Lifetimes and g-factor measurements in the decay of the 399 keV isomeric state in Pt197 and the quasiparticle-phonon coupling model

J. C. Soares, A. A. Melo, F. B. Gil, R. N. Saxena, H. Dias, and F. Krmpotić
Phys. Rev. C 25, 1587 – Published 1 March 1982
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Abstract

The nuclear levels in Pt197 have been studied from the decay of 95.4 min Ptm197. The isomeric state was produced by (n,γ) reaction on the enriched Pt196. The γ-ray spectra have been observed with a hyperpure Ge detector and a large volume Ge(Li) detector. The half-lives of the 399 keV and the 53 keV states were determined with improved precision. The results are T12 (399 keV) =95.41±0.18 min and T12 (53 keV)=16.58±0.17 ns. The g factor of the 53 keV 52 state has been measured by the gamma-gamma time differential perturbed angular correlation method in an external magnetic field of 25.1 kG using the 346-53 keV gamma cascade. The value of the g factor was obtained to be +0.335±0.010. This result is compared with the known g factors of the similar states in Pt195, and in Hg197 and Hg199, and also with theoretical calculations based on the quasiparticle-phonon coupling scheme. The possibility of using the 346-53 keV gamma cascade in Pt197 in the future time differential perturbed angular correlation studies is discussed.

RADIOACTIVITY Ptm197 [from Pt196(n,γ)Ptm197]; measured Eγ, Iγ(t), γγ(t), γγ(θ,T,H), T12; deduced B(E2), μ; calculated B(E2), μ; Ge(Li), Ge hyperpure, NaI(T1) detectors. Enriched target.

  • Received 19 May 1981

DOI:https://doi.org/10.1103/PhysRevC.25.1587

©1982 American Physical Society

Authors & Affiliations

J. C. Soares, A. A. Melo, and F. B. Gil

  • Centro de Física Nuclear, Universidade de Lisboa, Lisboa, Portugal

R. N. Saxena

  • Instituto de Pesquisas Energéticas e Nucleares, São Paulo, Brasil

H. Dias

  • Centro Técnico Aeroespacial, Instituto de Atividades Espaciais, Divisão de Estudos Avançados, São José dos Campos—São Paulo, Brasil

F. Krmpotić*

  • Instituto de Física, Universidade de São Paulo, São Paulo, Brasil, and Universidad Nacional de La Plata, Argentina

  • *Present address: Universidad Nacional de La Plata, Facultad de Ciencias Exactas, Departamento de Física, La Plata, C.C. 67, Argentina.

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Vol. 25, Iss. 3 — March 1982

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