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Article Dans Une Revue Journal de Physique Année : 1973

Nuclear levels of 228Th populated in the decay of 228Pa

W. Kurcewicz
  • Fonction : Auteur
K. Stryczniewicz
  • Fonction : Auteur
J. Zylicz
  • Fonction : Auteur
R. Broda
  • Fonction : Auteur
S. Chojnacki
  • Fonction : Auteur
W. Walus
  • Fonction : Auteur
I. Yutlandov
  • Fonction : Auteur

Résumé

, — The decay of 228Pa to the levels of 228Th has been extensively studied by various techniques. Single spectra of γ-and K X-rays have been measured with Si(Li) and Ge(Li) detectors. A set of two Ge(Li) detectors has been used to study γ-y and γ-K X-ray coincidences. Measurements of γ-spectra in coincidence with the selected internal-conversion lines have been carried out using a Ge(Li) detector and a six-gap magnetic β-spectrometer. Finally, spectra of internal-conversion electrons have been studied in a β-spectrometer which uses a Si(Li) detector placed together with a system of diaphragms in a homogeneous magnetic field. The decay scheme has been constructed including 39 levels of 228Th. It accounts for 111 of 160 transitions ascribed to the 228Pa activity. The electron-capture decay energy has been determined to be 2 103 /+16 /-12 keV. The strength distribution for the electron-capture feeding of the 228Th levels is analysed in terms of nuclear models. The Coriolis mixing of four octupole bands (K = 0, 1, 2 and 3) is studied in some detail. The coupling matrix elements deduced from the experiment are compared with the results of the microscopic-model calculations.
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Dates et versions

jpa-00207367 , version 1 (04-02-2008)

Identifiants

Citer

W. Kurcewicz, K. Stryczniewicz, J. Zylicz, R. Broda, S. Chojnacki, et al.. Nuclear levels of 228Th populated in the decay of 228Pa. Journal de Physique, 1973, 34 (2-3), pp.159-174. ⟨10.1051/jphys:01973003402-3015900⟩. ⟨jpa-00207367⟩

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