Elsevier

Physics Letters B

Volume 148, Issues 4–5, 29 November 1984, Pages 270-274
Physics Letters B

New pulsed-beam measurement of the average polarization of 12B (ground state) produced in the polarized-muon capture reaction 12C(μ−,vμ)12B

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Abstract

The average polarization Pav of the recoil nucleus 12B (bound states) produced in the polarized-muon capture reaction was measured by the muon spin resonance method in a pulsed beam at the BOOM muon facility. The polarization of 12B was maintained completely under a longitudinal magnetic field of 3kG in a Grafoil target. After correcting the observed result for excited-state contributions of 12B, Pav(ground state) was deduced to be 0.462 ± 0.053. It yields gP/gA = 10.1 −2.6 +2.4, which is almost consistent with the prediction of the PCAC hypothesis of about 7.

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