EVIDENCE FOR THE CONTRIBUTION OF OF 5/2,1P3/2 PROTON EXCITATIONS IN THE LOW-LYING STATES IN ZR-92,94

Lifetimes of T1/2=88(3) and 291(11) ps were measured for the 02+ states and T1/2=102(3) and 500(13) ps for the 41+ states in Zr92.94, respectively, using a recently developed - fast timing method. The observed B(E2) values and the recently measured g factors for the 21+ states in Zr92,94 deviate strongly from properties of a pure 1d5/2 multiplet and even from the (1p1/2,0g9/2)(1d5/2,2s1/ 2) shell-model results of Gloeckner. The experimental results are reproduced, however, by spherical shell model calculations with a model space of (0f5/2,1p3/2,1p1/2,0g9/2) (1d5/2,2s1/2,1d3/2,0g7/2) and provide compelling evidence for important contributions of f5/2,p3/2 orbits to the low-energy structure of these nuclei. © 1990 The American Physical Society.