NEGATIVE-PION-PROTON ELASTIC SCATTERING AT 180 DEGREES FROM 1.6 TO 5.3 GEV/C.
MICHIGAN UNIV ANN ARBOR DEPT OF PHYSICS
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The differential cross section was measured for negative-pion-proton elastic scattering at 180 deg. in steps of 0.10 GeVc or less in the region from 1.6 to 5.3 GeVc. There is considerable structure in the cross section. This may be interpreted as an interference effect between the resonance amplitude and the nonresonant or background amplitude. There is a dramatic destructive interference at Po 2.15 GeVc which is quite interesting as the cross section drops almost two orders of magnitude in this region. Another interesting feature of the experiment is the large narrow peak in the cross section at Po 5.12 GeVc. We believe that this is firm evidence for the existence of a nucelon resonance with a mass of 3245 plus or minus 10 MeV. This N 3245 has a full width at half-maximum of less than 35 MeV. The width of the resonance is about 1 of its mass. Parities and the quantity XJ 12 are given for various N resonances where X is the elasticity and J is the spin of the resonance. Author
- Nuclear Physics and Elementary Particle Physics