Yrast structure of Zr97 and β decay of the 27/2- high-spin isomer in Y97

Abstract

The yrast structure of the neutron-rich nucleus 97 Zr has been studied using fission of targetlike products in the reaction of a 48 Ca beam on a thick 238 U target. The level scheme, known from previous studies up to an excitation energy and spin-parity of approximately 4619 keV and 23/2 - , has been extended by about 3 MeV and a few units of angular momentum. Two states fed in the β decay of the 27/2- high-spin isomer in 97 Y were identified at 5570 and 5606 keV. The located level structure can be discussed in terms of shell-model configurations.