L. G. R. Emediato

Shape transition in odd-odd A ≈ 130 nuclei

Abstract A systematic analysis of rotational bands in doubly odd nuclei in the mass region A = 130–140 is carried out using a shell model configuration mixing approach. The shell model (many-body) basis is constructed by projecting out deformed quasiparticle (Nilsson + BCS) states onto good angular momenta. The hamiltonian is assumed to be a sum of (spherical) single-particle hamiltonian and a schematic two-body interaction, which consists of Q · Q + (monopole) pairing + quadrupole-pairing forces. The analysis indicates a shape transition from prolate ( N = 73) to oblate ( N = 79) shape as a function of neutron number. Agreement between theoretical results and experimental data is quite satisfactory except for γ-deformed nuclei ( N = 75 and 77).

Nuclear structure in odd-odd nucleus 138 Pr

With the view of extending the systematics of odd-odd Pr nuclei toward the N=82 closed shell, high-spin states in 138Pr nucleus have been investigated with the 128Te(14N, 4nγ) reaction. Configurations and spin assignments are suggested for three of the observed band-structures.