A microscopic view of high-spin excitations in 90Zr

The spectral structure of 90Zr has been studied by carrying out a configuration-mixing shell-model calculation in a deformed basis using Ip3/2, 0f5/2, 1p12/, 0g9/2 model space. A modified Kuo-Brown effective interaction has been used. The band structure for the positive- and negative-parity states has been inferred through enhanced intraband E2 transitions as compared with the weak interband transitions. The present calculation describes fairly well the observed positive-parity states including the odd-J states as well as the negative-parity states. Many high-spin states and intraband E2 transition strengths have been predicted.