Phys.Rev. C 102, 034325 (2020)

S.Momiyama, K.Wimmer, D.Bazin, J.Belarge, P.Bender, B.Elman, A.Gade, K.W.Kemper, N.Kitamura, B.Longfellow, E.Lunderberg, M.Niikura, S.Ota, P.Schrock, J.A.Tostevin, D.Weisshaar

Shell structure of ⁴³S and collapse of the N=28 shell closure

NUCLEAR REACTIONS ⁹Be(⁴⁴S, ⁴³S), E=93.7 MeV/nucleon, [⁴⁴S secondary beam from ⁹Be(⁴⁸Ca, X), E=140 MeV/nucleon primary reaction, followed by separation and identification of ⁴⁴S ions by A1900 separator and S800 spectrograph at the NSCL-MSU cyclotron facility]; measured reaction products, Eγ, Iγ, Doppler-corrected γ-ray spectrum using GRETINA array, delayed γ rays from the decay of isomeric states using IsoTagger consisting of 32 CsI(Na) detectors, (⁴³S)γ- and γγ-coin, parallel momentum distributions. ⁴³S; deduced levels, J, π, inclusive and exclusive cross sections for bound states, spectroscopic factors. Comparison with shell-model calculations using SDPF-U and SDPF-MU effective interactions. ⁴⁴S; deduced intruder configuration in the ground state and N=28 shell quenching from the removal of a 2p_3/2 neutron.

doi: 10.1103/PhysRevC.102.034325