Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session ED: Mini-Symposium: The Structural Diversity of Nuclei in the Proximity of N=20 and 28 II
7:00 PM–8:45 PM,
Thursday, October 25, 2018
Hilton Room: Kohala 3
Chair: Michael D. Jones, University of North Carolina
Abstract ID: BAPS.2018.HAW.ED.3
Abstract: ED.00003 : Shell structure study on 43S via one-neutron knockout reaction
7:30 PM–7:45 PM
(University of Tokyo)
(University of Tokyo)
South of 48Ca in the nuclear chart, the erosion of the neutron magic number 28 has been observed.
Especially the ground-state deformation, the shape coexistence, and the high-K isomerism in 44S have been discussed both experimentally and theoretically.
These phenomena are thought to originate from the interplay of quenching the N = 28 shell gap and quadrupole excitations across Z = 14, 16 sub-shell and N = 28 shell gaps.
To clarify the reduction of the N = 28 shell gap and the role of the neutron configuration to the deformation in 44S, an in-beam γ-ray spectroscopic study focused on the one-neutron knockout reaction from 44S was performed.
The experiment was performed at the NSCL.
Prompt γ-rays from excited states in 43S were detected by the GRETINA tracking array.
In order to construct the level scheme above the isomeric state at 320 keV in 43S and population to this state for the deduction of the neutron configuration in the fp shell, the IsoTagger which consists of 32 CsI scintillators was placed downstream at the end of the beam line.
The level scheme and production cross section of each state of 43S, combined with the analysis on momentum distributions produced by this reaction, will be discussed by comparing with some shell model calculations.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.ED.3
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