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
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NUCLEAR shell theory , *NUCLEAR fission , *KRYPTON isotopes , *NUCLEAR physics , *FISSION gases - 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 ν d 5/2, π p 3/2 f 5/2 and π g 9/2. Moreover, a revised spin value of 5/2- for the 87Br ground state is proposed. [ABSTRACT FROM AUTHOR]
- Published
- 2006
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