Decay of Pb201

R. E. Doebler, Wm. C. McHarris, and W. H. Kelly
Phys. Rev. C 20, 1112 – Published 1 September 1979
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Abstract

γ rays emitted in the decay of 9.4-h Pb201 were studied with Ge(Li) and NaI(Tl) detectors in singles, anti-Compton, anticoincidence, and integral coincidence configurations. The construction of a consistent decay scheme including 66 of the 74 γ rays observed in the decay of Pb201 was also aided by a two-dimensional γγ coincidence experiment of 4096 × 4096 channels using two Ge(Li) detectors. The proposed levels in Tl201 lie at 0, 331.15, 692.40, 1098.4, 1134.8, 1157.4, 1238.8, 1277.1, 1290.0, 1330.4, 1401.2, 1420.0, 1445.8, 1479.9, 1575.1, 1617.4, 1639.5, 1672.0, and 1755.3 keV with possible additional levels at 1550.5 and 1712.5 keV. Using existing conversion-electron data, conversion coefficients were calculated and multipolarity assignments proposed for 25 transitions. Based on these multipolarities, photon branching ratios, and logft values, unique spin and parity assignments have been made for several states and limits placed on others. The resulting decay scheme is compared with recent theoretical calculations of level energies and γ transition probabilities, using the intermediate-coupling unified model.

RADIOACTIVITY Pb201 [from Tl203(p,3n) and Tl203(He3,5n) Bi201εPb201]; measured Eγ, Iγ, αK, αL; deduced logft; Tl201 deduced levels, J, π; Ge(Li) singles and γγ coincidence.

  • Received 27 September 1978

DOI:https://doi.org/10.1103/PhysRevC.20.1112

©1979 American Physical Society

Authors & Affiliations

R. E. Doebler* and Wm. C. McHarris

  • Department of Chemistry, Cyclotron Laboratory, and Department of Physics, Michigan State University, East Lansing, Michigan 48824

W. H. Kelly

  • Cyclotron Laboratory and Department of Physics, Michigan State University, East Lansing, Michigan 48824

  • *Address while much of this paper was being written: Lawrence Berkeley Laboratory, Berkeley, CA. Present address: General Electric Co., San Jose, CA.

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Vol. 20, Iss. 3 — September 1979

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