2019 Impact factor 2.176
Hadrons and Nuclei
Eur. Phys. J. A 15, 429-433 (2002)
DOI: 10.1140/epja/i2002-10090-0

Short Note

High-spin structure of the neutron-rich $\chem{^{109,111,113}_{\qquad\quad 45}Rh}$ isotopes

Ts. Venkova1, M.-G. Porquet2, A. Astier3, A. Bauchet2, I. Deloncle2, S. Lalkovski2, 4, N. Buforn3, L. Donadille5, O. Dorvaux6, B.J.P. Gall6, R. Lucas7, M. Meyer3, A. Minkova4, 2, A. Prévost3, N. Redon3, N. Schulz6 and O. Stézowski3

1  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 $\chem{^{18}O+{}^{208}Pb}$ 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 $\pi g_{9/2}$, $\pi p_{1/2}$ and $\pi(g_{7/2}/d_{5/2}$) 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, $\pi g_{9/2}~\nu h_{11/2}~\nu g_{7/2}/d_{5/2}$. 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 - $90 \leq A \leq 149$ .

© Società Italiana di Fisica, Springer-Verlag 2002