"southwestern" boundary of the N=40 island of inversion: First study of low-lying bound excited states in v 59 and v 61

SunFlower Collaboration

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Abstract

The low-lying level structure of V59 and V61 was investigated for the first time. The neutron knockout reaction and inelastic proton scattering were applied for V61 while the neutron knock-out reaction provided the data for V59. Four and five new transitions were determined for V59 and V61, respectively. Based on the comparison to our shell-model calculations using the Lenzi-Nowacki-Poves-Sieja (LNPS) interaction, three of the observed γ rays for each isotope could be placed in the level scheme and assigned to the decay of the first 11/2- and 9/2- levels. The (p,p′) excitation cross sections for V61 were analyzed by the coupled-channels formalism assuming quadrupole plus hexadecapole deformations. Due to the role of the hexadecapole deformation, V61 could not be unambiguously placed on the island of inversion.

Original languageEnglish
Article number064321
JournalPhysical Review C
Volume106
Issue number6
DOIs
Publication statusPublished - Dec 2022

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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