Abstract
The results of the first spectroscopic studies of delayed neutron and γ emission following the β decay of and are reported. Nuclides were produced by fragmenting an 80 MeV/nucleon beam in a 546 mg/cm thick Be target and were separated at high velocities with the A1200 fragment separator. The nuclides were implanted in a thin plastic scintillator at the center of an array of neutron scintillators to determine the neutron time-of-flight spectrum. Two hyperpure germanium detectors were used to observe coincident γ events. The β––, and β––γ coincidence spectra were analyzed to obtain the energies of the states populated in , , and following the β decay. Eight new neutron energies with a total neutron emission probability of 41.8(9)%, six γ transitions among the excited states of , and four γ transitions among the excited states of were identified in the β decay. Seven new neutron energies with a total neutron emission probability of 42.9(14)%, ten γ transitions among the excited states of , and two γ transitions among the exited states of were observed from the β decay. Half-lives of 336(3) and 136(3) ms were determined for the and decays, respectively. The branching ratios of both decays were deduced and compared with USD (universal sd-shell) shell model calculations. The β decay schemes for and were deduced.
9 More- Received 9 May 2006
DOI:https://doi.org/10.1103/PhysRevC.74.024322
©2006 American Physical Society