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51. g-factors of isomers around N≈40, Z≈28 from time-dependent Larmor precession on spin-aligned projectile-like fragments

Author

C. Borcea, Yu. E. Penionzkevich, Robert Grzywacz, Stéphanie Teughels, M. Pfützner, M. Lewitowicz, K. P. Rykaczewski, M. Sawicka, G. Georgiev, Yu. Sobolev, I. Macovei, Zsolt Podolyak, Katrien Vyvey, G. Goldring, R. D. Page, Romain Coussement, Henryk Mach, C. R. Bingham, N. A. Smirnova, C.D. O'Leary, F. de Oliveira Santos, Nico Coulier, D. L. Balabanski, J. M. Daugas, M. Górska, Gerda Neyens, H. Grawe, P. H. Regan, G. Defrance, and Michael Hass

Subjects
Physics, Larmor precession, Nuclear and High Energy Physics, Future studies, Fragmentation (mass spectrometry), Projectile, Time windows, Gyromagnetic ratio, Nuclear structure, Atomic physics, Ion
Abstract

First and preliminary results of an experiment aimed at measuring g -factors of isomeric states in neutron-rich nuclei in the vicinity of 68 Ni are reported. Isomers near the predicted N =40 sub-shell closure in 69 Cu, 67 Ni and 66 Co have been populated in the fragmentation of a 76 Ge, 61.4 MeV/u beam onto a 145 mg/cm 2 9 Be target at GANIL. Here we report the results for the 357(2) ns, I π =13/2 + isomer in 69 Cu for which a preliminary gyromagnetic ratio of | g |=0.195(9) was derived. The Larmor precession of the spin-oriented isomeric ensemble was measured by recording γ –ion correlations in a 20 μs time window. This pioneering experiment has indicated interesting nuclear structure information and shows promising possibilities for future studies of this kind.

Published
2002
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52. Yrast 6+Seniority Isomers of136,138Sn

Author

Hiroyoshi Sakurai, Shunji Nishimura, D. Mücher, Atsuko Odahara, Naohiro Inabe, Toshiyuki Sumikama, Zs. Vajta, J. M. Daugas, H. Naïdja, Hiroyuki Takeda, T. Kröll, I. Kojouharov, G. D. Kim, Giuseppe Lorusso, K. Steiger, F. Drouet, Pieter Doornenbal, Zhengyu Xu, Young-Ki Kim, R. Orlandi, Y. Shimizu, Younghun Kwon, Ayumi Yagi, Toshiyuki Kubo, A. Montaner-Pizá, Anna Wendt, K. Yoshinaga, Jin Wu, F. Browne, G. S. Simpson, Jan Taprogge, D. Kameda, H. Baba, K. Moschner, Tadaaki Isobe, Hiroki Nishibata, S. Ilieva, Guillaume Gey, H. Schaffner, Z. H. Li, A. Jungclaus, N. Kurz, Pär-Anders Söderström, Hyo Soon Jung, Naoki Fukuda, Hiroshi Suzuki, Roman Gernhäuser, S. Bönig, Hiroshi Watanabe, F. Nowacki, and Kamila Sieja

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Fission, Yrast, Nuclear Theory, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Nuclear physics, Matrix (mathematics), Seniority (financial), Excited state, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract

Delayed γ-ray cascades, originating from the decay of (6⁺) isomeric states, in the very neutron-rich, semimagic isotopes (136,138)Sn have been observed following the projectile fission of a ²³⁸U beam at RIBF, RIKEN. The wave functions of these isomeric states are proposed to be predominantly a fully aligned pair of f(7/2) neutrons. Shell-model calculations, performed using a realistic effective interaction, reproduce well the energies of the excited states of these nuclei and the measured transition rates, with the exception of the B(E2;6⁺→4⁺) rate of ¹³⁶Sn, which deviates from a simple seniority scheme. Empirically reducing the νf(7/2)(2) orbit matrix elements produces a 4₁⁺ state with almost equal seniority 2 and 4 components, correctly reproducing the experimental B(E2;6⁺→4⁺) rate of ¹³⁶Sn. These data provide a key benchmark for shell-model interactions far from stability.

Published
2014
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53. Erratum:1p3/2Proton-Hole State inSn132and the Shell Structure AlongN=82[Phys. Rev. Lett. 112, 132501 (2014)]

Author

H. Baba, Zhengyu Xu, Young-Ki Kim, J. M. Daugas, A. Jungclaus, G. J. Lane, Giuseppe Lorusso, Z. H. Li, D. Kameda, H. Schaffner, Younghun Kwon, A. Montaner-Pizá, T. Kröll, K. Y. Chae, Shunji Nishimura, Atsuko Odahara, Hiroyoshi Sakurai, Jinguang Wu, F. G. Kondev, Hiroshi Suzuki, I. Kojouharov, P. Doornenbal, Toshiyuki Kubo, T. Isobe, H. Grawe, N. Kurz, Ayumi Yagi, Naohito Inabe, S. Bönig, Hiroshi Watanabe, F. Drouet, F. Naqvi, G. D. Kim, Naoki Fukuda, Zs. Podolyák, Megumi Niikura, Hiroki Nishibata, K. Steiger, L. Coraggio, K. Moschner, G. Benzoni, Toshiyuki Sumikama, Hiroyuki Takeda, F. Browne, A. Gadea, Guillaume Gey, P. A. Söderström, Anna Wendt, S. Ilieva, Jan Taprogge, Roman Gernhäuser, Hyo Soon Jung, D. Mücher, R. Orlandi, A. Covello, Gary Simpson, K. Yoshinaga, Z. Patel, A. Gargano, and Zs. Vajta

Subjects
Physics, Proton, Double beta decay, SHELL model, General Physics and Astronomy, State (functional analysis), Atomic physics, Beta decay
Published
2014
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54. Probing nuclear forces beyond the drip-line using the mirror nuclei N16 and F16

Author

M. Lenhardt, Thomas Davinson, Vincent Tatischeff, I. Stefan, S. Grévy, F. de Grancey, J. C. Thomas, Marek Ploszajczak, J. Mrazek, M. Stanoiu, R. Borcea, C. Stodel, J. C. Angelique, M. G. Pellegriti, M. G. Saint Laurent, I. Ray, O. Roig, M. Lewitowicz, F. de Oliveira Santos, J. M. Daugas, M. Fadil, G. Dumitru, M. Angélique, Jürgen Kiener, A. Lefebvre-Schuhl, C. Borcea, A. Buta, D. Pantelica, F. Negoita, L. Perrot, E. Berthoumieux, and O. Sorlin

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Nuclear Theory, Nuclear force, Neutron, Symmetry breaking, Mirror nuclei, Atomic physics, Nuclear Experiment
Abstract

Radioactive beams of $^{14}\mathrm{O}$ and $^{15}\mathrm{O}$ were used to populate the resonant states ${1/2}^{+}$, ${5/2}^{+}$ and ${0}^{\ensuremath{-}},{1}^{\ensuremath{-}},{2}^{\ensuremath{-}}$ in the unbound $^{15}\mathrm{F}$ and $^{16}\mathrm{F}$ nuclei, respectively, by means of proton elastic scattering reactions in inverse kinematics. Based on their large proton spectroscopic factor values, the resonant states in $^{16}\mathrm{F}$ can be viewed as a core of $^{14}\mathrm{O}$ plus a proton in the $2{s}_{1/2}$ or $1{d}_{5/2}$ shell and a neutron in $1{p}_{1/2}$. Experimental energies were used to derive the strength of the $2{s}_{1/2}$-$1{p}_{1/2}$ and $1{d}_{5/2}$-$1{p}_{1/2}$ proton-neutron interactions. It is found that the former changes by 40% compared with the mirror nucleus $^{16}\mathrm{N}$, and the latter changes by 10%. This apparent symmetry breaking of the nuclear force between mirror nuclei finds explanation in the role of the large coupling to the continuum for the states built on an $\ensuremath{\ell}=0$ proton configuration.

Published
2014
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55. 1p3/2Proton-Hole State inSn132and the Shell Structure AlongN=82

Author

T. Kröll, I. Kojouharov, Shunji Nishimura, Zs. Vajta, F. G. Kondev, Naohiro Inabe, F. Drouet, Jan Taprogge, H. Schaffner, Roman Gernhäuser, Pär-Anders Söderström, D. Mücher, Atsuko Odahara, A. Gadea, H. Baba, Toshiyuki Sumikama, L. Coraggio, Megumi Niikura, Pieter Doornenbal, Tadaaki Isobe, Ayumi Yagi, K. Y. Chae, Gary Simpson, F. Naqvi, Z. H. Li, A. Jungclaus, S. Bönig, Hiroyoshi Sakurai, Toshiyuki Kubo, A. Covello, G. D. Kim, Hiroyuki Takeda, Hiroshi Watanabe, Hiroshi Suzuki, Hiroki Nishibata, J. M. Daugas, Young-Ki Kim, K. Yoshinaga, K. Moschner, G. J. Lane, Giuseppe Lorusso, Younghun Kwon, D. Kameda, A. Montaner-Pizá, H. Grawe, Zena Patel, Hyo Soon Jung, N. Kurz, Jin Wu, A. Gargano, Zhengyu Xu, F. Browne, G. Benzoni, K. Steiger, Zs. Podolyák, Guillaume Gey, Anna Wendt, N. Fukuda, S. Ilieva, and R. Orlandi

Subjects
Physics, Nuclear physics, Proton, Double beta decay, SHELL model, General Physics and Astronomy, State (functional analysis), Engineering physics, Beta decay
Abstract

5 pags. ; 3 figs. ; PACS numbers: 23.40.-s, 21.10.Pc, 27.60.+j, 21.60.Cs ; Taprogge, J., et al.

