Total Absorption Spectroscopy of Ground and Isomeric States in <sup>70</sup>Cu

ORAL

Abstract

Theoretical models studying the origin of elements in the universe and stellar nucleosynthesis processes such the rapid neutron capture process (r-process), require physics information about beta-decay properties and neutron-capture reaction rates [1]. Currently quasiparticle random phase approximation (QRPA) calculations are used across the nuclear landscape to predict β-decay properties in astrophysical simulations [2]. QRPA calculations are typically bench-marked against known half-lives and β-delayed neutron emission probabilities, instead of comparing against the full distribution of β-decay feeding intensities (Iβ) as a function of excitation energy. Nuclei with larger β-decay Q-values have decay schemes with many weak de-excitation pathways to the ground state and β-decay branches, which are difficult to measure without high efficiency detectors. Here, we use the method of total absorption spectroscopy to investigate the β-decay of 70Cu which has three β-decaying spin-parity states (6− ground state, and two isomeric states: 3−, and 1+) and is thought to be produced in the weak r-process [3, 4]. In an experiment performed at the National Superconducting Cyclotron Laboratory 70Cu was produced, sent to the Low Energy Beam and Ion Trap (LEBIT) [5], and delivered to the Summing NaI (SuN) Total Absorption Spectrometer [6]. Spectra from the β-decay of each spin-parity state were isolated using different beam on/off periods. Iβ values from total absorption spectroscopy following the β-decay of each of the three β-decaying spin-parity states will be presented and compared to Shell Model and QRPA calculations.



[1] M. R. Mumpower, et al. Prog. in Particle and Nucl. Phys 86, (2016) 86-126.

[2] M. T. Mustonen and J. Engel. Phys. Rev. C 93 014304 (2016).

[3] P. Vingerhoets et al. Phys. Rev. C 82, 064311 (2010).

[4] R. Surman et al. AIP Advances 4, 041008 (2014).

[5] R. Ringle et al. Nucl. Inst and Meth Phys. Res. A 604 (2009) 3.

[6] A. Simon et al. Nucl. Inst and Meth. Phys. Res. A 703, (2013) 16.

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Presenters

  • Eleanor K Ronning

    • Michigan State University

Authors

  • Eleanor K Ronning

    • Michigan State University

  • Sean N Liddick

    • Michigan State University
    • FRIB
    • FRIB/NSCL
    • Facility for Rare Isotope Beams, Michigan State University, East Lansing, MI 48824, USA
    • FRIB/MSU

  • Andrea Richard

    • Lawrence Livermore National Laboratory

  • Artemis Spyrou

    • Michigan State University

  • Isaac T Yandow

    • Michigan State University

  • Ryan Ringle

    • Michigan State University
    • Facility for Rare Isotope Beams

  • B A Brown

    • Michigan State University

  • Aaron Chester

    • Michigan State University

  • Katherine L Childers

    • Michigan State University

  • Paul A Deyoung

    • Hope College
    • Department of Physics, Hope College

  • Gerard J Owens-Fryar

    • Michigan State University
    • Michgan State University
    • FRIB

  • Alec S Hamaker

    • Michigan State University

  • Caley Harris

    • Michigan State University

  • Rebecca Lewis

    • Michigan State University

  • Kasey R Lund

    • National Superconducting Cyclotron Laboratory, MSU

  • Stephanie M Lyons

    • Pacific Northwest National Laboratory

  • Alicia R Palmisano

    • University of Tennessee, Knoxville
    • UTK

  • Daniel Puentes

    • Michigan State University

  • Rachel Sandler

    • Central Michigan Univ

  • Chandana S Sumithrarachchi

    • Michigan State University
    • Facility for Rare Isotope Beams
    • MSU
    • FRIB/NSCL

  • Mathis Wiedeking

    • University of the Witwatersrand
    • iThemba labs

  • Yongchi Xiao

    • University of Kentucky
    • Mississippi State University