Radiative muon capture on carbon, oxygen, and calcium

Journal Article · Fri Mar 01 04:00:00 EST 1991 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.43.1425· OSTI ID:6142432

Armstrong, D S; Ahmad, S; Burnham, R A; Gorringe, T P; Hasinoff, M D; Larabee, A J; Waltham, C E ^[1]; Azuelos, G; Macdonald, J A; Numao, T; Poutissou, J ^[2]; Blecher, M; Wright, D H ^[3]; Clifford, E T.H.; Summhammer, J ^[4]; Depommier, P; Poutissou, R ^[5]; Mes, H ^[6]; Robertson, B C ^[7]

---

1. University of British Columbia, Vancouver, British Columbia (Canada)
2. TRIUMF, Vancouver, British Columbia (Canada)
3. Virginia Polytechnic Institute and State University, Blacksburg, Virginia (USA)
4. TRIUMF, Vancouver, British Columbia (Canada) University of Victoria, Victoria, British Columbia (Canada)
5. Universite de Montreal, Montreal, Quebec (Canada)
6. National Research Council of Canada, Ottawa (Canada)
7. Queen's University, Kingston, Ontario (Canada)

The photon energy spectra from radiative muon capture on {sup 12}C, {sup 16}O, and {sup 40}Ca have been measured using a time projection chamber as a pair spectrometer. The branching ratio for radiative muon capture is sensitive to {ital g}{sub {ital p}}, the induced pseudoscalar coupling constant of the weak interaction. Expressed in terms of the axial-vector weak coupling constant {ital g}{sub {ital a}}, values of {ital g}{sub {ital p}}/{ital g}{sub {ital a}}=5.7{plus minus}0.8 and {ital g}{sub {ital p}}/{ital g}{sub {ital a}}=7.3{plus minus}0.9 are obtained for {sup 40}Ca and {sup 16}O, respectively, from comparison with phenomenological calculations of the nuclear response. From comparison with microscopic calculations, values of {ital g}{sub {ital p}}/{ital g}{sub {ital a}}=4.6{plus minus}1.8, 13.6{sub {minus}1.9}{sup +1.6}, and 16.2{sub {minus}0.7}{sup +1.3} for {sup 40}Ca, {sup 16}O, and {sup 12}C, respectively, are obtained. The microscopic results are suggestive of a renormalization of the nucleonic form factors within the nucleus.

• OSTI ID: 6142432
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 43:3; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651320* -- Nuclear Properties & Reactions
A=6-19
Experimental
651520 -- Nuclear Properties & Reactions
A=39-58
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BASIC INTERACTIONS
BRANCHING RATIO
CALCIUM 40 TARGET
CAPTURE
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
COUPLING CONSTANTS
DATA
EXPERIMENTAL DATA
INFORMATION
INTERACTIONS
LEPTON REACTIONS
MUON REACTIONS
NUCLEAR REACTIONS
NUMERICAL DATA
OXYGEN 16 TARGET
TARGETS
TIME PROJECTION CHAMBERS
WEAK INTERACTIONS