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; B. C. Robertson

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, B. C. Robertson

Physics And Astronomy

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2 Scopus citations

Abstract

A measurement of the photon asymmetry (α_γ) 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 MeV<E _γ <95 MeV) RMC photon candidates. Our measured value for the energy-averaged photon asymmetry is α_γ = 1.00±0.23. The extracted values for the induced pseudoscalar coupling constant (g_P) based on this photon asymmetry measurement are g _P/g_A <8.0, utilizing the impulse approximation IA model, and g_P/g_A <14.5 in terms of the modified impulse approximation (MIA) model. The two extracted values, although both consistent with the Goldberger-Treiman value of g_P/g_A ≈ 7, are considerably different, indicating a significant theoretical model dependency.

Original language	English
Article number	034605
Pages (from-to)	346051-3460514
Number of pages	3114464
Journal	Physical Review C - Nuclear Physics
Volume	68
Issue number	3
State	Published - Sep 2003

ASJC Scopus subject areas

Nuclear and High Energy Physics

Cite this

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title = "Photon asymmetry measurement in radiative muon capture on 40Ca",

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 (57 MeV<E γ <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.",

author = "A. Pouladdej and Gorringe, {T. P.} and Hasinoff, {M. D.} and Larabee, {A. J.} and Noble, {A. J.} and Virtue, {C. J.} and Wright, {D. H.} and G. Azuelos and Robertson, {B. C.}",

year = "2003",

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language = "English",

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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.

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 MeV<E γ <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 MeV<E γ <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.

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VL - 68

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EP - 3460514

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M1 - 034605

ER -

Photon asymmetry measurement in radiative muon capture on ⁴⁰Ca

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ASJC Scopus subject areas

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