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165 results on '"J. M. Daugas"'

1. Observation of a γ-decaying millisecond isomeric state in 128Cd80

Author

A. Jungclaus, H. Grawe, S. Nishimura, P. Doornenbal, G. Lorusso, G.S. Simpson, P.-A. Söderström, T. Sumikama, J. Taprogge, Z.Y. Xu, H. Baba, F. Browne, N. Fukuda, R. Gernhäuser, G. Gey, N. Inabe, T. Isobe, H.S. Jung, D. Kameda, G.D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, Y.K. Kwon, Z. Li, H. Sakurai, H. Schaffner, Y. Shimizu, K. Steiger, H. Suzuki, H. Takeda, Zs. Vajta, H. Watanabe, J. Wu, A. Yagi, K. Yoshinaga, G. Benzoni, S. Bönig, K.Y. Chae, L. Coraggio, J.-M. Daugas, F. Drouet, A. Gadea, A. Gargano, S. Ilieva, N. Itaco, F.G. Kondev, T. Kröll, G.J. Lane, A. Montaner-Pizá, K. Moschner, D. Mücher, F. Naqvi, M. Niikura, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, Zs. Podolyák, and A. Wendt

Subjects
Isomeric decays, Shell model calculations, Transition strengths, Physics, QC1-999
Abstract

A new high-spin isomer in the neutron-rich nucleus 128Cd was populated in the projectile fission of a 238U beam at the Radioactive Isotope Beam Factory at RIKEN. A half-life of T1/2=6.3(8) ms was measured for the new state which was tentatively assigned a spin/parity of (15−). The experimental results are compared to shell model calculations performed using state-of-the-art realistic effective interactions and to the neighbouring nucleus 129Cd. In the present experiment no evidence was found for the decay of a 18+ E6 spin-trap isomer, based on the complete alignment of the two-neutron and two-proton holes in the 0h11/2 and the 0g9/2 orbit, respectively, which is predicted to exist by the shell model.

Published
2017
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2. Nuclear magnetic moment of the neutron-rich nucleus O21

Author

Y. Ishibashi, A. Gladkov, Y. Ichikawa, A. Takamine, H. Nishibata, T. Sato, H. Yamazaki, T. Abe, J. M. Daugas, T. Egami, T. Fujita, G. Georgiev, K. Imamura, T. Kawaguchi, W. Kobayashi, Y. Nakamura, A. Ozawa, M. Sanjo, N. Shimizu, D. Tominaga, L. C. Tao, K. Asahi, H. Ueno, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]
Abstract

International audience; The ground-state magnetic dipole moment of the neutron-rich O21 isotope has been measured via β-ray-detected nuclear magnetic resonance (β-NMR) spectroscopy by using a spin-polarized secondary beam of O21 produced from the Ne22 primary beam. From the present measurement, the g factor |gexp(Og.s.21)|=0.6036(14) has been determined. Based on the comparison of this value with Schmidt values, we unambiguously confirm the νd5/2 configuration with spin and parity assignments Iπ=5/2+ for the O21 ground state, suggested by previously reported studies. Consequently, the magnetic moment has been determined as μexp(Og.s.21)=(−)1.5090(35)μN. The obtained experimental magnetic moment is in good agreement with the predictions of the shell-model calculations using the USD, YSOX, and SDPF-M interactions as well as random phase approximation (RPA) calculations. This observation indicates that the O21 nucleus in its ground state does not manifest any anomalous structure and is not influenced by the proximity of the drip line.

Published
2023
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3. Gamow-Teller decay of Te142 to I142

Author

B. Moon, C.-B. Moon, A. Odahara, R. Lozeva, S. Nishimura, C. Yuan, F. Browne, P. Doornenbal, G. Lorusso, Z. Patel, S. Rice, L. Sinclair, P.-A. Söderström, T. Sumikama, H. Watanabe, J. Wu, Z. Y. Xu, A. Yagi, D. S. Ahn, H. Baba, F. L. Bello Garrote, R. Daido, J. M. Daugas, F. Didierjean, Y. Fang, N. Fukuda, B. Hong, E. Ideguchi, N. Inabe, T. Ishigaki, T. Isobe, H. S. Jung, D. Kameda, I. Kojouharov, T. Komatsubara, T. Kubo, Y. K. Kwon, C. S. Lee, P. Lee, S. Morimoto, D. Murai, M. Niikura, H. Nishibata, I. Nishizuka, H. Sakurai, Y. Shimizu, H. Suzuki, H. Takeda, K. Tshoo, and R. Yokoyama

Published
2023
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5. Identification of a millisecond isomeric state in Cd81129 via the detection of internal conversion and Compton electrons

Author

J. Taprogge, A. Jungclaus, H. Grawe, S. Nishimura, Z.Y. Xu, P. Doornenbal, G. Lorusso, E. Nácher, G.S. Simpson, P.-A. Söderström, T. Sumikama, H. Baba, F. Browne, N. Fukuda, R. Gernhäuser, G. Gey, N. Inabe, T. Isobe, H.S. Jung, D. Kameda, G.D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, Y.K. Kwon, Z. Li, H. Sakurai, H. Schaffner, K. Steiger, H. Suzuki, H. Takeda, Zs. Vajta, H. Watanabe, J. Wu, A. Yagi, K. Yoshinaga, G. Benzoni, S. Bönig, K.Y. Chae, L. Coraggio, A. Covello, J.-M. Daugas, F. Drouet, A. Gadea, A. Gargano, S. Ilieva, F.G. Kondev, T. Kröll, G.J. Lane, A. Montaner-Pizá, K. Moschner, D. Mücher, F. Naqvi, M. Niikura, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, Zs. Podolyák, and A. Wendt

Subjects
Physics, QC1-999
Abstract

The decay of an isomeric state in the neutron-rich nucleus 129Cd has been observed via the detection of internal conversion and Compton electrons providing first experimental information on excited states in this nucleus. The isomer was populated in the projectile fission of a 238U beam at the Radioactive Isotope Beam Factory at RIKEN. From the measured yields of γ-rays and internal conversion electrons, a multipolarity of E3 was tentatively assigned to the isomeric transition. A half-life of T1/2=3.6(2) ms was determined for the new state which was assigned a spin of (21/2+), based on a comparison to shell model calculations performed using state-of-the-art realistic effective interactions. Keywords: Isomeric decays, Transition strengths, Shell model calculations

Published
2014
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6. Various nuclear structures in Xe140 studied by β decay of ground and isomeric states in I140

Author

A. Yagi, A. Odahara, H. Nishibata, R. Lozeva, C.-B. Moon, S. Nishimura, K. Yoshida, N. Yoshinaga, C. Watanabe, K. Higashiyama, T. Shimoda, R. Daido, Y. Fang, P. S. Lee, B. Moon, P. Doornenbal, G. Lorusso, P.-A. Söderström, T. Sumikama, H. Watanabe, T. Isobe, H. Baba, H. Sakurai, F. Browne, Z. Patel, S. Rice, L. Sinclair, J. Wu, Z. Y. Xu, R. Yokoyama, T. Kubo, N. Inabe, H. Suzuki, N. Fukuda, D. Kameda, H. Takeda, D. S. Ahn, Y. Shimizu, D. Murai, F. L. Bello Garrote, J.-M. Daugas, F. Didierjean, E. Ideguchi, S. Iimura, T. Ishigaki, H. S. Jung, T. Komatsubara, Y. K. Kwon, C. S. Lee, S. Morimoto, M. Niikura, I. Nishizuka, and K. Tshoo

Published
2022
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7. First observation of the π0h11/2⊗ν0h9/2 partner orbital configuration in the odd-odd I138 nucleus

Author

B. Moon, A. Gargano, H. Naïdja, C.-B. Moon, A. Odahara, R. Lozeva, S. Nishimura, C. Yuan, F. Browne, P. Doornenbal, G. Lorusso, Z. Patel, S. Rice, M. Si, L. Sinclair, P.-A. Söderström, T. Sumikama, H. Watanabe, J. Wu, Z. Y. Xu, A. Yagi, D. S. Ahn, H. Baba, F. L. Bello Garrote, R. Daido, J. M. Daugas, F. Didierjean, Y. Fang, N. Fukuda, B. Hong, E. Ideguchi, N. Inabe, T. Ishigaki, T. Isobe, H. S. Jung, D. Kameda, I. Kojouharov, T. Komatsubara, T. Kubo, Y. K. Kwon, C. S. Lee, P. Lee, S. Morimoto, D. Murai, M. Niikura, H. Nishibata, I. Nishizuka, H. Sakurai, Y. Shimizu, H. Suzuki, H. Takeda, K. Tshoo, and R. Yokoyama

Published
2022
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8. Magnetic moment of the 11/2− isomeric state in Mo99 and neutron spin g factor quenching in A≈100 nuclei

Author

G. S. Simpson, O. Roig, B. Rossé, D. Bucurescu, D. L. Balabanski, P. H. Regan, L. Gaudefroy, V. Méot, K. A. Gladnishki, S. Kisyov, J. M. Daugas, P. Morel, Georgi Georgiev, and S. Pietri

Subjects
Physics, Quenching (fluorescence), Magnetic moment, 010308 nuclear & particles physics, g-factor, Parity (physics), 01 natural sciences, 7. Clean energy, medicine.anatomical_structure, Excited state, 0103 physical sciences, medicine, Neutron, Atomic physics, 010306 general physics, Spin (physics), Nucleus
Abstract

