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In this paper, we present direct mass measurements of neutron-rich $^{86}$Krprojectile fragments conducted at the HIRFL-CSR facility in Lanzhou byemploying the Isochronous Mass Spectrometry (IMS) method. The new mass excessesof $^{52-54}$Sc nuclides are determined to be -40492(82), -38928(114),-34654(540) keV, which show a significant increase of binding energy comparedto 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 numbersindicates a strong sub-shell closure at neutron number $N$ = 32 in Sc isotopes.

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