π±pElastic Scattering andπ+p→

Proposal to measure the differential cross sections for several $delta$$sup ++$ exchange reactions.

“…We see from the graphs that pions and kaons behave qualitatively alike and that 6m 3 has the range .015 to .08 (GeV 3 ) as u' rises from 0.1 (GeV/c) 2 to 1.0 (GeV/c) 2 . Hence, if we histogram all particles up to 1 GeV/c, the tails of the mass peaks would of course be dominated by the high momentum transfer events as expected.…”

“…We propose here to further study uchannel reactions in the incident momentum range from 3 to 6 GeV/c and for u values .1 < |uu | < (~ 1.0) (GeV/c) 2 , where u = u(l80 ). We will build a spectrometer utilizing spark chambers and counters to detect and momentum analyze the backward going meson.…”

“…The spectrometer is designed in such a way as to take advantage of kinematic focussing for two body and quasi-two body reactions by bending toward the beam direction. The design optimizes the acceptance for such reactions with emphasis on the u' range from ~ .1 (GeV/c) 2 to ~ 1 (GeV/c) 2 .…”

“…For the reaction K p » 27TT » in which we find particular interest, the acceptance ranges from ~ 0.1 (GeV/c) 2 to ~ 1.1 (GeV/c) 2 before it falls below the 25% x ^ point at 6 GeV/c. At 3.0 GeV/c the range is AT ~ 0.1 to .85 (GeV/c) 2 . It should be noted that the acceptance has a smooth shape so that the geometrical efficiency corrections will not introduce artificial structure in the cross sections.…”

“…Most two body u-channel cross sections for TT and K are expected to be comparable in magnitude. It is not unlikely that after a cut on missing mass, say MM < 2.0 GeV, that pions and kaons would have comparable abundances except for kaon decay.The number of decay lengths for kaons in the apparatus ranges from ~ 2 at u' ~ 0.1 to ^ 0.6 at u' ~ 1 (GeV/c)2 . The loss due to kaon decay therefore varies from ~ 857» to 457».Should the relative abundance be such that kaons are not obscured by the tail of the pion peak then we will have the TOF resolution to separate rr's and K's in the range of u" accepted by the system.…”