https://doi.org/10.1140/epja/i2010-10979-9
Regular Article - Experimental Physics
Quenching of the E1 strength in 149Nd
1
The Andrzej Sołtan Institute for Nuclear Studies, 05-400, Świerk, Poland
2
Department of Nuclear and Particle Physics, Uppsala University, P.O. Box 535, S-75121, Uppsala, Sweden
3
Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681, Warsaw, Poland
4
Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315, Oslo, Norway
5
Grupo de Física Nuclear, Universidad Complutence, E28040, Madrid, Spain
6
St. Petersburg Nuclear Physics Institute, 188350, Gatchina, St. Petersburg, Russia
* e-mail: ewa@ipj.gov.pl
Received:
12
January
2010
Revised:
12
April
2010
Accepted:
29
April
2010
Published online:
22
May
2010
Lifetime measurements of excited states in 149Nd have been performed using the advanced time-delayed
(t) method. Half-lives of 14 excited states in 149Nd have been determined for the first time or measured with higher precision. Twelve new
-lines and 5 new levels have been introduced into the decay scheme of 149Pr based on results of the
coincidence measurements. Reduced transition probabilities have been determined for 40
-transitions in 149Nd . Configuration assignments for 6 rotational bands in 149Nd are proposed. Enhanced E1 transitions indicate that the ground-state band and the band built on the 332.9keV level constitute a pair of the
parity doublet bands. Potential energy surfaces on the
-plane have been calculated for the lowest single quasi-particle configurations in 149Nd using the Strutinski method and the axially deformed Woods-Saxon potential. The predicted occurrence of the octupole-deformed K = 5/2 configuration is in agreement with experiment. Unexpectedly low
values obtained for the
parity doublet bands may result from cancellation between the proton and neutron shell correction contributions to
.
© SIF, Springer-Verlag Berlin Heidelberg, 2010