The gyromagnetic factor of the low-lying Ex=684.10(19)keV isomeric state of the nucleus 99Mo was measured using the time-dependent perturbed angular distribution technique. This level is assigned a spin and parity of Jπ=11/2−, with a half-life of T1/2=742(13)ns. The state of interest was populated and spin-aligned via a single-neutron transfer on a highly enriched 98Mo target. A magnetic moment μexpt.=−0.627(20)μN was obtained. This result is far from the Schmidt value expected for a pure single-particle νh11/2 state. A comparison of experimental spectroscopic properties of this nucleus is made with results of multishell Interacting boson-fermion Model (IBFM-1) calculations. In this approach, the Jπ=11/2− isomeric state in 99Mo has a pure νh11/2 configuration. Its magnetic moment, as well as that of other two excited states could be reasonably well reproduced by reducing the free neutron spin g factor with a quenching factor of 0.45. This low value is not appropriate only for this case, similar values for the quenching factor being also required in order to describe magnetic moments in other nuclei from the same mass region

Published
2021
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9. Nuclear structure of Te isotopes beyond neutron magic number N=82

Author

Y. Shimizu, Giuseppe Lorusso, F. L. Bello Garrote, I. Nishizuka, T. Isobe, Chang-Bum Moon, A. Jungclaus, S. Morimoto, Naohito Inabe, Y. F. Fang, Zs. Vajta, Hiroshi Watanabe, Roman Gernhäuser, C. S. Lee, Hiroshi Suzuki, Toshiyuki Sumikama, Shunji Nishimura, H. Schaffner, M. Si, D. Mücher, Hiroyuki Takeda, Daichi Murai, F. Browne, Hiroki Nishibata, Atsuko Odahara, Anna Wendt, J. M. Daugas, Guillaume Gey, L. Sinclair, Hiroyoshi Sakurai, I. Kojouharov, P. A. Söderström, Ayumi Yagi, S. Bönig, Byung-Sik Hong, Gary Simpson, R. Orlandi, Younghun Kwon, A. Montaner-Pizá, Stephen Rice, D. Kameda, J. M. Keatings, Eiji Ideguchi, Rin Yokoyama, K. Moschner, A. Gargano, S. Ilieva, Jan Taprogge, K. Yoshinaga, Hyo Soon Jung, B. Moon, R. Daido, Zena Patel, D. S. Ahn, P. Doornenbal, Jin Wu, H. Naïdja, K. Tshoo, N. Kurz, K. Steiger, Naoki Fukuda, Megumi Niikura, P. Lee, F. Didierjean, Tetsuro Komatsubara, Toshiyuki Kubo, T. Kröll, R. Lozeva, F. Drouet, Z. H. Li, H. Baba, Zhengyu Xu, T. Ishigaki, RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Institute for Basic Science (South Korea), National Research Foundation of Korea, Ministerio de Economía y Competitividad (España), Japan Society for the Promotion of Science, National Research, Development and Innovation Office (Hungary), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), ILL, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and 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)

Subjects
Physics, Isotope, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Nuclear Theory, Nuclear structure, Nuclear Structure, 7. Clean energy, 01 natural sciences, Nuclear physics, Fragmentation (mass spectrometry), Excited state, 0103 physical sciences, Neutron, 010306 general physics, Nucleon, Nuclear Experiment, Beam (structure), Magic number (physics)
Abstract

15 pags., 10 figs., 4 tabs., Newly observed decay schemes of the nuclei Sb137 and Sb138 are reported. The neutron-rich Sb isotopes were produced by the in-flight fragmentation of a U238 primary beam with an energy of 345 MeV/nucleon. Several new excited states of Te137 with tentatively assigned spin-parities of (5/2-), (9/2-), and (7/2) have been established which play an important role in the evolution of neutron levels beyond N=82. The study of the ß decay of Sb138 led to a considerable extension of the level scheme of Te138 including the identification of several nonyrast states. The structure of Te137 and Te138 is discussed on the basis of large-scale shell-model calculations performed using two different effective interactions., This work was carried out at the RIBF operated by RIKEN Nishina Center and CNS, University of Tokyo. Part of the WAS3ABi was supported by the Rare Isotope Science Project (RISP) of the Institute for Basic Science (IBS) funded by the Ministry of Science, ICT and Future Planning (MSIP) and National Research Foundation (NRF) of the Republic of Korea (Grant No. 2013M7A1A1075764). This research was supported by NRF of the Republic of Korea (Grants No. 2019R1A6A3A03031564 and No. 2018R1A5A1025563), IBS of the Republic of Korea (Grants No. IBS-R031-D1 and No. IBS-R031-Y1), the Spanish Ministerio de Economía y Competitividad (Grant No. FPA2017-84756-C4-2-P), and JSPS KAKENHI of Japan (Grant No. 25247045). The support from FR-JP LIA is also acknowledged. C.S.L. acknowledges the support from NRF of the Republic of Korea (Grants No. 2017M2A2A6A02071071 and No. 2016R1D1A1A09917463). Z.V. acknowledges the supports from the National Research, Development and Innovation Fund of Hungary, financed under the K18 funding scheme with Project No. K128947 and by the European Regional Development Fund (Grant No. GINOP-2.3.3-15-2016- 00034), as well as by the National Research, Development and Innovation Office NKFIH (Grant No. PD 124717).

Published
2021
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10. Evolution of proton single-particle states in neutron-rich Sb isotopes beyond N=82

Author

A. Jungclaus, Y. Shimizu, H. Schaffner, Hiroshi Suzuki, T. Isobe, I. Kojouharov, Hiroshi Watanabe, G. D. Kim, J. M. Daugas, Hiroki Nishibata, Jinguang Wu, Hiroyoshi Sakurai, D. Kameda, Toshiyuki Kubo, Shunji Nishimura, A. Gargano, Gary Simpson, P. Doornenbal, Atsuko Odahara, H. Baba, K. Moschner, Roman Gernhäuser, F. Browne, Z. H. Li, Z Vajta, Ayumi Yagi, Naohito Inabe, S. Bönig, Marcus Scheck, Guillaume Gey, T. Kröll, K. Yoshinaga, S. Ilieva, N. Kurz, Jan Taprogge, Naoki Fukuda, K. Steiger, Hyo Soon Jung, R. Orlandi, J. M. Keatings, Young-Ki Kim, P. A. Söderström, Younghun Kwon, A. Montaner-Pizá, Giuseppe Lorusso, Anna Wendt, D. Mücher, Toshiyuki Sumikama, Hiroyuki Takeda, H. Naïdja, Zhengyu Xu, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), ILL, RIKEN Nishina Center for Accelerator-Based Science, Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), and National Research, Development and Innovation Office (Hungary)

Subjects
Physics, Proton, Isotope, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure, 7. Clean energy, 01 natural sciences, Beta decay, Nuclear physics, Neutron number, Excited state, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Excitation
Abstract

11 pags., 8 figs., 2 tabs., The β decay of the semimagic Sn isotopes Sn136,137,138 has been studied at the Radioactive Isotope Beam Factory at the RIKEN Nishina Center. The first experimental information on excited states was obtained for Sb137 while, in the case of Sb136, the established excitation scheme could be extended by ten previously unidentified levels. In the decay of the most-neutron-rich isotope Sn138, two γ rays were observed for the first time. The new experimental results, in combination with state-of-the-art shell-model calculations, provide the first information with respect to the evolution of the 0g7/2 and 1d5/2 proton single-particle states with increasing neutron number beyond N=84., We thank the staff of the RIKEN Nishina Center accelerator complex for providing high-intensity beams to the experiment. This work was supported by the Spanish Ministerio de Ciencia e Innovación under contracts FPA2014-57196-C5-4-P and FPA2017-84756-C4-2-P and the UK Science and Technology Facilities Council under Grant No. ST/P005101/1. Zs.V. was supported by the European Regional Development Fund (Contract No. GINOP-2.3.3- 15-2016-00034), the National Research Development and Innovation Fund of Hungary (Grant No. K128947), and by RIKEN as short-term International Program Associate.

Published
2020
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11. β -decay half-lives of 55 neutron-rich isotopes beyond the N=82 shell gap

Author

Hiroyoshi Sakurai, Trevor M. Sprouse, Atsuko Odahara, J. M. Daugas, Hiroki Nishibata, R. Daido, B. Moon, Shunji Nishimura, L. Sinclair, Y. F. Fang, Y. Wakabayashi, Ayumi Yagi, Toshiyuki Sumikama, Matthew Mumpower, I. Kojouharov, Rin Yokoyama, P. A. Söderström, D. Kameda, Hiroyuki Takeda, Stephen Rice, K. Y. Kwon, M. Haroon, D. S. Ahn, R. Lozeva, Giuseppe Lorusso, Zena Patel, Daichi Murai, Peter Möller, H. Baba, T. Ishigaki, P. Doornenbal, F. L. Bello Garrote, N. Kurz, Jin Wu, K. Tshoo, Hirofumi Watanabe, Y. Shimizu, Chang-Bum Moon, Naoki Fukuda, Hyo Soon Jung, F. Didierjean, Tetsuro Komatsubara, F. Browne, Toshiyuki Kubo, Hiroshi Suzuki, S. Morimoto, Naohito Inabe, T. Isobe, H. Schaffner, Zhengyu Xu, and Momoko Tanaka

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Fission, Shell (structure), Context (language use), 01 natural sciences, 7. Clean energy, Nuclear physics, 13. Climate action, Nucleosynthesis, 0103 physical sciences, Level structure, Neutron, 010306 general physics, Beam (structure)
Abstract

The $\beta$-decay half-lives of 55 neutron-rich nuclei $^{134-139}$Sn, $^{134-142}$Sb, $^{137-144}$Te, $^{140-146}$I, $^{142-148}$Xe, $^{145-151}$Cs, $^{148-153}$Ba, $^{151-155}$La were measured at the Radioactive Isotope Beam Factory (RIBF) employing the projectile fission fragments of $^{238}$U. The nuclear level structure, which relates to deformation, has a large effect on the half-lives. The impact of newly-measured half-lives on modeling the astrophysical origin of the heavy elements is studied in the context of $r$ process nucleosynthesis. For a wide variety of astrophysical conditions, including those in which fission recycling occurs, the half-lives have an important local impact on the second ($A$ $\approx$ 130) peak.

