# Beyond the N=50 shell closure: High-spin excitations of $^{87}$Kr and ground-state spin of $^{87}$Br

Abstract : The Kr-87 nucleus has been produced as fission fragment in the fusion reaction O-18+Pb-208 at 85 MeV 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 6.3 MeV excitation energy and spin I similar to 23/2 (h) over bar. 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 nu d(5/2), pi p(3/2)f(5/2) and pi g(9/2). Moreover, a revised spin value of 5/2(-) for the Br-87 ground state is proposed.
Mots-clés :
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00089316
Contributor : Yvette Heyd Connect in order to contact the contributor
Submitted on : Thursday, August 17, 2006 - 11:51:16 AM
Last modification on : Sunday, June 26, 2022 - 11:46:11 AM

### Citation

M.G. Porquet, T. Venkova, A. Astier, I. Deloncle, A. Prévost, et al.. Beyond the N=50 shell closure: High-spin excitations of $^{87}$Kr and ground-state spin of $^{87}$Br. European Physical Journal A, EDP Sciences, 2006, 28, pp.153-159. ⟨10.1140/epja/i2006-10050-8⟩. ⟨in2p3-00089316⟩

Record views