Nuclear Data Sheets for A = 184

Abstract

Nuclear structure and decay data for all nuclei with mass number A=184 (Lu, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl, Pb, Bi) have been evaluated, and the corresponding level schemes from radioactive decay and reaction studies are presented. This evaluation supersedes the previous publication (R.B. Firestone, Nuclear Data Sheets 58, 243 (1989) (literature cutoff date 1 June 1989)) and subsequent revisions of high spin data for several nuclides by Huo Junde (31 July, 1995) and evaluations by C.M. Baglin for 184Au, 184Pb and the new nuclide 184Bi (literature cutoff dates 4 April 2003, 28 July 2003 and 21 January 2004, respectively). The present evaluation includes literature available by 1 October 2009. Subsequent to those evaluations, (HI, xn γ) studies have contributed significantly to our knowledge of the structure of 184Re (2005Wh04), 184Os (2002Sh21, 2002Wh01, 1998Sh36), 184Hg (1995De30, 1995Sf01) and 184Au (2004Zh38). Additional information on the level structure of 184W has become available from new thermal neutron capture measurements (2003Bo52, 2004Lo22, 2007ChZX), from detailed ( p , t ) reaction studies (2006Me25), new Coulomb excitation (1991Wu05) and ( γ , γ ′ ) (1993He15) studies, and from the 198Pt( 136Xe,X γ) reaction (2004Wh02); knowledge of 184Pt has benefited from a new 184Au ε decay study (2006KrZT, 1992Xu02, 1992Xu06, 1992XuZY), but this decay cannot yet be normalized due to the mixed parentage of the sources used.