences, chemistry, Excited state, 0103 physical sciences, Neutron source, Física nuclear, Atomic physics, 010306 general physics
Abstract

International audience; We report on spectroscopic information and lifetime measurements in the neutron-rich I135,137,139 isotopes. This is the first lifetime data on iodine isotopes beyond N=82. Excited states were populated in fast neutron-induced fission of U238 at the ALTO facility of IJCLab with the LICORNE neutron source and detected using the hybrid ν-ball spectrometer. The level schemes of the I135,137,139 isotopes are revised in terms of excited states with up to maximum spin-parity of (33/2+), populated for the first time in fast neutron-induced fission. We provide first results on the lifetimes of the (9/21+) and (13/21+) states in I137 and I139, and the (17/21+) state in I137. In addition, we give upper lifetime limits for the (11/21+) states in I135−139, the (15/21+) state in I137, the (17/21+) state in I139, and reexamine the (29/21+) state in I137. The isomeric data in I135 are reinvestigated, such as the previously known (15/21+) and (23/21−) isomers with T1/2 of 1.64(14) and 4.6(7) ns, respectively, as obtained in this work. The new spectroscopic information is compared to that from spontaneous or thermal-neutron induced fission and discussed in the context of large scale shell-model (LSSM) calculations for the region beyond Sn132, indicating the behavior of collectivity for the three valence-proton iodine chain with N=82,84,86.

Published
2021
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12. Design study of a Superconducting Recoil Separator for HIE-ISOLDE

Author

L Acosta, J L Aguado, M Assie, M A M Al-Aqeel, D Barna, R Berjillos, M J G Borge, J A Briz, I Bustinduy, L Bottura, W Catford, J Cederkall, T Davinson, G De Angelis, T Ekelof, H Fynbo, A P Foussat, R Florin, L Gaffney, C García-Ramos, A Heinz, K Johnston, B Jonson, T Junquera, G Kirby, O Kochebina, T Kurtukian-Nieto, M Labiche, M Losasso, A Laird, I Martel, J L Muñoz, B S Nara Singh, G Neyens, R D Page, J Resta-López, J A Rodriguez, V Rodin, V R Sharma, J Sánchez-Segovia, K Riisager, A M Sánchez-Benítez, B Shepherd, E Siesling, J Smallcombe, M Stanoiu, O Tengblad, J P Thermeau, D Tommasini, J Uusitalo, S Varnasseri, and C P Welsch

Published
2021
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13. Prompt and delayed γ spectroscopy of neutron-rich Kr94 and observation of a new isomer

Author

R. Chakma, N. Cieplicka-Oryńczak, P. Adsley, G. Tocabens, Muriel Fallot, K. Belvedere, D. Gjestvang, L. Qi, J. Wiederhold, S. Leoni, C. Sürder, J. Benito, J. N. Wilson, K. Hauschild, R. B. Gerst, Stephan Oberstedt, Ł. W. Iskra, C. Porzio, P. A. Söderström, G. Häfner, M. Rudigier, I. Matea, C. Henrich, D. Verney, R.L. Canavan, K. Miernik, V. Vedia, D. Ralet, J. Nemer, P. Koseoglou, M. Piersa, N. Warr, R. Lozeva, L. Le Meur, A. Algora, M. Lebois, N. Jovančević, K. Rezynkina, S. Jazrawi, A. Blazhev, S. Courtin, M. Bunce, S. Bottoni, P. H. Regan, A. Boso, A. Lopez-Martens, C. Schmitt, B. Fornal, P. Ivanov, B. Wasilewska, L. M. Fraile, F. Ibrahim, M. Babo, T. Kurtukian-Nieto, A. Gottardo, G. Benzoni, T. Kröll, D. Reygadas-Tello, E. Adamska, J. Ljungvall, V. Guadilla, A. Korgul, Y. Popovitch, W. Paulsen, I. Homm, D. Thisse, M. L. Cortés, M. Heine, Fabio Zeiser, C. Delafosse, V. Sánchez-Tembleque, P. Davies, M. Yavachova, S. Ziliani, and D. Etasse

Subjects
Physics, Spectrometer, 010308 nuclear & particles physics, Fission, Astrophysics::High Energy Astrophysical Phenomena, Yrast, Nuclear Theory, 01 natural sciences, 7. Clean energy, Atomic orbital, Nuclear fission, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Spin (physics), Spectroscopy
Abstract

Prompt and delayed γ -ray spectroscopy of the neutron-rich 94 Kr was performed, as part of the fission campaign at the ALTO facility of the IPN Orsay, using the fast-neutron-induced fission reaction 238 U ( n , f ) in combination with the ν -Ball array, a novel hybrid γ spectrometer for energy and lifetime measurements. Several new yrast and nonyrast transitions were observed for the first time, extending the previously known level scheme. Additionally, we report on the observation of a new short-lived isomer at 3444 keV with a half-life of 32(3) ns. The analysis of the Nilsson orbitals obtained from Gogny cranked Hartree-Fock-Bogoliubov calculations suggests a ( 9 − ) spin and an oblate deformation for this isomer corresponding to a two-quasineutron state, indicating an isomeric structure very similar to that of the neighboring isotones 96 Sr and 92 Se

Published
2020
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14. Simultaneous measurements of the β -neutrino angular correlation in Ar32 pure Fermi and pure Gamow-Teller transitions using β -proton coincidences

Author

V. Araujo-Escalona, D. Zákoucký, E. Liénard, P. Ascher, P. Alfaurt, Nathal Severijns, Xavier Flechard, J. Giovinazzo, T. Kurtukian-Nieto, M. Gerbaux, G. Quéméner, M. Versteegen, Dinko Atanasov, S. Grévy, L. Daudin, B. Blank, and S. Vanlangendonck

Subjects
Semileptonic decay, Physics, Proton, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Weak interaction, Kinetic energy, 01 natural sciences, 7. Clean energy, Beta decay, Standard Model, 0103 physical sciences, High Energy Physics::Experiment, Atomic physics, Neutrino, Proton emission, Nuclear Experiment, 010306 general physics
Abstract

We report first time measurements of the beta-neutrino angular correlation based on the kinetic energy shift of protons emitted in parallel or anti-parallel directions with respect to the positron in the beta decay of $^{32}$Ar. This proof of principle experiment provided simultaneous measurements for the superallowed 0$^+$~$\rightarrow$~0$^+$ transition followed by a 3356~keV proton emission and for a Gamow-Teller transition followed by a 2123~keV proton emission. The results, respectively ${\tilde a_{\beta\nu}}=1.01(3)_{(stat)}(2)_{(syst)}$ and ${\tilde a_{\beta\nu}}=-0.22(9)_{(stat)}(2)_{(syst)}$, are found in agreement with the Standard Model. A careful analysis of the data shows that future measurements can reach a precision level of 10$^{-3}$ for both pure Fermi and pure Gamow-Teller decay channels, providing new constraints on both scalar and tensor weak interactions.

Published
2020
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15. Studying the Exotic Decay $^{70}Kr$ $\rightarrow$ $^{70}Br$

Author

Daiki Nishimura, G. de Angelis, Hiroyoshi Sakurai, Y. Shimizu, P. A. Söderström, Shunji Nishimura, S. Yagi, C. Magron, J. Agramunt, V. Guadilla, JJ Liu, H. Oikawa, S. M. Lenzi, Y. Takei, N. Kurz, W. Gelletly, S. Chen, A. I. Morales, F. Recchia, E. Ganioglu, J. Giovinazzo, H. Baba, Y. Fujita, V. H. Phong, Gabor Kiss, F. Diel, T. Goigoux, H. Suzuki, D. S. Ahn, Zs. Dombradi, T. Kurtukian Nieto, Jin Wu, P. Aguilera, J. Eberth, N. Fukuda, Jenny Lee, B. Rubio, F. Molina, T. Isobe, P. J. Davies, I. Kojouharov, P. Ascher, M. Tanaka, Alejandro Algora, Naohito Inabe, B. Blank, Toshiyuki Sumikama, Hiroyuki Takeda, S. E.A. Orrigo, P. Doornebal, A. Montaner-Pizá, D. Lubos, C. Borcea, D. R. Napoli, M. Gerbaux, H. Shaffner, S. Grévy, W. Korten, A. Horvath, Toshiyuki Kubo, A. Boso, Shigeru Kubono, A. Vitez-Sveiczer, T. Lokotko, 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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 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), 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 physics, Physics, 010308 nuclear & particles physics, 0103 physical sciences, General Physics and Astronomy, ddc:530, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences
Abstract

Acta physica Polonica / B 51(3), 587 (2020). doi:10.5506/APhysPolB.51.587, Published by Inst. of Physics, Jagellonian Univ., Cracow

Published
2020
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16. Branching ratio of the super-allowed $\beta$ decay of $^{10}$C

Author

J. Giovinazzo, B. Blank, P. Ascher, M. R. Dunlop, A. T. Laffoley, M. Gerbaux, S. Grévy, T. Kurtukian Nieto, R. Dunlop, P. Finlay, M. Aouadi, G. F. Grinyer, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), and 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)

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Branching fraction, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Order (ring theory), FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, Beta decay, Semiconductor detector, Nuclear physics, 0103 physical sciences, Nuclear fusion, Physics::Accelerator Physics, Beta (velocity), Nuclear Physics - Experiment, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract

In an experiment performed at the ISOLDE facility of CERN, the super-allowed $\beta $-decay branching ratio of $^{10}$C was determined with a high-precision single-crystal germanium detector. In order to evaluate the contribution of the pile-up of two 511 keV $\gamma $ quanta to one of the $\gamma $-ray peaks of interest at 1021.7 keV, data were not only taken with $^{10}$C, but also with a $^{19}$Ne beam. The final result for the super-allowed decay branch is 1.4638(50)%, in agreement with the average from literature. In an experiment performed at the ISOLDE facility of CERN, the super-allowed beta-decay branching ratio of 10C was determined with a high-precision single-crystal germanium detector. In order to evaluate the contribution of the pile-up of two 511 keV gamma quanta to one of the gamma-ray peaks of interest at 1021.7 keV, data were not only taken with 10C, but also with a 19Ne beam. The final result for the super-allowed decay branch is 1.4638(50)%, in agreement with the average from literature.

