Eur. Phys. J. A 15, 429-433 (2002)
DOI: 10.1140/epja/i2002-10090-0

Short Note

High-spin structure of the neutron-rich isotopes

Ts. Venkova¹, M.-G. Porquet², A. Astier³, A. Bauchet², I. Deloncle², S. Lalkovski^{2, 4}, N. Buforn³, L. Donadille⁵, O. Dorvaux⁶, B.J.P. Gall⁶, R. Lucas⁷, M. Meyer³, A. Minkova^{4, 2}, A. Prévost³, N. Redon³, N. Schulz⁶ and O. Stézowski<sup>3

1</sup>  INRNE, BAS, 1784 Sofia, Bulgaria
²  CSNSM IN2P3-CNRS and Université Paris-Sud, 91405 Orsay, France
³  IPNL, IN2P3-CNRS and Université Claude Bernard, 69622 Villeurbanne Cedex, France
⁴  Faculty of Physics, University of Sofia, 1126 Sofia, Bulgaria
⁵  School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, United Kingdom
⁶  IReS, IN2P3-CNRS and Université Louis Pasteur, 67037 Strasbourg, France
⁷  CEA/Saclay, DSM/DAPNIA/SPhN, 91191 Gif-sur-Yvette Cedex, France

porquet@csnsm.in2p3.fr

(Received: 15 July 2002 / Revised version: 8 October 2002 / Published online: 3 December 2002)

Abstract
The ^109,111,113Rh nuclei have been produced as fission fragments in the fusion reaction at 85 MeV. Their level schemes have been built from gamma-rays detected using the Euroball IV array. High-spin states of the neutron-rich ^111,113Rh nuclei have been identified for the first time. Several rotational bands with the odd proton occupying the , and ) sub-shells have been observed. A band of low-energy transitions has been identified at excitation energy around 2 MeV in ^109,111Rh, which can be interpreted in terms of three-quasiparticle excitation, . In addition another structure built on states located at low excitation energy (608 keV in ¹¹¹Rh, 570 keV in ¹¹³Rh) points out that, as already observed in the lighter isotopes ^107,109Rh, triaxial deformation plays a role in the neutron-rich Rh isotopes well beyond the mid-shell.

PACS
21.60.Ev - Collective models.
23.20.Lv - Gamma transitions and level energies.
25.85.Ge - Charged-particle-induced fission.
27.60.+j - .

© Società Italiana di Fisica, Springer-Verlag 2002