Measurements of asymmetries of pion single charge exchange on polarized 3He at 200 MeV

Physics – Nuclear Physics

Scientific paper

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Polarization Phenomena In Reactions, Pion Charge-Exchange Reactions, Nuclear Reactions Involving Few-Nucleon Systems

Scientific paper

Asymmetries for the (π-,π0) reaction on polarized 3He were measured using a 200-MeV pion beam at LAMPF. The π0's were detected with the neutral meson spectrometer in coincidence with the recoiling tritons. A recoil triton detector, consisting of scintillation-counter telescopes and a wire chamber, was used to measure the time-of-flight, energy loss, and direction of the tritons. The polarized gaseous 3He target, developed at TRIUMF, was modified to run with two diode lasers; the polarization reached 65%. The asymmetries between θlab=60° and 105° were found to be strongly angle dependent. The results are compared with theoretical calculations.

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