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IOP Publishing, Chinese Physics C, 10(39), p. 104001, 2015

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

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

Journal article published in 2015 by Xu Xing, Ge Zhuang, Meng Wang ORCID, Yu-Hu Zhang, Hu-Shan Xu, Peng Shuai, Yuri A. Litvinov, Xiao-Lin Tu, Xiao-Hong Zhou, Bao-Hua Sun ORCID, Jia-Wen Xia, You-Jin Yuan, Jian-Cheng Yang, Klaus Blaum, Rui-Jiu Chen and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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.