Nuclear Data Sheets for A=186

Abstract

Evaluated spectroscopic data and level schemes from radioactive decay and nuclear reaction studies are presented for ¹⁸⁶Lu, ¹⁸⁶Hf, ¹⁸⁶Ta, ¹⁸⁶W, ¹⁸⁶Re, ¹⁸⁶Os, ¹⁸⁶Ir, ¹⁸⁶Pt, ¹⁸⁶Au, ¹⁸⁶Hg, ¹⁸⁶Tl, ¹⁸⁶Pb, ¹⁸⁶Bi, and ¹⁸⁶Po. This evaluation for A=186 supersedes the earlier evaluation 2003Ba44 by C. M. Baglin. Highlights of this evaluation are the following: ¹⁸⁶Re: Revised %ε and %β⁻ branches. New values are almost same as of the earlier ones. Adopted improved level energy for the long-lived (8⁺) isomer at 148.2 keV 5 based on the study reported in 2015Ma60 (¹⁸⁷Re(n, 2nγ)) compared to 149 keV 7 in previous evaluation (2003Ba44). ¹⁸⁶Hg: Discrepancies in the level schemes between 1992Po01 and 1993Ma02 remain to resolve experimentally, arise primarily due to the assigned multipolarity of the ≈607 keV γ transition between the 1228 keV bandhead and the 2⁺ 621 keV level. See general comments in Adopted Levels, Gammas dataset. ¹⁸⁶Tl: From α decay studies, 2020St11 propose spin-parity (2⁻) for the g.s. and (7⁺) for the excited level at 0.0+x of level energy of 77 keV 56. From mass measurements, 2014Bo26 propose the (7⁻) level energy of 20 keV 40 earlier.