Interactions initiated by 3-Bev protons of the BrookhavenCosmotron were studied by photoemulsion technique. With appropriate criteria, 115 events are attributed to interactions of the incident beam protons with hydrogen nuclei (~55%) and with bound protons of other nuclei (^45%). A detailed analysis allowed the subdivision of the 115 events in categories, according to the number of TV mesons (N^-0) produced in the collision. The ratio of elastic scattering to the total number of events was estimated to be o-ei/o-totai=0.20_o.o7 +004 . The observed cross section for pure elastic scattering is oe i = 8.9±1.0 mb.The percentages of single, double, triple, and quadruple 7r-meson production are respectively: 34_ 2 o +22 ; 35.6_ 23 +20 ; 9.6_4 +6 ; ~1.0+ 3 -6 . Among the 20 most probable cases of single T-meson production-the estimated ratio of ir + to ir° is or 7r + /0v° = 5.3..-i.4~H ) -3 . The experimental results are not in agreement with the Fermi statistical-model theory (in particular the lower limit for the experimental ratio of triple to single production is given by '-'1/10 in contrast with the predicted ratio 0-3/0-1 = 1/67) but are not inconsistent with the Peaslee excited-state-model theory.
UCRL-9386The energy dependence of the K--nucleon total cross sections has been measured over the K-momentum range 0.9 8 to 3.9 8 Bev /c. K--n eros s sections were obtained by deuterium -hydrogen subtraction, with a correction for screening effects. There is evidence for structure in the T=O K--n1.1cleon state in the momentum range 0.9 8 to 2.0 Bev /c. This structure is absent in the T= 1 state.In addition, a measurement was made at 1.9 5 Bev /c of the angular distribution of the, K -p elastic scattering at small angles. The forwardscattering amplitude obtained from the data gives a ratio of real part to imaginary part 0.5±0.2 at 0°The corresponding ratio for ;r--mesons at this· momentum was found to be 0.4 + 0.2 -0.4.Measurements of the K--p "elastic" charge exchange gives a cross section which falls from about 10 mb at 1 Bev /c to at most a few m b at 4Bev/c. ·~·
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