TY - JOUR
T1 - Photon asymmetry measurement in radiative muon capture on 40Ca
AU - Pouladdej, A.
AU - Gorringe, T. P.
AU - Hasinoff, M. D.
AU - Larabee, A. J.
AU - Noble, A. J.
AU - Virtue, C. J.
AU - Wright, D. H.
AU - Azuelos, G.
AU - Robertson, B. C.
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2003/9
Y1 - 2003/9
N2 - 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 (57 MeVγ <95 MeV) 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 g P/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/gA ≈ 7, are considerably different, indicating a significant theoretical model dependency.
AB - 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 (57 MeVγ <95 MeV) 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 g P/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/gA ≈ 7, are considerably different, indicating a significant theoretical model dependency.
UR - https://www.scopus.com/pages/publications/0345359336
UR - https://www.scopus.com/pages/publications/0345359336#tab=citedBy
U2 - 10.1103/PhysRevC.68.034605
DO - 10.1103/PhysRevC.68.034605
M3 - Article
AN - SCOPUS:0345359336
SN - 0556-2813
VL - 68
SP - 346051
EP - 3460514
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
IS - 3
M1 - 034605
ER -