By Eric Gordon Wasserman
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Additional resources for Time reversal invariance in polarized neutron decay
High intensity beams (= 109 neutrons/cm2/s) must be used to achieve sufficient counting statistics required to make precision measurements of the angular correlations. The lower average velocity of cold neutron beams gives the neutrons more time to decay within the detector. While the overwhelming majority of the neutrons produce no signal, they can produce considerable backgrounds by (n,)9 capture reactions in or near the detector. Tx105m/s ) in vacuum. 26 Its. This delayed coincidence is used to discriminate against processes, like (n, _,) neutron capture, that produce a prompt coincidence background in the detectors.
3 Contributions to Dis JTW have computed the first order corrections to the angular correlations that arise from Coulomb final state interactions. This contribution to Dfs, given to first order in otZ/pe by [Jac57b] D fs, (l) Coulomb_ = +20LZme . _(CsCA* Pe + CvCT* +C'sC'A* + C'vC'T*), (2-22) vanishes in the absence of non-V,A couplings. This is advantageous because this final state contribution to the D coefficient does not violate time reversal invariance and thus would act as a background to a true T-violation signal.
7 Implications for Future Neutron Experiments Some conclusions can be drawn from the previous experiments regarding performing more sensitive measurements of D for the neutron. Measuring the D coefficient 38 entails counting electron-proton coincidences. Significant reductions in the statistical uncertainty require either (a) new facilities to produce increased polarized neutron densities or (b) detectors with a higher useful coincidence detection efficiency per decay. At present higher unpolarized flux densities are not available, however, since the last of these experiments was done, neutron polarization technology has improved to the point where near perfect polarization is achievable.