gamma gamma angular-correlation analysis of Hg-200 after cold-neutron capture

We report on a gamma gamma angular-correlation experiment investigating Hg-200 after cold-neutron capture. The experiment was performed using eight high-purity germanium detectors mounted on an array installed at the PF1B neutron beam line of the research reactor of the Institut Laue-Langevin in Grenoble, France. The geometry of the array allows gamma gamma angular-correlation analyses that can be used for the determination of level spins and multipole mixing ratios in Hg-200. We present multipole mixing ratios for secondary gamma rays and investigate the nature of the Hg-200 neutron-capture state by analyzing the observed primary gamma rays of this nucleus

Precise measurement of energies in Sn-115 following the (n,gamma) reaction

The first measurement of. rays from the Sn-114(n,gamma) reaction using cold neutrons, performed with an array of Ge detectors at the PF1B facility of the Institute Laue-Langevin in Grenoble, has provided the most accurate energy, Q(beta) = 173(12) eV, of beta(-) decay of the In-115 ground state to the first excited state in Sn-115. This is the lowest of all such energies in the known nuclear landscape. The accuracy of the neutron binding energy of Sn-115 and the mass of Sn-114 have been improved