Estimation of radiative half-life of ${}^{229m}$Th by half-life measurement of other nuclear excited states in ${}^{229}$Th

Y. Shigekawa, A. Yamaguchi, K. Suzuki +8

We perform coincidence measurements between $\alpha$ particles and $\gamma$ rays from a ${}^{233}$U source to determine the half-lives of the excited state in a ${}^{229}$Th nucleus. We first pr…