Search for microsecond isomers at the dripline of the island of inversio

ORAL

Abstract



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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Presenters

  • James Christie

    • University of Tennessee
    • University of Tennessee Knoxville

Authors

  • James Christie

    • University of Tennessee
    • University of Tennessee Knoxville

  • Zhengyu Xu

    • University of Tennessee
    • University of Tennessee, Knoxville

  • Robert Grzywacz

    • University of Tennessee
    • University of Tennessee and Oak Ridge National Lab
    • University of Tennessee, Knoxville

  • Miguel Madurga

    • University of Tennessee
    • University of Tennessee, Knoxville

  • Jesse N Farr

    • University of Tennessee
    • University of Tennessee Knoxville

  • Donnie Hoskins

    • University of Tennessee Knoxville

  • Philipp Wagenknecht

    • University of Tennessee
    • University of Tennessee Knoxville
    • University of Tennessee, Knoxville

  • Isidora Fletcher

    • University of Tennessee
    • University of Tennessee Knoxville

  • Thomas T King

    • University of Tennessee
    • Oak Ridge National Laboratory
    • Oak Ridge National Lab

  • Shree K Neupane

    • University of Tennessee
    • University of Tennessee, Knoxville

  • Aaron Chester

    • Michigan State University
    • National Superconducting Cyclotron Laboratory

  • Joseph Heideman

    • University of Tennessee
    • University of Tennessee, Knoxville

  • Andrea L Richard

    • Lawrence Livermore Natl Lab
    • National Superconducting Cyclotron Labor
    • Lawrence Livermore National Laboratory

  • Kevin Siegl

    • University of Tennessee
    • University of Tennessee, Knoxville

  • James M Allmond

    • Oak Ridge National Lab

  • Rin N Yokoyama

    • University of Tennessee