1. Beyond the N = 50 shell closure: High-spin excitations of 87Kr and ground-state spin of 87Br.
- Author
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Porquet, M., Venkova, Ts., Astier, A., Deloncle, I., Prévost, A., Azaiez, F., Buta, A., Curien, D., Dorvaux, O., Duchêne, G., Gall, B., Khalfallah, F., Piqueras, I., Rousseau, M., Meyer, M., Redon, N., Stézowski, O., Lucas, R., and Bogachev, A.
- Subjects
NUCLEAR shell theory ,NUCLEAR fission ,KRYPTON isotopes ,NUCLEAR physics ,FISSION gases - Abstract
The
87 Kr nucleus has been produced as fission fragment in the fusion reaction18 O +208 Pb 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 ν d5/2 , π p3/2 f5/2 and π g9/2 . Moreover, a revised spin value of 5/2- for the87 Br ground state is proposed. [ABSTRACT FROM AUTHOR]- Published
- 2006
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