Published
2020
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17. Precision efficiency calibration of a high-purity co-axial germanium detector at low energies

Author

B. Blank, P. Ascher, J. C. Thomas, M. Gerbaux, T. Kurtukian Nieto, S. Grévy, M. Versteegen, J. Giovinazzo, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), 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 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), 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, Photon, Period (periodic table), Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, FOS: Physical sciences, chemistry.chemical_element, Germanium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 0103 physical sciences, Calibration, Gamma spectroscopy, Gamma-ray spectroscopy, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), 010306 general physics, gamma ray: irradiation, Nuclear Experiment, Instrumentation, semiconductor detector: germanium, Physics, Range (particle radiation), 010308 nuclear & particles physics, Germanium detector, Instrumentation and Detectors (physics.ins-det), Monte-Carlo simulations, stability, calibration, Computational physics, Semiconductor detector, chemistry, efficiency, High Energy Physics::Experiment, numerical calculations: Monte Carlo
Abstract

International audience; Following work done in the energy region above 100 keV, the high-precision calibration of a co-axial high-purity germanium detector has been continued in the energy region below 100 keV. Some of the previous measurements and Monte-Carlo simulations have been repeated with higher statistics and a new source measurement with 169 Yb has been added. For the energy range from 40 keV to 100 keV, an absolute precision for the detection efficiency of ± 0.2% has been reached, as previously obtained for energies above 100 keV. The low-energy behaviour of the germanium detector was further scrutinised by studying the germanium X-ray escape probability for the detection of low-energy photons. In addition, one experimental point, a γ ray at 2168 keV from the decay of 38 K, has been included for the total-to-peak ratios agreeing well with simulations. The same γ ray was also added for the single- and double-escape probabilities. Finally, the long term stability of the efficiency of the germanium detector was investigated by regularly measuring the full-energy peak efficiency with a precisely calibrated 60 Co source and found to be perfectly stable over a period of 10 years.

Published
2020
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18. $\gamma$-ray Spectroscopy of $^{85}$Se Produced in $^{232}$Th Fission

Author

I. Homm, M. Ciemała, Stephan Oberstedt, K. Rezynkina, P. A. Söderström, B. Fornal, A. Lopez-Martens, M. Bunce, V. Vedia, D. Verney, J. N. Wilson, J. Nemer, B. Wasilewska, A. Algora, M. Babo, R. B. Gerst, L. M. Fraile, Y. Popovitch, R. Chakma, T. Kurtukian-Nieto, Ł. W. Iskra, W. Paulsen, E. Adamska, D. Ralet, G. Häfner, M. Piersa, G. Benzoni, M. Rudigier, A. Fijałkowska, A. Blazhev, S. Leoni, D. Reygadas Tello, K. Hauschild, P. H. Regan, M. S. Yavahchova, J. Wiederhold, V. Guadilla, N. Warr, C. Delafosse, C. Schmitt, R.L. Canavan, V. Sánchez-Tembleque, K. Miernik, R. Lozeva, I. Matea, P. Davies, Muriel Fallot, N. Jovančević, S. Bottoni, M. Lebois, N. Cieplicka-Oryńczak, P. Adsley, C. Henrich, G. Tocabens, K. Belvedere, D. Gjestvang, T. Kröll, L. Cortes, C. Sürder, L. Qi, S. M. Collins, D. Etasse, M. Heine, Fabio Zeiser, A. Boso, F. Ibrahim, J. Benito, A. Korgul, J. Ljungvall, D. Thisse, L. Le-meur, A. Gottardo, P. Koseoglou, 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), 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), 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), Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), 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), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), 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), 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 Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique), 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 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), 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, Spectrometer, Isotope, 010308 nuclear & particles physics, Fission, Yrast, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Aucun, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, Excited state, 0103 physical sciences, Neutron source, Gamma spectroscopy, Nuclear Experiment
Abstract

International audience; Excited states in the neutron-rich 85Se nucleus have been studied using for the first time a fast neutron-induced fission of 232Th. The experiment was performed at the ALTO facility of the IPN Orsay. Coupling of the LICORNE directional neutron source with the ν-ball high-resolution γ-ray spectrometer provided unique access to high-spin states in neutron-rich fission fragments from the 232Th(n, f) reaction. A preliminary level scheme of 85Se was established by the analysis of prompt γ–γ–γ coincidences. Identification of the all known yrast states in 85Se is the first step towards studies of more neutron-rich Se isotopes.

Published
2019
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19. Scalar current limit from the beta-neutrino correlation: the WISArD experiment

Author

E. Liénard, M. Gerbaux, P. Alfaurt, Nathal Severijns, D. Zakoucky, S. Vanlangendonck, X. Fléchard, Dinko Atanasov, V. Araujo-Escalona, J. Giovinazzo, M. Versteegen, M. Roche, S. Grévy, G. Quéméner, L. Nies, T. Kurtukian Nieto, B. Blank, L. Daudin, P. Ascher, P. Wagenknecht, 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), 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), 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
History, CERN Lab, magnetic field: high, Physics::Instrumentation and Detectors, Physics beyond the Standard Model, Scalar (mathematics), Weak interaction, 01 natural sciences, Education, Nuclear physics, weak interaction, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, 010306 general physics, Nuclear Experiment, numerical calculations, neutrino: interaction, Physics, nucleus: semileptonic decay, 010308 nuclear & particles physics, new physics, sensitivity, Computer Science Applications, Magnetic field, current: scalar, Beta (plasma physics), radioactivity, Physics::Accelerator Physics, Neutrino, Ground state, Particle Physics - Experiment, Fermi Gamma-ray Space Telescope
Abstract

Beta - neutrino correlation measurements are key in the research of physics beyond the Standard Model. In pure Fermi beta transitions, the beta-neutrino correlation coefficient, a βν, is sensitive to the presence of scalar currents. The present limits were established by experimental studies of various nuclear systems with allowed Fermi transitions. A new experiment to improve the constraints on scalar currents is being developed, by the WISArD collaboration at ISOLDE/CERN, where the aim is to measure the energy shift of the β-delayed protons emitted from the isobaric analogue state of the 32Ar ground state. To enhance the sensitivity, protons and positrons are guided by a strong magnetic field and measured in coincidence between the two detection configurations located on both sides of a catcher foil in which the radioactive samples are implanted. Kinematic energy shifts of the protons in coincidence with positrons, in the same or opposite hemisphere of the catcher foil, will be more or less pronounced as a function of the possible scalar current component of the weak interaction. Details of the apparatus and preliminary results of the experiment are presented.

Published
2019
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20. Spectroscopy of Neutron Induced Reactions with the $\nu $-ball Spectrometer

Author

S. Bottoni, M. Lebois, L. Qi, D. Reygadas Tello, R. Shearman, I. Homm, R. B. Gerst, J. N. Wilson, T. Kröll, D. Verney, A. Boso, A. Oberstedt, I. Matea, P. Koseoglou, P. A. Söderström, M. Babo, G. Häfner, M. Piersa, D. Thisse, B. Fornal, M. Rudigier, V. Sanchez, J. Wiederhold, C. Henrich, P. H. Regan, A. Lopez-Martens, F. Ibrahim, K. Miernik, J. Ljungvall, N. Cieplicka-Oryńczak, M. Diakaki, P. Inavov, A. Algora, C. Delafosse, N. Warr, G. Tocabens, J. Benito Garcia, K. Belvedere, S. Leoni, Y. Popovitch, Muriel Fallot, J. Nemer, K. Rezynkina, W. Paulson, C. Sürder, M. Bunce, D. Gestvang, D. Knezevic, V. Guadilla-Gomez, K. Hauschild, Zs. Podolyák, L. Cortes, D. Ralet, A. Gottardo, A. Dragic, E. Adamska, G. Benzoni, R. Lozeva, R. Chakma, N. Jovančević, S. Oberstedt, R. Canavan, F. Adsley, P. Davies, M. Yavachova, C. Schmitt, M. Heine, Fabio Zeiser, D. Etasse, L. M. Fraile, T. Kurtukian-Nieto, A. Blazhev, L. Iskra, 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), Université Paris-Saclay, 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), 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), Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), 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), 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 Nantes - Faculté des Sciences et des Techniques, and Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique)

