EPJ Web of Conferences
Volume 107, 2016International Conference on Nuclear Structure and Related Topics (NSRT15)
|Number of page(s)||6|
|Section||Nuclear Spectroscopy – Experiment and Theory|
|Published online||19 January 2016|
Collectivity of neutron-rich Cr and Fe toward N=50
1 Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
2 CEA, Centre de Saclay, IRFU, F-91191 Gif-sur-Yvette, France
3 RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
4 IPHC, CNRS/IN2P3, Université de Strasbourg, F-67037 Strasbourg, France
5 Center for Nuclear Study, University of Tokyo, RIKEN campus, Wako, Saitama 351-0198, Japan
6 Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
7 Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 172-8501, Japan
8 School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom
9 Institute for Nuclear Science & Technology, VAEI, 179 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
10 MTA Atomki, P.O. Box 51, Debrecen H-4001, Hungary
11 Institut de Physique Nucléaire Orsay, IN2P3-CNRS, 91406 Orsay Cedex, France
12 Department of Physics, University of Oslo, N-0316 Oslo, Norway
13 Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong
14 Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
15 Department of Physics, Tohoku University, Sendai 980-8578, Japan
16 State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P.R. China
Published online: 19 January 2016
Within the SEASTAR project at RIKEN-RIBF, 66Cr and 70,72Fe have been produced via protonknockout reactions, and their first excited 2+ and 4+ states have been discovered. The combination of the liquid-hydrogen target and TPC system MINOS has been used in combination with the DALI2 detector array for the first time. A 345 MeV/u 238U beam with a mean intensity of about 12 pnA impinged on a Be target. Fission fragments were separated and identified using the BigRIPS spectrograph, and reaction products were analyzed using the ZeroDegree spectrograph. A plateau of excitation energies, with a small change in the systematic trends past N = 44, reveals an extension of the N = 40 region of collectivity toward N = 50. Hence, the isotopes of interest are located within the N = 40 island of inversion. An interpretation of the observed trends is offered through large scale shell model calculations.
© Owned by the authors, published by EDP Sciences, 2016
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