Nuclear Data Sheets for A = 187
- Nuclear Science Division, Lawrence Berkeley Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (United States)
Evaluated spectroscopic data and level schemes from radioactive decay and nuclear reaction studies are presented for {sup 187}Hf, {sup 187}Ta, {sup 187}W, {sup 187}Re, {sup 187}Os, {sup 187}Ir, {sup 187}Pt, {sup 187}Au, {sup 187}Hg, {sup 187}Tl, {sup 187}Pb, {sup 187}Bi, and {sup 187}Po. This evaluation for A = 187 supersedes the earlier one by R.B. Firestone (1991Fi02) published in Nuclear Data Sheets 62, 159 (1991) and the {sup 187}Tl evaluation by C.M. Baglin (1999Ba24) published in Nuclear Data Sheets 86, 487 (1999). Highlights of this publication are the following: This evaluation includes first identifications of {sup 187}Hf, {sup 187}Ta (1999Be63, 2000PoZY) and {sup 187}Po (2006An11) nuclides. A B(E2){up_arrow} = 0.080 12 was determined by 1967Bi10 for the 9/2+ state at 845 keV in {sup 187}Re Coulomb Excitation. Using this B(E2) value and the adopted 845{gamma} ray properties, a T{sub 1/2}=54 fs 34 can be deduced for the 845 keV level of {sup 187}Re. This T{sub 1/2} yields a large B(E2)(W.u.){approx}1.3x105 for the 263{gamma} (depopulating the same level) indicating either substantial unobserved feeding or incorrect g-ray branching intensities of this level. The decay of g.s. and isomer of {sup 187}Tl are poorly known (please see {sup 187}Tl {epsilon} decay (51 s+15.60 s)). Based on {sup 191}Po {alpha} decay studies, 2002An19 establishes a {sup 187}Pb isomeric level energy at 2(15) keV and assigns J{pi}=13/2+ for the {sup 187}Pb g.s. and J{pi}=3/2- for the isomeric state (inverse of the systematics of odd-mass Pb nuclei in this region). From {sup 187}Pb and {sup 187}Pb{sup m} mass measurements, 2005We11 determined the isomeric level energy at 33(13) keV.
- OSTI ID:
- 21282073
- Journal Information:
- Nuclear Data Sheets, Vol. 110, Issue 5; Other Information: DOI: 10.1016/j.nds.2009.04.001; PII: S0090-3752(09)00030-1; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0090-3752
- Country of Publication:
- United States
- Language:
- English
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