Subjects
Physics, education.field_of_study, Spectrometer, 010308 nuclear & particles physics, Fission, Astrophysics::High Energy Astrophysical Phenomena, Population, Aucun, General Physics and Astronomy, Shields, chemistry.chemical_element, Germanium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, chemistry, 0103 physical sciences, Neutron source, Neutron, Atomic physics, 010306 general physics, education, Spectroscopy, Nuclear Experiment
Abstract

The ʋ-ball is a high-efficiency hybrid spectrometer which consists of both germanium (Ge) detectors and associated anti-Compton BGO shields, coupled to lanthanum bromide (LaBr3) detectors. The hybrid configuration provides a combination of both excellent energy and timing resolutions. The ʋ-ball geometry allows the coupling with the LICORNE directional neutron source at the ALTO facility of the IPN, Orsay. This opens the possibility to perform precise spectroscopy of neutron induced reactions and was used for two experiments during the recent experimental campaign. These two experiments are described here: 1. Spectroscopy of the neutron-rich fission fragments produced in the 238U(n; f) and 232Th(n; f) reactions; 2. Spectroscopy above the shape isomer in 238U. The 238U(n; f) and 232Th(n; f) reactions produce hundreds of neutron-rich nuclei on which gamma-ray spectroscopy can be performed. The main goal of the experiment aiming to populate the shape isomer in 238U is the measurement of the gamma-ray and fission decay branches as well as determination of level scheme in the super-deformed minimum. The shape isomer is populated by 238U(n; n') reaction, which gives a very advantageous population cross section over other reactions. More detailed descriptions of these two ʋ-ball experiments will be presented here.

Published
2019
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21. $^{67}$Kr Two-proton Radioactivity: Results and Theoretical Interpretations

Author

P. Ascher, J. Giovinazzo, C. Borcea, Daiki Nishimura, G. de Angelis, A. I. Morales, Y. Fujita, Toshiyuki Kubo, W. Gelletly, Shunji Nishimura, D. S. Ahn, V. Guadilla, Gabor Kiss, P. A. Söderström, A. Boso, S. Yagi, H. Suzuki, D. Lubos, Jorge Agramunt, Hiroyoshi Sakurai, Shigeru Kubono, Shintaro Go, R. B. Cakirli, H. Oikawa, S.E.A. Orrigo, Y. Shimizu, C. Sidong, A. Algora, T. Kurtukian Nieto, C. Magron, S. Grévy, J. Chiba, Kathrin Wimmer, P. Doornenbal, P. Aguilera, B. A. Brown, M. Gerbaux, P. Vi, F. Diel, Jin Wu, T. Goigoux, Y. Takei, D. R. Napoli, Berta Rubio, F. Molina, Naohito Inabe, N. Fukuda, B. Blank, Toshiyuki Sumikama, Hiroyuki Takeda, M. Tanaka, E. Ganioglu, A. Montaner-Piza, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), 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), 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 physics, Proton, Decay energy, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Branching fraction, Nuclear structure, General Physics and Astronomy, Deformation (meteorology), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy
Abstract

International audience; The two-proton radioactivity is a unique tool to study the nuclear structure beyond the proton drip-line. Since its discovery in 2002, the known emitters have been 19Mg, 45Fe, 48Ni, 54Zn and 67Kr. 67Kr was observed for the first time at the RIKEN Nishina Center in 2015. Its decay energy was measured at 1690(17) keV with a branching ratio of 37(14)%. The half-life, 7.4(30) ms, was found in contradiction with theoretical calculations, pointing out effects of decay dynamics and nuclear deformation.

Published
2018
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22. High-precision efficiency calibration of a high-purity co-axial germanium detector

Author

T. Kurtukian Nieto, J. Giovinazzo, J. Souin, H. Guérin, B. Blank, J. C. Thomas, I. Matea, G. Canchel, G. F. Grinyer, M. Gerbaux, L. Audirac, S. Grévy, H. Bouzomita, P. Ascher, P. Delahaye, Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), 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), GANILEXP, Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université 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), 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, Monte Carlo method, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Crystal, Optics, Calibration, Gamma spectroscopy, Gamma-ray spectroscopy, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), Nuclear Experiment, Instrumentation, Physics, Monte-Carlosimulations, business.industry, Detector, Germanium detector, Instrumentation and Detectors (physics.ins-det), Semiconductor detector, Super-allowed beta transitions, High Energy Physics::Experiment, Coaxial, business, Energy (signal processing)
Abstract

Expérience GANIL; International audience; A high-purity co-axial germanium detector has been calibrated in efficiency to a precision of about 0.15% over a wide energy range. High-precision scans of the detector crystal and gamma-ray source measurements have been compared to Monte-Carlo simulations to adjust the dimensions of a detector model. For this purpose, standard calibration sources and short-lived on-line sources have been used. The resulting efficiency calibration reaches the precision needed e.g. for branching ratio measurements of super-allowed beta decays for tests of the weak-interaction standard model.

Published
2015
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23. Gamma-ray branching ratios in the decay of $^{49}$Cr

Author

J. Giovinazzo, B. Blank, P. Ascher, T. Kurtukian Nieto, A. de Roubin, Karl Johnston, T. Goigoux, M. Aouadi, M. Gerbaux, S. Grévy, C. Magron, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), and 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)

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, Large Hadron Collider, 010308 nuclear & particles physics, Hadron, Gamma ray, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Branching (polymer chemistry), 01 natural sciences, Semiconductor detector, Nuclear physics, 0103 physical sciences, Nuclear fusion, Experimental work, High Energy Physics::Experiment, 010306 general physics
Abstract

The $\gamma$ -decay branching ratios of 49V have been studied in the $\beta$ /EC decay of 49Cr. The $\gamma$ -ray spectrum has been measured with a 70% relative efficiency co-axial germanium detector calibrated in efficiency with a precision of about 0.5%. The primary result is the measurement of the relative branching ratios of the three main $\gamma$ rays in the decay of 49Cr. Large discrepancies were found with a previous experimental work. The 49Cr sample was produced by proton impact on a ZrO2 target and collected at the ISOLDE facility of CERN and enabled us to re-evaluate the decay scheme of 49Cr. The new data allow the use of this nucleus for future high-precision calibration work.

Published
2018
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24. Precise measurements of half-lives and branching ratios for the $ \beta$ β mirror transitions in the decay of 23Mg and 27Si

Author

T. Kurtukian Nieto, P. Alfaurt, Ilkka Pohjalainen, Sami Rinta-Antila, B. Blank, Heikki Penttilä, Jukka Koponen, Tommi Eronen, L. Daudin, Juuso Reinikainen, S. Grévy, M. Roche, N. A. Smirnova, Annika Voss, J. Giovinazzo, M. Gerbaux, Jani Hakala, C. Magron, Iain Moore, Mikael Reponen, B. Thomas, Veli Kolhinen, Dmitry Gorelov, A. de Roubin, L. Xayavong, and H. Guérin

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Branching fraction, Electron capture, Hadron, 01 natural sciences, Isospin, 0103 physical sciences, Isotopes of silicon, Atomic physics, 010306 general physics, Isotopes of magnesium, Radioactive decay, Dimensionless quantity
Abstract

Half-lives and branching ratios for the two mirror $ \beta$ decays of$^{23}$Mg and$^{27}$Si have been measured at the University of Jyvaskyla with the IGISOL facility. The results obtained, $ T_{1/2}=11.303(3)$ s and $ T_{1/2}= 4.112(2)$ s for the half-lives of$^{23}$Mg and$^{27}$Si , respectively, are 7 and 8 times more precise than the averages of previous measurements. The values obtained for the super-allowed branching ratios of$^{23}$Mg and$^{27}$Si are $ B.R.=92.18(8)\%$ and $ B.R.=99.74(2)\%$ , respectively. The result for$^{23}$Mg is three times more precise than the average of the previous measurements, while for$^{27}$Si the precision has not been improved, the average of the previous measurements being already very precise. Isospin-symmetry-breaking corrections have been calculated for the two nuclei to determine the corrected $ {F}t$ value.

Published
2017
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25. Two-proton Radioactivity: the Interesting Case of \(^{67}\)Kr and Further Studies

Author

N. Fukuda, Y. Fujita, B. Blank, Toshiyuki Sumikama, Hiroyuki Takeda, P. A. Söderström, Toshiyuki Kubo, P. Ascher, Kathrin Wimmer, D. S. Ahn, S. Grévy, Shunji Nishimura, A. Boso, S. Yagi, R. B. Cakirli, Shintaro Go, W. Gelletly, C. Sidong, Shigeru Kubono, C. Borcea, Jin Wu, A. Algora, C. Magron, H. Suzuki, Gabor Kiss, J. Giovinazzo, H. Oikawa, J. Chiba, P. Doornenbal, Y. Takei, P. Aguilera, V. Guadilla, A. I. Morales, S.E.A. Orrigo, Daiki Nishimura, G. de Angelis, M. Gerbaux, Naohito Inabe, Hiroyoshi Sakurai, B. A. Brown, P. Vi, Y. Shimizu, F. Diel, D. R. Napoli, Berta Rubio, F. Molina, T. Kurtukian-Nieto, D. Lubos, Jorge Agramunt, M. Tanaka, E. Ganioglu, A. Montaner-Piza, T. Goigoux, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), 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), 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), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Isotope, Proton, 010308 nuclear & particles physics, Nuclear Theory, Theoretical models, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Physics::Accelerator Physics, Nuclear Experiment, 010306 general physics
Abstract

International audience; We report on the observation of 67Kr that has been produced in an experiment performed at the RIKEN/BigRIPS facility. The two-proton decay of 67Kr has been evidenced and this nucleus is thus the fourth observed long lived ground-state two-proton emitter, after 45Fe, 48Ni and 54Zn. In addition, the decay of several isotopes in the mass region has been investigated. While for previous cases of two-proton radioactivity, the theoretical models could reproduce the measured data, this is not the case anymore for 67Kr. Two interpretations have been proposed to explain this discrepancy: a transition between real two-proton and sequential decay or the influence of deformation. These hypotheses will be tested in future experiments by measuring the angular and energy correlations of the emitted protons.

