High-spin structure of the neutron-rich 44 104,106,108 Ru isotopes: γ-vibrational bands and two-quasiparticle excitations

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

doi:10.1007/s10050-000-4508-8

2022 Impact factor 2.7

Hadrons and Nuclei

Eur. Phys. J. A (2000) 8: 177-185
https://doi.org/10.1007/s10050-000-4508-8

High-spin structure of the neutron-rich ₄₄ ^104,106,108 Ru isotopes: γ-vibrational bands and two-quasiparticle excitations

I. Deloncle¹^*, A. Bauchet¹, M. -G. Porquet¹, M. Girod², S. Péru², J. -P. Delaroche², A. Wilson¹^,a, B. J. P. Gall³, F. Hoellinger³, N. Schulz³, E. Gueorguieva⁴, A. Minkova⁴, T. Kutsarova⁵, Ts. Venkova⁵, J. Duprat⁶, H. Sergolle⁶, C. Gautherin⁷, R. Lucas⁷, A. Astier⁸, N. Buforn⁸, M. Meyer⁸, S. Perriès⁸ and N. Redon⁸

¹ CSNSM, IN2P3/CNRS and Université Paris-Sud, 91405, Orsay Campus, France
² CEA/DIF, DPTA/SPN, 91680, Bruyères-le-Châtel, France
³ IReS, IN2P3/CNRS and Université Louis Pasteur, 67037, Strasbourg Cedex 2, France
⁴ Faculty of Physics, University of Sofia, 1126, Sofia, Bulgaria
⁵ INRNE, BAS, 1784, Sofia, Bulgaria
⁶ IPN, IN2P3/CNRS and Université Paris-Sud, 91406, Orsay, France
⁷ DAPNIA/SPhN, CEA Saclay, 91191, Gif-sur-Yvette, France
⁸ IPNL, IN2P3/CNRS and Université Lyon-1, 69622, Villeurbanne, France

^* e-mail: deloncle@csnsm.in2p3.fr

Received: 9 March 2000
Revised: 23 May 2000
Published online: 11 September 2013

Abstract

The ^104,106,108Ru nuclei have been produced as fission fragments following the fusion reaction ²⁸Si + ¹⁷⁶Yb at 145 MeV bombarding energy; prompt gamma rays emitted in the reaction were detected using the Eurogam II array. Their high-spin level schemes have been obtained, particularly several side bands have been extended or newly observed. Experimental results are discussed in the framework of both collective model and the rotating mean-field approach in which the Gogny force is the sole input. These calculations provide very good descriptions of both low-spin and high-spin structures observed in the neutron-rich even-A Ru isotopes.

PACS: 21.60.Ev Collective models – / 21.60.Jz Hartree-Fock approximation – / 23.20.Lv Gamma transitions and level energies – / 25.85.Ge Charged-particle-induced fission – / 27.60.+j 90 ≤ A ≤ 149 –

Present address: Department of Physics, University of York, York, Y01 5DD, UK

© Società Italiana di Fisica and Springer-Verlag, 2000