Triplet energy differences and the low lying structure of Ga62

T. W. Henry et al.
Phys. Rev. C 92, 024315 – Published 20 August 2015

Abstract

Background: Triplet energy differences (TED) can be studied to yield information on isospin-non-conserving interactions in nuclei.

Purpose: The systematic behavior of triplet energy differences (TED) of T=1, Jπ=2+ states is examined. The A=62 isobar is identified as having a TED value that deviates significantly from an otherwise very consistent trend. This deviation can be attributed to the tentative assignments of the pertinent states in Ga62 and Ge62.

Methods: An in-beam γ-ray spectroscopy experiment was performed to identify excited states in Ga62 using Gamma-Ray Energy Tracking In-Beam Nuclear Array with the S800 spectrometer at NSCL using a two-nucleon knockout approach. Cross-section calculations for the knockout process and shell-model calculations have been performed to interpret the population and decay properties observed.

Results: Using the systematics as a guide, a candidate for the transition from the T=1, 2+ state is identified. However, previous work has identified similar states with different Jπ assignments. Cross-section calculations indicate that the relevant T=1, 2+ state should be one of the states directly populated in this reaction.

Conclusions: As spins and parities were not measurable, it is concluded that an unambiguous identification of the first T=1, 2+ state is required to reconcile our understanding of TED systematics.

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  • Received 20 May 2015
  • Revised 9 July 2015

DOI:https://doi.org/10.1103/PhysRevC.92.024315

©2015 American Physical Society

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Vol. 92, Iss. 2 — August 2015

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