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Open Access Publications from the University of California

Nuclear Data Sheets for A=164

  • Author(s): Singh, B
  • Chen, J
  • et al.

© 2018 Elsevier Inc. Experimental nuclear structure data for the known A=164 isobaric nuclides (Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Re, Os, Ir) have been evaluated, and presented together with Adopted properties of level energies, and associated γ rays. The decay data for these nuclides have also been evaluated, providing Adopted values of γ and β radiations, and log ft values. No excited states are known in164Eu,164Tb, and164Ir. Information for164Gd,164Re and164Os is limited due to insufficient experimental data. For radioactive nuclides, decay schemes of164Sm,164Gd and164Re are not known, and those of164W,164Tb,164Lu,164Hf,164Ta and164W are incomplete. The decay schemes of164Ho and the two activities of164Tm seem fairly complete. The decay scheme of164Yb presents a major problem that the Q(ε) value of 887 keV 29 recommended in 2017Wa10 is in disagreement with the population of levels at 928, 952 and 1060 keV in the daughter nucleus. This decay scheme, which so far has been mainly reported in a secondary reference (1982AdZZ) needs further investigation. Also the masses of164Yb and164Tm need either new measurements or a re-evaluation to resolve discrepancy of about 220 keV in the Q value of164Yb decay to164Tm. The reactions and decays for which no new experimental information has become available since the 2001 update have undergone revisions to incorporate conversion coefficients from BrIcc code, and evaluated Q values from 2017Wa10, but the essential content of such datasets may have remained the same as in previous evaluations. In this respect the present work greatly benefited from all the previous NDS evaluations (2001Si27,1992Sh07, 1986Sh03,1974Bu30), but at the same time data presented herein supersede all the previous published evaluations.

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