TY - JOUR

T1 - Radiative muon capture on O, Al, Si, Ti, Zr, and Ag

AU - Bergbusch, P. C.

AU - Armstrong, D. S.

AU - Blecher, M.

AU - Chen, C. Q.

AU - Doyle, B. C.

AU - Gorringe, T. P.

AU - Gumplinger, P.

AU - Hasinoff, M. D.

AU - Jonkmans, G.

AU - Macdonald, J. A.

AU - Poutissou, J. M.

AU - Poutissou, R.

AU - Sigler, C. N.

AU - Wright, D. H.

N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

PY - 1999

Y1 - 1999

N2 - The photon spectra from radiative muon capture (RMC) on O, Al, Si, Ti, Zr, and Ag have been measured for photon energies greater than 57 MeV using a cylindrical pair spectrometer at the TRIUMF cyclotron. Values of [Formula Presented] the ratio of the radiative rate for photon energies above 57 MeV, to the nonradiative rate, are [Formula Presented] [Formula Presented] [Formula Presented], and [Formula Presented], respectively, in units of [Formula Presented]. The Al/Si rate difference confirms an earlier result. The Ti/Ca rate difference and the rate suppression in Zr and Ag are new results which confirm that the RMC rate is a much smoother function of neutron excess than of atomic number. This suggests that Pauli blocking is relatively more important for radiative capture than for nonradiative capture. The value of the ratio of the induced weak pseudoscalar to axial coupling constants, [Formula Presented] for O was found to be [Formula Presented], or [Formula Presented], depending on the theory used to extract it. These values are in good or fair agreement with the partially conserved axial-vector current (PCAC) hypothesis. For the other nuclei studied, large model dependences or a lack of detailed RMC calculations made tests of the PCAC hypothesis difficult.

AB - The photon spectra from radiative muon capture (RMC) on O, Al, Si, Ti, Zr, and Ag have been measured for photon energies greater than 57 MeV using a cylindrical pair spectrometer at the TRIUMF cyclotron. Values of [Formula Presented] the ratio of the radiative rate for photon energies above 57 MeV, to the nonradiative rate, are [Formula Presented] [Formula Presented] [Formula Presented], and [Formula Presented], respectively, in units of [Formula Presented]. The Al/Si rate difference confirms an earlier result. The Ti/Ca rate difference and the rate suppression in Zr and Ag are new results which confirm that the RMC rate is a much smoother function of neutron excess than of atomic number. This suggests that Pauli blocking is relatively more important for radiative capture than for nonradiative capture. The value of the ratio of the induced weak pseudoscalar to axial coupling constants, [Formula Presented] for O was found to be [Formula Presented], or [Formula Presented], depending on the theory used to extract it. These values are in good or fair agreement with the partially conserved axial-vector current (PCAC) hypothesis. For the other nuclei studied, large model dependences or a lack of detailed RMC calculations made tests of the PCAC hypothesis difficult.

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U2 - 10.1103/PhysRevC.59.2853

DO - 10.1103/PhysRevC.59.2853

M3 - Article

AN - SCOPUS:0033131574

SN - 0556-2813

VL - 59

SP - 2853

EP - 2864

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 5

ER -