Lifetime of the 961 keV 1-level in152Sm

Abstract

With a152mEuO3 source and a Sm2O3scatter er, nuclear y-ray resonance scattering and resonance fluorescence self-absorption experiments were performed to determine the lifetime of the 961 keV 1-level in152Sm. The value obtained from scattering , (8±2) x 10-14s, is larger than that determined from self absorption , (4.7±0.5) x 10-14s; this could be due to in ade­quate know ledge about the slowing down of the source nuclei before the emission of the y-ray. From a comparison of these values, a mean free path of 0.6 x 10-8cm for the source nucleus recoiling after electron capture in152Eu2O3has been calculated.