Published
2020
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12. g Factor of the Zr99 ( 7/2+ ) Isomer: Monopole Evolution in the Shape-Coexisting Region

Author

Naoki Fukuda, T. Nishizaka, Georgi Georgiev, Ish Mukul, Megumi Niikura, W. Kim, D. L. Balabanski, A. Kusoglu, Yoji Kobayashi, Koichiro Asahi, Hiroki Nishibata, T. Egami, DeukSoon Ahn, S. Kisyov, Yuichi Ohtomo, Yoko Ishibashi, Hiroshi Suzuki, K. Imamura, Gary Simpson, T. Kawaguchi, L. C. Tao, T. Fujita, Satoru Momiyama, Michael Hass, A. Gladkov, C. Funayama, Atsuko Odahara, Takuso Sato, Takashi Kawamura, Naohito Inabe, J. M. Daugas, R. Lozeva, F. Boulay, Hiroaki Ueno, Shuichiro Kojima, D. Ralet, Takeshi Furukawa, Toshiyuki Sumikama, Y. Shimizu, H. Yamazaki, D. Tominaga, Yasuhiro Togano, H. Baba, Yuichi Ichikawa, Xiaofei Yang, A. Takamine, D. Bucurescu, and H. Takeda

Subjects
Physics, Angular distribution, medicine.anatomical_structure, Magnetic moment, 0103 physical sciences, Magnetic monopole, medicine, General Physics and Astronomy, Parity (physics), Atomic physics, 010306 general physics, 01 natural sciences, Nucleus
Abstract

The gyromagnetic factor of the low-lying E=251.96(9) keV isomeric state of the nucleus ^{99}Zr was measured using the time-dependent perturbed angular distribution technique. This level is assigned a spin and parity of J^{π}=7/2^{+}, with a half-life of T_{1/2}=336(5) ns. The isomer was produced and spin aligned via the abrasion-fission of a ^{238}U primary beam at RIKEN RIBF. A magnetic moment |μ|=2.31(14)μ_{N} was deduced showing that this isomer is not single particle in nature. A comparison of the experimental values with interacting boson-fermion model IBFM-1 results shows that this state is strongly mixed with a main νd_{5/2} composition. Furthermore, it was found that monopole single-particle evolution changes significantly with the appearance of collective modes, likely due to type-II shell evolution.

Published
2020
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13. Normal and intruder configurations in Si34 populated in the β− decay of Mg34 and Al34

Author

Ph. Dessagne, Alin Titus Serban, J. Mrazek, J. Pakarinen, V. F. E. Pucknell, O. Sorlin, F. Negoita, P. Morfouace, Carmen Gheorghe, P. Rahkila, E. Rapisarda, C. Sotty, J. Konki, C. Borcea, Olof Tengblad, S. Franchoo, A. N. Andreyev, Ph Morel, A. Turturica, Paul Greenlees, H. M. Lazarus, F. Nowacki, S. Kisyov, A. Poves, M. Stanoiu, R. Mărginean, S. Grévy, R. E. Mihai, L. M. Fraile, Cosmin Teodor Mihai, J. M. Daugas, Thierry Stora, A. Ionescu, A. Negret, M. J. G. Borge, N. Marginean, L. Stan, S. Calinescu, R. Lica, R. Borcea, C. Costache, H. De Witte, István Kuti, Marc Huyse, D. M. Filipescu, R. D. Page, M. Madurga, P. Van Duppen, N. Warr, and F. Rotaru

Subjects
Physics, 010308 nuclear & particles physics, Neutron emission, 0103 physical sciences, SHELL model, Nuclear structure, Atomic physics, 010306 general physics, Spectroscopy, 01 natural sciences
Abstract

The structure of $^{34}$Si was studied through $\gamma$ spectroscopy separately in the $\beta^-$ decays of $^{34}$Mg and $^{34}$Al at the ISOLDE facility of CERN. Different configurations in $^{34}$Si were populated independently from the two recently identified $\beta$-decaying states in $^{34}$Al having spin-parity assignments $J^\pi = 4^-$ dominated by the normal configuration $\pi (d_{5/2})^{-1} \otimes \nu (f_{7/2})$ and $J^\pi = 1^+$ by the intruder configuration $\pi (d_{5/2})^{-1} \otimes \nu (d_{3/2})^{-1}(f_{7/2})^{2}$. The paper reports on spectroscopic properties of $^{34}$Si such as an extended level scheme, spin and parity assignments based on log($ft$) values and $\gamma$-ray branching ratios, absolute $\beta$ feeding intensities and neutron emission probabilities. A total of 11 newly identified levels and 26 transitions were added to the previously known level scheme of $^{34}$Si. Large scale shell-model calculations using the {\sc sdpf-u-mix} interaction, able to treat higher order intruder configurations, are compared with the new results and conclusions are drawn concerning the predictive power of {\sc sdpf-u-mix}, the $N=20$ shell gap, the level of mixing between normal and intruder configurations for the 0$_1^+$, 0$_2^+$ and 2$_1^+$ states and the absence of triaxial deformation in $^{34}$Si.

Published
2019
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14. Interplay between nuclear shell evolution and shape deformation revealed by the magnetic moment of $^{75}$Cu

Author

Y. Ichikawa, H. Nishibata, Y. Tsunoda, A. Takamine, K. Imamura, T. Fujita, T. Sato, S. Momiyama, Y. Shimizu, D. S. Ahn, K. Asahi, H. Baba, D. L. Balabanski, F. Boulay, J. M. Daugas, T. Egami, N. Fukuda, C. Funayama, T. Furukawa, G. Georgiev, A. Gladkov, N. Inabe, Y. Ishibashi, T. Kawaguchi, T. Kawamura, Y. Kobayashi, S. Kojima, A. Kusoglu, I. Mukul, M. Niikura, T. Nishizaka, A. Odahara, Y. Ohtomo, T. Otsuka, D. Ralet, G. S. Simpson, T. Sumikama, H. Suzuki, H. Takeda, L. C. Tao, Y. Togano, D. Tominaga, H. Ueno, H. Yamazaki, X. F. Yang, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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)-Université Grenoble Alpes (UGA), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

Subjects
Physics, Magnetic moment, Nuclear Theory, Shell (structure), General Physics and Astronomy, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Molecular physics, 010305 fluids & plasmas, medicine.anatomical_structure, Nucleosynthesis, 0103 physical sciences, medicine, Nuclear force, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nucleon, Spin (physics), Nuclear Experiment, Nucleus
Abstract

Exotic nuclei are characterized by a number of neutrons (or protons) in excess relative to stable nuclei. Their shell structure, which represents single-particle motion in a nucleus, may vary due to nuclear force and excess neutrons, in a phenomenon called shell evolution. This effect could be counterbalanced by collective modes causing deformations of the nuclear surface. Here, we study the interplay between shell evolution and shape deformation by focusing on the magnetic moment of an isomeric state of the neutron-rich nucleus 75Cu. We measure the magnetic moment using highly spin-controlled rare-isotope beams and achieving large spin alignment via a two-step reaction scheme that incorporates an angular-momentum-selecting nucleon removal. By combining our experiments with numerical simulations of many-fermion correlations, we find that the low-lying states in 75Cu are, to a large extent, of single-particle nature on top of a correlated 74Ni core. We elucidate the crucial role of shell evolution even in the presence of the collective mode, and within the same framework, we consider whether and how the double magicity of the 78Ni nucleus is restored, which is also of keen interest from the perspective of nucleosynthesis in explosive stellar processes., 10 pages, 4 figures

Published
2019
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15. Nuclear moments of the low-lying isomeric 1(+) state of Al-34: Investigation on the neutron 1p1h excitation across N=20 in the island of inversion

Author

Takaharu Otsuka, W. Gins, M. Lykiardopoulou, O. Kamalou, T. Sato, T. J. Mertzimekis, J. C. Thomas, R. Orset, Marine Vandebrouck, Koichiro Asahi, Xiaofei Yang, Yutaka Utsuno, R. P. de Groote, Alfredo Poves, H. Heylen, Gerda Neyens, C. Stodel, Naofumi Tsunoda, J. M. Daugas, Hiroki Nishibata, F. Boulay, Ziye Xu, Á. Koszorús, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
β-NMR/NQR, Nuclear reaction, Nuclear and High Energy Physics, beta-NMR/NQR, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Astronomy & Astrophysics, 01 natural sciences, INELASTIC-SCATTERING, Quadrupole moment, Physics, Particles & Fields, g factor, DEFORMATION, [formula omitted]Al, 0103 physical sciences, Nuclear Physics - Experiment, Neutron, β -NMR/NQR, 010306 general physics, Nuclear Experiment, ELECTRIC QUADRUPOLE-MOMENT, Physics, Science & Technology, STABILITY, 010308 nuclear & particles physics, Island of inversion, 34m Al, Resonance, SHELL CLOSURE, lcsh:QC1-999, MAGNETIC-MOMENTS, Physics, Nuclear, SPIN, GROUND-STATE, Quadrupole, Physical Sciences, COLLECTIVITY, Al-34m, Atomic physics, Nucleon, Isotopes of beryllium, lcsh:Physics, Dimensionless quantity
Abstract

The nuclear g factor and quadrupole moment ( Q s ) have been measured for the low-lying isomeric 1 + state of 34Al, using the β-detected nuclear magnetic resonance (β-NMR) and quadrupole resonance (β-NQR) methods. Spin-polarized 34Al isotopes were produced in a one-neutron pickup reaction induced by a 36S beam on a 9Be target at a kinetic energy of 77.5 MeV/nucleon, and were collected with the LISE fragment separator at GANIL. The measured g factor ( | g | in a range of 1.757 ± 0.014 ) and quadrupole moment ( | Q s | = 38 ( 5 ) mb) are in good agreement with shell-model calculations using effective interactions. The similarity between the g factor of 34 m Al and that of 32Al confirms a dominant neutron 2 p 1 h configuration π ( d 5 / 2 ) − 1 ⊗ ν ( d 3 / 2 ) − 1 ( f 7 / 2 ) 2 of 34 m Al. In addition, the enhanced quadrupole moment of 34 m Al relative to that of 32Al suggests that the neutron 1 p 1 h excitation across the N = 20 shell gap introduces extra nucleon–nucleon correlation and deformation.

