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

作者：XU Xing; WANG Meng; ZHANG Yu Hu; XU Hu Shan; SHUAI Peng; TU Xiao Lin; Yuri A Litvinov; ZHOU Xiao Hong; SUN Bao Hua; YUAN You Jin; XIA Jia Wen; YANG Jian Cheng; Klaus Blaum; 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; T Uesaka; XIAO Guo Qing; XING Yuan Ming; T Yamaguchi; Y Yamaguchi; ZENG Qi; YAN Xin Liang; ZHAO Hong Wei; ZHAO Tie Cheng; ZHANG Wei; ZHAN Wen Long

来源：Chinese Physics C, 2015, (10): 28-32.

• isochronous mass spectrometry
• exotic nuclei
• mass excess
• new magic number

In this paper, we present direct mass measurements of neutron-rich86 Kr projectile fragments conducted at the HIRFL-CSR facility in Lanzhou by employing the Isochronous Mass Spectrometry(IMS) method. The new mass excesses of52-54 Sc nuclides are determined to be-40492(82),-38928(114),-34654(540) ke V, which show a significant increase of binding energy compared to the reported ones in the Atomic Mass Evaluation 2012(AME12).In particular,53 Sc and54Sc are more bound by 0.8 Me V and 1.0 Me V, 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.

• 出版日期2015
• 单位中国科学院大学; 中国科学技术大学