Nuclear Data Sheets for A=93

Nuclear structure data pertaining to all nuclei with mass number A=93 (Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag) have been compiled and evaluated and incorporated into the ENSDF data file. This publication for A=93 supersedes the previous publication by C.M. Baglin, Nuclear Data Sheets 80, 1 (1997) (literature cutoff date November 1996) and subsequent revisions by C.M. Baglin of the ENSDF files for Br-93 and Kr-93 (literature cutoff 26 February 2001) and for Rh-93 (literature cutoff 27 February 2001); it includes all data available prior to 15 December 2010. Significant changes since prior evaluations include the following: 2010Hw03 identified several high-spin states in Kr-93 in Cf-252 SF decay; in addition to the many low-spin levels already known in Rb-93 from beta(-) decay, several higher-spin states have now been identified in a Cf-252 SF decay study (2009Hw03); this SF decay has also been used to identify additional states in Sr-93 (2003Hw01) and the U-238(Se-82,X gamma) reaction (2007Bu35) has provided new information on Y-93. (HI,xn gamma) reaction studies have expanded our knowledge of the structure of Zr-93 (2002Fo03,2005Pa48), Nb-93 (2007Wa45), Mo-93 (2005Fu01), Tc-93 (2003Ha22) and Pd-93 (2004So04,2004Ru02). Considerable information on Nb-93 was provided by a (p,2n gamma) study (2010Or01,2006Or09,2007Or01). The level schemes of Ru-93, Rh-93 and Pd-93 have undergone the most extensive revision thanks to studies of Rh-93 epsilon decay (2004De40), Ag-94 epsilon p decay (2004Mu30) and Ag-94 p decay (2005Mu15, 2005Mu30), respectively. The half-life of the Zr member of this chain is of particular interest because of Zr-93's large contribution to long-term activity of nuclear reactor waste and also due to its potential as a supernova chronometer. During 2010, two new well-documented measurements of T-1/2(Zr-93) were published (2010Ya01 and 2010Ca01); one agrees well with an earlier, undocumented measurement but, unfortunately, the other is many standard deviations lower for reasons which are not immediately apparent.