Published
2018
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16. Corrigendum to: 'Shape dynamics in neutron-rich Kr isotopes: Coulomb excitation of 92Kr, 94Kr and 96Kr' [Nucl. Phys. A 899 (2013) 1–28]

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Isotope, 0103 physical sciences, Neutron, Coulomb excitation, 010306 general physics, Shape dynamics, 01 natural sciences
Published
2016
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17. β-decay scheme ofTe140toI140: Suppression of Gamow-Teller transitions between the neutronh9/2and protonh11/2partner orbitals

Author

Shin-Ichiro Nishimura, Chang-Bum Moon, Y. Shimizu, J. M. Daugas, F. Browne, R. Lozeva, B. Moon, Hiroshi Watanabe, K. Tshoo, Tetsuro Komatsubara, Daichi Murai, Zena Patel, H. Baba, I. Kojouharov, Rin Yokoyama, T. Ishigaki, Giuseppe Lorusso, F. L. Bello Garrote, I. Nishizuka, Takashi Kubo, Cenxi Yuan, H. Takeda, Naoki Fukuda, Megumi Niikura, Stephen Rice, Toshiyuki Sumikama, Hyo Soon Jung, Ayumi Yagi, P. A. Söderström, Jin Wu, Y. K. Kwon, Byung-Sik Hong, D. Kameda, T. Isobe, L. Sinclair, S. Morimoto, Naohito Inabe, P. Doornenbal, Eiji Ideguchi, D. S. Ahn, Hiroki Nishibata, Zhengyu Xu, Y. F. Fang, P. Lee, R. Daido, Hiroshi Suzuki, C. S. Lee, Atsuko Odahara, Hiroyoshi Sakurai, and F. Didierjean

Subjects
Physics, Decay scheme, 010308 nuclear & particles physics, Fission, 01 natural sciences, Beta decay, Nuclear physics, Atomic orbital, Isospin, 0103 physical sciences, Neutron, Nuclide, Atomic physics, 010306 general physics, Nucleon
Abstract

We report for the first time the β-decay scheme of Te140 (Z=52) to I140 (Z=53), with a specific focus on the Gamow-Teller strength along N=87 isotones. These results were obtained in an experiment performed at the Radioactive Ion Beam Factory (RIBF), RIKEN, where the parent nuclide, Te140, was produced through the in-flight fission of a U238 beam at 345 MeV per nucleon impinging on a Be9 target. Based on data from the high-efficiency γ-ray spectrometer, EUROBALL-RIKEN Cluster Array (EURICA), we constructed a decay scheme of I140. The half-life of Te140 has been determined to be 350(5) ms. A level at 926 keV has been assigned as a (1+) state based on the logft value of 4.89(6). This (1+) state, commonly observed in odd-odd nuclei, can be interpreted in terms of the πh11/2νh9/2 configuration formed by the Gamow-Teller transition between a neutron in the h9/2 orbital and a proton in the h11/2 orbital. We observe a sharp contrast to this type of β-decay branching to the lower-lying 1+ states between I140 and I136, where we see a large reduction as the number of neutrons increases. This is in contrast to the prediction by large-scale shell model calculations. To investigate this type of the suppression, results of the Nilsson model calculations will be discussed. Along the isotones with N=87, we discuss a characteristic feature of the Gamow-Teller distributions at 1+ states with respect to the isospin difference.

Published
2017
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18. Nuclear structure and β -decay schemes for Te nuclides beyond N=82

Author

Rin Yokoyama, T. Isobe, Hiroshi Watanabe, Hyo Soon Jung, Eiji Ideguchi, S. Morimoto, F. Browne, B. Moon, Naohito Inabe, Daichi Murai, I. Kojouharov, Naoki Fukuda, D. Kameda, Zhengyu Xu, Toshiyuki Sumikama, Megumi Niikura, Y. F. Fang, J. M. Daugas, P. A. Söderström, Hiroyoshi Sakurai, P. Doornenbal, Chang-Bum Moon, Byungsik Hong, Y. Shimizu, R. Daido, Tetsuro Komatsubara, Hiroshi Suzuki, K. Tshoo, H. Baba, Toshiyuki Kubo, T. Ishigaki, C. S. Lee, F. Didierjean, Atsuko Odahara, Zena Patel, R. Lozeva, D. S. Ahn, L. Sinclair, Hiroki Nishibata, Stephen Rice, Giuseppe Lorusso, Cenxi Yuan, Jin Wu, H. Takeda, P. Lee, Shunji Nishimura, Y. K. Kwon, Ayumi Yagi, F. L. Bello Garrote, and I. Nishizuka

Subjects
Physics, Radionuclide, Isotope, 010308 nuclear & particles physics, Fission, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Nuclear structure, 01 natural sciences, 3. Good health, Nuclear physics, Excited state, 0103 physical sciences, Neutron, Nuclide, Nuclear Experiment, 010306 general physics, Spectroscopy
Abstract

We study for the first time the internal structure of Te140 through the β-delayed γ-ray spectroscopy of Sb140. The very neutron-rich Sb140 nuclei with Z=51 and N=89 were produced by the in-flight fission of U238 beams at the Radioactive Isotope Beam Factory, RIKEN. The half-life and spin-parity of Sb140 are reported as 173±12 ms and 3−, respectively. In addition to the excited states of Te140 produced by the β-decay branch, the β-delayed one-neutron and two-neutron emission branches were also established. By identifying the first 2+ and 4+ excited states of Te140, we found that Te isotopes persist in their vibrator character with E(4+)/E(2+)=2. We discuss the distinctive features manifest in this region revealed in pairs of isotopes with the same neutron holes and particles with respect to N=82.

Published
2017
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19. Observation of a $\gamma$-decaying millisecond isomeric state in $^{128}$Cd$_{80}$

Author

I. Kojouharov, Jan Taprogge, S. Ilieva, K. Moschner, A. Gargano, Hyo Soon Jung, Zhengyu Xu, P. A. Söderström, L. Coraggio, F. Naqvi, Ayumi Yagi, G. Benzoni, S. Bönig, Shunji Nishimura, Toshiyuki Sumikama, K. Yoshinaga, Zs. Vajta, Zena Patel, A. Jungclaus, Hiroyoshi Sakurai, Z. H. Li, G. D. Kim, F. Drouet, H. Grawe, N. Kurz, Hiroyuki Takeda, Young-Ki Kim, J. M. Daugas, T. Kröll, Younghun Kwon, F. Browne, G. J. Lane, Giuseppe Lorusso, A. Montaner-Pizá, R. Orlandi, H. Baba, H. Schaffner, Hiroshi Suzuki, Megumi Niikura, Nunzio Itaco, T. Isobe, D. Kameda, D. Mücher, Atsuko Odahara, F. G. Kondev, Guillaume Gey, Naoki Fukuda, P. Doornenbal, Hiroshi Watanabe, Zs. Podolyák, Jin Wu, K. Steiger, Hiroki Nishibata, Anna Wendt, K. Y. Chae, Naohito Inabe, Y. Shimizu, Gary Simpson, Toshiyuki Kubo, A. Gadea, Roman Gernhäuser, 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)-Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), ILL, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Hungarian Scientific Research Fund, European Commission, Department of Energy (US), Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), Helmholtz International Center for FAIR, German Research Foundation, SCOAP, National Research Foundation of Korea, Generalitat Valenciana, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), RIKEN Nishina Center for Accelerator-Based Science, Japan Society for the Promotion of Science, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Jungclaus, A., Grawe, H., Nishimura, S., Doornenbal, P., Lorusso, G., Simpson, G. S., Sã¶derstrã¶m, P. -. A., Sumikama, T., Taprogge, J., Xu, Z. Y., Baba, H., Browne, F., Fukuda, N., Gernhã¤user, R., Gey, G., Inabe, N., Isobe, T., Jung, H. S., Kameda, D., Kim, G. D., Kim, Y. -. K., Kojouharov, I., Kubo, T., Kurz, N., Kwon, Y. K., Li, Z., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Vajta, Z. S., Watanabe, H., Wu, J., Yagi, A., Yoshinaga, K., Benzoni, G., Bã¶nig, S., Chae, K. Y., Coraggio, L., Daugas, J. -. M., Drouet, F., Gadea, A., Gargano, A., Ilieva, S., Itaco, N., Kondev, F. G., Krã¶ll, T., Lane, G. J., Montaner-pizã¡, A., Moschner, K., Mã¼cher, D., Naqvi, F., Niikura, M., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Podolyã¡k, Z. S., and Wendt, A.

