Bulletin of the American Physical Society
2021 Fall Meeting of the APS Division of Nuclear Physics
Volume 66, Number 8
Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time
Session MF: Nuclear Structure : A = 25-50
4:00 PM–5:48 PM,
Wednesday, October 13, 2021
Room: Berkeley & Clarendon
Chair: Erin Peters, U of Kentucky
Abstract: MF.00004 : Search for microsecond isomers at the dripline of the island of inversio*
4:36 PM–4:48 PM
Presenter:
James Christie
(University of Tennessee)
Authors:
James Christie
(University of Tennessee)
Zhengyu Xu
(University of Tennessee)
Robert Grzywacz
(University of Tennessee)
Miguel Madurga
(University of Tennessee)
Jesse N Farr
(University of Tennessee)
Donnie Hoskins
(University of Tennessee Knoxville)
Philipp Wagenknecht
(University of Tennessee)
Isidora Fletcher
(University of Tennessee)
Thomas T King
(University of Tennessee)
Shree K Neupane
(University of Tennessee)
Aaron Chester
(Michigan State University)
Joseph Heideman
(University of Tennessee)
Andrea L Richard
(Lawrence Livermore National Laboratory)
Kevin Siegl
(University of Tennessee)
James M Allmond
(Oak Ridge National Lab)
Rin N Yokoyama
(University of Tennessee)
Collaboration:
E19044 Collaboration
The island of inversion around 32Mg, characterized by tensor-force-driven deformation, has been well characterized in its north and west "shores". The south-eastern "beaches" offer intriguing physics where deformation and neutron dripline effects overlap, yet they remain poorly known due to the difficulty in producing them in experimental facilities. In particular, if normal ordering is restored at the dripline, low-energy opposite-parity intruders might be suppressed. This could be manifested in microsecond isomers between same parity states. In this talk I will present experimental work done at the National Superconducting Laboratory as a part of the E19044 collaboration. A 48Ca beam was fragmented to produce a cocktail beam of isotopes around Z=9, N=20 29F and separated by mass using the A1900 spectrometer. The cocktail beam was implanted in a YSO crystal, and the decay products were detected using 3 HPGe clovers for gamma rays and 48 VANDLE bars for beta delayed neutrons. A comprehensive search for microsecond isomers was performed on all Z>8 nuclei in the cocktail beam, using the delayed-gamma beta-correlation technique. Preliminary results will be presented.
*This research was sponsored in part by the Office of Nuclear Physics, U.S. Department of Energy under Award No. DE-FG02-96ER40983 (UTK) , and by the National Nuclear Security Administration under the Stewardship Science Academic Alliances program through DOE Award No. DE-NA0003899.
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