Measurement of the average and longitudinal recoil polarizations in the reaction 12C(μ-,γ)12B(g.s.): pseudoscalar coupling and neutrino helicity
(1982) Helvetica Physica Acta — Vol. 55, n° 1, p. 74-99 (1982)
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- (en) The polarizations Psub(av) and Psub(L) of the 12B in the reaction 12C(μ-,γ)12B(g.s.) have been measured simultaneously, using the method of selective recoil implantation. Their ratio, R, is largely immune to the systematics that affect absolute measurements of Psub(av) and Psub(L), more dependent on the dynamics than either, and almost insensitive to corrections for capture to excited 12B states. The result, R(g.s.)=-0.512(41), yields gsub(P)/gsub(A)=9.0(1.7) (impulse approximation) and Fsub(P)/Fsub(A)(q2)=-1.01(14) (elementary particle treatment), to be compared to PCAC predictions of 7 and -0.99 respectively. Thus PCAC is quantitatively verified. The neutrino helicity is found to be hsub(γsub(μ))=-1.06(11). (Auth.)
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Roesch, L. P., Telegdi, V. L., Truttmann, P., Zehnder, A., Palffy, L., & Grenacs, L. (1982). Measurement of the average and longitudinal recoil polarizations in the reaction 12C(μ-,γ)12B(g.s.): pseudoscalar coupling and neutrino helicity. Helvetica Physica Acta, 55(1), 74-99. https://hdl.handle.net/2078.5/256930 (Original work published 1982)