High-spin excitations of the odd-odd 88 37Rb51 and 86 35Br51 nuclei: p3/2 d5/2 and f5/2 d5/2 residual interactions

M. -G. Porquet; A. Astier; Ts. Venkova; I. Deloncle; F. Azaiez; A. Buta; D. Curien; O. Dorvaux; G. Duchêne; B. J. P. Gall; F. Khalfallah; I. Piqueras; M. Rousseau; M. Meyer; N. Redon; O. Stézowski; R. Lucas; A. Bogachev

doi:10.1140/epja/i2008-10740-1

2022 Impact factor 2.7

Hadrons and Nuclei

Eur. Phys. J. A (2009) 40: 131-141
https://doi.org/10.1140/epja/i2008-10740-1

Regular Article - Experimental Physics

High-spin excitations of the odd-odd ⁸⁸ ₃₇Rb₅₁ and ⁸⁶ ₃₅Br₅₁ nuclei: p_3/2 d_5/2 and f_5/2 d_5/2 residual interactions

M. -G. Porquet¹^*, A. Astier¹, Ts. Venkova²^,1, I. Deloncle¹, F. Azaiez³^,a, A. Buta³, D. Curien³, O. Dorvaux³, G. Duchêne³, B. J. P. Gall³, F. Khalfallah³, I. Piqueras³, M. Rousseau³, M. Meyer⁴, N. Redon⁴, O. Stézowski⁴, R. Lucas⁵ and A. Bogachev⁶

¹ CSNSM, IN2P3-CNRS and Université Paris-Sud, 91405, Orsay, France
² INRNE, BAS, 1784, Sofia, Bulgaria
³ IPHC, IN2P3-CNRS and Université Louis Pasteur, 67037, Strasbourg Cedex 2, France
⁴ IPNL, IN2P3-CNRS and Université Claude Bernard, 69622, Villeurbanne Cedex, France
⁵ CEA/Saclay, DSM/DAPNIA/SPhN, 91191, Gif-sur-Yvette Cedex, France
⁶ JINR, Joliot-Curie 6, 142080, Dubna, Moscow region, Russia

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

Received: 3 November 2008
Revised: 21 January 2009
Accepted: 24 February 2009
Published online: 17 March 2009

Abstract

The odd-odd ⁸⁸ ₃₇Rb₅₁ and ⁸⁶ ₃₅Br₅₁ nuclei have been produced as fission fragments in the fusion reaction

¹⁸O$ + $²⁰⁸Pb

at 85MeV bombarding energy and studied with the Euroball IV array. Their high-spin level schemes have been built from the triple -ray coincidence data and - angular correlations have been analyzed in order to assign spin and parity values to many observed states. The proposed configurations involve proton excitations from three sub-shells located close to the Fermi levels, p _3/2 , f _5/2 , and g _9/2 , the d _5/2 neutron acting as a spectator. The residual interactions are extracted from the multiplets of states resulting from the p _3/2 d _5/2 and f _5/2 d _5/2 configurations. The empirical values of the latter are discussed and compared to those known in two similar configurations having j _p = j _n with l _p = l _n + 1 , where the role of the tensor force had been highlighted.