https://doi.org/10.1140/epja/i2008-10631-5
Regular Article — Experimental Physics
Investigation of lifetimes in the dipole band of 139Sm
1
Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany
2
A.F. Ioffe Physical Technical Institute RAS, RU-194021, St. Petersbourg, Russia
3
Institut für Strahlen- und Kernphysik, University of Bonn, D-53115, Bonn, Germany
4
Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, BG-1784, Sofia, Bulgaria
5
Laboratori Nazionali di Legnaro, Istituto Nazionale di Fisica Nucleare, I-35020, Legnaro, Italy
6
Dipartimento di Fisica dell’Università, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131, Padova, Italy
7
Institut de Recherches Subatomique IReS, F-67037, Strasbourg, France
* e-mail: lieder@tlabs.ac.za
Received:
8
April
2008
Revised:
2
July
2008
Published online:
12
August
2008
Lifetimes have been measured for a dipole band in 139Sm using DSAM. The deduced B(M1) and B(E2) values as well as B(M1)/B(E2) ratios are compared with calculations in the framework of the TAC (Tilted Axis Cranking) and SPAC (Shears mechanism with Principal Axis Cranking) models. The dipole band in 139Sm can be considered as a magnetic rotational band with a prolate or triaxial nuclear deformation.
PACS: 21.10.-k Properties of nuclei; nuclear energy levels – / 21.10.Re Collective levels – / 21.10.Tg Lifetimes, widths – / 27.60.+j 90 ≤ A ≤ 149 –
© SIF, Springer-Verlag Berlin Heidelberg, 2008
