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- Title
Beyond the N = 50 shell closure: High-spin excitations of <sup>87</sup>Kr and ground-state spin of <sup>87</sup>Br.
- Authors
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.; Bogachev, A.
- 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.
- Subjects
NUCLEAR shell theory; NUCLEAR fission; KRYPTON isotopes; NUCLEAR physics; FISSION gases
- Publication
European Physical Journal A -- Hadrons & Nuclei, 2006, Vol 28, Issue 2, p153
- ISSN
1434-6001
- Publication type
Article
- DOI
10.1140/epja/i2006-10050-8