Journal
PHYSICS LETTERS B
Volume 726, Issue 4-5, Pages 665-669Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2013.09.054
Keywords
Isospin; N = Z; Levels; Shell-model; IBM-4
Funding
- STFC
- US Department of Energy, Office of Nuclear Physics [DE-AC02-O6CH11357]
- Science and Technology Facilities Council [ST/J00006X/1, ST/J003468/2, ST/J003468/1] Funding Source: researchfish
- STFC [ST/J003468/1, ST/J00006X/1, ST/J003468/2] Funding Source: UKRI
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New, low-lying levels in the odd-odd, N = Z nucleus Ga-62 have been identified using a sensitive technique, where in-beam gamma rays from short-lived nuclei are tagged with beta decays following recoil mass identification. A comparison of the results with shell-model and IBM-4 calculations demonstrates good agreement between theory and experiment, with the majority of predicted low-lying, low-spin T = 0 states now identified. There is a dramatic change in the level density at low excitation energies for the N = Z nucleus Ga-62 when compared with neighbouring odd-odd Ga isotopes where, in contrast, the low-lying level structure is dominated by configurations with T = 1 pairing interactions between excess neutrons. This illustrates the distinctively different aspects of nuclear structure exhibited by nuclei with N = Z. (C) 2013 Elsevier B.V. All rights reserved.
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