Published
2014
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56. In-flight fast-timing measurements inSm152

Author

Aurelien Blanc, F. Hannachi, M. Versteegen, M. Zielinska, J. Goupil, N. Arnal, C. Spitaels, C. Plaisir, M. Tarisien, V. Méot, L. Gaudefroy, M. Rejmund, O. Roig, G. Frémont, T. Bonnet, C. Schmitt, J. M. Daugas, J. Pancin, F. Gobet, A. Navin, and T. Roger

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Nuclear structure, Order (ring theory), State (functional analysis), Nanosecond, 01 natural sciences, Measure (mathematics), Picosecond, 0103 physical sciences, Quadrupole, Atomic physics, 010306 general physics
Abstract

We report on the first application of in-flight fast-timing measurements, a method developed in order to directly measure lifetimes in the picosecond to nanosecond range. As a proof of principle of the method, lifetimes of the states belonging to the ground-state band in $^{152}\mathrm{Sm}$ are measured up to the 8${}_{1}^{+}$ state. An excellent agreement with recommended values is found. A slightly improved determination of the spectroscopic quadrupole moment of the 4${}_{1}^{+}$ state is also reported. In-flight fast-timing measurements open interesting opportunities for future studies of collective properties in radioactive nuclei.

Published
2014
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58. Measurement of the g factors of isomers near the proposed N ≈ 40 subshell closure

Author

M. Hass, N. A. Smirnova, G. Goldring, Romain Coussement, Yu. G. Sobolev, G. Georgiev, M. Sawicka, R. D. Page, G. Defrance, Nico Coulier, M. Lewitowicz, Henryk Mach, M. Stanoiu, D. L. Balabanski, C. R. Bingham, Stéphanie Teughels, P. H. Regan, Zs. Podolyák, I. Macovei, C. Borcea, M. Górska, C.D. O'Leary, H. Grawe, Gerda Neyens, J. M. Daugas, M. Pfützner, Robert Grzywacz, Yu. E. Penionzkevich, F. de Oliveira Santos, K. P. Rykaczewski, and Katrien Vyvey

Subjects
Physics, Nuclear and High Energy Physics, Angular distribution, Isotope, g factor, Closure (topology), Atomic physics, Nuclear Experiment, Measure (mathematics), Projectile fragmentation, Atomic and Molecular Physics, and Optics
Abstract

We report results from a pioneering experiment to measure the g factors of isomeric states of neutron-rich nuclei around 68Ni, far from the valley of β stability.For the first time, the time-dependent perturbed angular distribution method was applied in combination with the heavy-ion-γ correlation technique to study g factors of spin-aligned isomers produced in a projectile fragmentation reaction and mass-separated. Some technical aspects are discussed and illustrated with preliminary results.

Published
2001
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59. In-beam γ-spectroscopy using projectile fragmentation: Structure of neutron-rich nuclei around N=20

Author

F. De Oliveira-Santos, O. Sorlin, J. M. Daugas, N. L. Achouri, M. J. Lopez-Jimenez, M. Stanoiu, C. Borcea, M. Lewitowicz, F. Azaiez, C. Donzaud, Josette Duprat, D. Guillemaud-Mueller, S. Leenhardt, M. G. Saint-Laurent, M. Belleguic, S. Grévy, Ch. Bourgeois, Yu. Sobolev, J. C. Angélique, and Yu. E. Penionzhkevich

Subjects
Physics, Nuclear and High Energy Physics, Neutron, Atomic physics, Spectroscopy, Projectile fragmentation, Beam (structure)
Published
2001
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60. Erratum to 'Beta decay half-lives of neutron rich Ti–Co isotopes around N=40' [Nucl. Phys. A 660 (1999) 3–19]

Author

F. de Oliveira Santos, C. Borcea, F. Pougheon, Karl Kratz, M. G. Saint-Laurent, L. Petizon, Eric Chabanat, O. Sorlin, C. Longour, R. Béraud, A. Emsallem, G. Canchel, M. J. Lopez, Leif Axelsson, M. Lewitowicz, M. Belleguic, J. E. Sauvestre, J. M. Daugas, C. Donzaud, S. Leenhardt, M. Girod, B. Pfeiffer, D. Guillemaud-Mueller, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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 Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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 reaction, Physics, Nuclear and High Energy Physics, Isotopes of chromium, 010308 nuclear & particles physics, Context (language use), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Beta decay, Isotopes of vanadium, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Isotopes of cobalt, Radioactive decay
Abstract

The neutron-rich 57−59 Ti, 59−62 V, 61−64 Cr, 63−66 Mn, 65−68 Fe, 67−70 Co have been produced at GANIL via interactions of a 60.4 MeV/u 86 Kr 34+ with a 58 Ni target. They have been separated by the doubly achromatic spectrometer LISE3. Beta-decay half-lives have been determined for all produced nuclei, and subsequent γ -rays have been observed for the most efficiently produced nuclei. The measured half-lives of vanadium and chromium isotopes are compared to QRPA calculations using ground states deformations from the FRDM or ETFSI models. In an astrophysical context, the short half-lives of 58 Ti and 64 Cr indicate that these nuclei are potential r-process progenitors, after β -decay, of 58 Fe and 64 Ni in certain inclusions of meteorites.

Published
2000
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61. Beta decay half-lives of neutron rich Ti–Co isotopes around

Author

O. Sorlin, Leif Axelsson, G. Canchel, C. Donzaud, J. M. Daugas, M. Lewitowicz, D. Guillemaud-Mueller, J. E. Sauvestre, M. G. Saint-Laurent, Eric Chabanat, A. Emsallem, C. Longour, R. Béraud, Karl Kratz, C. Borcea, L. Petizon, B. Pfeiffer, M. J. Lopez, S. Leenhardt, M. Belleguic, F. Pougheon, and F. de Oliveira Santos

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotopes of chromium, Isotope, Isotopes of vanadium, Analytical chemistry, Neutron, Context (language use), Atomic physics, Beta decay, Radioactive decay
Abstract

The neutron-rich 57 – 59 Ti, 59 – 62 V, 61 – 64 Cr, 63 – 66 Mn, 65 – 68 Fe, 67 – 70 Co have been produced at GANIL via interactions of a 60.4 MeV/u 86 Kr 34+ with a 58 Ni target. They have been separated by the doubly achromatic spectrometer LISE3. Beta-decay half-lives have been determined for all produced nuclei, and subsequent γ -rays have been observed for the most efficiently produced nuclei. The measured half-lives of vanadium and chromium isotopes are compared to QRPA calculations using ground states deformations from the FRDM or ETFSI models. In an astrophysical context, the short half-lives of 58 Ti and 64 Cr indicate that these nuclei are potential r-process progenitors, after β -decay, of 58 Fe and 64 Ni in certain inclusions of meteorites.

Published
1999
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62. Study of μs-isomers in neutron-rich nuclei around Z=28 and N=40 shell closures

Author

K. L. Jones, A. Nowak, Robert Grzywacz, W. Trinder, W. N. Catford, S. Viteritti, M. Houry, M. Glogowski, M. Sawicka, M. G. Saint-Laurent, J. C. Angélique, G. Sletten, J. Szerypo, R. Bentida, L. Achouri, A.C. Mueller, A. Płochocki, O. Sorlin, J. M. Daugas, C. Borcea, M. Stanoiu, D. Baiborodin, J. S. Winfield, M. Pfützner, K. Rykaczewski, A. Emsallem, M. Schaefer, R.C. Lemmon, P. H. Regan, D. Guillemaud-Mueller, R. Béraud, S. Hurskanen, J. E. Sauvestre, H. Grawe, F. De Oliveira-Santos, C. R. Bingham, M. Lewitowicz, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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 physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Shell (structure), Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences
Abstract

NESTER

Published
1999
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63. β-decay of 35Ca

Author

Robert Grzywacz, W. Trinder, C. Borcea, Teemu Siiskonen, D. Guillemaud-Mueller, S. Grévy, M. Lewitowicz, A.N Ostrowski, J. C. Angelique, J. M. Daugas, M. J. Lopez, F. de Oliveira, Juha Äystö, Ari Jokinen, R. Anne, and M. G. Saint-Laurent

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, Spectrometer, 010308 nuclear & particles physics, 01 natural sciences, 7. Clean energy, medicine.anatomical_structure, Transition strength, Excited state, 0103 physical sciences, medicine, Proton emission, Atomic physics, 010306 general physics, Nucleus
Abstract

The β-decay of the T z =− 5 2 nucleus 35 Ca was studied at the LISE3 spectrometer at GANIL. The 35 Ca decay scheme was deduced from its β-delayed proton emission into the ground and excited states of 34 Ar and from its β-delayed two-proton emission. The 35 Ca half-life was determined to be 25.7±0.2 ms. The measured transition strength function B(GT) is compared to results obtained from large-scale sd-shell model calculations.

Published
1999
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64. New isotopes and isomers produced by the fragmentation of U at 1000 MeV/nucleon

Author

M. Górska, F. de Oliviera, Thomas Baumann, S. Leenhardt, D. Cortina-Gil, P. Armbruster, P. H. Regan, H. Grawe, J. Benlliure, M. Rejmund, M. Karny, M. Bernas, W. N. Catford, Robert Grzywacz, Arnd R. Junghans, K. Sümmerer, A.C. Mueller, Margareta Hellström, J. M. Daugas, Hans Geissel, Naohito Iwasa, K. P. Rykaczewski, M. Lewitowicz, M. Pfützner, and Z. Janas

Subjects
Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, chemistry.chemical_element, 01 natural sciences, 7. Clean energy, Nuclear physics, chemistry, Fragmentation (mass spectrometry), 0103 physical sciences, Beryllium, 010306 general physics, Nucleon
Abstract

Seven previously unobserved neutron-rich isotopes ( 209 Hg, 210 Hg, 211 Tl, 212 Tl, 218 Bi, 219 Po and 220 Po) have been identified among the fragmentation products of a 1000 MeV/nucleon 238 U beam incident on a beryllium target. The γ -ray decays of 9 known and 4 new μ s-isomers in nuclei around 208 Pb were also observed. Production cross sections and probabilities for populating isomeric states in the fragmentation reaction were determined and compared with a simple model based on the statistical abrasion-ablation approach.

