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Abstract
| The aim of this proposal is a measurement of the differential cross-section of the $\bar{p}$p $\rightarrow$ $\bar{n}$n charge-exchange reaction with a point-to-point precision of 1\% in the forward direction, and an absolute normalization error of 3\%. The high precision of the data should allow, inter alia, a determination of the $\pi$NN coupling constant to better than 2\%.
The measurement will be done using the existing neutron and antineutron detectors built for experiment PS199 and liquid hydrogen target. In one week of running time, with a $\bar{p}$ beam intensity of 3 $ 10 ^{5} $ $\bar{p}$/sec, the reaction will be measured at a few $\bar{p}$ momenta, in the range 500 to 900 MeV/c. |