Lifetime of the singly charged ${}^{229}$Th nuclear isomer

Y. Shigekawa, A. Yamaguchi, K. Tokoi +6

The nucleus of thorium-229 (${}^{229}$Th) has an exceptionally low-energy isomeric state (${}^{229\mathrm{m}}$Th). Because its excitation energy is close to the energy levels of valenc…