Published
2020
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26. Beta Decay Study of the Tz=−2 56Zn Nucleus and the Determination of the Half-Lives of a Few fp-shell Nuclei

Author

B. Rubio, S.E.A. Orrigo, L. Kucuk, A. Montaner-Pizá, Y. Fujita, H. Fujita, B. Blank, W. Gelletly, T. Adachi, J. Agramunt, A. Algora, P. Ascher, B. Bilgier, L. Cáceres, R.B. Cakirli, G. de France, E. Ganioğlu, M. Gerbaux, J. Giovinazzo, S. Grevy, O. Kamalou, H.C. Kozer, T. Kurtukian-Nieto, F.M. Marqués, F. Molina, Y. Oktem, F. de Oliveira Santos, L. Perrot, L. Popescu, R. Raabe, A.M. Rogers, P.C. Srivastava, G. Susoy, T. Suzuki, A. Tamii, and J.C. Thomas

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, Nuclear Theory, Nuclear data, Half-life, Beta decay, Nuclear physics, medicine.anatomical_structure, Fragmentation (mass spectrometry), Double beta decay, medicine, Mirror nuclei, Atomic physics, Nuclear Experiment, Nucleus
Abstract

This paper concerns the experimental study of the β decay properties of few proton-rich fp -shell nuclei. The nuclei were produced at GANIL in fragmentation reactions, separated with the LISE spectrometer and stopped in an implantation detector surrounded by Ge detectors. The β -delayed gammas, β -delayed protons and the exotic β -delayed gamma-proton emission have been studied. Preliminary results are presented. The decay of the T z = − 2 nucleus 56 Zn has been studied in detail. Information from the β -delayed protons and β -delayed gammas has been used to deduce the decay scheme. The exotic beta-delayed gamma-proton decay has been observed for the first time in the fp -shell. The interpretation of the data was made possible thanks to the detailed knowledge of the mirror Charge Exchange (CE) process and the gamma de-excitation of the states in 56 Co, the mirror nucleus of 56 Cu.

Published
2014
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27. Upgrade of the SPIRAL identification station for high-precision measurements of nuclear β decay

Author

P. Delahaye, H. Bouzomita, D. Pérez-Loureiro, R. A. E. Austin, F Bucaille, Julien Gibelin, J. C. Thomas, T. Kurtukian-Nieto, B. Blank, G. C. Ball, G. Frémont, A. Lefevre, F. Legruel, K. G. Leach, J. Giovinazzo, A. T Laffoley, G. F. Grinyer, G Lescalie, P. Finlay, J Grinyer, 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), Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université 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), Department of Astronomy and Physics [Halifax], Saint Mary's University [Halifax], TRIUMF [Vancouver], Instituut voor Kern-en Stralingsfysica (IKS), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), 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), Department of Physics [Guelph], University of Guelph, 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), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université 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), 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
Physics, Tape transport system, Nuclear and High Energy Physics, Particle physics, Branching ratios, Electroweak interaction, Superallowed Fermi β decay, Q3 Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Half-lives, Nuclear physics, Upgrade, Isospin, Mirror β decay, Geant4 simulations, Design study, Physics::Accelerator Physics, High Energy Physics::Experiment, Ion trap, Instrumentation, Spiral, Fermi Gamma-ray Space Telescope
Abstract

The low-energy identification station at SPIRAL (Systeme de Production d'Ions Radioactifs Acceleres en Ligne) has been upgraded for studying the β decays of short-lived radioactive isotopes and to perform high-precision half-life and branching-ratio measurements for superallowed Fermi and isospin T= 1 / 2 mirror β decays. These new capabilities, combined with an existing Paul trap setup for measurements of β–ν angular-correlation coefficients, provide a powerful facility for investigating fundamental properties of the electroweak interaction through nuclear β decays. A detailed description of the design study, construction, and first results obtained from an in-beam commissioning experiment on the β+ decays 14 O and 17F are presented.

Published
2014
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28. Observation of the 2+ isomer in Co52

Author

J. C. Thomas, J. Giovinazzo, B. Rubio, P. Ascher, M. Gerbaux, L. Popescu, A. M. Rogers, W. Gelletly, F. Molina, H. C. Kozer, J. Agramunt, L. Kucuk, Y. Fujita, E. Ganioǧlu, G. Susoy, L. Caceres, Takashi Suzuki, C. Stodel, Alejandro Algora, R. B. Cakirli, B. Bilgier, S. Grévy, Atsushi Tamii, T. Kurtukian-Nieto, B. Blank, O. Kamalou, and S. E.A. Orrigo

Subjects
Physics, 010308 nuclear & particles physics, 0103 physical sciences, Atomic physics, 010306 general physics, Ground state, 01 natural sciences
Abstract

We report the first observation of the ${2}^{+}$ isomer in $^{52}\mathrm{Co}$, produced in the $\ensuremath{\beta}$ decay of the ${0}^{+}$, $^{52}\mathrm{Ni}$ ground state. We have observed three $\ensuremath{\gamma}$ rays at 849, 1910, and 5185 keV characterizing the $\ensuremath{\beta}$ de-excitation of the isomer. We have measured a half-life of 102(6) ms for the isomeric state. The Fermi and Gamow-Teller transition strengths for the $\ensuremath{\beta}$ decay of $^{52m}\mathrm{Co}$ to $^{52}\mathrm{Fe}$ have been determined. We also add new information on the $\ensuremath{\beta}$ decay of the ${6}^{+}$, $^{52}\mathrm{Co}$ ground state, for which we have measured a half-life of 112(3) ms.

Published
2016
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29. Two-Proton Radioactivity ofKr67

Author

C. Magron, R. B. Cakirli, Daiki Nishimura, G. de Angelis, Toshiyuki Kubo, V. H. Phong, Shunji Nishimura, D. S. Ahn, D. Lubos, P. Ascher, S. Yagi, Hiroyoshi Sakurai, A. Boso, J. Agramunt, V. Guadilla, W. Gelletly, J. Chiba, Y. Shimizu, Shigeru Kubono, B. A. Brown, J. Giovinazzo, F. Diel, H. Oikawa, Y. Fujita, A. Montaner-Pizá, Gabor Kiss, T. Goigoux, C. Borcea, P. Aguilera, Shintaro Go, F. Molina, A. I. Morales, P. A. Söderström, T. Kurtukian Nieto, P. Doornenbal, Momoko Tanaka, Naohito Inabe, M. Gerbaux, S. Grévy, D. R. Napoli, B. Rubio, Kathrin Wimmer, N. Fukuda, B. Blank, Toshiyuki Sumikama, Hiroyuki Takeda, S. E.A. Orrigo, Jin Wu, Y. Takei, E. Ganioglu, H. Suzuki, and Alejandro Algora

Subjects
Physics, Proton, 010308 nuclear & particles physics, Branching fraction, Q value, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Nuclear physics, Decay energy, 0103 physical sciences, Atomic physics, 010306 general physics, Common emitter, Line (formation)
Abstract

In an experiment with the BigRIPS separator at the RIKEN Nishina Center, we observed two-proton (2p) emission from 67Kr. At the same time, no evidence for 2p emission of 59Ge and 63Se, two other potential candidates for this exotic radioactivity, could be observed. This observation is in line with Q value predictions which pointed to 67Kr as being the best new candidate among the three for two-proton radioactivity. 67Kr is only the fourth 2p ground-state emitter to be observed with a half-life of the order of a few milliseconds. The decay energy was determined to be 1690(17) keV, the 2p emission branching ratio is 37(14)%, and the half-life of 67Kr is 7.4(30) ms.

Published
2016
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30. Two-Proton Radioactivity of $^{67}$Kr

Author

T, Goigoux, P, Ascher, B, Blank, M, Gerbaux, J, Giovinazzo, S, Grévy, T, Kurtukian Nieto, C, Magron, P, Doornenbal, G G, Kiss, S, Nishimura, P-A, Söderström, V H, Phong, J, Wu, D S, Ahn, N, Fukuda, N, Inabe, T, Kubo, S, Kubono, H, Sakurai, Y, Shimizu, T, Sumikama, H, Suzuki, H, Takeda, J, Agramunt, A, Algora, V, Guadilla, A, Montaner-Piza, A I, Morales, S E A, Orrigo, B, Rubio, Y, Fujita, M, Tanaka, W, Gelletly, P, Aguilera, F, Molina, F, Diel, D, Lubos, G, de Angelis, D, Napoli, C, Borcea, A, Boso, R B, Cakirli, E, Ganioglu, J, Chiba, D, Nishimura, H, Oikawa, Y, Takei, S, Yagi, K, Wimmer, G, de France, S, Go, B A, Brown, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), 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), 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), 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

In an experiment with the BigRIPS separator at the RIKEN Nishina Center, we observed two-proton (2p) emission from ^{67}Kr. At the same time, no evidence for 2p emission of ^{59}Ge and ^{63}Se, two other potential candidates for this exotic radioactivity, could be observed. This observation is in line with Q value predictions which pointed to ^{67}Kr as being the best new candidate among the three for two-proton radioactivity. ^{67}Kr is only the fourth 2p ground-state emitter to be observed with a half-life of the order of a few milliseconds. The decay energy was determined to be 1690(17) keV, the 2p emission branching ratio is 37(14)%, and the half-life of ^{67}Kr is 7.4(30) ms.

