NEW 0(+) STATES IN SM-146 FROM A (P,T) EXPERIMENT AND THE PARTICLE-CORE COUPLING MODEL

摘要

The reaction Sm-148(p,t) Sm-146 was studied at E(p) = 26 MeV, Fifty-six excited states in the final N = 84 nucleus were observed below E(exc) = 4.2 MeV and their angular distributions were measured at 8 angles, Spin and parity assignments are made for 37 of them, based on the determination of the transferred angular momentum L. Ten excited J(pi) = 0(+) states were identified, The emerging excitation energies of the J(pi) = 0(+) states and the monopole strength distribution in Sm-146 are compared with those observed in nearby nuclei and with results of calculations done in the framework of the Particle-Core Coupling Model. The main features of the experimental results are interpreted using a superposition of two types of configurations: two-particle states coupled to the collective excitations of the N = 82 core and two holes coupled to the collective excitations of the N = 86 core. Calculations show also that two-phononxtwo-particle configurations are spread over many states and their identification becomes difficult. [References: 41]