Published
1998
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65. Observation of Fermi Superallowedβ+Decays in Heavy Odd-Odd,N=ZNuclei: Evidence for0+Ground States inY78,N82b, andT86c

Author

Ph. Dessagne, L. Frankland, J. Giovinazzo, Robert Grzywacz, Leif Axelsson, R. M. Clark, C. Longour, A. Fleury, B. Blank, W. Gelletly, P. H. Regan, M. Lewitowicz, C. J. Pearson, D. M. Cullen, R. Wadsworth, W. N. Catford, J. M. Daugas, K. L. Jones, O. Sorlin, D. Applebe, Ch. Miehé, B. J. Greenhalgh, J. Garcés Narro, C. Chandler, R. D. Page, Marie K. Harder, A.T. Reed, Alison Bruce, S. Czajkowski, N. S. Kelsall, and T. Kszczot

Subjects
Physics, Nuclear physics, Particle physics, General Physics and Astronomy, Beta (velocity), Fermi Gamma-ray Space Telescope
Published
1998
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66. Study of subshell closure atN = 40 by Coulomb excitation

Author

M. Lewitowicz, F. de Oliveira, A. Gillibert, C. Bourgeois, J. M. Daugas, J. C. Angélique, A.C. Mueller, F. Pougheon, C. Borcea, O. Sorlin, M. G. Saint-Laurent, C. Donzaud, Josette Duprat, J. Kiener, M. Belleguic, J. S. Winfield, Yu. Sobolev, Yu. E. Penionzhkevich, S. Leenhardt, N. A. Orr, M. G. Porquet, D. Guillemaud-Mueller, F. Azaiez, S. Grévy, I. Deloncle, and F. Marie

Subjects
Nuclear physics, Physics, High energy, Fragmentation (mass spectrometry), Spectrometer, Coulomb excitation, Atomic physics, Excitation, Beam (structure)
Abstract

A Coulomb excitation experiment has been performed in order to study the subshell closure atN = 40 for neutron-rich nuclei. This subshell effect is thought to be enhanced when largeN/Z ratios are encountered. Therefore, theZ = 2868Ni is of particular interest in order to test this behaviour. Some experimental information is already available for68Ni at low excitation energy: a 0+ 2 isomer, a 2+ state and a long-lived 5- state. The high energy of the 2+ state suggests the shell closure though its reduced transition probabilityB(E2) has never been mesured. The nuclei68Ni,70,72Zn,76Ge have been produced in the fragmentation of a86Kr beam at 60 MeV/A. The selection of these secondary beams has been performed by LISE3 spectrometer at GANIL. Performances of the detector system “Château de Cristal” and preliminary results on reduced transition probabilitiesB(E2) are presented and discussed.

Published
1998
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67. QUADRUPOLE MOMENT OF THE 7/21 ISOMER STATE OF 43MS

Author

Hiroaki Ueno, J. M. Daugas, M. Hass, M. Rajabali, Stefaan Cottenier, Yuichi Ichikawa, M. Tsuchiya, Akihiro Yoshimi, D. Kameda, K. Suzuki, L. Gaudefroy, H. Haas, N. Aoi, K. Asahi, M. Ishihara, H. Hayashi, T. Kubo, T. Inoue, Hiroshi Watanabe, Takeshi Furukawa, G. Neyens, Y. Ishii, N. Vermeulen, R. Chevrier, N. Fukuda, H. Takeda, Naohito Inabe, G. Georgiev, D. L. Balabanski, T. Nanao, T. Ohnish, and H. Iijima

Subjects
Physics, Quadrupole, State (functional analysis), Atomic physics
Published
2013
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69. Delayedγ-ray and conversion-electron spectroscopy ofA=97fission fragments

Author

N. Pillet, J.-M. Régis, Ulli Köster, C. Fransen, T. Materna, J. Le Bloas, T. Thomas, W. Rother, D. Wilmsen, M. Hackstein, M. Ramdhane, N. Warr, M. Pfeiffer, M. Rudigier, T. Malkiewicz, Guillaume Gey, A. Blazhev, Gary Simpson, J. M. Daugas, and J. Jolie

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, 0103 physical sciences, Radiochemistry, 010306 general physics, 01 natural sciences, Electron spectroscopy
Published
2013
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70. NEUTRON CAPTURE REACTIONS ON <font>Lu</font> ISOTOPES AT DANCE

Author

V. Meot, T. A. Bredeweg, A. L. Keksis, R. C. Haight, Marian Jandel, Evelyn M. Bond, P. Morel, Robert S. Rundberg, D. J. Vieira, O. Roig, J.M. Wouters, Aaron Couture, J. L. Ullmann, and J. M. Daugas

Subjects
Nuclear physics, Nuclear reaction, Radiation flux, Neutron capture, Chemistry, Neutron flux, Astrophysics::High Energy Astrophysical Phenomena, Neutron, Nuclear Experiment, Nucleon, s-process, Neutron temperature
Abstract

The DANCE (Detector for Advanced Neutron Capture Experiments) array located at the Los Alamos national laboratory has been used to obtain the neutron capture cross sections for the 175 Lu and 176 Lu isotopes with neutron energies from thermal up to 100 keV. Both isotopes are of current interest for the nucleosyn- thesis s-process in astrophysics and for applications as in reactor phys ics or in nuclear medicine. Three targets were used to perform these measurements. One was nat Lu foil and the other two were isotope-enriched targets of 175 Lu and 176 Lu. The cross sections are obtained for now through a precise neutron flux determination and a normalization at the thermal neutron cross section value. A comparison with the recent experimental data and the evaluated data of ENDF/B-VII.0 will be presented. In addition, resonances parameters and spin assignments for some resonances will be featured.

Published
2013
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72. Shape dynamics in neutron-rich Kr isotopes: Coulomb excitation of 92Kr, 94Kr and 96Kr

Author

Jan Diriken, R. Krücken, Fredrik Wenander, D. Cline, T. Kröll, B. S. Nara Singh, C. Bauer, M. Zielińska, D. Radeck, K. Moschner, M. Seidlitz, C. Fransen, L. Bettermann, Stefan Heinze, T. Davinson, Mark Huyse, A. Blazhev, G. S. Simpson, R. Wadsworth, H. De Witte, M. Pfeiffer, Herbert Hess, P. Reiter, N. Warr, Iain Darby, Kathrin Wimmer, R. Gernhäuser, M. Rudigier, M. Vermeulen, B. Bastin, Kosuke Nomura, D. M. Filipescu, J. Van de Walle, M. Cappellazzo, Georgi P. Georgiev, R. R. Rodríguez-Guzmán, Joakim Cederkäll, D. G. Jenkins, D. Mücher, K. Nowak, M. Hackstein, R. Lutter, T. Thomas, C. Mihai, K. O. Zell, P. Thöle, P. J. Napiorkowski, J. Litzinger, P. Van Duppen, Vinzenz Bildstein, M. Kowalczyk, S. Das Gupta, D. Voulot, Jonathan Butterworth, J. M. Daugas, Liam Gaffney, M. Albers, J. Jolie, L. M. Robledo, Joonas Konki, B. Siebeck, E. Fiori, Susan Rigby, N. Marginean, Janne Pakarinen, Marcus Scheck, C. Bernards, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Large Hadron Collider, ta114, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Projectile, Coulomb excitation, 01 natural sciences, 7. Clean energy, Nuclear physics, Matrix (mathematics), Excited state, 0103 physical sciences, Physics::Accelerator Physics, Neutron, Interacting boson model, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

We report on the study of excited states in 92,94,96Kr populated via projectile Coulomb excitation at safe energies. The radioactive ion beams at energies of 2.85 MeV/u were delivered by the REX-ISOLDE facility at CERN and impinged on self-supporting 194,196Pt targets. The emitted γ -rays were detected by the Miniball detector-array. A detailed description of the experimental techniques used for extracting diagonal and transitional matrix elements and of the theoretical framework is given. The present experiment reveals the moderate evolution of the collective structure in the considered neutron-rich Kr isotopic chain, which is supported by the interacting boson model combined with the self-consistent mean-field method using a microscopic Gogny energy-density functional. The theory also suggests possible shape coexistence in the exotic nucleus 96Kr. ispartof: Nuclear Physics A vol:899 pages:1-28 status: published

Published
2013
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73. Spin-aligned RI beams via two-step fragmentation reactions

Author

G. Georgiev, Akihiro Yoshimi, Yuichi Ichikawa, T. Kubo, N. Aoi, Naoki Fukuda, K. Suzuki, H. Iijima, H. Hayashi, Dimiter L. Balabanski, M. Rajabali, Masayasu Ishihara, Tsubasa Nanao, J. M. Daugas, Hideki Ueno, T. Inoue, Masato Tsuchiya, Y. Ishii, Daisuke Kameda, R. Chevrier, Tetsuya Ohnishi, Hiroshi Watanabe, Koichiro Asahi, Takeshi Furukawa, H. Takeda, N. Inabe, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), 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
Nuclear and High Energy Physics, Nuclear moments, 010308 nuclear & particles physics, Chemistry, Two step, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Fragmentation (mass spectrometry), Present method, 0103 physical sciences, Nuclear spin, Figure of merit, Nuclear moment, Atomic physics, 010306 general physics, Spin (physics), Nuclear Experiment, RI beam, Instrumentation, Projectile fragmentation, Beam (structure)
Abstract

