Nuclear data sheets for A=181

The nuclear structure and the decay data for all the isobars of A=181 are presented in this evaluation. New levels of Hf-181 were studied by (n,gamma), (pol d, p), (d, p gamma) and (U-238, U-217'gamma) reactions. New levels of Ta-181 were studied by (p,n gamma), (p, d), Coulomb excitation and heavy ion reactions. Heavy ion reactions added information to high spin states of Re-181, Os-181 and Ir-181. In addition, Hg-181 and Tl-181 structures are also studied by a-decay experiments. The present evaluation supersedes the earlier one on A=181 by R. B. Firestone (1991Fi01), published in Nuclear Data Sheets 62, 101 (1991), and the ones on Pt-181, Au-181 and Hg-181, by C. M. Baglin, published in Nuclear Data Sheets 87, 197 (1999), 87, 225 (1999) and 87, 239 (1999).