E. Browne

Nuclear data sheets for A = 180

Abstract Spectroscopic data for all nuclei with mass number A=180 have been evaluated, and the corresponding level schemes from radioactive decay and reaction studies are presented. Salient topics of this evaluation are the new limit (0.023%) for the fractional population of 180 Hf (5.5 h) from 180 Lu, and the negative search for a possible 180 Lu isomer with a half-life between 10 s and 5 min. Both results may help in explaining the natural abundance of the long-lived 180 Ta isomer in terms of the slow (S) and/or the rapid (R) neutron capture processes of nucleosynthesis in stars.

Nuclear data sheets for A = 215,219,223,227

Abstract The evaluator presents in this publication spectroscopic data and level schemes from radioactive decay and nuclear reaction studies for all nuclei with mass numbers A=215, 219, 223, 227, and 231. Nuclei with mass number A=215 have spherical shape, and their nuclear structure have been interpreted in terms of the shell model. Nuclei with mass number A=219 belong to a transitional region with spherical, quadrupole, and possibly octupole deformations; those with mass numbers A=223 and 227 belong to a newly studied region of coexisting quadrupole with possible octupole deformations; and nuclei with mass number A=231 essentially have quadrupole deformation. Highlights of this publication are given below: A recent study of the 206 Pb( 13 C,4nγ) reaction (1998St24) has extended up to Jπ=61/2+ the previously known level scheme from 208 Pb( 13 C,6nγ) (1988Fu10,1983Lo16). This study has provided a new interpretation for all the spectroscopic data above the 2247--keV (Jπ=29/2--) level in 215 Ra. A new isotope, 219 U (42 μs), which was identified with the recoil separator VASSILISSA (1994Ye08,1994AnZY,1993An07), has been included in this evaluation. The first 223 Rn β-- decay scheme (1992Ku03) and a significantly improved measurement of 227 Ac α decay (1995Sh03) are presented here. A level scheme of 223 Fr has been constructed on the basis of these studies, where most of the levels below 600 keV have been assigned to parity doublet bands and interpreted in terms of the reflection--asymmetric rotor model. This evaluation includes the first level structures of 227 Fr and 227 Th. Levels in 227 Fr are from 227 Rn β-- decay (1997Ku20); those in 227 Th, are from 231 U α decay, from 227 Pa electron--capture decay, and from 226 Ra(α,3nγ) (1997Mu08,1995Li04,1998Ma83). A study of the β-- decay of a mass--separated source of 231 Fr has produced the first level scheme of 231 Ra (2001Fr05). The only published data (1994Br36,1996Le01) on the electron--capture decay of 231 U have provided much information on the level structure of 231 Pa. Studies on 232 Th(p,2nγ) and Coulomb Excitation of 231 Pa (1996Le01,1999Wu05), which have complemented the existing spectroscopic data from these reactions, have suggested the possibility of weak octupole correlations in 231 Pa. A new isotope of plutonium, 231 Pu (1999La14), has been included in this evaluation.

Nuclear Data Sheets for A=178*

Abstract Spectroscopic data for all nuclei with mass number A=178 have been evaluated, and the corresponding level schemes from radioactive decay and reaction studles are presented. This evaluation for A=178 supersedes the earlier one by L.R. Greenwood (74Gr45), published in Nuclear Data Sheets 13 , 549 (1974).

Nuclear data sheets for A = 179*

Abstract Spectroscopic data for all nuclei with mass number A=179 have been evaluated, and the corresponding level schemes from radioactive decay and reaction studies are presented. This evaluation for A=179 supersedes the earlier one by E. A. Henry (76He03), published in Nuclear Data Sheets 17 , 287 (1976).

Nuclear data sheets update for A = 210*

Abstract Evaluated spectroscopic data for all nuclei with mass number A=210, and corresponding level schemes from radioactive decay and reaction studies are presented. This evaluation supersedes the earlier one by B. Harmatz (81Ha54), published in Nuclear Data Sheets 34 , 735 (1981).

Nuclear data sheets update for A = 174*

Abstract Evaluated spectroscopic data for all nuclei with mass number A=174 and corresponding level schemes from radioactive decay and reaction studies are presented. This evaluation supersedes the earlier one by E. Browne (84Br21), published in Nuclear Data Sheets 41 , 511 (1984).

Nuclear data sheets for A = 185

Abstract Evaluated spectroscopic data for all nuclei with mass number A=185, and corresponding level schemes from radioactive decay and reaction studies, are presented. New experimental evidence indicates a possible coexistence of prolate and oblate nuclear shapes in the Au and Hg isotopes. This evaluation for A=185 supersedes the earlier one by Y. A. Ellis-Akovali (81E111). published in Nuclear Data Sheets 33, 557 (1981).

Nuclear Data Sheets for A = 163

Abstract Nuclear structure data for all nuclei with mass number A=163 have been evaluated. Adopted values for level properties and detailed level and decay schemes are presented for each nucleus, along with the experimental data upon which they are based. Theoretical (Hager-Seltzer) conversion coefficients for pure multipole transitions are presented without uncertainties. For mixed transitions, the stated conversion-coefficient uncertainties take into account the uncertainty of the mixing ratio as well as the uncertainties of the theoretical conversion coefficients for the pure multipole components (2% for M1, E2, and E1 transitions and 5% for all others).

Nuclear data sheets for A=191

Abstract Spectroscopic data for al nuclei with mass number A-191 have been evaluated, and the corresponding level schemes from radioactive decay and reaction studies are presented. This evaluation for A=191 supersedes the earlier one by E. Browne (80Br16), published in Nuclear Data Sheets 30, 653 (1980).

Nuclear Data Sheets update for A = 83*

Abstract Evaluated spectroscopic data for all nuclei with mass number A=83 and corresponding level schemes from radioactive decay and reaction studies are presented. This evaluation contains new extensive spectroscopic data on 83 Y, 83 Zr, and 83 Nb, from in—beam γ -ray measurements, which show rotational structure and suggest stable deformations for these nuclei. The present evaluation supersedes the earlier one by J. Muller (86Mu15), published in Nuclear Data Sheets 49 , 579 (1986).