2019 Impact factor 2.176
Hadrons and Nuclei
Eur. Phys. J. A 6, 405-413

High-spin structure of the neutron-rich $^{107,109}_{\phantom{107,1}45}$Rh isotopes:
the role of triaxiality

Ts. Venkova1 - M.-G. Porquet2 - I. Deloncle2 - B.J.P. Gall3 - H. De Witte2 - P. Petkov1 - A. Bauchet2 - T. Kutsarova1 - E. Gueorgieva4 - J. Duprat5 - C. Gautherin6 - F. Hoellinger3 - R. Lucas6 - A. Minkova4 - N. Schulz3 - H. Sergolle5 - E.A. Stefanova1 - A. Wilson2

1 INRNE, BAN, 1784 Sofia, Bulgaria
2 CSNSM, IN2P3/CNRS and Université Paris-Sud, 91405 Orsay Campus, France
3 IReS, IN2P3/CNRS and Université Louis Pasteur, 67037 Strasbourg Cedex 2, France
4 University of Sofia, Faculty of Physics, 1126 Sofia, Bulgaria
5 IPN, IN2P3/CNRS and Université Paris-Sud, 91406 Orsay, France
6 DAPNIA/SPhN, CEA Saclay, 91191 Gif-sur-Yvette, France

Received: 1 September 1999 Communicated by D. Schwalm

Abstract
The 107,109Rh nuclei have been produced as fission fragments following the fusion reaction 28Si + 176Yb at 145 MeV bombarding energy and studied with the Eurogam2 array. In both nuclei three new rotational bands with the odd proton occupying the $\pi$g9/2, $\pi$p1/2 and $\pi$(g7/2/d5/2) sub-shells have been observed. In 107Rh, two other bands involving strong M1 transitions have been identified at excitation energy larger than 2 MeV. They can be interpreted in terms of three quasiparticle excitations. In addition new structures consisting of four transitions, built on states located at low excitation energy (680 keV in 107Rh and 642 keV in 109Rh), point out the importance of triaxial deformation in these two isotopes.

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


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