Nuclear Data Sheets for A=219

Abstract

Evaluated experimental structure and decay data are presented for 12 known nuclides of mass 219 (Pb, Bi, Po, At, Rn, Fr, Ra, Ac, Th, Pa, U, Np). Recommended values are given for level parameters, γ and α radiations, and other spectroscopic information. No excited states are known in 219Bi, 219Po, 219Pa, 219U and 219Np. Except for isotopic identification, no information about its half-life or decay characteristics is available for 219Pb. For 219Po, several γ rays have been reported from the decay of 219Bi β− decay, but no level scheme has been proposed. For 219At, only four excited states are known from α decay of 223Fr. For 219Rn and 219Fr, only the low-spin states are known from α decays of 223Ra and 223Ac, respectively. For 219Ra, 219Ac and 219Th, mainly the data for high-spin states are available from in-beam γ-ray studies. For 219Ra, high-spin data are available from 2017He15, 1992Wi02 and 1987Co36, but evaluators find significant differences in relative photon branchings between the three studies. Detailed comments are given in the Adopted dataset for this nuclide. Half-lives of excited states are known only for seven levels in 219Rn, thus there is a general lack of knowledge about γ-ray transition probabilities. This work supersedes data in the previous evaluations of A=219 published by 2001Br31, 1992Br10 and 1977Ma30.