1.Kepler Center for Astro and Particle Physics,Eberhard Karls Universit?t Tübingen,Tübingen,Germany;2.Institut für Radiochemie,Technische Universit?t München,Garching,Germany;3.Institut für Kernphysik,Universit?t zu K?ln,Cologne,Germany
Abstract:
The thermal neutron capture cross-sections of the 76Ge(n,)77Ge and the 76Ge(n,)77mGe reactions have been measured by activating targets of isotopically enriched GeO2 through cold neutrons. The -decay spectra after the -decay of 77Ge and 77mGe were measured with HPGe detectors. From these spectra the cross-sections for the 76Ge(n,) reactions were derived relative to the cross-section of 197Au using the absolute emission probabilities of the observed -ray energies. The methods used in this work result in smaller systematic uncertainties than those obtained in previous experiments.