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    [PDF]

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.

View original: http://arxiv.org/abs/1307.5177