Total Absorption Spectroscopy of Ground and Isomeric States in 70Cu

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