Published
2016
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31. Two-proton radioactivity of $^{67}$Kr

Author

T. Goigoux, P. Ascher, B. Blank, M. Gerbaux, J. Giovinazzo, S. Grévy, T. Kurtukian Nieto, C. Magron, J. Agramunt, A. Algora, V. Guadilla, A. Montaner-Piza, A. I. Morales, S. E. A. Orrigo, B. Rubio, D. S. Ahn, P. Doornenbal, N. Fukuda, N. Inabe, G. G. Kiss, T. Kubo, S. Kubono, S. Nishimura, H. Sakurai, Y. Shimizu, C. Sidong, P.-A. Söderström, T. Sumikama, H. Suzuki, H. Takeda, P. Vi, J. Wu, Y. Fujita, M. Tanaka, W. Gelletly, P. Aguilera, F. Molina, F. Diel, D. Lubos, G. de Angelis, D. Napoli, C. Borcea, A. Boso, R. B. Cakirli, E. Ganioglu, J. Chiba, D. Nishimura, H. Oikawa, Y. Takei, S. Yagi, K. Wimmer, G. de France, S. Go, B. A. Brown, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), 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), Yu. E. Penionzhkevich, Yu.G. Sobolev, 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), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, RIKEN, Proton, 010308 nuclear & particles physics, Radiochemistry, EURICA, Two-proton, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, WAS3ABi, Radioactivity, 0103 physical sciences, 010306 general physics, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2016
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32. Beta Decay Studies of Proton Rich Nuclei, an Important Ingredient for rp-Process Calculations

Author

B. Rubio, L. Kucuk, S. E. A. Orrigo, Y. Fujita, W. Gelletly, B. Blank, T. Adachi, P. Aguilera, J. Agramunt, A. Algora, P. Ascher, B. Bilgier, L. Cáceres, R. B. Cakirli, G. de France, F. de Oliveira Santos, H. Fujita, E. Ganioğlu, M. Gerbaux, J. Giovinazzo, S. Grévy, O. Kamalou, H. C. Kozer, T. Kurtukian-Nieto, M. Marqués, F. Molina, D. Nishimura, H. Oikawa, Y. Oktem, L. Perrot, L. Popescu, R. Raabe, A. M. Rogers, P. C. Srivastava, G. Susoy, C. Stodel, T. Suzuki, A. Tamii, J. C. Thomas, Instituto de Fisica Corpuscular ( IFIC ), Consejo Superior de Investigaciones Científicas [Spain] ( CSIC ) -Universitat de València ( UV ), Istanbul University, Research Center for Nuclear Physics ( RCNP ), Osaka University [Osaka], Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, 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 ), Istambul University, Grand Accélérateur National d'Ions Lourds ( GANIL ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de physique corpusculaire de Caen ( LPCC ), Université de Caen Normandie ( UNICAEN ), Normandie Université ( NU ) -Normandie Université ( NU ) -Ecole 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 ), Department of Physics, Tokyo University of Science, Noda, Chiba, Laboratoire de psychologie de Caen Normandie ( LPCN ), Normandie Université ( NU ) -Normandie Université ( NU ), Centre d'Etude de l'Energie Nucléaire ( SCK-CEN ), Argonne National Laboratory (ANL) - Physics Division (PHY), Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), Research Center for Nuclear Physics (RCNP), University of Surrey (UNIS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique 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), Centre d'Etude de l'Energie Nucléaire (SCK-CEN), 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 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 Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Proton, 010308 nuclear & particles physics, Chemistry, Radiochemistry, rp-process, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Beta decay, Nuclear physics, Ingredient, 0103 physical sciences, beta decay experiments, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, fragmentation facilities
Abstract

International audience; We have performed a series of beta-decay experiments at fragmentation facilities on T$_z$ = −1/2, T$_z$ = −1, and T$_z$ = −2 nuclei. Most of these nuclei lie on the rp-process path and therefore some of the quantities we have measured such as T$_{1/2}$ values are important ingredients in performing reaction flow calculations for light curve estimates and testing astrophysical models of X-ray bursters. At this conference we have presented the results of measurements of T$_{1/2}$ values for 25 nuclei and compared with previous values.

Published
2016
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33. New neutron-deficient isotopes from $^{78}$Kr fragmentation

Author

Shigeru Kubono, Daiki Nishimura, G. de Angelis, Y. Fujita, M. Gerbaux, Hiroyoshi Sakurai, C. Borcea, D. S. Ahn, J. Chiba, Shunji Nishimura, D. Lubos, C. Magron, D. R. Napoli, S. Yagi, H. Suzuki, B. Rubio, J. Agramunt, V. Guadilla, P. A. Söderström, P. Ascher, Toshiyuki Kubo, Naohito Inabe, Jin Wu, Y. Shimizu, H. Oikawa, J. Giovinazzo, Shintaro Go, A. Boso, W. Gelletly, Alejandro Algora, Kathrin Wimmer, F. Diel, Gabor Kiss, F. Molina, R. B. Cakirli, V. H. Phong, T. Kurtukian Nieto, Y. Takei, E. Ganioglu, S. Grévy, N. Fukuda, B. Blank, Toshiyuki Sumikama, P. Doornenbal, Hiroyuki Takeda, S. E.A. Orrigo, T. Goigoux, M. Tanaka, P. Aguilera, A. I. Morales, A. Montaner-Pizá, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), Horia Hulubei National Institute of Physics and Nuclear Engineering (NIPNE), IFIN-HH, 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), 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), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Isotope, 010308 nuclear & particles physics, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Spectral line, Nuclear physics, Fragmentation (mass spectrometry), 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), Atomic physics, 010306 general physics, Nuclear Experiment
Abstract

In an experiment with the BigRIPS separator at the RIKEN Nishina Center, the fragmentation of a $^{78}$Kr beam allowed the observation of new neutron-deficient isotopes at the proton drip-line. Clean identification spectra could be produced and $^{63}$Se, $^{67}$Kr, and $^{68}$Kr were identified for the first time. In addition, $^{59}$Ge was also observed. Three of these isotopes, $^{59}$Ge, $^{63}$Se, and $^{67}$Kr, are potential candidates for ground-state two-proton radioactivity. In addition, the isotopes $^{58}$Ge, $^{62}$Se, and $^{66}$Kr were also sought but without success. The present experiment also allowed the determination of production cross sections for some of the most exotic isotopes. These measurements confirm the trend already observed that the empirical parameterization of fragmentation cross sections, EPAX, significantly overestimates experimental cross sections in this mass region., accepted as Rapid Communication in PRC

Published
2016
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34. βdecay of the exoticTz=−2nucleiFe48,Ni52, andZn56

Author

B. Blank, W. Gelletly, Y. Fujita, H. C. Kozer, R. B. Cakirli, P. Ascher, J. Giovinazzo, G. Susoy, F. Molina, L. Kucuk, L. Popescu, A. Algora, B. Rubio, C. Stodel, Takatoshi Suzuki, L. Caceres, T. Kurtukian-Nieto, E. Ganioglu, S. E. A. Orrigo, A. M. Rogers, S. Grévy, O. Kamalou, J. C. Thomas, M. Gerbaux, Atsushi Tamii, B. Bilgier, and Jorge Agramunt

Subjects
Physics, 010308 nuclear & particles physics, Nuclear Theory, 0103 physical sciences, New energy, Proton emission, Atomic physics, Nuclear Experiment, 010306 general physics, 01 natural sciences, Fermi Gamma-ray Space Telescope
Abstract

The results of a study of the $\ensuremath{\beta}$ decays of three proton-rich nuclei with ${T}_{z}=\ensuremath{-}2$, namely $^{48}\mathrm{Fe},^{52}\mathrm{Ni}$, and $^{56}\mathrm{Zn}$, produced in an experiment carried out at GANIL, are reported. In all three cases we have extracted the half-lives and the total $\ensuremath{\beta}$-delayed proton emission branching ratios. We have measured the individual $\ensuremath{\beta}$-delayed protons and $\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$ rays and the branching ratios of the corresponding levels. Decay schemes have been determined for the three nuclei, and new energy levels are identified in the daughter nuclei. Competition between $\ensuremath{\beta}$-delayed protons and $\ensuremath{\gamma}$ rays is observed in the de-excitation of the $T=2$ isobaric analog states in all three cases. Absolute Fermi and Gamow-Teller transition strengths have been determined. The mass excesses of the nuclei under study have been deduced. In addition, we discuss in detail the data analysis taking as a test case $^{56}\mathrm{Zn}$, where the exotic $\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$-proton decay has been observed.

