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Decay of negative muons bound in Al27

A. Grossheim1,*, R. Bayes1,†, J. F. Bueno2, P. Depommier3, W. Faszer1, M. C. Fujiwara1,‡, C. A. Gagliardi4, D. R. Gill1, P. Gumplinger1 et al. (TWIST Collaboration)

P. Gumplinger1, M. D. Hasinoff2, R. S. Henderson1, A. Hillairet1,†, J. Hu1, D. D. Koetke5, G. M. Marshall1, E. L. Mathie6, R. E. Mischke1, K. Olchanski1, A. Olin1,†, R. Openshaw1, J.-M. Poutissou1, R. Poutissou1, V. Selivanov7, G. Sheffer1, B. Shin1,§, T. D. S. Stanislaus5, R. Tacik6, and R. E. Tribble4 (TWIST Collaboration)

  • 1TRIUMF, Vancouver, British Columbia, V6T 2A3, Canada
  • 2University of British Columbia, Vancouver, British Columbia, V6T 1Z1, Canada
  • 3University of Montreal, Montreal, Quebec, H3C 3J7, Canada
  • 4Texas A&M University, College Station, Texas 77843, USA
  • 5Valparaiso University, Valparaiso, Indiana 46383, USA
  • 6University of Regina, Regina, Saskatchewan, S4S 0A2, Canada
  • 7Kurchatov Institute, Moscow, 123182, Russia

  • *alexg@triumf.ca
  • †Also at University of Victoria, Victoria, BC, Canada.
  • ‡Also at University of Calgary, Calgary, AB, Canada.
  • §Also at University of Saskatchewan, Saskatoon, SK, Canada.
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Phys. Rev. D 80, 052012 – Published 28 September, 2009

DOI: https://doi.org/10.1103/PhysRevD.80.052012

Abstract

We present the first measurement of the energy spectrum up to 70 MeV of electrons from the decay of negative muons after they become bound in Al27 atoms. The data were taken with the TWIST apparatus at TRIUMF. We find a muon lifetime of (864.6±1.2)  ns, in agreement with earlier measurements. The asymmetry of the decay spectrum is consistent with zero, indicating that the atomic capture has completely depolarized the muons. The measured momentum spectrum is in reasonable agreement with theoretical predictions at the higher energies, but differences around the peak of the spectrum indicate the need for O(α) radiative corrections to the calculations. The present measurement is the most precise measurement of the decay spectrum of muons bound to any nucleus.

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Phys. Rev. D 80, 052012– Published 28 September, 2009
  • Received 28 August 2009

© 2009 American Physical Society

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