Pion-nucleon charge exchange scattering at energies near 10, 20, and 40 MEV
Redmon, James A. Jr.
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Differential cross sections for n-p ~ n°n at the world's lowest energies are to be presented. Measurement of differential cross sections near center-ofmass scattering angles of 0, 90, and 180 degrees are complete. The LAMPF n° Spectrometer was used to detect the gamma ray from the n° ~ 2y decay. This technique produced a very clean signal for this reaction, but required extensive modeling to obtain absolute determinations of the solid angle acceptance and total n° detection efficiency. Comparison between measured and calculated Monte-Carlo responses lead us to conclude that we understand the normalizations needed for absolute cross section to the 5°/o level. The essential role of the charge exchange reaction in understanding the strong, or nuclear force will also be discussed.