Measurement of the shape factor for the β decay of O14

E. A. George, P. A. Voytas, G. W. Severin, and L. D. Knutson
Phys. Rev. C 90, 065501 – Published 3 December 2014

Abstract

We report results from an experiment designed to test the conserved vector current (CVC) hypothesis by measuring the shape of the β-decay spectrum for the allowed 0+1+ ground state decay of O14. Measurements of the spectrum intensity were obtained with a superconducting beta spectrometer and will be reported for positron kinetic energies ranging from 1.9 to 4.0 MeV. After dividing out phase space, Coulomb, and other correction factors, the resulting shape function has a negative slope of several percent per MeV. We define a parameter a, which is essentially a measure of the average slope of the shape function over the energy range of the measurements, and determine its value to be a=0.0290±0.0008 (stat.) ±0.0006 (syst.). The measured slope parameter is in good agreement with predictions from shell model calculations that respect CVC.

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  • Received 20 August 2014

DOI:https://doi.org/10.1103/PhysRevC.90.065501

©2014 American Physical Society

Authors & Affiliations

E. A. George and P. A. Voytas

  • Physics Department, Wittenberg University, Springfield, Ohio 45501, USA

G. W. Severin* and L. D. Knutson

  • Physics Department, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA

  • *Present address: The Hevesy Laboratory, Center for Nuclear Technologies, Technical University of Denmark, Frederiksborgvej 399, 4000 Roskilde, Denmark.
  • knutson@physics.wisc.edu

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Vol. 90, Iss. 6 — December 2014

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