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

Abstract : In this paper, we present direct mass measurements of neutron-rich Kr-86 projectile fragments conducted at the HIRFL-CSR facility in Lanzhou by employing the Isochronous Mass Spectrometry (IMS) method. The new mass excesses of 52-54SC 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, Sc-53 and Sc-64 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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Submitted on : Friday, December 18, 2015 - 4:41:56 PM
Last modification on : Tuesday, July 16, 2019 - 9:02:07 AM

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X Xu, M Wang, Yh Zhang, Hs Xu, P Shuai, et al.. Direct mass measurements of neutron-rich 86Kr projectile fragments and the persistence of neutron magic number N=32 in Sc isotopes. Chinese Physics C, IOP Publishing, 2015, 39 (issue 10), pp.104001. ⟨10.1088/1674-1137/39/10/104001⟩. ⟨in2p3-01246547⟩

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