Published
2016
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35. High-precision half-life measurements of atomic nuclei

Author

J. Giovinazzo, I. Matea, B. Blank, G. Canchel, T. Kurtukian Nieto, A. Bacquias, and J. Souin

Subjects
Nuclear physics, Physics, Coupling constant, Nuclear and High Energy Physics, Series (mathematics), Atomic nucleus, Physical and Theoretical Chemistry, Atomic physics, Weak interaction, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Standard Model
Abstract

In a series of measurements performed at the IGISOL facility at the Accelerator Laboratory of the University of Jyvaskyla, the half-lives of 26Si, 29P, 30,31S, 42Ti and 62Ga were measured with high precision. These half-lives are important ingredients for tests of the weak-interaction standard model and allow, together with other experimental inputs and theoretical correction terms, the determination of the vector coupling constant of the weak interaction. The IGISOL method used in Jyvakyla is an ideal tool for these measurements as it allows to access all elements without distinction of their chemical properties.

Published
2012
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36. Isomer Spectroscopy Using Relativistic Projectile Fragmentation at the N=Z Line for A∼80→90

Author

M. Górska, Hans Geissel, Robert Hoischen, S. Pietri, Zhi Liu, W. Gelletly, H. J. Wollersheim, Stanislav Tashenov, D. L. Balabanski, E. Werner-Malento, G. Ilie, I. J. Cullen, Fernando Montes, P. Doornenball, Claes Fahlander, L. Caceres, M. E. Estevez, H. Grawe, S. Schwertel, P. H. Regan, Oliver Wieland, I. Kojouharov, T. Shizuma, A. Maj, F. Becker, M. Kmiecik, C. Brandau, Piotr Bednarczyk, S. J. Steer, Zs. Podolyák, J. Gerl, W Prokopwicz, A. Blazhev, AJ Simons, T. Kurtukian-Nieto, G. Benzoni, H. Schaffner, T. Saito, Alison Bruce, A. Kelic, Andreas Martin Heinz, B. Blank, W. N. Catford, S. Myalski, P. M. Walker, A. Jungclaus, A. B. Garnsworthy, L. Atanasova, J. Jolie, N. Kurz, Dirk Rudolph, J. Grebosz, F. Camera, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), and 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)

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon, Spectroscopy, Projectile fragmentation, ComputingMilieux_MISCELLANEOUS, Beam (structure), Line (formation)
Abstract

The preliminary results from the RISING Stopped Beam Isomer Campaign are presented, with specific focus on results of the initial experiment to investigate isomeric decays along the N=Z line around A similar to 80-90 following the projectile fragmentation of a Ag-107 primary beam at an energy of 750 MeV per nucleon. A description of the technical aspects behind the design of the RISING array is presented, together with evidence for previously unreported isomeric decays in Tc-87,Tc-88 and the N=Z nuclei Nb-82(41) and Tc-86(43).

Published
2007
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37. Super-Allowed β Decay of23Mg Studied with a High-Precision Germanium Detector

Author

M. Roche, H. Guérin, Annika Voss, T. Kurtukian Nieto, J. Giovinazzo, P. Alfaurt, Jani Hakala, C. Magron, Sami Rinta-Antila, B. Blank, Jukka Koponen, G. F. Grinyer, Ari Jokinen, Juuso Reinikainen, M. Gerbaux, H. Bouzomita, P. Delahaye, I. Matea, J. C. Thomas, Heikki Penttilä, S. Grévy, Tommi Eronen, Ilkka Pohjalainen, M. Reponen, Iain Moore, Veli Kolhinen, and Dmitry Gorelov

Subjects
Physics, nuclear mirror transitions, ta114, super-allowed decay, Analytical chemistry, quark-mixing matrix, Semiconductor detector
Published
2015
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38. Competition of β-delayed protons and β-delayed γ rays in $^{56}$Zn and the exotic β-delayed γ-proton decay

Author

H. Fujita, S. Grévy, Takatoshi Suzuki, Atsushi Tamii, B. Bilgier, B. Rubio, J. C. Thomas, G. Susoy, Y. Fujita, C. Stodel, O. Kamalou, A. Algora, J. Giovinazzo, Jorge Agramunt, S. E. A. Orrigo, W. Gelletly, A. M. Rogers, M. Gerbaux, H. C. Kozer, B. Blank, P. Ascher, R. B. Cakirli, E. Ganioglu, Lucia Popescu, L. Kucuk, F. Molina, T. Kurtukian-Nieto, L. Caceres, Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), 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), V. Greco, M. La Cognata, S. Pirrone, F. Rizzo, C. Spitaleri, 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), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, 010308 nuclear & particles physics, Proton decay, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Gamma ray, I. Heavy and Superheavy Elements, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, 0103 physical sciences, Beta (velocity), Nuclear Experiment, 010306 general physics
Abstract

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.ISBN: 978-88-7438-101-2, Expérience GANIL/LISE3/EXOGAM; International audience; Remarkable results have been published recently on the β decay of 56Zn. In particular, the rare and exotic β-delayed γ-proton emission has been detected for the first time in the fp shell. Here we focus the discussion on this exotic decay mode and on the observed competition between β-delayed protons and β-delayed γ rays from the Isobaric Analogue State.

Published
2015
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39. Exclusive measurements on at 1AGev with the SPALADIN setup at GSI

Author

S. Pietri, A. Lafriakh, A. Le Fèvre, Thomas Aumann, S. Leray, M. Fernandez-Ordoñez, F. Rejmund, Michel Combet, W. F. J. Müller, W. Trautmann, C. Schwarz, Enrique Casarejos, E. Le Gentil, C.O. Bacri, Herbert A. Simon, J. Lukasik, J.E. Ducret, C. Sfienti, A. Boudard, O. Yordanov, K. Kezzar, R. Krücken, J. Benlliure, A. Kelic, C. Volant, Håkan T Johansson, T. Kurtukian-Nieto, M. Böhmer, and Roman Gernhäuser

Subjects
Physics, Nuclear and High Energy Physics, Photon, Time projection chamber, Ion beam, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, chemistry.chemical_element, 01 natural sciences, 7. Clean energy, Nuclear physics, chemistry, Hodoscope, Dipole magnet, 0103 physical sciences, Physics::Accelerator Physics, Neutron detection, Spallation, Atomic physics, Nuclear Experiment, 010306 general physics, Instrumentation, Helium
Abstract

A new type of spallation experiments has been carried out at GSI, Darmstadt (Germany) in order to understand the spallation mechanism in greater details. These experiments use the inverse-kinematics technique where the ion beam is directed onto a liquid Hydrogen target, allowing the detection of heavy spallation residues in coincidence with low center-of-mass energy light particles. The setup is based on A Large Acceptance DIpole magNet (ALADIN) coupled with a multitrack Time Projection Chamber (TPC), a hodoscope and a neutron detector. First, data on 56 Fe + p at 1 A GeV were taken in February 2004. In the on-going analysis, isotopic cross-sections have been determined and compared to data taken at the FRagment Separator in GSI. Mean values and width of residue velocity distributions have also been obtained as well as Helium production cross-section. First, coincidence data are being analyzed.

Published
2006
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40. Half-life and branching ratios for the $\beta$ decay of $^{38}$Ca

Author

F. Munoz, I. Matea, L. Audirac, L. Caceres, B. Blank, G. Canchel, J. Giovinazzo, N. A. Smirnova, M. Gerbaux, P. Ascher, F. Didierjean, J. Souin, L. Serani, J. C. Thomas, A. Bacquias, F. de Oliveira Santos, T. Kurtukian Nieto, L. Daudin, M. Roche, S. Grévy, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), 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), 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 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), GANILEXP, 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), 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), 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 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, Branching fraction, Hadron, Half-life, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Branching (polymer chemistry), 01 natural sciences, Nuclear physics, medicine.anatomical_structure, Distribution (mathematics), 0103 physical sciences, medicine, Nuclear fusion, Nuclide, 010306 general physics, Nucleus
Abstract

In an experiment at the LISE3 facility of GANIL, we have studied with high precision the $0^{+}\rightarrow 0^{+}$ $ \beta$ decay of 38Ca. The LISE3 facility allowed to produce close to pure samples of the nuclide of interest. We measured the half-life of this nucleus to be 443.63(35)ms, whereas the super-allowed branching ratio was determined to be 77.14(35)%. Both data are in nice agreement with previous high-precision measurements and thus improve the overall precision of the experimental inputs to determine the corrected $F t$ value for this nucleus. We also compare the experimental Gamow-Teller strength distribution with theoretical shell-model predictions. Finally, future opportunities at LISE3 are discussed.

