Abstract

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.

Details

Title
Collectivity of neutron-rich Cr and Fe toward N=50
Author
Werner, V; Santamaria, C; Louchart, C; Obertelli, A; Doornenbal, P; Nowacki, F; Authelet, G; Baba, H; Calvet, D; Château, F; Corsi, A; Delbart, A; J-M Gheller; Gillibert, A; Isobe, T; Lapoux, V; Matsushita, M; Momiyama, S; Motobayashi, T; Niikura, M; Otsu, H; Péron, C; Peyaud, A; Pollacco, E C; J-Y Roussé; Sakurai, H; Sasano, M; Shiga, Y; Takeuchi, S; Taniuchi, R; Uesaka, T; Wang, H; Yoneda, K; Browne, F; Chung, L X; Dombradi, Zs; Franchoo, S; Giacoppo, F; Gottardo, A; Hadynska-Klek, K; Korkulu, Z; Koyama, S; Kubota, Y; Lee, J; Lettmann, M; Lozeva, R; Matsui, K; Miyazaki, T; Nishimura, S; Olivier, L; Ota, S; Patel, Z; Pietralla, N; Sahin, E; Shand, C; P-A Söderström; Stefan, I; Steppenbeck, D; Sumikama, T; Suzuki, D; Vajta, Zs; J Wu; Z Xu
Section
Nuclear Spectroscopy – Experiment and Theory
Publication year
2016
Publication date
2016
Publisher
EDP Sciences
ISSN
21016275
e-ISSN
2100014X
Source type
Conference Paper
Language of publication
English
DOI
https://doi.org/10.1051/epjconf/201610703007
ProQuest document ID
1761129337
Copyright
© 2016. This work is licensed under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and conditions, you may use this content in accordance with the terms of the License.