How far from stability can we go using Gammasphere and the FMA?

Abstract

This paper presents new results obtained using the U.S. national gamma-ray facility Gammasphere, which has been operating at the ATLAS accelerator at Argonne National Laboratory since January 1998. Gammasphere was built at Lawrence Berkeley Laboratory and used primarily as a powerful spectrometer for studying nuclei at the highest spins [1].

Core Excitations Across the Neutron Shell Gap in ^{<span class="cmr-7">207</span>}Tl

“…The HPGe detectors were Compton suppressed using bismuth germanate (BGO) detectors. The GAMMASPHERE array has an energy resolution of < 2.4 keV at 1.33 MeV, with a photopeak efficiency of ∼ 10% for the same energy [2]. Tantalum, cadmium and copper absorbers were placed between the HPGe detectors and the target chamber in order to reduce the yield of characteristic x-ray peaks.…”