Spectroscopy on the proton drip-line: Probing the structure dependence of isospin nonconserving interactions

J. Henderson, D. G. Jenkins, K. Kaneko, P. Ruotsalainen, P. Sarriguren, K. Auranen, M. A. Bentley, P. J. Davies, A. Görgen, T. Grahn, P. T. Greenlees, A. Hay, T. W. Henry, A. Herzáň, U. Jakobsson, R. Julin, S. Juutinen, J. Konki, M. Leino, C. McPeakeS. Milne, A. J. Nichols, J. Pakarinen, P. Papadakis, J. Partanen, P. Peura, P. Rahkila, E. Sahin, M. Sandzelius, J. Sarén, C. Scholey, M. Siciliano, L. Sinclair, J. Sorri, S. Stolze, J. Uusitalo, R. Wadsworth, M. Zielińska

Research output: Contribution to journalArticlepeer-review

Abstract

The recoil-β tagging technique was used to identify transitions associated with the decay of the 2+ and, tentatively, the 4+ excited states in Sr74. Combining these results with published data for the A=74 isobars, triplet energy differences (TEDs) have been extracted, the heaviest case for which these values have been evaluated. State-of-the-art shell-model calculations using the JUN45 interaction and incorporating a J=0 isospin nonconserving (INC) interaction with an isotensor strength of 100 keV can reproduce the trend in the TED data, with particularly good agreement for the 2+ state. This agreement for the TED data taken together with the fact that agreement has also been shown between shell-model calculations with the same strength of INC interaction in the f7/2 shell and recently for A=66 strongly suggests that such an interaction exists throughout the nuclear chart and cannot have a strong dependence on details of nuclear structure such as which nuclear orbitals are occupied. It also supports the hypothesis that only a J=0 component of the INC interaction need be included to explain the observed TEDs.

Original languageEnglish
Article number051303
Number of pages4
JournalPhysical Review C (Nuclear Physics)
Volume90
Issue number5
DOIs
Publication statusPublished - 18 Nov 2014

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