The Yrast Spectroscopy of Neutron-Rich Nuclei Produced in Deep-Inelastic Processes

The highly sensitive GASP array at the INFN Legnaro Laboratory was used to study the γ-ray de-excitation of neutron-rich nuclei produced in the deep-inelastic processes which occur when 230MeV ³⁶S ions interact with a target of ¹⁷⁶Yb. Yrast decay schemes were identified in over forty target-like fragments and in over twenty projectile-like fragments. Extensions have been made to the yrast decay sequences of ¹⁷⁶Hf, ¹⁶⁶Er, ¹⁷²Yb, and ¹⁵²Sm in the target-like species. New transitions have also been observed in a number of projectile-like species including ³⁴P and ⁴¹Cl. The level structures of ³⁴P and ⁴¹Cl are compared with the results of shell-model calculations.