Radiative muon capture on carbon, oxygen, and calcium

Academic Article


  • The photon energy spectra from radiative muon capture on C12, O16, and Ca40 have been measured using a time projection chamber as a pair spectrometer. The branching ratio for radiative muon capture is sensitive to gp, the induced pseudoscalar coupling constant of the weak interaction. Expressed in terms of the axial-vector weak coupling constant ga, values of gp/ga=5.7±0.8 and gp/ga=7.3±0.9 are obtained for Ca40 and O16, respectively, from comparison with phenomenological calculations of the nuclear response. From comparison with microscopic calculations, values of gp/ga=4.6±1.8, 13.6-1.9+1.6, and 16.2-0.7+1.3 for Ca40, O16, and C12, respectively, are obtained. The microscopic results are suggestive of a renormalization of the nucleonic form factors within the nucleus. © 1991 The American Physical Society.
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    Author List

  • Armstrong DS; Ahmad S; Burnham RA; Gorringe TP; Hasinoff MD; Larabee AJ; Waltham CE; Azuelos G; MacDonald JA; Numao T
  • Start Page

  • 1425
  • End Page

  • 1447
  • Volume

  • 43
  • Issue

  • 3