Evidence for deformation in $^{113-116}$Cd isotopes

N. Buforn; A. Astier; J. Meyer; M. Meyer; S. Perriès; N. Redon; O. Stézowski; M.G. Porquet; I. Deloncle; A. Bauchet; J. Duprat; B.J.P. Gall; C. Gautherin; E. Gueorguieva; F. Hoellinger; T. Kutsarova; R. Lucas; A. Minkova; N. Schulz; H. Sergolle; Ts. Venkova; A.N. Wilson

doi:doi:10.1007/PL00013614

2022 Impact factor 2.7

Hadrons and Nuclei

Eur. Phys. J. A 7, 347-353

Evidence for deformation in ^113-116Cd isotopes

N. Buforn¹ - A. Astier¹ - J. Meyer¹ - M. Meyer¹ - S. Perriès¹ - N. Redon¹ - O. Stézowski¹ - M.G. Porquet² - I. Deloncle² - A. Bauchet² - J. Duprat³ - B.J.P. Gall⁴ - C. Gautherin⁵ - E. Gueorguieva⁶ - F. Hoellinger⁴ - T. Kutsarova⁷ - R. Lucas⁵ - A. Minkova⁶ - N. Schulz⁴ - H. Sergolle³ - Ts. Venkova⁷ - A.N. Wilson²

¹ IPN Lyon, IN2P3/CNRS, Univ. Lyon-1, 69622 Villeurbanne Cedex, France
² CSNSM Orsay, IN2P3/CNRS, Univ. Paris-Sud, 91405 Orsay Campus, France
³ IPN Orsay, IN2P3/CNRS, Univ. Paris-Sud, 91406 Orsay, France
⁴ IReS Strasbourg, IN2P3/CNRS, Univ. Louis Pasteur, 67037 Strasbourg, France
⁵ CEA/Saclay, DAPNIA/SPhN, 91191 Gif-sur-Yvette, France
⁶ University of Sofia, Faculty of Physics, 1126 Sofia, Bulgaria
⁷ INRNE, BAN, 1784 Sofia, Bulgaria

Received: 21 December 1999 / Revised version: 16 February 2000 Communicated by B. Herskind

Abstract
High-spin states in ^113-116Cd have been investigated with the fusion-fission reaction ²⁸Si + ¹⁷⁶Yb at 145 $\>$ MeV. The experiment has been performed with the Eurogam2 array. New rotational bands based on two quasi-particle states have been observed for even-even cadmium isotopes. A new level scheme based on the 11/2^- isomeric state is proposed for ¹¹⁵Cd and the one of ¹¹³Cd has been extended to spin (31/2^-). The decoupled bands identified in both odd-A nuclei are interpreted as being built upon a low- $\Omega$ h_11/2 quasi-neutron configuration. Microscopic Hartree-Fock + BCS calculations confirm the prolate deformation in this mass region especially for the odd cadmium isotopes.

PACS
21.60.Ev Collective models - 21.60.Jz Hartree-Fock - 23.20.Lv Gamma transitions and level energies - 25.70.Jj Fusion and fusion-fission reactions - 27.60.+j $90 \leq A \leq 149$