Short-LivedαEmitters of Thorium: New IsotopesTh218−220

Abstract

The $\alpha$-decay energies and half-lives of three new thorium isotopes, ${}_{}{}^{218-220}{}_{}{}^{}\mathrm{Th}$, have been measured by a simple recoil technique. The observed $\alpha$-decay widths are in qualitative agreement with Mang's shell-model theory.