A method to produce spin-aligned rare isotope (RI) beams has been developed, where a scheme of twostep projectile fragmentation to produce the RI of interest with high spin alignment and a technique of momentum-dispersion matching are combined. Effectiveness of the present method was demonstrated in an experiment at the RIKEN RIBF, where an RI beam of 32Al with spin alignment of 8(1)% was successfully produced from a primary beam of 48Ca, via an intermediate RI of 33Al. Figure of merit of the present method was found to be more than 50 times greater than that of the conventional method employing single-step projectile fragmentation. ispartof: Nuclear Instruments & Methods in Physics Research B vol:317 pages:769-773 ispartof: location:JAPAN, RIKEN Nishina Ctr Accelerator Based Sci, Matsue status: published

Published
2013
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74. Production of spin-aligned RI beams via the two-step fragmentation reaction

Author

H. Hayashi, Akihiro Yoshimi, Yuichi Ichikawa, T. Inoue, T. Kubo, G. Georgiev, H. Takeda, N. Aoi, Masato Tsuchiya, Y. Ishii, Tetsuya Ohnishi, Tsubasa Nanao, Naoki Fukuda, K. Suzuki, R. Chevrier, Hiroshi Watanabe, Daisuke Kameda, H. Iijima, Hideki Ueno, Takeshi Furukawa, Masayasu Ishihara, N. Inabe, J. M. Daugas, Dimiter L. Balabanski, M. Rajabali, and Koichiro Asahi

Subjects
Materials science, Fragmentation (mass spectrometry), Two step, Molecular physics, Projectile fragmentation
Published
2012
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75. Nuclear moments of μ-second isomeric fragments at BigRIPS

Author

Hiroshi Watanabe, H. Takeda, Dimiter L. Balabanski, M. Rajabali, S. Cootenier, J. M. Daugas, H. Haas, H. Hayashi, Tsubasa Nanao, M. Hass, Naoki Fukuda, K. Suzuki, Gerda Neyens, Y. Ishii, Tetsuya Ohnishi, Takeshi Furukawa, Hideki Ueno, Koichiro Asahi, N. Aoi, Daisuke Kameda, T. Kubo, H. Iijima, Masato Tsuchiya, Masayasu Ishihara, G. Georgiev, L. Gaudefroy, T. Inoue, N. Inabe, Akihiro Yoshimi, Yuichi Ichikawa, and R. Chevrier

Subjects
Physics, Nuclear physics, Nuclear structure, Projectile fragmentation
Published
2012
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76. Erratum: Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes [Phys. Rev. Lett.108, 062701 (2012)]

Author

Stefan Heinze, Herbert Hess, J. M. Daugas, P. Reiter, J. Litzinger, G. Georgiev, L. M. Robledo, C. Fransen, Joonas Konki, Kathrin Wimmer, Mark Huyse, M. Cappellazzo, G. S. Simpson, T. Davinson, T. Thomas, Kentaro Nomura, M. Pfeiffer, T. Kröll, M. Rudigier, D. Voulot, D. Cline, K. Nowak, Liam Gaffney, J. Van de Walle, A. Blazhev, R. Lutter, P. J. Napiorkowski, C. Bauer, Roman Gernhäuser, K. O. Zell, B. Bastin, Marcus Scheck, B. Siebeck, E. Fiori, Iain Darby, D. G. Jenkins, D. Radeck, L. Bettermann, M. Albers, K. Moschner, J. Jolie, Jonathan Butterworth, M. Kowalczyk, M. Vermeulen, R. Krücken, Fredrik Wenander, Susan Rigby, S. Das Gupta, Joakim Cederkäll, M. Hackstein, H. De Witte, N. Marginean, Janne Pakarinen, Takaharu Otsuka, R. R. Rodríguez-Guzmán, N. Warr, P. Thöle, M. Seidlitz, R. Wadsworth, M. Zielinska, D. Mücher, Pedro Sarriguren, C. Mihai, P. Van Duppen, C. Bernards, Vinzenz Bildstein, Jan Diriken, B. S. Nara Singh, and D. M. Filipescu

Subjects
Nuclear physics, Physics, Isotope, General Physics and Astronomy, Neutron, Coulomb excitation, Deformation (meteorology)
Published
2012
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77. Unveiling the Intruder Deformed02+State inSi34

Author

A. Buta, R. Borcea, C. Petrone, L. Caceres, D. Lebhertz, S. Calinescu, O. Sorlin, J. C. Thomas, S. Grévy, Alfredo Poves, J. Mrazek, R. Chevrier, J. M. Daugas, S. M. Lukyanov, M. Stanoiu, F. Rotaru, D. Sohler, Frédéric Nowacki, Y. E. Penionzhkevich, C. Borcea, Zs. Dombrádi, and F. Negoita

Subjects
Czech, 010308 nuclear & particles physics, Romanian, Foundation (engineering), General Physics and Astronomy, State (functional analysis), 01 natural sciences, language.human_language, Political science, Double beta decay, 0103 physical sciences, language, 010306 general physics, Humanities
Abstract

This work has been supported by BMBF 06BN109, GA of Czech Republic 202/040791, MICINN-FPA2009-13377, CM-HEPHACOSS2009/ESP-1473 (Spain), the EC through the Eurons project Contracts No. RII3-CT-3/2004-506065, No. OTKA K68801, and No. K100835, the Bolyai Foundation, and by Romanian ANCS, CNCS UEFISCDI, Project No. PN-II-RU-TE-2011- 3-0051. R. B., A. B., F. N., and F. R. acknowledge the IN2P3/ CNRS support

Published
2012
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78. Coherent investigation of nuclear data at CEA DAM: Theoretical models, experiments and evaluated data

Author

O. Roig, J.-M. Laborie, C. Le Luel, V. Méot, A. Chatillon, B. Laurent, H. Duarte, G. Belier, N. Dubray, M. Ducauze-Philippe, B. Morillon, C. Varignon, G. Gosselin, Stéphane Hilaire, Huu-Tai P. Chau, N. Authier, Eric Bauge, P. Dossantos-Uzarralde, B. Richard, J. P. Delaroche, P. Casoli, P. Morel, X. Ledoux, J. Taieb, P. Romain, J. Cartier, L. Gaudefroy, T. Granier, and J. M. Daugas

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Nuclear engineering, Theoretical models, Evaluated data, Nuclear data, Nuclear fusion, Field (computer science), Domain (software engineering)
Abstract

The domain of evaluated nuclear data involves at the same time, a close interaction between the field of nuclear applications and that of nuclear physics, and a close interaction between experiments and theory. The final product, the evaluated data file, synthesises vast amounts of information stemming from all of the above fields. In CEA DAM, all these aspects of nuclear data are investigated in a consistent way, making full use of experimental facilities and high-performance computing as well as numerous national and international collaborations, for the measurement, calculation, evaluation, and validation of nuclear data.

Published
2012
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79. Is the7/21−Isomer State ofS43Spherical?

Author

Takashi Kubo, H. Hayashi, Stefaan Cottenier, Hiroaki Ueno, H. Haas, J. M. Daugas, Georgi P. Georgiev, Takeshi Furukawa, L. Gaudefroy, D. Kameda, Masato Tsuchiya, Hiroyuki Takeda, Mustafa Rajabali, Gerda Neyens, Tsuyoshi Inoue, Masamichi Ishihara, Tsubasa Nanao, Hiroshi Watanabe, R. Chevrier, Akihiro Yoshimi, Yuichi Ichikawa, Tsuyoshi Ohnishi, H. Iijima, D. L. Balabanski, Koichiro Asahi, Nori Aoi, Y. Ishii, Naoki Fukuda, Michael Hass, Naohito Inabe, K. Suzuki, and N. Vermeulen

Subjects
Physics, Angular distribution, 010308 nuclear & particles physics, 0103 physical sciences, SHELL model, Quadrupole, General Physics and Astronomy, Atomic physics, 010306 general physics, 01 natural sciences, Spherical shape
Abstract

We report on the spectroscopic quadrupole moment measurement of the 7/2(1)(-) isomeric state in S-43(16)27 [E* = 320.5(5) keV, T-1/2 = 415(3) ns], using the time dependent perturbed angular distribution technique at the RIKEN RIBF facility. Our value, vertical bar Q(s) vertical bar = 23(3) efm(2), is larger than that expected for a single-particle state. Shell model calculations using the modern SDPF-U interaction for this mass region reproduce remarkably well the measured vertical bar Q(s) vertical bar, and show that non-negligible correlations drive the isomeric state away from a purely spherical shape.

