β-DELAYED γ-RAY SPECTROSCOPY OF HEAVY NEUTRON RICH NUCLEI 'SOUTH' OF LEAD

摘要

Relativistic projectile fragmentation of a ~(208)Pb primary beam has been used to produce neutron-rich nuclei with proton-holes relative to the Z = 82 shell closure, i.e., "south" of Pb. β-delayed γ-ray spectroscopy allows to investigate the structural properties of such nuclei with A ～ 195 → 205. The current work presents transitions de-exciting excited states in ~(204)Au, which are the first spectroscopic information on this N = 125 isotone.