Shell model yrast states in the many-particle nucleus₇₂¹⁵⁷Hf₈₅

In-beam gamma gamma- and gamma gamma n- measurements have for the first time identified excited states in the Hf-157(72)85 nucleus and have established its yrast levels up to 6.5 MeV and I=(51/2). The results of parameter-free Ii-particle recoupling calculations in the framework of the shell model for the configurations pi h(11/2)(8)vf(7/2)(3) and pi h(11/2)(8)vf(7/2)(2)h(9/2) are in excellent agreement with the observed levels up to 39/2 at 4.758 MeV. A weakly populated 52 ns 29/2(+) yrast isomer st 2.876 MeV is assigned as the three-neutron configuration vf(7/2)h(9/2)i(13/2).