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

• Published in: arXiv.org
• Main Authors: Xu, Xing, Wang, Meng, Yu-hu, Zhang, Hu-shan, Xu, Peng Shuai, Xiao-lin, Tu, Litvinov, Yuri A, Xiao-hong, Zhou, Bao-hua, Sun, You-jin, Yuan, Jia-wen, Xia, Jian-cheng, Yang, Blaum, KLaus, Chen, Rui-jiu, 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, Uesaka, T, Guo-ging Xiao, Yuan-ming, Xing, Yamaguchi, T, Yamaguchi, Y, Zeng, Qi, Xin-liang, Yan, Hong-wei, Zhao, Zhao, Tie-cheneg, Zhang, Wei, Wen-long, Zhan
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 21.03.2016
• Subjects: Atomic properties; Fragments; Isotopes; Mass spectrometry; Nuclides; Projectiles
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1603.06404

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.