New Spectroscopy of Heavy Neutron Rich Nuclei: Isomeric Studies Following Relativistic Fragmentation

摘要

Gamma spectroscopy methods have been used to search for microsecond isomers among fragmentation products of 1 GeV/nucleon ~(208)Pb beam. Decays of several known K-isomers in the rare earth region of A approx 180 were observed, including the K = 35/2 isomer in ~(179)W. Several new isomeric decays in the very neutron rich systems, such as ~(199)W, have been identified. In addition, in the course of this work, a number of neutron rich rare earth isotopes have also been synthesised and identified for the first time.