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

J Henderson (1) , D.G. Jenkins (1) , K Kaneko (1) , P Ruotsalainen (2) , P Sarriguren (3) , K Auranen (2) , M A Bentley (1) , P. J. Davies (1) , A Görgen (4) , T Grahn (2) , P. T. Greenlees (2) , A Hay (5) , T.W. Henry (1) , A Herzáň (2) , U Jakobsson (2) , R Julin (2) , S Juutinen (2) , J Konki (2) , M Leino (2) , C Mcpeake (6) , S Milne (1) , A.J. Nichols (1) , J Pakarinen (2) , P Papadakis (2) , J Partanen (2) , P Peura (2) , P Rahkila (2) , E Sahin (4) , M Sandzelius (2) , J Sarén (2) , C Scholey (2) , M Siciliano (2) , L Sinclair (1) , J Sorri (2) , S Stolze (2) , J Uusitalo (2) , R Wadsworth (1) , M. Zielinska (7)

1 Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
2 JYU - Department of Physics [Jyväskylä Univ]
3 Instituto de Estructura de la Materia, CSIC, Serrano 123, E-28006 Madrid, Spain
4 Department of Physics [Oslo]
5 Ichthyology, Australian Museum
6 University of Liverpool
7 DPHN - Département de Physique Nucléaire (ex SPhN)

The recoil-β tagging technique was used to identify transitions associated with the decay of the 2 + and, tentatively, the 4 + excited states in 74 Sr. 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 f 7/2 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.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

J Henderson, D.G. Jenkins, K Kaneko, P Ruotsalainen, P Sarriguren, et al.. Spectroscopy on the proton drip-line: Probing the structure dependence of isospin nonconserving interactions. Physical Review C, 2014, 90, pp.51303. ⟨10.1103/PhysRevC.90.051303⟩. ⟨hal-01108726⟩