Published
2015
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41. Competition between $β$-delayed proton and $β$-delayed $γ$ decay of the exotic $T_z$ = -2 nucleus $^{56}$Zn and fragmentation of the IAS

Author

B. Bilgier, S. E. A. Orrigo, O. Kamalou, L. Kucuk, Yoshitaka Fujita, B. Blank, P. Ascher, B. Rubio, G. Susoy, S. Grévy, Atsushi Tamii, T. Suzuki, L. Popescu, J. Giovinazzo, W. Gelletly, J. Agramunt, T. Kurtukian-Nieto, H. C. Kozer, F. Molina, M. Gerbaux, A. M. Rogers, E. Ganioglu, R. B. Cakirli, J. C. Thomas, H. Fujita, C. Stodel, L. Cáceres, A. Algora, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), 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), GANILEXP, 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), 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
Isospin mixing, Nuclear Theory, proton-rich nuclei, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Isospin symmetry, Nuclear physics, symbols.namesake, Fragmentation (mass spectrometry), 56Zn, 0103 physical sciences, medicine, Matrix element, 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Charge-exchange reactions, Nuclear structure, delayed -proton decay, fragmentation of the IAS, medicine.anatomical_structure, symbols, Atomic physics, Gamow-Teller transitions, Hamiltonian (quantum mechanics), Nucleus, Excitation, Fermi Gamma-ray Space Telescope
Abstract

Proceedings of the 2nd Conference on Advances in Radioactive Isotope Science ARIS2014. 6 pages, 4 figures; International audience; A very exotic decay mode at the proton drip-line, $\beta$-delayed $\gamma$-proton decay, has been observed in the $\beta$ decay of the $T_z$ = -2 nucleus $^{56}$Zn. Three $\gamma$-proton sequences have been observed following the $\beta$ decay. The fragmentation of the IAS in $^{56}$Cu has also been observed for the first time. The results were reported in a recent publication. At the time of publication the authors were puzzled by the competition between proton and $\gamma$ decays from the main component of the IAS. Here we outline a possible explanation based on the nuclear structure properties of the three nuclei involved, namely $^{56}$Zn, $^{56}$Cu and $^{55}$Ni, close to the doubly magic nucleus $^{56}$Ni. From the fragmentation of the Fermi strength and the excitation energy of the two populated 0$^{+}$ states we could deduce the off-diagonal matrix element of the charge-dependent part of the Hamiltonian responsible for the mixing. These results are compared with the decay of $^{55}$Cu with one proton less than $^{56}$Zn. For completeness we summarise the results already published.

Published
2015
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42. β decay studies of n-rich Cs isotopes with the ISOLDE Decay Station

Author

S. Ceruti, J.-M. Régis, A. I. Morales, H. De Witte, T. Kröll, A. Negret, A Orduz, J. Creswell, Ulli Köster, Joonas Konki, V. Charviakova, N. Blasi, M. V. Lund, F. Rotaru, I.H. Lazarus, M. Stanoiu, G. Fernández-Martínez, J. Kurcewicz, S. Leoni, H. O. U. Fynbo, N. Marginean, Panu Rahkila, F. C. L. Crespi, Olof Tengblad, V. Karayonchev, C. Sotty, Paul Greenlees, R. Lica, V. Vedia, S. Pascu, N. Cieplicka-Oryńczak, Marc Huyse, Henryk Mach, R. Mărginean, R. E. Mihai, M Thuerauf, C. Mihai, J. Jolie, María José García Borge, A. Bracco, L. M. Fraile, J. Benito, N Saed-Sami, F. Camera, T. Kurtukian-Nieto, Miguel Madurga, P. Van Duppen, G. Benzoni, C. Costache, V. F. E. Pucknell, N. Warr, T Berry, V. Sánchez-Tembleque, Z. Patyk, A. Turturica, I. Homm, Ministerio de Economía y Competitividad (España), Belgian Science Policy Office, Federal Ministry of Education and Research (Germany), SCOAP, National Science Centre (Poland), Istituto Nazionale di Fisica Nucleare, European Commission, Institut Laue-Langevin (ILL), ILL, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), and 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)

Subjects
Nuclear and High Energy Physics, NEUTRON-RICH, nuclear deformation, Isotopes of germanium, β decay, MASS, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, ISOLDE, BA-148, Nuclear physics, LA-148, 0103 physical sciences, Nuclear Physics - Experiment, BAND-STRUCTURES, Nuclear Experiment, 010306 general physics, Physics, Decay scheme, NUCLEI, Isotope, 010308 nuclear & particles physics, BEAMS, Beta decay, 3. Good health, exotic nuclei, PICOSECOND LIFETIME MEASUREMENTS, beta decay, Atomic physics, Nuclear deformation, ISOLDE, Exotic nuclei
Abstract

R. Lica et al. -- 14 pags., 7 figs., tab. -- Open Access funded by Creative Commons Atribution Licence 3.0, Neutron-rich Ba isotopes are expected to exhibit octupolar correlations, reaching their maximum in isotopes around mass A = 146. The odd-A neutron-rich members of this isotopic chain show typical patterns related to non-axially symmetric shapes, which are however less marked compared to even-A ones, pointing to a major contribution from vibrations. In the present paper we present results from a recent study focused on Cs β-decay performed at the ISOLDE Decay Station equipped with fast-timing detectors. A detailed analysis of the measured decay half-lives and decay scheme of Ba is presented, giving a first insight in the structure of this neutron-rich nucleus., The IDS collaboration acknowledges financial support from: Istituto Nazionale di Fisica Nucleare, the Italian ‘Programmi di Ricerca Scientifica di Rilevante Interesse Nazionale (PRIN)’ contract number 2001024324 01302, the European Union’s seventh framework through ENSAR, contract no. 262010, the European Unions Horizon 2020 Framework research and innovation programme under grant agreement no. 654002 (ENSAR2), the FATIMA-NuPNET network via the PRI-PIMNUP-2011-1338 project, the Spanish MINECO projects reference numbers FPA2013-41467-P and FPA2015-646969-P, the German BMBF under contract 05P15PKCIA and ‘Verbundprojekt 05P2015’, the FWO-Vlaanderen (Belgium) and the IAP Belgian Science Policy (BriX network P7/12). VCh and ZP acknowledge support by the polish grant of Narodowe Centrum Nauki nr 2015/18/M/ST2/00523.

Published
2017
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43. Beta-decay half-lives of new neutron-rich isotopes of Re, Os and Ir approaching the r-process path near N = 126

Author

F. Becker, Enrique Casarejos, B. Jurado, F. Farget, O. Yordanov, Karlheinz Langanke, K.-H. Schmidt, B. Blank, Daniela Henzlova, L. Audouin, J. Benlliure, J. Giovinazzo, Gabriel Martínez-Pinedo, M. Fernandez-Ordoñez, Ivan Borzov, J. Pereira, T. Kurtukian-Nieto, 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), Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université 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), 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), Aval du cycle et Energie Nucléaire (ACEN), 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 Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université 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), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Beta decay, Nuclear physics, Fragmentation (mass spectrometry), r-process, Nuclear fusion, Neutron, Nuclide, Atomic physics
Abstract

Expérience à GSI/FRS; Heavy neutron-rich nuclei close to N = 126 were produced by fragmentation of a 1A GeV 208Pb beam at the FRS at GSI. The β-decay half-lives of 7 nuclides have been determined using a novel numerical analysis method. The half-lives of 202,199Ir, 200,199Os and 196Re are reported for the first time. The comparison of the data with model calculations provides indications on the importance of first-forbidden transitions on the β-decay of nuclei around N = 126 and Z < 82.

Published
2014
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44. $\beta $-delayed $\gamma $-proton Decay in $^{56}$Zn: Analysis of the Charged-particle Spectrum

Author

H. C. Kozer, Lucia Popescu, Toshio Suzuki, L. Caceres, L. Kucuk, J. C. Thomas, R. B. Cakirli, P. Ascher, A. M. Rogers, Ch. Stodel, J. Agramunt, Berta Rubio, Yoshitaka Fujita, F. Molina, G. Susoy, S. E. A. Orrigo, M. Gerbaux, J. Giovinazzo, Alejandro Algora, O. Kamalou, H. Fujita, T. Kurtukian-Nieto, E. Ganioglu, B. Blank, Atsushi Tamii, B. Bilgier, S. Grévy, W. Gelletly, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), 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), GANILEXP, 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), 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, 010308 nuclear & particles physics, Proton decay, Spectrum (functional analysis), Nuclear Theory, General Physics and Astronomy, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, 23.40.–s, 23.50.+z, 21.10.–k, 27.40.+z, Nuclear physics, medicine.anatomical_structure, Beta (plasma physics), 0103 physical sciences, medicine, High Energy Physics::Experiment, Física nuclear, Nuclear Experiment (nucl-ex), Nuclear Experiment, Nucleus
Abstract

A study of the $\beta$ decay of the proton-rich $T_{z}$ = -2 nucleus $^{56}$Zn has been reported in a recent publication. A rare and exotic decay mode, $\beta$-delayed $\gamma$-proton decay, has been observed there for the first time in the $fp$ shell. Here we expand on some of the details of the data analysis, focussing on the charged particle spectrum., Comment: Proceedings of the Zakopane Conference on Nuclear Physics 2014 "Extremes of the Nuclear Landscape". 4 pages, 4 figures

Published
2014
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45. Half-Life Systematics across theN=126Shell Closure: Role of First-Forbidden Transitions in theβDecay of Heavy Neutron-Rich Nuclei

