Radiative muon capture on carbon, oxygen, and calcium

D. S. Armstrong, S. Ahmad, R. A. Burnham, T. P. Gorringe, M. D. Hasinoff, A. J. Larabee, C. E. Waltham, G. Azuelos, J. A. MacDonald, T. Numao, J. M. Poutissou, M. Blecher, D. H. Wright, E. T.H. Clifford, J. Summhammer, P. Depommier, R. Poutissou, H. Mes, B. C. Robertson

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


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.

Original languageEnglish
Pages (from-to)1425-1447
Number of pages23
JournalPhysical Review C - Nuclear Physics
Issue number3
StatePublished - 1991

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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