Subjects
Shell model calculation, Nuclear and High Energy Physics, Fission, SHELL model, Nuclear Theory, Shell model calculations, Transition strengths, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, 0103 physical sciences, medicine, ddc:530, 010306 general physics, Nuclear Experiment, Physics, Millisecond, Radionuclide, Isomeric decay, 010308 nuclear & particles physics, Projectile, Parity (physics), lcsh:QC1-999, medicine.anatomical_structure, Isomeric decays, Physics::Accelerator Physics, Transition strength, Atomic physics, Nucleus, lcsh:Physics
Abstract

A. Jungclaus et al. -- 6 pags., 5 figs., 2 tabs. -- Open Access funded by Creative Commons Atribution Licence 4.0, A new high-spin isomer in the neutron-rich nucleus Cd was populated in the projectile fission of a U beam at the Radioactive Isotope Beam Factory at RIKEN. A half-life of T=6.3(8) ms was measured for the new state which was tentatively assigned a spin/parity of (15). The experimental results are compared to shell model calculations performed using state-of-the-art realistic effective interactions and to the neighbouring nucleus Cd. In the present experiment no evidence was found for the decay of a 18 E6 spin-trap isomer, based on the complete alignment of the two-neutron and two-proton holes in the 0h and the 0g orbit, respectively, which is predicted to exist by the shell model., We thank the staff of the RIKEN Nishina Center accelerator complex for providing stable beams with high intensities to the experiment. We acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors. This work was supported by the Spanish Ministerio de Ciencia e Innovación under contract FPA2011-29854-C04 and the Spanish Ministerio de Economía y Competitividad under contract FPA2014-57196-C5-4-P, the Generalitat Valenciana (Spain) under grant PROMETEO/2010/101, the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (NRF-2014S1A2A2028636, 2016K1A3A7A09005579, 2016R1A5A1013277), the Priority Centers Research Program in Korea (2009-0093817), OTKA contract number K-100835, JSPS KAKENHI (Grant No. 25247045), the European Commission through the Marie Curie Actions call FP7-PEOPLE-2011-IEF under Contract No. 300096, the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357, the STFC (UK), the “RIKEN foreign research program”, the German BMBF (No. 05P12RDCIA, 05P12RDNUP and 05P12PKFNE), HIC for FAIR, the DFG cluster of excellence “Origin and Structure of the Universe” and DFG (Contract No. KR2326/2-1).

Published
2017
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20. Identification of a millisecond isomeric state inCd81129via the detection of internal conversion and Compton electrons

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Millisecond, Fission, Nuclear Theory, Electron, Nuclear isomer, 7. Clean energy, Internal conversion, Excited state, Atomic physics, Nuclear Experiment, Spin (physics), Beam (structure)
Abstract

The decay of an isomeric state in the neutron-rich nucleus 129 Cd has been observed via the detection of internal conversion and Compton electrons providing first experimental information on excited states in this nucleus. The isomer was populated in the projectile fission of a 238 U beam at the Radioactive Isotope Beam Factory at RIKEN. From the measured yields of γ -rays and internal conversion electrons, a multipolarity of E 3 was tentatively assigned to the isomeric transition. A half-life of T 1 / 2 = 3.6 ( 2 ) ms was determined for the new state which was assigned a spin of ( 21 / 2 + ) , based on a comparison to shell model calculations performed using state-of-the-art realistic effective interactions.

Published
2014
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21. Erratum to: Proton-hole and core-excited states in the semi-magic nucleus 131In82

Author

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

Subjects
Core (optical fiber), Physics, Nuclear and High Energy Physics, medicine.anatomical_structure, Proton, Excited state, Hadron, medicine, Nuclear fusion, MAGIC (telescope), Atomic physics, Nucleus
Published
2016
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22. Novel method for the production of spin-aligned RI beams in projectile fragmentation with the dispersion matching technique

Author

N. Aoi, Hideki Ueno, R. Chevrier, Hiroshi Watanabe, Takeshi Furukawa, Tetsuya Ohnishi, Y. Ishii, Daisuke Kameda, Masato Tsuchiya, G. Georgiev, H. Takeda, H. Iijima, T. Kubo, Tsubasa Nanao, H. Hayashi, N. Inabe, J. M. Daugas, Masayasu Ishihara, Dimiter L. Balabanski, M. Rajabali, T. Inoue, Akihiro Yoshimi, Koichiro Asahi, Yuichi Ichikawa, Naoki Fukuda, K. Suzuki, 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, Nuclear and High Energy Physics, Matching (graph theory), 010308 nuclear & particles physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Present method, Dispersion (optics), 0103 physical sciences, Nuclear spin, Figure of merit, Physics::Accelerator Physics, spin-aligned RI beams, Nuclear moment, projectile fragment, Physical and Theoretical Chemistry, Atomic physics, Spin (physics), 010306 general physics, Nuclear Experiment, RI beam, Projectile fragmentation, Beam (structure)
Abstract

A novel method to produce spin-aligned rare-isotope (RI) beam has been developed, that is the two-step projectile fragmentation method with a technique of dispersion matching. The present method was verified 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, with 33Al as an intermediate nucleus. Figure of merit of the present method was found to be improved by a factor larger than 50 compared with a conventional method employing single-step projectile fragmentation. ispartof: pages:47-51 ispartof: Hyperfine Interactions vol:220 issue:1 pages:47-51 ispartof: 4th Joint International Conference on Hyperfine Interactions / International Symposium on Nuclear Quadrupole Interactions (HFI/NQI) location:Beijing, China date:10 Sep - 14 Sep 2012 status: published

Published
2013
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23. High-precision quadrupole moment reveals significant intruder component inAl201333ground state

Author

P. Morel, Akihiro Yoshimi, Yoko Ishibashi, Mustafa Rajabali, T. J. Mertzimekis, Alfredo Poves, Yuichi Ichikawa, H. Heylen, L. Caceres, Yutaka Utsuno, Gerda Neyens, Naohiro Yoshida, J. Papuga, J. C. Thomas, Mark Bissell, R. Chevrier, O. Kamalou, Hideki Ueno, M. De Rydt, J. M. Daugas, and C. Stodel

Subjects
Physics, Coupling constant, 010308 nuclear & particles physics, Island of inversion, Nuclear Theory, 01 natural sciences, 0103 physical sciences, Quadrupole, Atomic physics, 010306 general physics, Ground state, Nuclear quadrupole resonance, Wave function, Electric field gradient, Excitation
Abstract

The electric quadrupole moment of the $_{13}^{33}\mathrm{Al}_{20}$ ground state, located at the border of the island of inversion, was obtained using continuous-beam $\ensuremath{\beta}$-detected nuclear quadrupole resonance ($\ensuremath{\beta}$-NQR). From the measured quadrupole coupling constant ${\ensuremath{\nu}}_{Q}=2.31(4)$ MHz in an $\ensuremath{\alpha}\ensuremath{-}{\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ crystal, a precise value for the electric quadrupole moment is extracted: $\left|{Q}_{s}\left(^{33}\mathrm{Al}\right)\right|=141(3)$ mb. A comparison with large-scale shell model calculations shows that $^{33}\mathrm{Al}$ has at least 50% intruder configurations in the ground state wave function, favoring the excitation of two neutrons across the $N=20$ shell gap. $^{33}\mathrm{Al}$ therefore clearly marks the gradual transition north of the deformed Na and Mg nuclei towards the normal $Z\ensuremath{\ge}14$ isotopes.

Published
2016
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24. Nearly degenerate isomeric states ofCu75

Author

M. Stanoiu, L. Gaudefroy, R. Borcea, O. Sorlin, O. Kamalou, C. Plaisir, S. Calinescu, F. Rotaru, C. Petrone, C. Borcea, T. Faul, G. Gey, J. C. Thomas, G. S. Simpson, L. Caceres, R. Chevrier, J. M. Daugas, F. Negoita, and G. Georgiev

Subjects
Physics, Valence (chemistry), 010308 nuclear & particles physics, 0103 physical sciences, Degenerate energy levels, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy, 01 natural sciences
Abstract

The decays of two isomeric states in the neutron-rich nucleus $^{75}\mathrm{Cu}$ have been studied via delayed $\ensuremath{\gamma}$-ray spectroscopy. These states were populated by the fragmentation of a $60.4\phantom{\rule{4pt}{0ex}}A\phantom{\rule{0.16em}{0ex}}\mathrm{MeV} ^{86}\mathrm{Kr}$ primary beam, which impinged on a Be target at the LISE2k spectrometer of GANIL. Isomeric half-lives and branching ratios were measured, and a $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ coincidence analysis performed. These have allowed a revised level scheme of $^{75}\mathrm{Cu}$ to be proposed. A comparison with large-scale shell-model calculations using different effective interactions and valence spaces shows the importance of proton excitations across the $Z=28$ shell gap for reproducing the energy spacing between the isomeric states. The coexisting collective and single-particle properties of the $(1/{2}^{\ensuremath{-}})$ and $(3/{2}^{\ensuremath{-}})$ states, respectively, are similar to those of the same states in the neighboring $^{69,71,73}\mathrm{Cu}$. The small energy spacings between the $(1/{2}^{\ensuremath{-}}), (3/{2}^{\ensuremath{-}})$, and $5/{2}^{\ensuremath{-}}$ states are responsible for the isomerism.

Published
2016
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25. Magnetic moment of the13/2+isomeric state inCu69: Spin alignment in the one-nucleon removal reaction

Author

Hiroki Nishibata, Yuichi Ichikawa, Alain Goasduff, H. Miyatake, M. Bostan, Hazuki Shirai, Y. Saito, Y. Ishii, Georgi P. Georgiev, D. Nagae, Tsubasa Nanao, Masatoshi Chikamori, Deyan T. Yordanov, R. Chevrier, Megumi Niikura, A. Kusoglu, Hideki Ueno, Yasushi Abe, R. Lozeva, Takeshi Furukawa, Susumu Okada, T. Niwa, Naohiro Yoshida, J. M. Daugas, Yoko Ishibashi, D. L. Balabanski, A. Ozawa, Koichiro Asahi, and C. Sotty

Subjects
Physics, Magnetic moment, 010308 nuclear & particles physics, g factor, SHELL model, 7. Clean energy, 01 natural sciences, Angular distribution, medicine.anatomical_structure, Fragmentation (mass spectrometry), 0103 physical sciences, medicine, Atomic physics, 010306 general physics, Spin (physics), Nucleon, Nucleus
Abstract

We report on a new measurement of the g factor of the (13/2(+)) isomeric state in the neutron-rich nucleus Cu-69. This study demonstrates the possibility of obtaining considerable nuclear spin alignment for multi-quasiparticle states in single-nucleon removal reactions. The time-dependent perturbed angular distribution (TDPAD) method was used to extract the gyromagnetic factor of the (13/2(+)) [T-1/2 = 351(14) ns] isomeric state of Cu-69. Its g factor was obtained as g(13/2(+)) = 0.248( 9). The experimentally observed spin alignment for the state of interest was deduced as A = -3.3(9)%.

