90Y in the core-coupling model

Gamma-ray spectroscopy of87Y

“…The positive parity states, however, decay primarily by E2 transitions, and only the stretched states are strongly populated. A calculation of the level structure of 89y by the core-coupling model [26] predicts that the energies of the states of the [9/2| + ] configuration increase with increasing spin, so that M1 transitions would dominate the decay of these states. This is the decay pattern which is indeed observed in 89y [5].…”

Neutron effective single-particle energies above Ni78 : A hint from lifetime measurements in the N=51 isotones

“…Compared with Ref. [39], we obtain slight improvements for the overall level-scheme pattern (particularly for the 9/2 + 1 state and the high-lying weakly stripping 1/2 + states) but very similar spectroscopic factors. In addition, we provide information on the expected lifetimes for these states.…”

“…Overall, the agreement is far better than simply qualitative, as was already the case in Ref. [39], although in that work no information was provided on lifetimes. Compared with Ref.…”

“…In the present case, we restrict these calculations only to odd systems. In particular, our calculations should be seen as an attempt to verify whether the results obtained by HoffmannPinther and Adams for the 89 Sr case [39] can be extended to lighter N = 51 isotones 87 Kr and 85 Se. We recall here only some of the calculation ingredients which are the most relevant for the present discussion.…”

“…We note for the sake of completeness that, to limit the number of parameters to a strict minimum, and contrary to Ref. [39], we excluded the excitations with the 3 − core state in the calculations. Moreover, existence of octupole excitations in the 84 Se core is not as well established as it is in the 88 Sr and 86 Kr cores.…”