Nuclear Data Sheets for A=201

Evaluated nuclear structure and decay data for all nuclei with mass number A=201 (²⁰¹Os, ²⁰¹Ir, ²⁰¹Pt, ²⁰¹Au, ²⁰¹Hg, ²⁰¹Tl, ²⁰¹Pb, ²⁰¹Bi, ²⁰¹Po, ²⁰¹At, ²⁰¹Rn, ²⁰¹Fr, ²⁰¹Ra) are presented. All available experimental data are compiled and evaluated, and best values for level and γ-ray energies, quantum numbers, lifetimes, γ-ray intensities and transition probabilities, as well as other nuclear properties, are recommended. Inconsistencies and discrepancies that exist in the literature are discussed. A number of computer codes (https://www-nds.iaea.org/public/ensdf_pgm/index.htm) developed by members of the NSDD network were used during the evaluation process. For example, the reported absolute γ-ray emission probabilities and their uncertainties in various decay data sets were determined using the GABS code. This work supersedes the earlier evaluation by F.G. Kondev (2007Ko06), published in Nuclear Data Sheets 108, 365 (2007).