Author

K.-H. Schmidt, C. Mihai, Robert Hoischen, A. M. Denis Bacelar, S. J. Steer, J. J. Valiente-Dobón, D. Mücher, Yoshitaka Fujita, S. Verma, B. Rubio, M. E. Estévez-Aguado, Atsushi Tamii, A. I. Morales, N. Kurz, L. Caceres, P. Doornenbal, R Kumar, P. J. Woods, Stanislav Tashenov, S. Pietri, J. Benlliure, Alison Bruce, Enrique Casarejos, I. Kojouharov, G. F. Farrelly, H. Shaffner, Zs. Podolyák, J. Gerl, A. B. Garnsworthy, M. Górska, N. Alkhomashi, T. Kurtukian-Nieto, Philip M Walker, J. Grebosz, A. Blazhev, Zhongfan Liu, F. Molina, W. Gelletly, H. J. Wollersheim, P. Boutachkov, Alejandro Algora, I. J. Cullen, H. Alvarez-Pol, S. Lalkovski, P. H. Regan, N. Al-Dahan, and G. Benzoni

Subjects
Physics, Isotope, Isotone, Nuclear Theory, General Physics and Astronomy, Beta decay, Nuclear physics, Nucleosynthesis, Double beta decay, r-process, Neutron, Atomic physics, Nuclear Experiment, Spectroscopy
Abstract

This Letter reports on a systematic study of β-decay half-lives of neutron-rich nuclei around doubly magic Pb208. The lifetimes of the 126-neutron shell isotone Pt204 and the neighboring Ir200-202, Pt203, Au204 are presented together with other 19 half-lives measured during the "stopped beam" campaign of the rare isotope investigations at GSI collaboration. The results constrain the main nuclear theories used in calculations of r-process nucleosynthesis. Predictions based on a statistical macroscopic description of the first-forbidden β strength reveal significant deviations for most of the nuclei with N

Published
2014
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46. Observation of theβ-Delayedγ-Proton Decay ofZn56and its Impact on the Gamow-Teller Strength Evaluation

Author

B. Bilgier, E. Ganioǧlu, S. Grévy, J. Giovinazzo, B. Rubio, P. Ascher, A. M. Rogers, J. C. Thomas, W. Gelletly, Atsushi Tamii, Hisanori Fujita, H. C. Kozer, Lucia Popescu, Y. Fujita, L. Kucuk, F. Molina, B. Blank, M. Gerbaux, T. Kurtukian-Nieto, S. E.A. Orrigo, O. Kamalou, C. Stodel, Takashi Suzuki, Alejandro Algora, J. Agramunt, L. Caceres, G. Susoy, and R. B. Cakirli

Subjects
Nuclear physics, Physics, Proton decay, Isospin, Double beta decay, Nuclear Theory, General Physics and Astronomy, High Energy Physics::Experiment, Nuclear Experiment, Nuclear theory, Beta decay, Fermi Gamma-ray Space Telescope
Abstract

We report the observation of a very exotic decay mode at the proton drip line, the $\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$-proton decay, clearly seen in the $\ensuremath{\beta}$ decay of the ${T}_{z}=\ensuremath{-}2$ nucleus $^{56}\mathrm{Zn}$. Three $\ensuremath{\gamma}$-proton sequences have been observed after the $\ensuremath{\beta}$ decay. Here this decay mode, already observed in the $sd$ shell, is seen for the first time in the $fp$ shell. Both $\ensuremath{\gamma}$ and proton decays have been taken into account in the estimation of the Fermi and Gamow-Teller strengths. Evidence for fragmentation of the Fermi strength due to strong isospin mixing is found.

Published
2014
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47. Observation of the β-delayed γ-proton decay of (56)Zn and its impact on the Gamow-Teller strength evaluation

Author

S E A, Orrigo, B, Rubio, Y, Fujita, B, Blank, W, Gelletly, J, Agramunt, A, Algora, P, Ascher, B, Bilgier, L, Cáceres, R B, Cakirli, H, Fujita, E, Ganioğlu, M, Gerbaux, J, Giovinazzo, S, Grévy, O, Kamalou, H C, Kozer, L, Kucuk, T, Kurtukian-Nieto, F, Molina, L, Popescu, A M, Rogers, G, Susoy, C, Stodel, T, Suzuki, A, Tamii, and J C, Thomas

Abstract

We report the observation of a very exotic decay mode at the proton drip line, the β-delayed γ-proton decay, clearly seen in the β decay of the T_{z}=-2 nucleus ^{56}Zn. Three γ-proton sequences have been observed after the β decay. Here this decay mode, already observed in the sd shell, is seen for the first time in the fp shell. Both γ and proton decays have been taken into account in the estimation of the Fermi and Gamow-Teller strengths. Evidence for fragmentation of the Fermi strength due to strong isospin mixing is found.

Published
2014

48. Production cross sections of heavy neutron-rich nuclei approaching the nucleosynthesis r-process path around A = 195

Author

F. Becker, J. Pereira, M. Fernandez-Ordoñez, K.-H. Schmidt, B. Blank, T. Kurtukian-Nieto, Enrique Casarejos, Daniela Henzlova, J. Giovinazzo, L. Audouin, F. Farget, O. Yordanov, J. Benlliure, B. Jurado, 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), Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université 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), 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), Aval du cycle et Energie Nucléaire (ACEN), 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 Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université 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), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, 26.30.Hj, 25.70.Mn, 27.80.+w, Nucleosynthesis, Path (graph theory), r-process, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2014
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49. Beta decay of the exotic Tz = - 2, $^{56}$Zn nucleus and half-life of various proton-rich Tz = -1 nuclei

Author

B. Rubio, E. Ganioglu, W. Gelletly, H. C. Kozer, Lucia Popescu, F. Molina, L. Kucuk, T. Kurtukian-Nieto, B. Blank, A. M. Rogers, J. C. Thomas, S. E.A. Orrigo, Takashi Suzuki, G. Susoy, O. Kamalou, J. Giovinazzo, M. Gerbaux, Y. Fujita, Alejandro Algora, Hisanori Fujita, Atsushi Tamii, B. Bilgier, S. Grévy, P. Ascher, C. Stodel, R. B. Cakirli, J. Agramunt, L. Caceres, Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université 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), Department of Physics, University of Surrey, University of Surrey (UNIS), 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), Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan, SKC CEN, Belgique, Physics Division, Argonne National Laboratory, Argonne National Laboratory [Lemont] (ANL), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université 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), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear physics, 23.40.-s, 23.50.+z, 21.10.-k, 27.40.+z, medicine.anatomical_structure, Proton, medicine, General Physics and Astronomy, Half-life, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Beta decay, Nucleus
Abstract

Expérience GANIL/LISE3/EXOGAM; International audience; Preliminary results of an experimental study of the beta -decay of the exotic T$_z$ = - 2, $^{56}$Zn nucleus and other proton-rich T$_z$ = -1 nuclei are presented. The ions were produced at GANIL using fragmentation reactions, separated by the LISE3 spectrometer and implanted in a double-sided silicon strip detector surrounded by Ge detectors. The half-lives of $^{56}$Zn and four T$_z$ = -1 nuclei in the fp-shell have been measured. While the decay of the T$_z$ = -1 nuclei proceeds essentially by -delayed gamma emission, in the case of $^{56}$Zn -delayed proton emission is also observed. Moreover, the exotic -delayed gamma-proton decay is seen for the first time. The information from the decay study has been used to determine the absolute Fermi and Gamow-Teller transition strengths. The results for $^{56}$Zn have been compared with the mirror Charge Exchange process, the ($^3$He,t) reaction on the T$_z$ = +2, $^{56}$Fe target nucleus. This comparison is important for understanding the $^{56}$Zn decay data.

Published
2014
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50. SPIRAL2/DESIR high resolution mass separator

Author

T. Kurtukian-Nieto, T. Chiron, A. Fournier, Francois Méot, Richard Baartman, L. Serani, F. Varenne, B. Blank, H. Weick, M. Duval, C. N. Davids, M.-H. Stodel, F. Delalee, S. El Abbeir, D. Lunney, Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université 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), Neutrino et Faibles Radioactivités (NEMO), MECA, Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université 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)-Institut Armand Frappier (INRS-IAF), Institut National de la Recherche Scientifique [Québec] (INRS)-Réseau International des Instituts Pasteur (RIIP)-Institut National de la Recherche Scientifique [Québec] (INRS)-Réseau International des Instituts Pasteur (RIIP), CSNSM SNO, 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), 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), INSTRU, 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), SPIRAL2, Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Institut Armand Frappier (INRS-IAF), 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), 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)-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)

Subjects
Nuclear and High Energy Physics, High-resolution isobar separator, 010308 nuclear & particles physics, Chemistry, Particle beam transport, High resolution, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Symmetric configuration, Nuclear physics, 0103 physical sciences, Physics::Accelerator Physics, Charged-particle spectrometers, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Beam emittance, 010306 general physics, Multipole expansion, Instrumentation, Magnetic dipole, Separator (electricity)
Abstract

DESIR is the low-energy part of the SPIRAL2 ISOL facility under construction at GANIL. DESIR includes a high-resolution mass separator (HRS) with a designed resolving power m / Δ m of 31,000 for a 1 π-mm-mrad beam emittance, obtained using a high-intensity beam cooling device. The proposed design consists of two 90-degree magnetic dipoles, complemented by electrostatic quadrupoles, sextupoles, and a multipole, arranged in a symmetric configuration to minimize aberrations. A detailed description of the design and results of extensive simulations are given.

Published
2013
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