Monday, July 22, 2013

1307.5177 (P. Ruotsalainen et al.)

Spectroscopy of proton-rich 66^Se up to J^π = 6^+: isospin-breaking
effect in the A = 66 isobaric triplet

P. Ruotsalainen, D. G. Jenkins, M. A. Bentley, K. Auranen, P. J. Davies, T. Grahn, P. T. Greenlees, J. Henderson, A. Herzáň, U. Jakobsson, P. Joshi, R. Julin, S. Juutinen, J. Konki, M. Leino, G. Lotay, A. J. Nichols, A. Obertelli, J. Pakarinen, J. Partanen, P. Peura, P. Rahkila, M. Sandzelius, J. Sarén, C. Scholey, J. Sorri, S. Stolze, J. Uusitalo, R. Wadsworth
Candidates for three excited states in the 66^Se have been identified using the recoil-{\beta} tagging method together with a veto detector for charged-particle evaporation channels. These results allow a comparison of mirror and triplet energy differences between analogue states across the A = 66 triplet as a function of angular momentum. The extracted triplet energy differences follow the negative trend observed in the f_7/2 shell. Shell-model calculations indicate a continued need for an additional isospin non-conserving interaction in addition to the Coulomb isotensor part as a function of mass.
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