Low-lying nuclear shape evolution from the dysprosium valence maximum to gamma-soft neutron-rich osmium isotopes

Full text of publication follows. This talk will present a range of experimental results studying the evolution of deformed nuclear shapes ranging from the valence maximum system, ¹⁷⁰Dy (Z=66, N=104) to heavy, neutron-rich osmium (Z=76) isotopes which have been carried out over the last five years. These rather exotic, neutron-rich nuclear systems have been investigated using (a) delayed gamma-ray spectroscopy following high-energy projectile-fission and fragmentation using the Cluster germanium gamma ray arrays RISING at GSI and EURICA at RIKEN and (b) coincidence fast-timing measurements of relevant B(E2: 2⁺ → 0⁺) decay rates using hybrid HPGe-LaBr₃(Ce) gamma-ray arrays at IFINHH, Romania. The wide range of experimental results are compared with competing theoretical predictions of nuclear shape using both mean-field calculations and extended IBM-style spectroscopic predictions which result. (author)