Published
2012
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80. Low-lying spectroscopy of a few even-even silicon isotopes investigated with the multiparticle-multihole Gogny energy density functional

Author

J.-F. Berger, M. Dupuis, Vladimir Zelevinsky, N. Pillet, and J. M. Daugas

Subjects
Physics, Nuclear and High Energy Physics, Nuclear Theory, 010308 nuclear & particles physics, Generator (category theory), FOS: Physical sciences, Context (language use), Type (model theory), 01 natural sciences, 3. Good health, Nuclear Theory (nucl-th), Matrix (mathematics), Excited state, 0103 physical sciences, Isotopes of silicon, Atomic physics, 010306 general physics, Spectroscopy, Mixing (physics)
Abstract

A multiconfiguration microscopic method has been applied with the Gogny effective interaction to the calculation of low-lying positive-parity states in even-even $^{26-28}$Si isotopes. The aim of the study is to compare the results of this approach with those of a standard method of GCM type and to get insight into the predictive power of multiconfiguration methods employed with effective nucleon-nucleon force taylored to mean-field calculations. It is found that the multiconfiguration approach leads to an excellent description of the low-lying spectroscopy of $^{26}$Si, $^{28}$Si and $^{32}$Si, but gives a systematic energy shift in $^{30}$Si. A careful analysis of this phenomenon shows that this discrepancy originates from too large matrix elements in the proton-neutron residual interaction supplied by the Gogny interaction. Finally, a statistical analysis of highly excited configurations in $^{28}$Si is performed, revealing exponential convergence in agreement with previous work in the context of the shell model approach. This latter result provides strong arguments towards an implicit treatment of highly excited configurations., 17 pages, 13 figures, 11 tables

Published
2012
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81. Firstg(2+)measurement on neutron-rich72Zn, and the high-velocity transient field technique for radioactive heavy-ion beams

Author

A. Jungclaus, S. M. Lukyanov, Emyr Clement, J. M. Daugas, A. Blazhev, J. Leske, V. Kumar, Yu. E. Penionzhkevich, M. Danchev, Norbert Pietralla, L. Perrot, V. Modamio, S. Grévy, B. Mouginot, J. C. Thomas, I. Stefan, Michael Hass, K.-H. Speidel, T. J. Mertzimekis, C. Stodel, Georgi P. Georgiev, K. O. Zell, F. Nowacki, Kamila Sieja, S. Cabaret, E. Fiori, R. Lozeva, Andrew Stuchbery, J. Walker, and D. L. Balabanski

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, High velocity, 0103 physical sciences, SHELL model, Heavy ion, Neutron, 010306 general physics, Transient field, 01 natural sciences, 7. Clean energy
Abstract

This work was supported by the EU FP6 contract no. EURONS N◦RII3-CT-2004-506065, by the IAP Program, P6/23 BriX, Belgian Science Policy, by the Bulgarian Science Fund DID-02/16 and DFNR-02/5, by the Spanish Ministerio de Ciencia e Innovacion under contract nos. FPA2007-66069 and FPA2009-13377-C02-02, the Spanish Consolider-Ingenio 2010 Programme CPAN (CSD2007-00042), and by the AustralianResearch Council Discovery Grant No. DP0773273.The work of E.F. has been supported in part by the ExtreMe Matter Institute EMMI.

Published
2012
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82. Shape coexistence at N=20 and N=28 : study of 0+2 states in $^{34}$Si and $^{44}$S

Author

F. Azaiez, F. de Oliveira, R. Chevrier, B. Bastin, J. M. Daugas, F. Rotaru, O. Sorlin, J. C. Angélique, D. Lebhertz, I. Stefan, Zs. Dombrádi, S. M. Lukyanov, R. Borcea, L. Caceres, A. Buta, L. Gaudefroy, C. Stodel, F. Negoita, N. L. Achouri, S. Grévy, C. Force, Y. E. Penionzhkevich, S. Calinescu, Dóra Sohler, C. Petrone, J. C. Thomas, Alfredo Poves, J. Mrazek, C. Borcea, F. Nowacki, M. Stanoiu, 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), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), 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), Sivaramakrishnan Muralithar, 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), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Condensed matter physics, Island of inversion, Chemistry, Magic (programming), Nuclear structure, Theoretical models, 020206 networking & telecommunications, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 23.35.+g, 23.40.-s, 23.20.Lv, 25.70.Mn, 27.30.+t, 27.40.+z, 29.30.Kv, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Atomic physics, Ground state, Spectroscopy
Abstract

Expérience GANIL/LISE3/EXOGAM; International audience; It is well known that the nuclear shell structure changes for the most exotic nuclei. One of the consequences ofthis phenomenon is the modification of the "classical" magic numbers, as experimentally observed at N = 20 and N = 28.Nevertheless, the mechanisms responsible for such changes are still under discussion and more experimental information isneeded to better constrain the theoretical models. In these proceedings, we report on the discovery and the experimental studyby precise spectroscopy experiments of the 0+2 state in 34Si and 44S. The 34Si is located between the magic spherical 36S andthe deformed 32Mg, member of the so-called island of inversion, whereas 44S is located between the magic spherical 48Caand the deformed 42Si. Therefore, the structure of these nuclei, and in particular the phenomenon of shape coexistence, isof crucial importance to understand how the intruder configurations progressively dominate the ground state structure of themost exotic nuclei at both N = 20 and N = 28.

Published
2012
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83. Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes

Author

C. Bernards, Jan Diriken, M. Pfeiffer, K. Moschner, P. Reiter, M. Rudigier, H. De Witte, Jonathan Butterworth, J. M. Daugas, D. Voulot, Iain Darby, Mark Huyse, Takaharu Otsuka, R. R. Rodríguez-Guzmán, Liam Gaffney, R. Gernhäuser, P. Van Duppen, R. Krücken, Fredrik Wenander, Vinzenz Bildstein, N. Warr, M. Zielinska, D. Mücher, T. Kröll, B. S. Nara Singh, C. Mihai, M. Seidlitz, Joakim Cederkäll, Georgi P. Georgiev, B. Bastin, P. Thöle, D. Radeck, Susan Rigby, S. Das Gupta, D. G. Jenkins, M. Albers, C. Fransen, J. Van de Walle, R. Wadsworth, Pedro Sarriguren, T. Thomas, B. Siebeck, J. Jolie, Marcus Scheck, N. Marginean, M. Hackstein, D. M. Filipescu, L. Bettermann, Janne Pakarinen, Thomas Davinson, G. S. Simpson, P. J. Napiorkowski, E. Fiori, A. Blazhev, K. Nowak, L. M. Robledo, Joonas Konki, M. Kowalczyk, R. Lutter, Herbert Hess, K. O. Zell, Kathrin Wimmer, Kosuke Nomura, M. Vermeulen, M. Cappellazzo, Stefan Heinze, J. Litzinger, D. Cline, C. Bauer, 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), REX-ISOLDE, Research unit Nuclear & Hadron Physics, and UAM. Departamento de Física Teórica

Subjects
Quantum phase transition, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], REX-ISOLDE, Nuclear Theory, QUANTUM PHASE-TRANSITIONS, General Physics and Astronomy, chemistry.chemical_element, Context (language use), Coulomb excitation, Nuclear Structure, 01 natural sciences, REGION, Nuclear physics, 0103 physical sciences, Nuclear Physics - Experiment, Neutron, 010306 general physics, Nuclear Experiment, DETECTOR, INTERACTING BOSONS, Physics, EXCITATIONS, COLLECTIVE NUCLEAR-STATES, ta114, 010308 nuclear & particles physics, Krypton, Física, chemistry, Excited state, SHELL-MODEL, Interacting boson model, Atomic physics, Ground state
Abstract

The neutron-rich nuclei Kr94,96 were studied via projectile Coulomb excitation at the REX-ISOLDE facility at CERN. Level energies of the first excited 2 + states and their absolute E2 transition strengths to the ground state are determined and discussed in the context of the E(21+) and B(E2;21+→01+) systematics of the krypton chain. Contrary to previously published results no sudden onset of deformation is observed. This experimental result is supported by a new proton-neutron interacting boson model calculation based on the constrained Hartree-Fock-Bogoliubov approach using the microscopic Gogny-D1M energy density functional. © 2012 American Physical Society., This work was supported by the BMBF under Contracts No. 06KY9136 and No. 06MT238, by ENSAR, by the DFG Cluster of Excellence Origin and Structure of the Universe, and by the grant-in-aid for scientific research for JSPS Fellows (Grant No. 217368). One of the authors (J. D.) would like to acknowledge the support of FWOVlaanderen (Belgium).

Published
2012
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84. Production of spin-controlled rare isotope beams

Author

N. Aoi, J. M. Daugas, R. Chevrier, G. Georgiev, Takeshi Furukawa, Hiroshi Watanabe, Masato Tsuchiya, Hideki Ueno, H. Hayashi, Y. Ishii, N. Inabe, T. Kubo, T. Inoue, Dimiter L. Balabanski, M. Rajabali, Tetsuya Ohnishi, Masayasu Ishihara, H. Iijima, Tsubasa Nanao, H. Takeda, Koichiro Asahi, Akihiro Yoshimi, Yuichi Ichikawa, Naoki Fukuda, K. Suzuki, Daisuke Kameda, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), 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, Light nucleus, Particle properties, Isotope, 010308 nuclear & particles physics, Nuclear structure, General Physics and Astronomy, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Chemical physics, 0103 physical sciences, Atomic physics, Nuclear Experiment (nucl-ex), 010306 general physics, Spin (physics), Nuclear Experiment
Abstract

The degree of freedom of spin in quantum systems serves as an unparalleled laboratory where intriguing quantum physical properties can be observed, and the ability to control spin is a powerful tool in physics research. We propose a novel method for controlling spin in a system of rare isotopes which takes advantage of the mechanism of the projectile fragmentation reaction combined with the momentum-dispersion matching technique. The present method was verified in an experiment at the RIKEN RI Beam Factory, in which a degree of alignment of 8% was achieved for the spin of a rare isotope Al-32. The figure of merit for the present method was found to be greater than that of the conventional method by a factor of more than 50., Comment: 18 pages, 5 figures

Published
2012
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85. Study of the surrogate-reaction method applied to neutron-induced capture cross sections

