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

J. Genevey,A. Gizon,C. Foin,D. Bucurescu, G. Căta-Danil,B. Weiss,D. Barnéoud,T. von Egidy,J. Gizon,C. F. Liang, P. Paris

Nuclear Physics A（1996）

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摘要

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.

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关键词

Nd-131, Ce-131(EC), (beta(+)), measured E gamma, I gamma, gamma gamma-coin, X gamma-coin, e(-)gamma-coin, internal conversion electrons, T-1/2, deduced log ft, Pr-131 and La-131 deduced levels, J, pi, He-jet transport, Ge-detectors, magnetic selector, Si(Li) detector, Pr-131, La-131, Calculated levels, Interacting Boson-Fermion Model

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