Eur. Phys. J. A 12, 309-316 (2001)
The
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
-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-
-t,
-X-t,
-e
--t coincidence measurements were
performed. Internal conversion coefficients have been measured with a
magnetic spectrometer. The new
-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
-decay of
130Pr to
130Ce suggests the existence of three
-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
). The ground state in
130Pr is
still undetermined.
23.20.Lv - Gamma transitions and level energies.
23.20.Nx - Internal conversion and extranuclear effects.
27.60.+j -

© Società Italiana di Fisica, Springer-Verlag 2001