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Polarization of Positrons from N 13 : A Mixed Transition

Polarization of Positrons from N 13 : A Mixed Transition c-0.02 Cos e F .G 1. Ditibto insaeagebtenteiiildrcin W 80_ W 60 _ Z 40 _ 20 _ 01.0 .8 .6 .4 .2 0 -.2 -.4 -.6 -.8 - 1.0 Cos e FIG. 1. Distribution in space angle between the initial directions of muon and positron for events in which the positron stops in the bubble chamber. the statistical standard deviation. 1137 wr-,u-e events of all energies have also been measured. The M-e space- angle results shown in Fig. 2 yield aa,= -0.18±0.05, in good agreement with a similar measurement by Evans et al.1 (a,,= -0.16+0.04) and with the result of Swanson et al.6 (a -0.18±0.015) in liquid propane at about 60TC. We have examined the effect of possible sources of scanning bias on our low-energy result and we feel that these make no significant contribution to the experi- mental uncertainty. The Lee-Yang two-component theory predicts that aall -!B , where t is related to the coupling constants and B is the fractional polarization of the muons at de- cay. In propane at the temperature of bubble chamber operation (about +60'C), B-=3X (0.17±0.03) = 0.51 ±0.09. This determines the two-component theory prediction for alo. Using the uncorrected theory http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

Polarization of Positrons from N 13 : A Mixed Transition

Hanna, S. S; Preston, R. S
Physical Review , Volume 108 (1) – Oct 1, 1957
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Publisher
American Physical Society (APS)
Copyright
Copyright © 1957 The American Physical Society
ISSN
1536-6065
DOI
10.1103/PhysRev.108.160
Publisher site
See Article on Publisher Site

Abstract

c-0.02 Cos e F .G 1. Ditibto insaeagebtenteiiildrcin W 80_ W 60 _ Z 40 _ 20 _ 01.0 .8 .6 .4 .2 0 -.2 -.4 -.6 -.8 - 1.0 Cos e FIG. 1. Distribution in space angle between the initial directions of muon and positron for events in which the positron stops in the bubble chamber. the statistical standard deviation. 1137 wr-,u-e events of all energies have also been measured. The M-e space- angle results shown in Fig. 2 yield aa,= -0.18±0.05, in good agreement with a similar measurement by Evans et al.1 (a,,= -0.16+0.04) and with the result of Swanson et al.6 (a -0.18±0.015) in liquid propane at about 60TC. We have examined the effect of possible sources of scanning bias on our low-energy result and we feel that these make no significant contribution to the experi- mental uncertainty. The Lee-Yang two-component theory predicts that aall -!B , where t is related to the coupling constants and B is the fractional polarization of the muons at de- cay. In propane at the temperature of bubble chamber operation (about +60'C), B-=3X (0.17±0.03) = 0.51 ±0.09. This determines the two-component theory prediction for alo. Using the uncorrected theory

Journal

Physical Review – American Physical Society (APS)

Published: Oct 1, 1957

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