Author

I. Companis, P. Morel, X. Derkx, C. Theroine, S. Czajkowski, G. Boutoux, J. M. Daugas, I Matea, V. Méot, N. Capellan, L. Tassan-Got, J.T. Burke, O. Roig, A. Bail, Olivier Serot, T. Faul, K.-H. Schmidt, N. Pillet, M. Aïche, Beatriz Jurado, L. Mathieu, G. Barreau, Aval du cycle et Energie Nucléaire (ACEN), 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), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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), Service de Physique des Réacteurs et du Cycle (SPRC), Département Etude des Réacteurs (DER), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Institut de Physique Nucléaire d'Orsay (IPNO), 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 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
Physics, Nuclear and High Energy Physics, Angular-momentum distribution, 010308 nuclear & particles physics, Neutron emission, Astrophysics::High Energy Astrophysical Phenomena, chemistry.chemical_element, Germanium, Neutron-induced capture cross section, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Residual, 01 natural sciences, Gamma-decay probability, chemistry, Excited state, Surrogate-reaction method, 0103 physical sciences, Neutron, Atomic physics, Experimental methods, 010306 general physics, Nuclear Experiment, Spin-½
Abstract

Gamma-decay probabilities of 173Yb and 176Lu have been measured using the surrogate reactions 174Yb(3He,αγ)173Yb* and 174Yb(3He,pγ)176Lu*, respectively. For the first time, the gamma-decay probabilities have been obtained with two independent experimental methods based on the use of C6D6 scintillators and Germanium detectors. Our results for the radiative-capture cross sections are several times higher than the corresponding neutron-induced data. To explain these differences, we have used our gamma-decay probabilities to extract rather direct information on the spin distributions populated in the transfer reactions used. They are about two times wider and the mean values are 3 to 4 ℏ higher than the ones populated in the neutron-induced reactions. As a consequence, in the transfer reactions neutron emission to the ground and first excited states of the residual nucleus is strongly suppressed and gamma-decay is considerably enhanced.

Published
2012
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86. Production of spin-aligned RI beam via two-step fragmentation with dispersion matching

Author

Nori Aoi, J. M. Daugas, K. Suzuki, H. Takeda, Hiroshi Watanabe, H. Hayashi, Takeshi Furukawa, Masato Tsuchiya, D. L. Balabanski, G. Georgiev, Akihiro Yoshimi, Y. Ishii, Yuichi Ichikawa, Mustafa Rajabali, Tsuyoshi Inoue, N. Inabe, T. Kubo, Daisuke Kameda, Koichiro Asahi, N. Fukuda, Masamichi Ishihara, Tsuyoshi Ohnishi, H. Iijima, Hideki Ueno, R. Chevrier, Tsubasa Nanao, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), 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, History, Matching (graph theory), 010308 nuclear & particles physics, business.industry, Two step, 21.10.Hw Spin, parity, and isobaric spin 27.40.+z 39(less-than-or-equal-to)A(less-than-or-equal-to)58 27.30.+t 20(less-than-or-equal-to)A(less-than-or-equal-to)38 21.60.-n Nuclear structure models and methods 25.70.Mn Projectile, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Computer Science Applications, Education, Optics, Fragmentation (mass spectrometry), 0103 physical sciences, Dispersion (optics), Physics::Accelerator Physics, 010306 general physics, business, Focus (optics), Nuclear Experiment, Beam (structure), Spin-½
Abstract

International audience; To produce a radioactive-isotope (RI) beam with high spin alignment, we have developed a novel method, the two-step projectile-fragmentation (PF) method, that employs momentum-dispersion matching. An on-line experiment to produce 32Al from 48Ca via 33Al was performed at RIKEN RI Beam Factory. In the experiment, we succeeded in producing approximately 8% spin alignment in an RI beam of 32Al. In this paper, we focus on evaluating the magnitude of spin alignment realized in one-nucleon removal from 33Al

Published
2012
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87. Unveiling the intruder deformed 02+ state in 34Si

Author

F, Rotaru, F, Negoita, S, Grévy, J, Mrazek, S, Lukyanov, F, Nowacki, A, Poves, O, Sorlin, C, Borcea, R, Borcea, A, Buta, L, Cáceres, S, Calinescu, R, Chevrier, Zs, Dombrádi, J M, Daugas, D, Lebhertz, Y, Penionzhkevich, C, Petrone, D, Sohler, M, Stanoiu, J C, Thomas, and UAM. Departamento de Física Teórica

Subjects
Simultaneous detection, Física, Large deformations, Electric monopole strength, Shell gap, Shell models, Weak-mixing
Abstract

The 02+ state in Si34 has been populated at the GANIL-LISE3 facility through the β decay of a newly discovered 1 + isomer in Al34 of 26(1) ms half-life. The simultaneous detection of e +e - pairs allowed the determination of the excitation energy E(02+)=2719(3)keV and the half-life T 1/2=19.4(7)ns, from which an electric monopole strength of ρ2(E0)=13.0(0.9)×10 -3 was deduced. The 21+ state is observed to decay both to the 01+ ground state and to the newly observed 02+ state [via a 607(2) keV transition] with a ratio R(21+→01+/21+→02+)=1380(717). Gathering all information, a weak mixing with the 01+ and a large deformation parameter of β=0.29(4) are found for the 02+ state, in good agreement with shell model calculations using a new sdpf-u-mix interaction allowing np-nh excitations across the N=20 shell gap, This work has been supported by BMBF 06BN109, GA of Czech Republic 202/040791, MICINN-FPA2009-13377, CM-HEPHACOSS2009/ESP-1473 (Spain), the EC through the Eurons project Contracts No. RII3-CT-3/2004-506065, No. OTKA K68801, and No. K100835, the Bolyai Foundation, and by Romanian ANCS, CNCS UEFISCDI, Project No. PN-II-RU-TE-2011- 3-0051. R. B., A. B., F. N., and F. R. acknowledge the IN2P3/ CNRS support

Published
2012

88. In-beam fast-timing measurements inCd103,105,107

Author

I. Căta-Danil, P. Detistov, K. O. Zell, D. L. Balabanski, S. Lalkovski, N. Marginean, D. Bucurescu, D. S. Judson, T. Glodariu, M. Rudigier, A. Negret, D. Deleanu, L. Stroe, L. Atanasova, N. V. Zamfir, T. Sava, D. M. Filipescu, D. Ghiţă, Georgi P. Georgiev, Gh. Căta-Danil, S. Pascu, R. Lozeva, J. Jolie, J.-M. Régis, S. Kisyov, R. Mărginean, G. Suliman, C. Mihai, D. Radulov, M. Zhekova, and J. M. Daugas

Subjects
Physics, Nuclear and High Energy Physics, Fusion, Isotope, 010308 nuclear & particles physics, Evaporation, Half-life, 7. Clean energy, 01 natural sciences, Nuclear physics, Isotopes of cadmium, 0103 physical sciences, Atomic physics, 010306 general physics, Radioactive decay, Excitation, Beam (structure)
Abstract

Fast-timing measurements were performed in the region of the medium-mass $^{103,105,107}\mathrm{Cd}$ isotopes, produced in fusion evaporation reactions. Results on new and reevaluated half-lives are analyzed within a systematic study of transition rates. The $7/{2}_{1}^{+}$ states in $^{103,105,107}\mathrm{Cd}$ are interpreted as arising from a single-particle excitation. The $9/{2}^{+}$ states configuration assignment is based on the observed decay branches.

Published
2011
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89. Direct evidence for inelastic neutron 'acceleration' byLu177m

Author

Alain Letourneau, J. M. Daugas, V. Méot, O. Roig, P. Morel, A. Menelle, G. Belier, and B. Rossé

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Neutron flux, Astrophysics::High Energy Astrophysical Phenomena, Neutron cross section, Resonance, Neutron, Neutron radiation, Atomic physics, Inelastic scattering, Nucleon, Inelastic neutron scattering
Abstract

The inelastic neutron acceleration cross section on the long-lived metastable state of {sup 177}Lu has been measured using a direct method. High-energy neutrons have been detected using a specially designed setup placed on a cold neutron beam extracted from the ORPHEE reactor in Saclay. The 146{+-}19 b inelastic neutron acceleration cross section in the ORPHEE cold neutron flux confirms the high cross section for this process on the {sup 177}Lu{sup m} isomer. The deviation from the 258{+-}58 b previously published obtained for a Maxwellian neutron flux at a 323 K temperature could be explained by the presence of a low energy resonance. Resonance parameters are deduced and discussed.

