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

• Main Authors: Xu, Xing, Wang, Meng, Zhang, Yu-hu, Xu, Hu-shan, Shuai, Peng, Tu, Xiao-lin, Litvinov, Yuri A, Zhou, Xiao-hong, Sun, Bao-hua, Yuan, You-jin, Xia, Jia-wen, Yang, Jian-cheng, Blaum, KLaus, Chen, Rui-jiu, Chen, Xiang-cheng, Fu, Chao-yi, Ge, Zhuang, Hu, Zheng-guo, Huang, Wen-jia, Liu, Da-wei, Lam, Yi-hua, Ma, Xin-wen, Mao, Rui-shi, Uesaka, T, Xiao, Guo-ging, Xing, Yuan-ming, Yamaguchi, T, Yamaguchi, Y, Zeng, Qi, Yan, Xin-liang, Zhao, Hong-wei, Zhao, Tie-cheneg, Zhang, Wei, Zhan, Wen-long
• Format: Journal Article
• Language: English
• Published: 21.03.2016
• Subjects: Physics - Nuclear Experiment
• DOI: 10.48550/arxiv.1603.06404

Chinese Physics C Vol. 39, No. 10 (2015) 104001 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.