Direct mass measurements of neutron-rich $^{86}$Kr projectile fragments and the persistence of neutron magic number $N$ = 32 in Sc isotopes

Xing Xu; Meng Wang; Yu-hu Zhang; Hu-shan Xu; Peng Shuai; Xiao-lin Tu; Yuri A. Litvinov; Xiao-hong Zhou; Bao-hua Sun; You-jin Yuan; Jia-wen Xia; Jian-cheng Yang; KLaus Blaum; Rui-jiu Chen; Xiang-cheng Chen; Chao-yi Fu; Zhuang Ge; Zheng-guo Hu; Wen-jia Huang; Da-wei Liu; Yi-hua Lam; Xin-wen Ma; Rui-shi Mao; T. Uesaka; Guo-ging Xiao; Yuan-ming Xing; T. Yamaguchi; Y. Yamaguchi; Qi Zeng; Xin-liang Yan; Hong-wei Zhao; Tie-cheneg Zhao; Wei Zhang; Wen-long Zhan

doi:10.1088/1674-1137/39/10/104001

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arXiv · 1603.06404

Direct mass measurements of neutron-rich $^{86}$Kr projectile fragments and the persistence of neutron magic number $N$ = 32 in Sc isotopes

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Abstract

In this paper, we present direct mass measurements of neutron-rich $^{86}$Kr projectile fragments conducted at the HIRFL-CSR facility in Lanzhou by employing the Isochronous Mass Spectrometry (IMS) method. The new mass excesses of $^{52-54}$Sc nuclides are determined to be -40492(82), -38928(114), -34654(540) keV, which show a significant increase of binding energy compared to the reported ones in the Atomic Mass Evaluation 2012 (AME12). In particular, $^{53}$Sc and $^{54}$Sc are more bound by 0.8 MeV and 1.0 MeV, respectively. The behavior of the two neutron separation energy with neutron numbers indicates a strong sub-shell closure at neutron number $N$ = 32 in Sc isotopes.

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Xing Xu, Meng Wang, Yu-hu Zhang, Hu-shan Xu, Peng Shuai, Xiao-lin Tu, Yuri A. Litvinov, Xiao-hong Zhou, Bao-hua Sun, You-jin Yuan, Jia-wen Xia, Jian-cheng Yang, KLaus Blaum, Rui-jiu Chen, Xiang-cheng Chen, Chao-yi Fu, Zhuang Ge, Zheng-guo Hu, Wen-jia Huang, Da-wei Liu, Yi-hua Lam, Xin-wen Ma, Rui-shi Mao, T. Uesaka, Guo-ging Xiao, Yuan-ming Xing, T. Yamaguchi, Y. Yamaguchi, Qi Zeng, Xin-liang Yan, Hong-wei Zhao, Tie-cheneg Zhao, Wei Zhang, Wen-long Zhan. 2016-03-21. Direct mass measurements of neutron-rich $^{86}$Kr projectile fragments and the persistence of neutron magic number $N$ = 32 in Sc isotopes. https://doi.org/10.1088/1674-1137%2F39%2F10%2F104001

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