Eur. Phys. J. A 36, 21-29 (2008)
DOI: 10.1140/epja/i2008-10570-1

Transition to non-collective states at high spin in ¹²⁴Xe

A. Al-Khatib¹, H. Hübel¹, P. Bringel¹, C. Engelhardt¹, A. Neußer-Neffgen¹, G. B. Hagemann², C. R. Hansen², B. Herskind², G. Sletten², A. Bracco³, F. Camera³, G. Benzoni⁴, P. Fallon⁵, R. M. Clark⁵, M. P. Carpenter⁶, R. V. F. Janssens⁶, T. L. Khoo⁶, T. Lauritsen⁶, P. Chowdhury⁶, H. Amro⁷, A. K. Singh⁸ and R. Bengtsson<sup>9

1</sup>  Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Nußallee 14-16, D-53115, Bonn, Germany
²  Niels Bohr Institute, Blegdamsvej 17, DK-2100, Copenhagen, Denmark
³  Dipartimento di Fisica, Università di Milano and INFN, I-20133, Milano, Italy
⁴  INFN, Sezione di Milano, I-20133, Milano, Italy
⁵  Lawrence Berkeley National Laboratory, 94720, Berkeley, CA, USA
⁶  Argonne National Laboratory, 60439, Argonne, IL, USA
⁷  Yale University, New Haven, CT, USA
⁸  Indian Institute of Technology, IN-721302, Kharagpur, India
⁹  Lund Institute of Technology, Lund, Sweden

hubel@hiskp.uni-bonn.de

(Received 21 February 2008 / Published online 23 April 2008)

Abstract

Excited states in ¹²⁴Xe were populated in the reaction ⁸²Se(⁴⁸Ca, 6n)¹²⁴Xe and γ -ray coincidence relationships were measured with the Gammasphere spectrometer. Two new bands are observed and several of the previously known bands are extended in the high- as well as in the low-spin region. Two irregular high-spin structures are also added. The irregularities are a fingerprint of a transition from collective to non-collective behaviour. Configuration assignments to the new structures are proposed on the basis of systematics and by comparing experimental properties with calculations within the framework of the cranking model.

PACS
21.60.-n - Nuclear structure models and methods.
23.20.Lv - γ transitions and level energies.
27.60.+j - 90 ≤ A ≤ 149.

Communicated by C. Signorini

© Società Italiana di Fisica, Springer-Verlag 2008