Published
2011
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90. β-decay measurements forN>40Mn nuclei and inference of collectivity for neutron-rich Fe isotopes

Author

C. R. Bingham, F. Becker, F. de Oliveira Santos, Georgi P. Georgiev, I. Matea, O. Roig, Ch. Stodel, H. Grawe, Robert Grzywacz, M. Lewitowicz, M. Sawicka, J. Giovinazzo, G. Belier, E. Bouchez, E. Dragulescu, D. Verney, F. Ibrahim, J. Libert, M. Pfützner, M. Stanoiu, K. P. Rykaczewski, P. Mayet, J. P. Delaroche, O. Perru, F. Hammache, V. Méot, A. Buta, J. E. Sauvestre, Ch. Theisen, J. Żylicz, Michel Girod, R. Borcea, O. Sorlin, I. Stefan, F. Negoita, M. G. Saint-Laurent, and J. M. Daugas

Subjects
Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Neutron emission, Branching fraction, 7. Clean energy, 01 natural sciences, Nuclear physics, Neutron number, Isotopes of vanadium, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Delayed neutron, Radioactive decay
Abstract

A decay spectroscopic study of the neutron-rich isotopes has been performed using fragmentation of a 86Kr primary beam. Fragments from this reaction have been selected by the LISE2000 spectrometer at the Grand Acc el erateur National d Ions Lourds (GANIL). Half-lives of 29 isotopes, including the first ones identified for 61Ti (15 4 ms), 64V (19 8 ms), and 71Fe (28 5 ms), have been determined and compared with model predictions. 67,68Mn -delayed rays were observed for the first time. The branching for the -delayed neutron emission was measured to be greater than 10(5)% in the 67Mn decay. The 67Fe isomeric level is firmly determined at higher energy than assigned in previous works. The excitation energies of the first (2+) and (4+) states of 68Fe are suggested to lie at 522(1) and 1389(1) keV, respectively, thus bringing confirmation of assignments based on in-beam -ray spectroscopy. Beyond-mean-field calculations with the Gogny D1S force have been performed for even-mass nuclei through the Fe isotopic chain. Not only 68Fe but most of the neutron-rich Fe isotopes with neutron numbers below N = 50 are interpreted as soft rotors. The calculated mean occupancy of the neutron g9/2 and d5/2 orbitals in correlated ground statesmore » is steadily growing with increasing neutron number throughout the isotopic chain. Interpretation of 67Fe data is based upon the present calculations for the 66Fe and 68Fe even cores.« less

Published
2011
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91. Neutron-induced capture cross sections via the surrogate reaction method

Author

P. Morel, L. Tassan-Got, I. Companis, S. Czajkowski, D. Dassié, C. Theroine, Julien Taieb, Beatriz Jurado, J.T. Burke, V. Méot, J. M. Daugas, E. Bauge, G. Boutoux, B. Haas, N. Pillet, G. Barreau, M. Aïche, F. Gunsing, X. Derkx, Olivier Serot, T. Faul, O. Roig, A. Bail, N. Capellan, L. Mathieu, L. Gaudefroy, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de 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), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), T. Granier, B. Laurent, X. Ledoux and J.-G. Marmouget, X. Ledoux, J.-G. Marmouget, Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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 Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Nuclear reaction, Nuclear transmutation, 010308 nuclear & particles physics, Neutron emission, Chemistry, Fission, Physics, QC1-999, Minor actinide, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Charged particle, Nuclear physics, Cross section (physics), 0103 physical sciences, Neutron, Atomic physics, 010306 general physics
Abstract

The full papers will be published in EPJ Web of Conferences.; International audience; The surrogate reaction method is an indirect way of determining cross sections for nuclear reactions that proceed through a compound nucleus. In this method, the compound nucleus is produced via an alternative (surrogate) reaction and its decay (by fission, gamma or neutron emission) is measured in coincidence with the outgoing appropriate charged particle. This technique has enabled neutron-induced cross sections to be extracted for nuclear reactions on short-lived nuclei that otherwise could not be measured. The CENBG collaboration has successfully applied this technique to determine the neutron-induced fission cross sections of several short-lived nuclei such as 233Pa, 242,243Cm and 241Am. These data are very important for the development of the Th/U cycle and for minor actinide transmutation. We currently investigate whether this powerful technique can also be used to determine the neutron-induced capture cross sections. For this purpose we will use the surrogate reaction 174Yb(3He,pγ)176Lu to infer the well known 175Lu(n,γ) cross section and compare the results with the directly measured neutron-induced data. The experimental set-up and the first results will be presented. We will also discuss our future plans to use the surrogate method for extracting actinides (n,γ) cross sections.

Published
2010
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92. Publisher’s Note:gfactor of theCl44ground state: Probing the reducedZ=16andN=28gaps [Phys. Rev. C81, 034308 (2010)]

Author

J. C. Thomas, M. De Rydt, D. Kameda, J. M. Daugas, F. de Oliveira Santos, P. Morel, G. Neyens, V. Kumar, R. Lozeva, S. Grévy, P. Vingerhoets, O. Sorlin, T. J. Mertzimekis, L. Gaudefroy, N. Vermeulen, Takashi Nagatomo, C. Stodel, and L. Perrot

Subjects
Physics, Nuclear and High Energy Physics, Landé g-factor, g factor, Isotopes of chlorine, Resonance, Atomic physics, Ground state, Dimensionless quantity
Published
2010
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93. gfactor of theCl44ground state: Probing the reducedZ=16andN=28gaps

Author

P. Vingerhoets, J. C. Thomas, Gerda Neyens, R. Lozeva, J. M. Daugas, O. Sorlin, L. Perrot, T. J. Mertzimekis, V. Kumar, N. Vermeulen, S. Grévy, Daisuke Kameda, M. De Rydt, T. Nagatomo, L. Gaudefroy, C. Stodel, P. Morel, and F. de Oliveira Santos

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Landé g-factor, Hadron, Elementary particle, 01 natural sciences, Baryon, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon, Ground state, Hyperfine structure, Dimensionless quantity
Abstract

The $g$ factor of the $^{44}\mathrm{Cl}$ ground state is measured at the LISE fragment separator at the Grand Acc\'el\'erateur National d'Ions Lourds (GANIL) using the $\ensuremath{\beta}$ nuclear magnetic resonance technique, resulting in $g$($^{44}\mathrm{Cl}$)$=(\ensuremath{-})0.2749(2)$. An analysis of the $g$ factor value and of the theoretical level scheme in the shell-model framework reveals the presence of odd-proton ${s}_{1/2}$ configurations and neutron excitation across the $N=28$ shell gap in the ground state of $^{44}\mathrm{Cl}$. In addition, the measured $g$ factor strongly supports a ${2}^{\ensuremath{-}}$ spin assignment for the $^{44}\mathrm{Cl}$ ground state.

Published
2010
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94. Low-lying isomeric levels inCu75

Author

J. M. Daugas, T. Faul, H. Grawe, M. Pfützner, R. Grzywacz, M. Lewitowicz, N. L. Achouri, J. C. Angélique, D. Baiborodin, R. Bentida, R. Béraud, C. Borcea, C. R. Bingham, W. N. Catford, A. Emsallem, G. de France, K. L. Grzywacz, R. C. Lemmon, M. J. Lopez Jimenez, F. de Oliveira Santos, P. H. Regan, K. Rykaczewski, J. E. Sauvestre, M. Sawicka, M. Stanoiu, K. Sieja, and F. Nowacki

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Isotopes of copper, Hadron, Nuclear structure, 7. Clean energy, 01 natural sciences, Baryon, Crystallography, 0103 physical sciences, Atomic physics, 010306 general physics, Ground state, Nucleon, Spin (physics), Excitation
Abstract

Isomeric low-lying states were identified and investigated in the {sup 75}Cu nucleus. Two states at 61.8(5)- and 128.3(7)-keV excitation energies with half-lives of 370(40)- and 170(15)-ns were assigned as {sup 75m1}Cu and {sup 75m2}Cu, respectively. The measured half-lives combined with the recent spin assignment of the ground state allow one to deduce tentatively spin and parity of the two isomers and the dominant multipolarities of the isomeric transitions with respect to the systematics of the Cu isotopes. Shell-model calculations using an up-to-date effective interaction reproduce the evolution of the 1/2{sup -}, 3/2{sup -}, and 5/2{sup -} states for the neutron-rich odd-mass Cu isotopes when filling the nug{sub 9/2}. The results indicate a significant change in the nuclear structure in this region, where a single-particle 5/2{sup -} state coexists with more and more collective 3/2{sup -} and 1/2{sup -} levels at low excitation energies.

Published
2010
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95. Neutron capture reactions on Lu isotopes at DANCE

Author

Robert S. Rundberg, A. L. Keksis, Evelyn M. Bond, Marian Jandel, W. A. Taylor, J. L. Ullmann, V. Méot, J. M. Daugas, Todd Bredeweg, D. J. Vieira, O. Roig, John M. O'Donnell, R. C. Haight, Aaron Couture, J.M. Wouters, and P. Morel

Subjects
Physics, Isotope, Astrophysics::High Energy Astrophysical Phenomena, QC1-999, Neutron temperature, Nuclear physics, Cross section (physics), Neutron capture, Neutron flux, Nucleosynthesis, Neutron, Spin (physics), Nuclear Experiment
Abstract

The DANCE (Detector for Advanced Neutron Capture Experiments) array located at the Los Alamos national laboratory has been used to obtain the neutron capture cross sections for the 175Lu and 176Lu isotopes with neutron energies from thermal up to 100 keV. Both isotopes are of current interest for the nucleosynthesis s-process in astrophysics and for applications as in reactor physics or in nuclear medicine. Three targets were used to perform these measurements. One was natLu foil and the other two were isotope-enriched targets of 175Lu and 176Lu. The cross sections are obtained for now through a precise neutron flux determination and a normalization at the thermal neutron cross section value. A comparison with the recent experimental data and the evaluated data of ENDF/B-VII.0 will be presented. In addition, resonances parameters and spin assignments for some resonances will be featured.

