Photon asymmetry measurement in radiative muon capture on 40Ca

A. Pouladdej, T. P. Gorringe, M. D. Hasinoff, A. J. Larabee, A. J. Noble, C. J. Virtue, D. H. Wright, G. Azuelos, and B. C. Robertson
Phys. Rev. C 68, 034605 – Published 5 September 2003
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Abstract

A measurement of the photon asymmetry (αγ) in radiative muon capture RMC on 40Ca has been carried out at TRIUMF. Negative muons were stopped in a 40Ca target and the resulting RMC photons were then converted by a 5-cm thick NaI detector placed immediately in front of our main NaI detector, a cylindrical crystal of diameter 46 cm and depth 51 cm. The data sample consisted of 5200 high-energy (57MeV<Eγ<95MeV) RMC photon candidates. Our measured value for the energy-averaged photon asymmetry is αγ=1.00±0.23. The extracted values for the induced pseudoscalar coupling constant (gP) based on this photon asymmetry measurement are gP/gA<8.0, utilizing the impulse approximation IA model, and gP/gA<14.5 in terms of the modified impulse approximation (MIA) model. The two extracted values, although both consistent with the Goldberger-Treiman value of gP/gA7, are considerably different, indicating a significant theoretical model dependency.

  • Received 6 January 2003

DOI:https://doi.org/10.1103/PhysRevC.68.034605

©2003 American Physical Society

Authors & Affiliations

A. Pouladdej*, T. P. Gorringe, M. D. Hasinoff, A. J. Larabee, A. J. Noble§, C. J. Virtue, and D. H. Wright

  • University of British Columbia, Department of Physics and Astronomy, Vancouver, British Columbia, Canada V6T 1Z1

G. Azuelos**

  • TRIUMF, Vancouver, British Columbia, Canada V6T 2A3

B. C. Robertson

  • Queen’s University, Department of Physics and Astronomy, Kingston, Ontario, Canada K7L 3N6

  • *Present address: Nortel Networks, Advanced Technology Division, Ottawa, Ontario Canada K2H 8E9.
  • Present address: University of Kentucky, Department of Physics, Lexington, Kentucky 40506, USA.
  • Present address: Greenville College, Department of Physics, Greenville Illinois 62246, USA.
  • §Present address: Queen’s University, Department of Physics, Kingston, Ontario, Canada, K7L 3N6.
  • Present address: Laurentian University, Department of Physics and Astronomy, Sudbury, Ontario, Canada, P2E 2C6.
  • Present address: Stanford Linear Accelerator Center, Menlo Park, California 9405, USA.
  • **Also at Université de Montréal, Montréal, Quebec, Canada, H3C 3J7.

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Vol. 68, Iss. 3 — September 2003

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