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

Ts. Venkova; M.-G. Porquet; I. Deloncle; B.J.P. Gall; H. De Witte; P. Petkov; A. Bauchet; T. Kutsarova; E. Gueorgieva; J. Duprat; C. Gautherin; F. Hoellinger; R. Lucas; A. Minkova; N. Schulz; H. Sergolle; E.A. Stefanova; A. Wilson

doi:doi:10.1007/s100500050363

2021 Impact factor 3.131

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 $\pi$ g_9/2, $\pi$ p_1/2 and $\pi$ (g_7/2/d_5/2) 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