Published
2016
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26. First observation ofγrays emitted from excited states south-east ofSn132: Theπg9/2−1⊗νf7/2multiplet ofIn83132

Author

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

Subjects
Physics, Radionuclide, 010308 nuclear & particles physics, Fission, Projectile, Neutron emission, 01 natural sciences, Nuclear physics, Excited state, 0103 physical sciences, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Multiplet, Scaling
Abstract

For the first time, the γ decay of excited states has been observed in a nucleus situated in the quadrant south-east of doubly magic Sn132, a region in which experimental information so far is limited to ground-state properties. Six γ rays with energies of 50, 86, 103, 227, 357, and 602 keV were observed following the β-delayed neutron emission from Cd85133, populated in the projectile fission of a U238 beam at the Radioactive Isotope Beam Factory at RIKEN within the EURICA project. The new experimental information is compared to the results of a modern realistic shell-model calculation, the first one in this region very far from stability, focusing in particular on the π0g9/2-1 - ν1f7/2 particle-hole multiplet in In83132. In addition, theoretical estimates based on a scaling of the two-body matrix elements for the πh11/2-1 - νg9/2 analog multiplet in Tl127208, one major proton and one major neutron shell above, are presented. © 2016 American Physical Society.

Published
2016
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27. New isomer found inSb8951140: Sphericity and shell evolution betweenN=82andN=90

Author

F. Nowacki, F. L. Bello Garrote, I. Nishizuka, Tetsuro Komatsubara, F. Browne, Naoki Fukuda, Chang-Bum Moon, Hiroyoshi Sakurai, S. Morimoto, P. A. Söderström, Megumi Niikura, T. Isobe, Ayumi Yagi, Hiroshi Suzuki, N. Kurz, H. Naïdja, C. S. Lee, J. Dudek, I. Kojouharov, Naohito Inabe, Rin Yokoyama, D. S. Ahn, Jin Wu, Zena Patel, R. Lozeva, Atsuko Odahara, J. M. Daugas, R. Daido, Hirofumi Watanabe, Y. K. Kwon, Eiji Ideguchi, Zhengyu Xu, Y. F. Fang, Daichi Murai, P. Lee, H. Schaffner, F. Didierjean, Takashi Kubo, Hiroki Nishibata, H. Takeda, Shin-Ichiro Nishimura, H. Baba, T. Ishigaki, Stephen Rice, D. Kameda, P. Doornenbal, L. Sinclair, H. S. Jung, Giuseppe Lorusso, and Toshiyuki Sumikama

Subjects
Physics, Crystallography, Atomic orbital, 010308 nuclear & particles physics, Neutron number, 0103 physical sciences, Shell (structure), Context (language use), State (functional analysis), 010306 general physics, Coupling (probability), 01 natural sciences, Sphericity
Abstract

In this article we report on the first spectroscopic information on $_{51}^{140}\mathrm{Sb}_{89}$ and the observation of an isomer in this nucleus with ${T}_{1/2}=41(8)$ $\ensuremath{\mu}\mathrm{s}$. It is located in close proximity to $^{140}\mathrm{Sn}$ for $N=90$, where the $\ensuremath{\nu}{f}_{7/2}$ orbit is completely filled. The possible origin of the isomeric state is a $\ensuremath{\pi}{g}_{7/2}^{1}\ifmmode\times\else\texttimes\fi{}\ensuremath{\nu}{f}_{7/2}^{\ensuremath{-}1}$ coupling configuration, resulting in a $({6}^{\ensuremath{-}})$ or $({7}^{\ensuremath{-}})$ spin-parity. This is likely caused by an inversion of the $\ensuremath{\pi}{g}_{7/2}$ and $\ensuremath{\pi}{d}_{5/2}$ orbitals at $N=89$. The existence of such an isomer far from stability is discussed extensively in the context of shell-model calculations and compared to results from mean-field calculations performed using a deformed Woods-Saxon potential. Both approaches suggest the observation of a single-particle excitation mode at an extreme neutron number.

Published
2016
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28. Erosion of N=20 shell in Al33 investigated through the ground-state electric quadrupole moment

Author

Kenichi Yoshida, T. Nagatomo, P. Morel, Y. Hasama, Akihiro Yoshimi, D. L. Balabanski, Yutaka Utsuno, S. Grévy, L. Gaudefroy, Koichiro Asahi, N. Vermeulen, Yuichi Ichikawa, W. Vanderheijden, M. Depuydt, Hideki Ueno, P. Vingerhoets, L. Perrot, Daisuke Kameda, Gerda Neyens, M. De Rydt, J. M. Daugas, E. Yagi, K. Shimada, J. C. Thomas, and Ch. Stodel

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Island of inversion, Nuclear Theory, Shell (structure), 01 natural sciences, 0103 physical sciences, Quadrupole, Moment (physics), Neutron, Atomic physics, 010306 general physics, Nucleon, Ground state, Beam (structure)
Abstract

Electric quadrupole moment Q of the Al 33 ground state has been measured by means of β-NMR spectroscopy using a spin-polarized Al 33 beam produced in a projectile fragmentation reaction. The obtained Q moment, | Q exp ( 33 Al ) | = 132 ( 16 ) e mb , shows a significant excess from the prediction of shell model calculations within the sd shell. The result indicates sizable admixing of pf intruder configurations in the ground state, demonstrating that the N = 20 shell closure certainly erodes in Al 33 , a nucleus located on the border of the island of inversion. Comparison was made with predictions of the Monte Carlo shell model, and also a particle-vibration coupling model treating the neutron pairing correlations in the ground state of Al 33 . Again, a significant admixture of pf intruder configurations to the Al 33 ground state was needed in both theoretical approaches to explain the observed large Q.

Published
2012
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29. Neutron-Induced Capture Cross Sections via the Surrogate Reaction Method

Author

M. Aiche, F. Gunsing, V. Méot, Jason Burke, N. Capellan, S. Czajkowski, I. Matea, L. Tassan-Got, I. Companis, L. Gaudefroy, C. Theroine, J. Taieb, J. M. Daugas, O. Roig, X. Derkx, L. Mathieu, G. Boutoux, B. Haas, E. Bauge, M. G. Porquet, N. Pillet, Olivier Serot, G. Barreau, P. Romain, A. Bail, T. Faul, Beatriz Jurado, D. Dassi, P. Morel, 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), 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 physics, Materials science, General Physics and Astronomy, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy
Abstract

Measurement at the Tandem accelerator of the IPN Orsay; The surrogate reaction method is an indirect way of determining cross sections for nuclear reactions that proceed through a compound nucleus. This technique enablesneutron-induced cross sections to be extracted for nuclear reactions on short-lived unstable nuclei that otherwise can not be measured. This technique has been succesfully applied to determine the neutron-induced fission cross sections of several short-lived nuclei. In this work we investigate whether this powerful technique can also be used to determine of neutron-induced capture cross sections. For this purpose we 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. This surrogate experiment has been performed in March 2010. The experimental technique used and the first preliminary results will be presented.

Published
2011
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30. Quadrupole moment of the 6− isomeric state in 66Cu: Interplay between different nuclear deformation driving forces

Author

P. Morel, R. L. Lozeva, T. Faul, Sophie Péru, G. Audi, L. Risegari, S. Cabaret, F. Ibrahim, Georgi P. Georgiev, D. Verney, M. Ferraton, D. L. Balabanski, E. Fiori, J. M. Daugas, Deyan T. Yordanov, and C. Gaulard

Subjects
Physics, Coupling, Nuclear and High Energy Physics, 010308 nuclear & particles physics, State (functional analysis), Prolate spheroid, Deformation (meteorology), 01 natural sciences, Atomic orbital, 0103 physical sciences, Quadrupole, Oblate spheroid, Atomic physics, 010306 general physics
Abstract

We have measured the spectroscopic quadrupole moment of the 6 − isomeric state in 66Cu to be | Q s | = 18.6 ( 12 ) efm 2 . This state results from a weak coupling of the π p 3 / 2 and the ν g 9 / 2 orbitals, which lead to sizable deformation at oblate and prolate shapes, correspondingly, in the 68Ni region. The interplay between these two different deformation-driving orbitals is observed at N = 37 for the 6 − state resulting in a most probable oblate shape.

Published
2011
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31. Precision measurement of the electric quadrupole moment of 31Al and determination of the effective proton charge in the sd-shell

Author

C. Stodel, K. Shimada, J. C. Thomas, T. Nagatomo, J. M. Daugas, Hideki Ueno, N. Vermeulen, P. Vingerhoets, M. De Rydt, Gerda Neyens, S. Grévy, M. Depuydt, Yutaka Utsuno, L. Gaudefroy, Yuichi Ichikawa, P. Morel, L. Perrot, Akihiro Yoshimi, Y. Hasama, W. Vanderheijden, T. Otsuka, D. L. Balabanski, Koichiro Asahi, Instituut voor Kern-en Stralingsfysica (IKS), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Department of Physics [Tokyo], Tokyo Institure of Technology, 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), 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), RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), 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), CYRIC, Tohoku University [Sendai], Japan Atomic Energy Agency, 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, Proton, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Effective nuclear charge, Shell model, 0103 physical sciences, Nuclear Experiment (nucl-ex), 31Al, 21.10.Ky, 21.60.Cs, 24.70.+s, 27.30.+t, 25.70.Mn, 29.27.Hj, 76.60.-k, 010306 general physics, Nuclear Experiment, Physics, Coupling constant, Magnetic moment, 010308 nuclear & particles physics, Island of inversion, Electric quadrupole moment, β Nuclear Magnetic Resonance (β-NMR), Quadrupole, Atomic physics, Nucleon, Ground state
Abstract

The electric quadrupole coupling constant of the 31 Al ground state is measured to be ν Q = | e Q V z z h | = 2196 ( 21 ) kHz using two different β -NMR (Nuclear Magnetic Resonance) techniques. For the first time, a direct comparison is made between the continuous rf technique and the adiabatic fast passage method. The obtained coupling constants of both methods are in excellent agreement with each other and a precise value for the quadrupole moment of 31 Al has been deduced: | Q ( Al 31 ) | = 134.0 ( 16 ) mb . Comparison of this value with large-scale shell-model calculations in the sd and sdpf valence spaces suggests that the 31 Al ground state is dominated by normal sd-shell configurations with a possible small contribution of intruder states. The obtained value for | Q ( Al 31 ) | and a compilation of measured quadrupole moments of odd- Z even- N isotopes in comparison with shell-model calculations shows that the proton effective charge e p = 1.1 e provides a much better description of the nuclear properties in the sd-shell than the adopted value e p = 1.3 e .

