The advent of the polarized proton beam at the Argonne zero-gradient synchrotron (ZGS) has permitted considerable improvement in technique for experiments which study spin dependence in inelastic strong interactions. Although these experiments are possible with a polarized proton target, the backgrounds due to carbon and oxygen in these targets make inclusive measurements difficult. In a recent experiment, we have used the polarized proton beam to measure left-right asymmetries for the reactions ppol + p→p, K±, π± + anything by placing a liquid hydrogen (LH2) target in the extracted polarized proton beam (ppol denotes polarized proton). The beam polarization is vertical and normal to the plane defined by the incident and scattered momenta. A portion of the experiment was run with a target fill of liquid deuterium, so that some information on the reaction ppol + n→p, K±, π± + anything was obtained. The data reported here are preliminary in nature and were accumulated at an incident proton momentum of 11.8 GeV/c.
KeywordsElastic Scattering Beam Polarization Neutron Target Target Fill Polarize Proton Target
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- 1.This convention yields a positive asymmetry for pp elastic scattering which is the same sign as results from the use of the Basel convention for polarized-target scattering. This consistency is the result of the properties of the identical particles in pp scattering. In general, to compare our results with p backward scattering from a polarized target, an additional minus sign must be introduced into the asymmetries.Google Scholar
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- 6.This correlation was first noticed by B. Wicklund.Google Scholar