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.