Triplet energy differences and the low lying structure of $^{62}$Ga

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, J π = 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 62Ga and 62Ge. Methods: An in-beam γ -ray spectroscopy experiment was performed to identify excited states in 62Ga 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 J π 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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Physical Review C, American Physical Society, 2015, 92 (2), pp.024315. 〈10.1103/PhysRevC.92.024315〉
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http://hal.in2p3.fr/in2p3-01188722
Contributeur : Michel Lion <>
Soumis le : lundi 31 août 2015 - 14:15:33
Dernière modification le : mercredi 4 avril 2018 - 07:58:02

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T. W. Henry, M. A. Bentley, R. M. Clark, P. J. Davies, V. M. Bader, et al.. Triplet energy differences and the low lying structure of $^{62}$Ga. Physical Review C, American Physical Society, 2015, 92 (2), pp.024315. 〈10.1103/PhysRevC.92.024315〉. 〈in2p3-01188722〉

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