Beyond the N=50 shell closure: High-spin excitations of $^{87}$Kr and ground-state spin of $^{87}$Br
- Porquet, M.G.
- Venkova, T.
- Astier, A.
- Deloncle, I.
- Prévost, A.
- Azaiez, F.
- Buta, A.
- Curien, D.
- Dorvaux, O.
- Duchene, G.
- Gall, B.J.P.
- Khalfallah, F.
- Piqueras, I.
- Rousseau, Marc
- Meyer, M.
- Redon, N.
- Stezowski, O.
- Lucas, R.
- Bogachev, A.
Publication date
January 2006
DOI Publisher
Springer Science and Business Media LLCAbstract
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
Add to ORKG