Cross-shell Phenomena in Mass 36 Al and Si Isotopes Investigated via β-Decays

ORAL

Abstract

The β-decays of 36Mg and 36Al were studied at the National Superconducting Cyclotron Laboratory (NSCL) to extract the half-lives of the parent nuclei and reveal the nuclear structure of the decaying descendants. Neutron-rich 36Mg and 36Al were produced at the NSCL's Coupled Cyclotron Facility via projectile fragmentation of a 48Ca beam of energy 140 MeV/u impinged on a 642 mg/cm2 thick 9Be target. The fragmented beam was delivered to the decay station after being resolved by the A1900 separator. Two Si p-i-n detectors were used for the particle identification whereas the ions were implanted on a 3-mm thick CeBr3 scintilator. The β-delayed γ-rays were identified with 16 Ge (SeGA) and 15 LaBr3 detectors. The half-lives of the two parent nuclei were determined. β-delayed γ-ray transitions were observed in 36Al and 36Si for the first time. Excited energy states of 36Al populated by the β-decay of 36Mg are proposed, whereas only the ground state information was available prior to this work. The experimental results were interpreted by using the nuclear configuration interaction studies with the FSU shell-model Hamiltonian. The results will shed light on our understanding of the structure of more exotic neutron-rich nuclei to be produced with the next generation facilities like FRIB.

*This work was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Grant No DE-SC0020451 (FRIB), National Science Foundation under Grant No. PHY 1565546 (NSCL) and Contract No. PHY 1848177 (CAREER). Part of the work was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357 (ANL). The UML team was supported by the US Department of Energy, Office of Science, Office of Nuclear Physics under Grant No. DEFG02-94ER40848 (UML). Shell model calculations used the computational facilities of Florida State University supported by the Grant No. DE-SC0009883 (FSU).

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Presenters

  • Rebeka Sultana Lubna

    • FRIB
    • FRIB, MSU, USA
    • National Superconducting Cyclotron Laboratory, Facility for Rare Isotopes Beams, Michigan State University
    • Facility for Rare Isotope Beams, Michigan State University

Authors

  • Rebeka Sultana Lubna

    • FRIB
    • FRIB, MSU, USA
    • National Superconducting Cyclotron Laboratory, Facility for Rare Isotopes Beams, Michigan State University
    • Facility for Rare Isotope Beams, Michigan State University

  • Sean Liddick

    • FRIB/MSU
    • FRIB
    • National Superconducting Cyclotron Laboratory, Facility for Rare Isotopes Beams, Michigan State University

  • Aaron Chester

    • Michigan State University
    • Simon Fraser University

  • Benjamin P Crider

    • Mississippi State University
    • Texas A&M University

  • Timilehin H Ogunbeku

    • Facility for Rare Isotope Beams
    • Mississippi State University, Michigan State University
    • Mississippi State University

  • Katherine L Childers

    • Michigan State University
    • Texas A&M University

  • Partha Chowdhury

    • University of Massachusetts Lowell

  • Rebecca Lewis

    • Michigan State University
    • Zeno Power

  • Stephanie Lyons

    • Michigan State University

  • Shree K Neupane

    • University of Tennessee

  • David Perez-Loureiro

    • University of Tennessee
    • University of Tennessee, Knoxville

  • Christopher Prokop

    • Michigan State University
    • Los Alamos National Laboratory, Los Alamos

  • Andrea Richard

    • Michigan State University

  • Umesh M Silwal

    • Mississippi State University

  • Durga P Siwakoti

    • Mississippi State Univ

  • Dylan C Smith

    • Mississippi State University

  • Mallory Smith

    • Michigan State University
    • FRIB
    • SmithMa@frib.msu.edu

  • Alexander Volya

    • Florida State University

  • Yongchi Xiao

    • University of Kentucky
    • Michigan State University
    • Mississippi State University