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Beyond the N = 50 shell closure: High-spin excitations of 87Kr and ground-state spin of 87Br |
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| Authors: | M. -G. Porquet Ts. Venkova A. Astier I. Deloncle A. Prévost 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 |
| Affiliation: | (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 87Kr nucleus has been produced as fission fragment in the fusion reaction 18O + 208Pb at 85MeV bombarding energy and studied with the Euroball IV array. High-spin states of this neutron-rich isotope have been identified for the first time. Its level scheme has been obtained up to 6.3MeV excitation energy and spin I ∼ 23/2ℏ. Its structure is interpreted by analogy with those of the heavier isotones. The proposed configurations involve both proton and neutron excitations from several sub-shells located close to the Fermi levels, particularly νd5/2, πp3/2f5/2 and πg9/2. Moreover, a revised spin value of 5/2- for the 87Br ground state is proposed. |
| Keywords: | 21.60.Cs Shell model 23.20.Lv Gamma transitions and level energies 25.85.Ge Charged-particle-induced fission 27.50.+e 59 ⩽ A ⩽ 89 |
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