Published
2010

96. g factor of the 7- isomer in 126Sn and first observation of spin-alignment in relativistic fission

Author

H. Schaffner, H. J. Wollersheim, A. Jungclaus, M. Ionescu-Bujor, R. Lozeva, J. Gerl, M. Pfützner, Gary Simpson, W. Prokopowicz, J. M. Daugas, T.R. Saito, O. Perru, F. Becker, C. Brandau, S. K. Chamoli, M. De Rydt, S. Mallion, P. Bednarczyk, J. Jolie, I. Kojouharov, Michael Hass, N. Vermeulen, H. Grawe, A. Blazhev, N. Kurz, L. Caceres, Gerda Neyens, P. Doornenbal, A. Maj, G. Ilie, Zs. Podolyák, J. Walker, M. Górska, J. Grȩbosz, D. L. Balabanski, K. Turzó, M. Kmiecik, L. Atanasova, E. Werner-Malento, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Physics, Nuclear and High Energy Physics, Angular momentum, Cluster decay, Isotope, Nuclear moments, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Fission, g factor, Nuclear Theory, Shell model calculations, Lifetimes, Projectile fission reactions, 01 natural sciences, Microsecond, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Nuclear Experiment, Beam (structure)
Abstract

We report on the g factor measurement of the isomeric 7 − state ( E * = 2219 keV , T 1 / 2 = 5.9 ( 8 ) μs ) in the neutron-rich 126Sn nucleus. The nucleus was produced by the fission of a relativistic 238U beam and reaction products were selected by the FRS fragment separator at GSI. For the first time, spin-alignment was observed after relativistic fission. It was used to deduce the g factor of the 7 − isomeric state, g ( 7 − ) = − 0.098 ( 9 ) , from the measured perturbed angular distribution of its γ decay using the RISING Cluster detectors. The observed value confirms the suggested ν ( h 11 / 2 − 1 d 3 / 2 − 1 ) dominant configuration, which has been proposed for the 7 − isomers in neutron-rich Sn isotopes. The failure of the g factor additivity rule and the importance of core polarization evolution with increasing distance from the doubly-magic 132Sn is discussed. The first observation of 18(8)% of spin-alignment produced by the relativistic fission of a 238U beam paves the way to study moments of neutron-rich (sub-)microsecond isomers, which are difficult to align by other means.

Published
2010
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97. In-beam measurements of sub-nanosecond nuclear lifetimes with a mixed array of HPGe and LaBr(3):Ce detectors

Author

S. Lalkovski, S. Kisyov, Georgi P. Georgiev, G. Deyanova, D. Deleanu, L. Atanasova, G. Suliman, C. Mihai, Alexandru Negret, D. L. Balabanski, T. Sava, T. Glodariu, D. Bucurescu, N. V. Zamfir, P. Detistov, Gh. Căta-Danil, J. M. Daugas, D. Radulov, R. Marginean, M. Ivascu, L. Stroe, I. Căta-Danil, R. Lozeva, N. Marginean, D. M. Filipescu, D. Ghiţă, K. A. Gladnishki, S. Pascu, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, NEUTRON-RICH NUCLEI, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, Resolution (electron density), Order (ring theory), Nanosecond, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Spectral line, Semiconductor detector, Nuclear physics, 0103 physical sciences, Nuclear fusion, Atomic physics, 010306 general physics, Beam (structure)
Abstract

A fast-timing method to determine lifetimes of nuclear states in the sub-nanosecond domain is presented. It is based on in-beam measurements of triple-gamma coincidences in heavy-ion fusion-evaporation reactions, performed with an array of HPGe and LaBr(3):Ce detectors. The high-energy resolution HPGe detectors are used to define de-exciting cascades, while the fast LaBr(3):Ce detectors are used to determine the decay time spectra of selected levels fed by these cascades. A special method to treat the time information of an array of fast detectors is employed in order to fully use the efficiency of the array. Two measurements are presented to illustrate the method: a re-determination of the known half-life T(1/2) = 0.7 ns of 7/2(+) level in (107)Cd (test experiment), and the determination of a half-life T(1/2) = 0.7 ns of the E(x) = 205 keV, J(pi) = 7/2(+) level in (107)Cd (test experiment), and the determination of a half-life T(1/2) = 47 ps for the E(x) = 367 keV, J(pi) = 3/2(+) state of (199)Tl..

Published
2010
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98. Spin-alignment and g-factor measurement of the I(pi)=12(+) isomer in (192)Pb produced in the relativistic-energy fragmentation of a (238)U beam

Author

F. Becker, S. K. Chamoli, P. Bednarczyk, S. Mallion, W. Prokopowicz, J. M. Daugas, B. Million, W. Mȩczyński, E. Werner-Malento, A. Saltarelli, S. Chmel, M. Hass, A. Krasznahorkay, A. Maj, L. Caceres, Gerda Neyens, M. Ionescu-Bujor, D. Montanari, I. Kojuharov, P. Detistov, S. Brambilla, J. Gerl, F. Camera, P. Doornenbal, S. Pietri, M. Pfützner, M. Kmiecik, H. J. Wollersheim, Norio Saito, R. Lozeva, O. Wieland, L. Atanasova, J. Jolie, G. Ilie, J. Grȩbosz, G. S. Simpson, S. Myalski, K. H. Maier, M. Ciemała, G. Lo Bianco, Georgi P. Georgiev, N. Blasi, Dirk Rudolph, T. Saito, M. Lach, F. C. L. Crespi, Robert Hoischen, Zs. Podolyák, D. L. Balabanski, M. Ziȩbliński, N. Vermeulen, C. M. Petrache, K. Mazurek, M. Górska, A. Bracco, K. A. Gladnishki, S. Lakshmi, G. Benzoni, S. Leoni, R. Kulessa, H. Grawe, J. Styczen, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), and ILL

Subjects
Physics, Nuclear and High Energy Physics, Magnetic moment, NUCLEI, 010308 nuclear & particles physics, Relativistic energy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], FISSION, 01 natural sciences, 7. Clean energy, LISE, Separation process, SEPARATORS, GSI, Fragmentation (mass spectrometry), MOMENTS, 0103 physical sciences, Pi, ISOTOPES, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract

The feasibility of measuring g -factors using the TDPAD method applied to high-energy, heavy fragmentation products is explored. The 2623keV $\ensuremath I^{\pi}=12^+$ isomer in 192Pb with $ \tau$ = 1.57 μs has been produced using the fragmentation of a 1A GeV 238U beam. The results presented demonstrate for the first time that such heavy nuclei produced in a fragmentation reaction with a relativistic beam are sufficiently well spin-aligned. Moreover, the rather large value of the alignment, 28(10)% of the maximum possible, is preserved during the separation process allowing the determination of magnetic moments. The measured values of the lifetime, $ \tau$ = 1.54(9) μs, and the g -factor, g = - 0.175(20) , agree with the results of previous investigations using fusion-evaporation reactions.

Published
2010
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99. Electric quadrupole moment of the neutron-rich 33Al

Author

Y. Hasama, L. Gaudefroy, K. Shimada, C. Stodel, J. C. Thomas, Akihiro Yoshimi, D. Kameda, D. L. Balabanski, W. Vanderheijden, J. M. Daugas, Koichiro Asahi, Hiroaki Ueno, N. Vermeulen, M. Depuydt, S. Grévy, P. Vingerhoets, Gerda Neyens, M. De Rydt, Takashi Nagatomo, Yuichi Ichikawa, P. Morel, L. Perrot, RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Tohoku University [Sendai], Tokyo Institute of Technology [Tokyo] (TITECH), Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences (BAS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Instituut voor Kern-en Stralingsfysica (IKS), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), 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 de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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
Nuclear and High Energy Physics, 21.10.Ky, 76.60.Gv, 21.60.Cs, 25.70.Mn, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Electromagnetic moments, Shell model, Nuclear physics, magnetic-moments, 0103 physical sciences, Nuclear fusion, Neutron, 010306 general physics, Physics, Magnetic moment, 010308 nuclear & particles physics, Island of inversion, nucleus, island of inversion, exotic nuclei, Projectile and target fragmentation, Quadrupole, b-NMR, nuclear quadrupole moment, Quadrupole resonance, Atomic physics, descendants, Nucleon, Nuclear quadrupole resonance, beta-decay
Abstract

The nuclear electric quadrupole moment (Q moment) of the neutron-rich nucleus 33Al (I = 5/2 , T 1/2 = 41 ms) has been measured by the $ \beta$ -ray detected nuclear quadrupole resonance ( $ \beta$ -NQR) method for the first time. The 33Al nucleus is considered to be on the border of the island of inversion within which a significant intrusion of the pf orbits occurs across the N = 20 shell gap and the intrusion causes an anomalous enhancement of the Q moment. Polarized 33Al nuclei were produced from 36S (77.5MeV/u beams through the fragmentation process and separated by LISE fragment separator at GANIL. The 33Al nuclei were implanted into a Al2O3 single-crystal plate and the $ \beta$ -NQR spectrum was successfully obtained.

Published
2009
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100. Single and Multi-Nucleon Transfer Reactions for Nuclear Moment Studies Toward Radioactive-Ion Beams

Author

R. L. Lozeva, D. L. Balabanski, G. P. Georgiev, G. Audi, A. Blazhev, S. Cabaret, J.-M. Daugas, T. Faul, M. Ferraton, E. Fiori, C. Gaulard, K. Hauschilda, F. Ibrahim, J. Jolie, A. Lopez-Martens, P. Morel, K. Moschner, L. Risegari, O. Roig, S. Szilner, D. Verney, D. T. Yordanov, K.-O. Zell, Yu. E. Penionzhkevich, S. M. Lukyanov, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CSNSM MECA, 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), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and 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)

Subjects
Nuclear reaction, Physics, education.field_of_study, Hadron, Population, Nuclear Theory, 020206 networking & telecommunications, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Spectral line, Nuclear physics, Quadrupole, Moment (physics), 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Atomic physics, Nucleon, education, Spin (physics), Nuclear Experiment
Abstract

International audience; This study is a part of an experimental program to measure nuclear moments in transfer reactions. It aims to probe for a first time the nuclear -spin orientation in multi-nucleon transfer. Fist experiments were performed to measure the quadrupole moment of an isomeric state in 66Cu (Ipi = 6−, Ex = 1154 keV, T1/2 = 595(20) ns) in single nucleon transfer and the population of µs isomers in 66Cu and 63Ni in multi-nucleon transfer. The experimentally tested methodology allows broad applications toward more exotic species and feasibility of these reactions to produce species away from stability.

Published
2009
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