Published
2009
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32. g factor of the exotic N=21 isotope 34Al: probing the N=20 and N=28 shell gaps at the border of the 'island of inversion'

Author

K. T. Flanagan, J. M. Daugas, Yu. E. Penionzhkevich, F. de Oliveira Santos, I. Matea, P. Morel, Yutaka Utsuno, C. Stodel, Gerda Neyens, M. De Rydt, Deyan Yordanov, Takaharu Otsuka, P. Himpe, J. C. Thomas, G. Belier, D. L. Balabanski, L. Perrot, N. Vermeulen, and N. Smirnova

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Magnetic moment, 010308 nuclear & particles physics, Island of inversion, 01 natural sciences, Dipole, 0103 physical sciences, Isotopes of silicon, Atomic physics, 010306 general physics, Nucleon, Ground state, Isotopes of magnesium
Abstract

For the first time the g factor of an isotope beyond N = 20 near the ‘island of inversion’ has been measured. A 34Al radioactive beam was produced in a one-neutron pickup reaction on a 36S primary beam at 77.5 MeV/u, providing a large spin-polarization for application of the β-Nuclear Magnetic Resonance (β-NMR) method. The measured g factor of 34Al, | g | = 0.539 ( 2 ) , combined with results from earlier β-decay studies, allows to firmly assign a ground state spin/parity 4 − . Comparison to large scale shell model calculations reveals that a dominant amount of intruder components is needed in the 34Al wave function to account for the observed large magnetic moment μ = ( + ) 2.156 ( 16 ) μ N . This reveals Z = 13 to be a true ‘transition number’ between the normal Z = 14 Si isotopes and the abnormal Z = 12 Mg isotopes. The sensitivity of this odd–odd ground state dipole moment to the N = 20 , as well as the N = 28 gap, reveals that both are significantly reduced, despite Z = 13 being outside the conventional island of inversion.

Published
2008
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33. Publisher’s Note:Rb379760: The Cornerstone of the Region of Deformation aroundA∼100[Phys. Rev. Lett.115, 172501 (2015)]

Author

Ph Morel, R. Chevrier, Marcus Scheck, P. Reiter, J. M. Daugas, N. Bree, C. Sotty, Georgi P. Georgiev, P. J. Napiorkowski, F. Wenander, A. Blazhev, H. De Witte, T. Kröll, Liam Gaffney, G. S. Simpson, F. G. Kondev, T. Davinson, M. Zielińska, J. Konki, J. Pakarinen, M. Seidlitz, K. Geibel, Jan Diriken, B. Siebeck, K. Hadynska-Klek, D. L. Balabanski, S. Das Gupta, Andrew Stuchbery, N. Warr, and H. Törnqvist

Subjects
Physics, Classical mechanics, General Physics and Astronomy, Coulomb excitation, Deformation (meteorology)
Published
2015
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34. β-delayedγ-ray spectroscopy of non-yrast states inTe138near the neutron drip line

Author

Shin-Ichiro Nishimura, F. Didierjean, Tetsuro Komatsubara, Giuseppe Lorusso, R. Lozeva, F. Browne, Eiji Ideguchi, Daichi Murai, F. L. Bello Garrote, I. Nishizuka, Rin Yokoyama, Y. F. Fang, S. Morimoto, Hiroshi Watanabe, Jin Wu, K. Tshoo, Y. K. Kwon, L. Sinclair, Naohito Inabe, Chang-Bum Moon, Takashi Kubo, T. Isobe, Naoki Fukuda, Toshiyuki Sumikama, Stephen Rice, H. Takeda, Megumi Niikura, Ayumi Yagi, D. S. Ahn, D. Kameda, P. A. Söderström, Hiroki Nishibata, P. Doornenbal, Zena Patel, Zhengyu Xu, Atsuko Odahara, J. M. Daugas, Hiroyoshi Sakurai, Hiroshi Suzuki, C. S. Lee, P. Lee, Hyo Soon Jung, R. Daido, H. Baba, and T. Ishigaki

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Double beta decay, Yrast, SHELL model, Nuclear drip line, Spectroscopy, Beta decay
Published
2015
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35. Rb973760: The Cornerstone of the Region of Deformation aroundA∼100

Author

G. S. Simpson, T. Kröll, A. Blazhev, J. Konki, D. L. Balabanski, R. Chevrier, Andrew Stuchbery, Jan Diriken, J. M. Daugas, F. G. Kondev, Janne Pakarinen, C. Sotty, B. Siebeck, Philippe Morel, M. Zielińska, Georgi P. Georgiev, P. Reiter, S. Das Gupta, K. Hadynska-Klek, F. Wenander, M. Seidlitz, Liam Gaffney, Marcus Scheck, K. Geibel, H. Törnqvist, H. De Witte, P. J. Napiorkowski, N. Warr, N. Bree, and Thomas Davinson

Subjects
General Physics and Astronomy
Published
2015
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36. Publisher's Note: New decay scheme of theSb85511366−isomer [Phys. Rev. C92, 024304 (2015)]

Author

D. Kameda, P. Doornenbal, Hiroyoshi Sakurai, S. Morimoto, Hiroki Nishibata, Tetsuro Komatsubara, L. Sinclair, Naohito Inabe, H. Baba, F. Nowacki, Y. K. Kwon, H. Naïdja, T. Ishigaki, F. Didierjean, Toshiyuki Sumikama, P. A. Söderström, Hiroshi Watanabe, K. Tshoo, Hyo Soon Jung, Takashi Kubo, T. Isobe, Ayumi Yagi, D. S. Ahn, Daichi Murai, Eiji Ideguchi, Giuseppe Lorusso, F. Browne, F. L. Bello Garrote, I. Nishizuka, Y. F. Fang, Rin Yokoyama, H. Takeda, Tadashi Shimoda, R. Daido, Jinguang Wu, N. Kurz, Z. Patel, Ziye Xu, Stephen Rice, Shin-Ichiro Nishimura, Naoki Fukuda, Megumi Niikura, J. M. Daugas, R. Lozeva, Chang-Bum Moon, I. Kojouharov, H. Schaffner, Hiroshi Suzuki, and Atsuko Odahara

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, Quantum mechanics
Published
2015
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37. (97)(37)Rb(60): The Cornerstone of the Region of Deformation around A ∼ 100 [corrected]

Author

C, Sotty, M, Zielińska, G, Georgiev, D L, Balabanski, A E, Stuchbery, A, Blazhev, N, Bree, R, Chevrier, S, Das Gupta, J M, Daugas, T, Davinson, H, De Witte, J, Diriken, L P, Gaffney, K, Geibel, K, Hadyńska-Klȩk, F G, Kondev, J, Konki, T, Kröll, P, Morel, P, Napiorkowski, J, Pakarinen, P, Reiter, M, Scheck, M, Seidlitz, B, Siebeck, G, Simpson, H, Törnqvist, N, Warr, and F, Wenander

Abstract

Excited states of the neutron-rich nuclei (97,99)Rb were populated for the first time using the multistep Coulomb excitation of radioactive beams. Comparisons of the results with particle-rotor model calculations provide clear identification for the ground-state rotational band of (97)Rb as being built on the πg(9/2) [431] 3/2(+) Nilsson-model configuration. The ground-state excitation spectra of the Rb isotopes show a marked distinction between single-particle-like structures below N=60 and rotational bands above. The present study defines the limits of the deformed region around A∼100 and indicates that the deformation of (97)Rb is essentially the same as that observed well inside the deformed region. It further highlights the power of the Coulomb-excitation technique for obtaining spectroscopic information far from stability. The (99)Rb case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams.

Published
2015

38. New decay scheme of theSb8551136 6−isomer

Author

Rin Yokoyama, Chang-Bum Moon, Giuseppe Lorusso, Naoki Fukuda, Takashi Kubo, Hiroyoshi Sakurai, I. Kojouharov, H. S. Jung, H. Takeda, Megumi Niikura, Eiji Ideguchi, F. Browne, Tetsuro Komatsubara, Atsuko Odahara, H. Baba, S. Morimoto, R. Daido, T. Ishigaki, F. L. Bello Garrote, I. Nishizuka, K. Tshoo, Shin-Ichiro Nishimura, Naohito Inabe, Hirofumi Watanabe, L. Sinclair, Zena Patel, F. Nowacki, T. Isobe, F. Didierjean, Tadashi Shimoda, N. Kurz, Daichi Murai, H. Naïdja, Toshiyuki Sumikama, R. Lozeva, P. A. Söderström, Ayumi Yagi, D. Kameda, Jin Wu, J. M. Daugas, Hiroshi Suzuki, P. Doornenbal, H. Schaffner, Y. K. Kwon, D. S. Ahn, Y. F. Fang, Zhengyu Xu, Hiroki Nishibata, and Stephen Rice

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, Fission, Yrast, Neutron, Atomic physics, Ground state
Abstract

We report new data on the $^{136}\mathrm{Sb}\phantom{\rule{4pt}{0ex}}{6}^{\ensuremath{-}}$ yrast isomer with ${T}_{1/2}=489(40) \mathrm{ns}$ and $\ensuremath{\pi}{g}_{7/2}^{1}\ifmmode\times\else\texttimes\fi{}\ensuremath{\nu}{f}_{7/2}^{3}$ configuration, populated in the projectile fission of $^{238}\mathrm{U}$ on a $^{9}\mathrm{Be}$ target. The analysis confirms the lifetime, providing a good accuracy measurement. In addition, the decay of the isomer to the ground state is newly suggested. Our result for the isomeric decay scheme is in a good agreement with shell-model calculations.

