Accurate Masses and β-Decay Schemes for P34 and Si33

D. R. Goosman, C. N. Davids, and D. E. Alburger
Phys. Rev. C 8, 1324 – Published 1 October 1973
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Abstract

By using delayed βγ coincidence techniques, the mass excesses of P34 and Si33 have been measured to be -24 546 ± 45 and -20 569 ± 50 keV, respectively, representing improvements in precision of a factor of 2 for P34 and a factor of 4 for Si33 over previous measurements. The first measurements of the high-energy γ rays from P34 decay with a Ge(Li) detector are presented, revealing three new β branches. γ-ray energies (in keV) and relative intensities for the S34 daughter transitions are 1787 ± 1 (0.30 ± 0.10), 1947.1 ± 1.5 (0.28 ± 0.10), 1987.2 ± 1.0 (1.0 ± 0.2), 2127.4 (100.0 ± 0.3), 4073.4 ± 1.5 (0.46 ± 0.06), and 4114.0 ± 1.5 (1.2 ± 0.2). The S34 excitation energies and relative β branches are 2127.4 (100 ± 0.3), 3303.7 (<0.26), 3914.2 (0.30 ± 0.10), 4073.0 (0.76 ± 0.12), and 4114.5 (2.2 ± 0.3). For the decay of Si33, energies and relative intensities of γ rays were measured to be 415.8 ± 0.6 (6.7 ± 0.6), 1431.4 (13.1 ± 1.0), 1847.5 (100 ± 1), and 2537.5 (9.3 ± 0.8), representing excitation energies and relative β-ray intensities to the P33 daughter states of 1431.4 (5.12.4+1.0), 1847.5 (1002.8+1.0), and 2537.6 (10.5 ± 1.0). The half-lives of P34 and Si33 were determined by multiscaling γ-ray yields to be 12.45 ± 0.10 and 6.11 ± 0.21 sec, respectively. Combined with an earlier result, a half-life of 6.18 ± 0.18 sec is adopted for Si33. The transverse mass relationship of Garvey, using the present measurements for P34 and Si33, predicts a mass excess of -20 251 ± 90 keV for the Tz=3 nuclide Si34.

  • Received 18 June 1973

DOI:https://doi.org/10.1103/PhysRevC.8.1324

©1973 American Physical Society

Authors & Affiliations

D. R. Goosman

  • Brookhaven National Laboratory, Upton, New York 11973

C. N. Davids*

  • Center for Nuclear Studies, University of Texas at Austin, Texas 78712
  • Brookhaven National Laboratory, Upton, New York 11973

D. E. Alburger

  • Brookhaven National Laboratory, Upton, New York 11973

  • *Alfred P. Sloan Foundation Fellow.

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Issue

Vol. 8, Iss. 4 — October 1973

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