Nuclear Structure Studies With Neutron-Rich RIBS At The HRIBf

摘要

The new neutron-rich radioactive ion beams available from the HRIBF allow an exciting variety of measurements around the ~(132)Sn region, including Coulomb excitation, fusion-evaporation, and neutron transfer. Experiments using these beams also provide an excellent training ground for developing techniques to be used at the future RIA facility. The B(E2;0~+ → 2+) value for first 2~+ excited states of neutron-rich (132,134,136)(Te) and ~(126, 128)(Sn) have been measured by inverse- kinematics Coulomb excitation. The B(E2) values obtained for ~(132,134)Te are in excellent agreement with expectations based on the systematics of heavy stable Te isotopes, while that for ~(136)Te is unexpectedly small. These results are discussed in terms of the shell model and the quasiparticle random phase approximation. Neutron transfer onto a ~(134)Te beam, from ~9Be and ~(13)C targets to populate single-particle states in ~(135)Te, has also been studied. Results, and plans for future experiments with these neutron-rich beams, are presented.