(1) Nuclear Science Centre, Aruna Asaf Ali Marg, New Delhi 110 067, India, IN;(2) Department of Physics, University of Notre Dame, Notre Dame, IN 46 556, USA, US;(3) Department of Physics, University of Bombay, Mumbai 400 098, India, IN
Abstract:
High spins states in 99Rh were populated via the 66Zn(37Cl, 2p2n)99Rh reaction at an incident beam energy of 130 MeV. Seventeen new transitions have been observed in the present study and the
level scheme has now been extended up to a spin of J∼ 25ħ and an excitation energy of about Ex∼ 10 MeV. The observation of a positive parity E2 cascade based on the 9/2+ isomeric level is suggestive of collective behaviour in this nucleus up to high spins. Spherical shell model (within restricted
model space) and Cranked shell model calculations were performed to obtain an insight into the observed level structure. The
new collective band observed up to a spin of J∼ 25ħ is suggested to be based on (πg9/23) ⊗ (νg7/22) quasi-particle excitations.
Received: 12 July 1999 / Revised version: 14 September 1999