Beta decay of neutron-rich Rh-116 and the low-lying level structure of even-even Pd-116 - art. no. 024309

Beta decay of neutron-rich Rh-116 has been studied at the IGISOL facility u sing beta-gamma and gamma-gamma coincidence spectroscopy. Online mass separ ated Rh-116 sources were produced by applying 25 MeV proton induced fission of natural uranium and the fission ion guide. Extended decay schemes have been constructed for the low- and high-spin states of Rh-116, respectively. Two excited 0(+) states in Pd-116 at 1109.8 and 1732.9 keV are proposed as the quasi-beta and intruder bandheads, respectively. New Pd-116 data suppo rt a different bandhead at 1809.9 keV for the recently reported negative-pa rity band. The systematics of low-lying collective and two-quasiparticle le vels in even Pd nuclei has been extended substantially. The behavior of the quasi-gamma band in Pd-116 reveals some deviation from a strict O(6) limit of the IBA model.