beta and beta-n decay of the neutron-rich Ge-84 nucleus

The β-decay properties of the very neutron-rich 84Ge nucleus were studied at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. Several new γ-transitions and levels were added to its decay scheme and the order of the two lowest-lying levels in the daughter 84As was corrected. For the first time γ radiation following β-delayed neutron emission was observed. The shell-model calculations and apparent β transition intensities were used to guide the spin assignment to the 84As levels, in particular for the low-energy part of the level scheme. The new spin-parity (2−) proposed for the ground state of 84As is supported also by the systematics of N=51 isotones.status: publishe

MULTI-PARTICLE EMISSION FROM Ar-31 AT ISOLDE

A multi-particle decay experiment was successfully performed at the ISOLDE Decay Station. In this new permanent station, devoted to β-decay studies, the novel MAGISOL Si-Plugin Chamber was installed to study the exotic decay modes of the proton drip-line nucleus 31Ar. The motivation was to search for β3p and β3pγ channels, as well as to provide information on resonances in 30S and 29P relevant for the astrophysical rp-process. Description of the experimental set-up and preliminary results are presented.status: publishe