Jungclaus, A., Doornenbal, P., Acosta, J. et al. (16 more authors) (2024) Position of the single-particle 3/2− state in 135Sn and the N=90 subshell closure. Physics Letters B. 138561. ISSN 0370-2693
Abstract
The decay of excited states of the nucleus 135Sn, with three neutrons outside the doubly-magic 132Sn core, was studied in an experiment performed at the Radioactive Isotope Beam Factory at RIKEN. Several γ rays emitted from excited 135Sn ions were observed following one-neutron and one-neutron-one-proton removal from 136Sn and 137Sb beams, respectively, on a beryllium target at relativistic energies. Based on the analogy to 133Sn populated via one-neutron removal from 134Sn, an excitation energy of 695(15) keV is assigned to the 3/2− state with strongest single-particle character in 135Sn. This result provides the first direct information about the evolution of the neutron shell structure beyond N=82 and thus allows for a crucial test of shell-model calculations in this region. The experimental findings are in full agreement with calculations performed employing microscopic effective two-body interactions derived from CD-Bonn and N3LO nucleon-nucleon potentials, which do not predict a pronounced subshell gap at neutron number N=90. The occurrence of such a gap in 140Sn, i.e., when the 1f7/2 orbital is completely filled, had been proposed in the past, in analogy to the magicity of 48Ca, featuring a completely filled 0f7/2 orbital one harmonic oscillator shell below.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024 The Author(s). |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 15 Mar 2024 09:20 |
Last Modified: | 02 Apr 2025 23:27 |
Published Version: | https://doi.org/10.1016/j.physletb.2024.138561 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1016/j.physletb.2024.138561 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:210333 |