Phys.Rev. C 96, 044332 (2017)

B.Elman, A.Gade, D.Weisshaar, D.Barofsky, D.Bazin, P.C.Bender, M.Bowry, M.Hjorth-Jensen, K.W.Kemper, S.Lipschutz, E.Lunderberg, N.Sachmpazidi, N.Terpstra, W.B.Walters, A.Westerberg, S.J.Williams, K.Wimmer

Quadrupole collectivity beyond N = 50 in neutron-rich Se and Kr isotopes

NUCLEAR REACTIONS ²⁰⁹Bi(⁸⁸Kr, ⁸⁸Kr'), E=67 MeV/nucleon; ²⁰⁹Bi(⁹⁰Kr, ⁹⁰Kr'), E=68 MeV/nucleon; ²⁰⁹Bi(⁸⁶Se, ⁸⁶Se'), E=79 MeV/nucleon, [secondary ^88,90Kr, ⁸⁶Se beams from ⁹Be(⁹⁶Zr, X), E=120 MeV/nucleon using A1900 fragment separator at the NSCL-MSU Cyclotron Laboratory]; measured reaction products and particle identification plot, Doppler-corrected Eγ, Iγ, (particle)γ-coin, σ, using the CAESAR array of 192 CsI(Na) scintillators. ^88,90Kr, ⁸⁶Se; deduced levels, J, π, Coulomb excitation yields, B(E2) for excited 2+ states. Comparison with shell-model calculations. ^88,90Kr, ⁸⁶Se; calculated shell-model occupations of the proton and neutron orbitals for the observed levels. Systematics of B(E2) values for the first 2+ states in N=36-60 Kr and Se nuclei.

doi: 10.1103/PhysRevC.96.044332