Structure of the nearly degenerate 6(1)(+) and 6(2)(+) states in Ti-48 - art. no. 057301

The 6(1)(+) and 6(2)(+) in Ti-48 form a nearly degenerate doublet. In singl e-j shell calculation with the matrix elements from experiment the 6(1)(+) changes sign under the interchange of protons and neutron holes (odd signat ure) while the 6(2)(+) does not (even signature). As a consequence the calc ulated B(E2) 6(1)(+)-->4(1)(+) is much stronger than the 6(2)(+)-->4(1)(+) and the Gamow-Teller matrix element to the 6(2)(+) states vanishes. When us ing some popular interaction, e.g., FPD 6 in single-j shell the ordering of the even signature and odd signature states gets reversed, so that the Gam ow-Teller matrix element to the 6(1)(+) state vanishes and the 6(2)(+)-->4( 1)(+) E2 transition is the strong one. When configuration mixing is introdu ced, the E2 transition 6(2)(+)-->4(1)(+) persists in being large. However t he Gamow-Teller strengths reverse, with the large matrix element to the 6(1 )(+) state in agreement with experiment. Static properties mu and Q for the two 6(+) states are also considered. The experimental B(E2)'s from the 6() states to the 4(1)(+) state are not well known.