High-lying, non-yrast shell structure in 52Ti

The level structure of 52Ti was studied following fusion-evaporation and incomplete-fusion reactions. As a result, an extensive level scheme is now available for high-lying, non-yrast states in this nucleus. The newly-established level sequence provides further tests of full pf-shell calculations with the GXPF1A interaction. With only 2 protons and 2 neutrons outside the double-magic nucleus 48Ca, 52Ti can be described very well by the shell-model calculations without the need for a larger model space. In addition, the observed high-energy gamma transitions at high spin are attribued to the N=32 shell gap in neutron-rich Ti isotopes, which reflects the large energy separation between the neutron p3/2 and p1/2 orbitals due to the weakening of the attractive monopole interaction beween the proton f7/2 and the neutron f5/2 orbitals.