Physical Review C, Nuclear Physics
Author:
Keywords:
125-129Sn isomers, heavy-ion collisions, gamma-ray, relativistic U-fission, isomer lifetimes, transition-probabilities, yrast isomers, g-RISING, energy-levels, beta-decay, isotopes, nuclei, gsi, detectors, Science & Technology, Physical Sciences, Physics, Nuclear, Physics, GAMMA-RAY, TRANSITION-PROBABILITIES, NUCLEAR-STRUCTURE, YRAST ISOMERS, ENERGY-LEVELS, BETA-DECAY, DETECTORS, SN-119, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, 5106 Nuclear and plasma physics
Abstract:
New sub-mu s isomers have been observed in the neutron-rich Sn isotopes. Sn-125,Sn-127,Sn-129 nuclei have been produced in a relativistic fission reaction of U-238 on a Be-9 target at 750 A.MeV and by the fragmentation of Xe-136 at 600 A.MeV populating high-spin yrast states. In addition to the already known mu s isomers, three new ones with sub-mu s half-lives have been observed. These yrast isomers are the high-spin members of the nu(d(3/2)(-1)h(11/2)(-2)) and nu h(11/2)(-n), seniority v = 3 multiplets leading to isomeric (23/2(+)) and (27/2(-)) states, respectively. Added to the already known 19/2(+)mu s isomers in this region the current work completes the systematic information of neutron-hole excitations toward the filling of the last h(11/2) orbital at N = 82. The results are discussed in the framework of state-of-the-art shell-model calculations using realistic interactions.