Beyond the N=50 shell closure: High-spin excitations of $^{87}$Kr and ground-state spin of $^{87}$Br - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles European Physical Journal A Year : 2006

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

T. Venkova
  • Function : Author
D. Curien
G. Duchene
B.J.P. Gall
A. Bogachev
  • Function : Author

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.

Dates and versions

in2p3-00089316 , version 1 (17-08-2006)

Identifiers

Cite

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, 2006, 28, pp.153-159. ⟨10.1140/epja/i2006-10050-8⟩. ⟨in2p3-00089316⟩
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