Measurement of the average and longitudinal recoil polarizations in the reaction /sup 12/C(. mu. /sup -/,. nu. )/sup 12/B(g. s. ): Magnitude of the induced pseudoscalar coupling

Journal Article · Mon Jun 08 04:00:00 EDT 1981 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.46.1507· OSTI ID:6453072

Roesch, L P; Telegdi, V L; Truttmann, P; Zehnder, A; Grenacs, L; Palffy, L

The polarizations, P/sub av/equivalent/J and P/sub L/equivalent/J, of the /sup 12/B in the reaction /sup 12/C( ..mu../sup -/,..nu..)/sup 12/B(g.s.) have been measured simultaneously, using the method of selective recoil implantation. Their ratio R/sup prime/ is largely immune to the systematics that affect absolute measurements of P/sub av/ and P/sub L/, more dependent on the dynamics than either, and almost insensitive to corrections for captures to /sup 12/B( states. Our result (normalized to unit P/sub ..mu../), R(g.s.) = -0.506(41), yields g/sub P//g/sub A/ = 9.0(1.7) (impulse approximation) and F/sub P//F/sub A/(q/sup 2//sub m/) = -1.03(14) (elementary particle treatment), to be compared to partially conserved axial-vector current predictions of 7 and -0.99, respectively, which are thus quantitatively verified.

• Research Organization: Laboratory for Nuclear Physics, Swiss Federal Institute of Technology, CH-8093 Zurich, Switzerland
• OSTI ID: 6453072
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 46:23; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

651322* -- Nuclear Properties & Reactions
A=6-19
Experimental-- Radioactive Decay-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CAPTURE
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
ELEMENTARY PARTICLES
FERMIONS
LEPTON REACTIONS
LEPTONS
MASSLESS PARTICLES
MUON REACTIONS
NEUTRINOS
NUCLEAR REACTIONS
PCAC THEORY
POLARIZATION
RECOILS
TARGETS