EPJ

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EPJ A - Hadrons and Nuclei
Hadrons and Nuclei


Eur. Phys. J. A 12, 309-316 (2001)

The $\chem{^{130}Nd\to{}^{130}Pr\to{}^{130}Ce}$ decay chain revisited

A. Gizon1, J. Genevey1, C.F. Liang2, P. Paris2, D. Barnéoud1, J. Inchaouh1, I. Penev3 and A. Plochocki4

1  Institut des Sciences Nucléaires, IN2P3-CNRS/Université Joseph Fourier, F-38026 Grenoble Cedex, France
2  CSNSM, IN2P3-CNRS, Bt 104, F-91405 Campus-Orsay, France
3  Institute for Nuclear Research and Nuclear Energy, 1784 Sofia, Bulgaria
4  Institute of Experimental Physics, 00-681 Warsaw, Poland

genevey@isn.in2p3.fr

(Received: 20 August 2001 / Revised version: 22 October 2001 Communicated by D. Schwalm)

Abstract
An investigation of low-lying energy levels of 130Pr and 130Ce has been made via $\beta$-decay. The radioactive parent nuclei were produced via 94,96Mo + 40Ca reactions at 6.8 MeV/nucleon and transported by a He-jet system. Gamma- $\gamma$-t, $\gamma$-X-t, $\gamma$-e --t coincidence measurements were performed. Internal conversion coefficients have been measured with a magnetic spectrometer. The new $\beta$-decay half-life of 130Nd has been determined to be 21(3) s. A partial level scheme of 130Pr at low-spin has been constructed. The $\beta$-decay of 130Pr to 130Ce suggests the existence of three $\beta$-instable isomeric states in 130Pr, while only one half-life T1/2 = 40(4) s has been measured. Based on the present work and low-lying excited states in neighbouring odd-mass nuclei, the spins and parities of isomeric states in 130Pr are proposed to be 2 +, (4,5) + and (7,8 $^\mp$). The ground state in 130Pr is still undetermined.

PACS
23.20.Lv - Gamma transitions and level energies.
23.20.Nx - Internal conversion and extranuclear effects.
27.60.+j - $90\leq A \leq 149$ .

© Società Italiana di Fisica, Springer-Verlag 2001

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