Published
2015
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39. Properties of Intruder States in 34Al and 34Si

Author

J. M. Daugas, F. Rotaru, F. Negoita, Ph. Dessagne, J. Mrazek, A. Negret, S. Toma, D. M. Filipescu, Thierry Stora, L. M. Fraille, T. Sava, István Kuti, Ioana Gheorghe, M. Stanoiu, D. Pietreanu, D. Sohler, P. Morfouace, R. Mărginean, S. Calinescu, S. Franchoo, N. Marginean, I. Stefan, C. Borcea, Cosmin Teodor Mihai, Ph Morel, R. Suvaila, R. Lica, R. Borcea, and S. Grévy

Subjects
Physics, Database, computer.software_genre, computer
Published
2015
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40. New Isomers in Neutron-Rich Cs Isotopes

Author

F. Didierjean, Jinguang Wu, Naoki Fukuda, R. Daido, Megumi Niikura, P. Lee, Y. F. Fang, Toshiyuki Sumikama, Ayumi Yagi, Stephen Rice, Daichi Murai, D. Kameda, Hyo Soon Jung, Hiroshi Suzuki, Shin-Ichiro Nishimura, C. S. Lee, S. Morimoto, Giuseppe Lorusso, P. Doornenbal, R. Lozeva, F. L. Bello Garrote, Y. K. Kwon, Tomio Kubo, H. Baba, Tetsuro Komatsubara, I. Nishizuka, Naohito Inabe, Rin Yokoyama, T. Ishigaki, Hiroshi Watanabe, K. Tshoo, Atsuko Odahara, Chang-Bum Moon, Zhengyu Xu, Hiroki Nishibata, T. Isobe, Hiroyoshi Sakurai, F. Browne, Laura C. Sinclair, P. A. Söderström, Tadashi Shimoda, H. Takeda, Z. Patel, Eiji Ideguchi, D. S. Ahn, and J. M. Daugas

Subjects
Materials science, Isotope, Radiochemistry, Neutron
Published
2015
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41. βdecay ofCd129and excited states inIn129

Author

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

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Excited state, 0103 physical sciences, Atomic physics, 010306 general physics, 01 natural sciences
Published
2015
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42. Erratum: Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes [Phys. Rev. Lett.108, 062701 (2012)]

Author

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

Subjects
Physics, Nuclear physics, Isotope, General Physics and Astronomy, Neutron, Deformation (meteorology)
Published
2015
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43. Properties of low-lying intruder states in 34Al and 34Si populated in the beta-decay of 34Mg

Author

R. Lica, R. Borcea, Thierry Stora, F. Negoita, R. Mărginean, D. Pietreanu, Ph. Desagne, A. Negret, I. Stefan, C. Mihai, S. Calinescu, D. Ghita, D. M. Filipescu, T. Sava, C. Borcea, L. M. Fraile, I. Kuti, S. Grévy, S. Franchoo, P. Morel, C. A. Ur, R. Suvaila, M. Stanoiu, F. Rotaru, S. Toma, J. Mrazek, J. M. Daugas, N. Marginean, Ioana Gheorghe, D. Sohler, and P. Mourface

Subjects
Island of inversion, Chemistry, Excited state, Gamma spectroscopy, Isotopes of silicon, Atomic physics, Spectroscopy, Beta decay, Isotopes of magnesium, Radioactive decay
Abstract

The results of the IS530 experiment at ISOLDE revealed new information concerning several nuclei close to the N ≈ 20 'Island of Inversion' - 34Mg, 34Al, 34Si. The half-life of 34Mg was found to be three times larger than the adopted value (63(1) ms instead of 20(10) ms). The beta-gamma spectroscopy of 34Mg performed for the first time in this experiment, led to the first experimental level scheme for 34Al, also showing that the full beta strength goes through the predicted 1+ isomer in 34Al [1] and/or excited states that deexcite to it. The subsequent beta-decay of the 1+ isomer in 34Al allowed the observation of new gamma lines in 34Si, (tentatively) associated with low-spin high-energy excited states previously unobserved.

Published
2015
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44. Nuclear excitation by electronic processes: NEEC and NEET effects

Author

J. M. Daugas, G. Gosselin, D. Gogny, V. Méot, and P. Morel

Subjects
Physics, Nuclear and High Energy Physics, Ion beam, Chemistry, Electron capture, Thermodynamic equilibrium, Measure (physics), Plasma, Molecular electronic transition, Nuclear physics, Double beta decay, Excited state, Uranium-235, Atomic physics, Nuclear Experiment, Excitation
Abstract

The nuclear excitation by electron capture (NEEC) and nuclear excitation by electronic transition (NEET), and related de-excitation, are two important electromagnetic processes to modify the nuclear state populations. In this paper, we present, on one hand, an experiment, accepted at GANIL (France) in September 2004, to measure the NEEC effect with a fully stripped 57Fe ion beam and, on the other hand, a complete calculation leading to the NEET rate of the first excited state of the 235U in a local thermodynamic equilibrium (LTE) plasma.

Published
2004
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45. Observation of bound excited states in 15B

Author

S. M. Lukyanov, J. C. Angélique, H. Savajols, M. J. Lopez-Jimenez, Y. Sobolev, M. Lewitowicz, D. Guillemaud-Mueller, M. Stanoiu, W. Mittig, C. Stodel, C. Bourgeois, Josette Duprat, F. Pougheon, Marie-Geneviève Porquet, B. A. Brown, Yu. E. Penionzhkevich, F. De Oliveira-Santos, C. Donzaud, O. Sorlin, F. Azaiez, P. Roussel-Chomaz, József Tímár, N. L. Achouri, D. Sohler, S. Grévy, Z. Dlouhy, M. Belleguic, C. Borcea, S. Leenhardt, Zs. Dombrádi, M. G. Saint-Laurent, J. M. Daugas, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear and High Energy Physics, Valence (chemistry), 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Time of flight, Projectile and target fragmentation, Excited state, 0103 physical sciences, Bound state, Nuclear fusion, Neutron, 25.70.Mn, 23.20.Lv, 27.20.+n, 21.60.Cs, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy, gamma transitions and level energies
Abstract

The structure of the A/Z = 3 nucleus 15B has been investigated using the in-beam $\gamma$ -spectroscopy technique with a fragmentation reaction of a 36S beam on a 9Be target at 77.5 ${\rm MeV}\cdot A$ . The fragments were identified and selected by their energy loss and time of flight using the SPEG spectrograph. $\gamma$ -ray energies and intensities have been measured in coincidence with the projectile-like fragments. From this information as well as from the $\gamma\gamma$ -coincidence relationships a level scheme is proposed for 15B up to the neutron separation energy. The experimental results have been interpreted using shell model calculations in the psd valence space. Effects of the weakly bound nature of the valence neutrons have been observed.

Published
2004
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46. Spectroscopy at the N=20 shell closure: the β-decay of32Mg

Author

G. Walter, D. Guillemaud Mueller, S. Gre´vy, Jean Péter, L. Achouri, W. N. Catford, F. Negoita, C. Borcea, A. Knipper, S. Courtin, P. Baumann, C. N. Timis, Oleg B. Tarasov, J.L. Lecouey, E. Poirier, P. Dessagne, J. M. Daugas, J.C. Ange´lique, M. Stanoiu, N. A. Orr, E. Lie´nard, R. Hadeler, A. Buta, J. Mrazek, S. Pietri, François-René Lecolley, M. Lewitowicz, F. de Oliveira, Ch. Miehé, Y. E. Penionzhkevich, Z. Dlouhy, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Island of inversion, Nuclear Theory, Shell (structure), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Neutron spectroscopy, 0103 physical sciences, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy, Nucleon, Isotopes of magnesium, ComputingMilieux_MISCELLANEOUS, Radioactive decay
Abstract

The shell closure N=20 has been studied by β-decay spectroscopy experiment performed at the GANIL facility. The experimental setup is described and first results on the beta-decay of 32 Mg are presented. The extracted level scheme of 32 Al is compared to Shell Model calculations and discussed in the light of the structural changes observed for the nuclei of the so-called island of inversion. Finally, neutron time-of-flight spectrum from the β-delayed neutron decay of 32 Mg is presented.

Published
2004
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47. High spin K isomeric target of

Author

E. Morichon, J.-M. Daugas, Y. Boulin, L. Maunoury, V. Méot, G. Fioni, G. Belier, Danas Ridikas, J.E. Sauvestre, O. Roig, Alain Letourneau, F. Marie, P. Delbourgo, and Jean Aupiais

Subjects
Nuclear physics, Physics, Chemical separation, Nuclear and High Energy Physics, chemistry, Neutron flux, Analytical chemistry, chemistry.chemical_element, Spin (physics), Instrumentation, Lutetium
Abstract

The techniques used to produce a 177 m Lu (J π =23/2 − ,T 1/2 =160.4 days) target are described in this paper. Firstly, an isotopic separation of an enriched lutetium sample was used to reach a purity of 176 Lu close to 99.993%. Afterwards, the high neutron flux of the Grenoble Institut Laue-Langevin reactor was used to produce the 177 m Lu isomer by the 176 Lu(n,γ) reaction. Finally, a chemical separation was performed to extract 1013 nuclei of 177 m Lu . Thanks to this experiment, we have been able to estimate the destruction cross-section of the 177 m Lu .

Published
2004
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48. 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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49. 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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50. 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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