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High-spin excitations of 84 35Br49 and 85 35Br50: Mapping the proton sub-shells towards 78Ni |
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| Authors: | A Astier M -G Porquet 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 |
| 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 |
| Abstract: | The 84, 85Br nuclei have been produced as fission fragments in the fusion reaction 18O + 208Pb at 85MeV bombarding energy and studied with the Euroball IV array. The high-spin states of the odd-odd 84Br nucleus have been identified for the first time, the observed structure being built on the known 6- isomeric state. High-spin states of 85Br have been observed up to 5.4MeV excitation energy and spin I ∼ 21/2. From angular correlation analysis, spin values have been assigned to most of the 85Br excited states up to 4MeV. None of these excited states has been found to exhibit a delayed decay having T 1/2 > 10ns. All the observed states in 84, 85Br can be described by various proton excitations involving at least the two sub-shells ( πf 5/2 and πp 3/2) located just above the Z = 28 shell closure. |
| Keywords: | 21 60 Cs Shell model 23 20 Lv γ transitions and level energies 25 85 Ge Charged-particle-induced fission 27 50 +e 59 ⩽ A ⩽ 89 |
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