Non-yrast level structures in the isotopes 131Pr and 131La

J. Genevey, A. Gizon, C. Foin, D. Bucurescu, Gh Cǎta-Danil, B. Weiss, D. Barnéoud, T. Von Egidy, J. Gizon, C. F. Liang, P. Paris

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Low-lying levels of 131Pr and 131La isotopes have been investigated by means of β/EC decays of 131Nd and 131Ce, respectively. The radioactive nuclei were produced in the 94Mo+40Ca reaction at a bombarding energy of 255 MeV and transported with a He-jet system. The identification and the characteristics of the 131mPr isomer (5.7 s) were obtained by applying both He-jet techniques and on-line gamma-ray spectroscopy with mechanically pulsed beams. γγt, Xγt, e-γt coincidence measurements as well as time multi-analysis were performed. Internal conversion electrons were recorded with a magnetic selector and multipolarities deduced. Level schemes of 131Pr and 131La are discussed and compared to those of neighboring odd-Z Pr and La isotopes using calculations made in the frame of the Interacting Boson-Fermion Model.

Original languageEnglish
Pages (from-to)247-269
Number of pages23
JournalNuclear Physics, Section A
Issue number2-3
StatePublished - 23 Dec 1996


  • Measured Eγ, Iγ, γγ-coin, Xγ-coin, eγ-coin, internal conversion electrons, T
  • Radioactivity Nd,Ce(EC),(β)


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