High-spin excitations of the odd-odd 88
37Rb51 and 86
35Br51 nuclei: \pip3/2
\nud5/2 and \pif5/2
\nud5/2 residual interactions |
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Authors: | 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 |
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Institution: | 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
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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 $ \gamma$ -ray coincidence data and $ \gamma$ - $ \gamma$ 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, $ \pi$ p 3/2 , $ \pi$ f 5/2 , and $ \pi$ g 9/2 , the $ \nu$ d 5/2 neutron acting as a spectator. The residual $ \pi$ $ \nu$ interactions are extracted from the multiplets of states resulting from the $ \pi$ p 3/2 $ \nu$ d 5/2 and $ \pi$ f 5/2 $ \nu$ 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. |
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