DECAY SPECTROSCOPY OF ~(75-79)Cu, ~(79-81)Zn AND ~(83-85)Ga

摘要

The β-decay properties of neutron-rich fission fragments of Cu, Zn, and Ga isotopes were studied at the Holifield Radioactive Ion Beam Facility. Beams of ~(75-79)Cu, ~(79-81)Zn, and ~(83-85)Ga were formed and delivered to two new end-stations at the facility. The Low-energy Radioactive Ion Beam Spectroscopy Station is a traditional on-line low energy (200 keV) beam line with 4 clover Ge detectors, two half-cylindrical plastic β-detectors, and a moving tape collector. In addition, many of the beams were accelerated to above 2 MeV/u and delivered to a micro-channel plate and transmission ion chamber located just in front of the same detector setup. In both cases, fine adjustment of an isobar separator was used to enhance the isotope of interest. Excited levels in the daughters and β-delayed neutron branching ratios were measured and used to confirm isotope identification. The decays from ~(79)Cu and ~(85)Ga were observed for the first time as was the ~(84)Ge 2_1~+ level populated by β and βn decay channels.