Antinucleon-Nucleon Interactions

Antiproton Interactions in Hydrogen and Carbon below 200 Mev

“…While annihilation in the Ball-Chew model is not strongly dependent on core size, it is dependent in a cruder model suggested by Koba and Takeda. 16 There annihilation occurs upon an incoming antiproton of wavelength σ ann = π (a + )…”

“…Such high multiplicities as are observed seem to require a volume-of-inter action parameter Ω about 10 times the value expected when the Compton wave length of the pion is used as a radius. A different approach by Koba and Takeda, 16 wherein the pion cloud and nucleon core are treated separately, is more successful in predicting the high multiplicity observed.…”

The Way We Were: Bubble Chamber Pictures, Pion-Nucleon Interactions and Polology

“…Still along these lines was the next step, concerning the question "how many pions of the cloud one should take into account". Phenomenological (in the style of Mesons, (21) ) and near-theoretical (in the style of Fields, (22,23) ) studies strongly suggested that this number should be close to one.…”

“…"I believe-he concluded-that in the future we should work entirely within the framework of the analytically continued S matrix". 21 …”

Antiproton-proton annihilation into four and five pions at 2.4 and 2.9 GeV/ c

“…Distributions of the production angles of charged pions in the center-of-mass system for events in the 5ît sample at 2.9 GeV/c Figure 31c. Distribution of the production angles of the neutral pions in the center-of-mass system for events in the sample'at 2.9 GeV/c [01200 g CL U. is the number with Icos 6^1 < 0.5.3« The F/B and P/E ratios for the various angular distributions are given in Table 15- The asymmetry observed in the angular distributions can be understood in terms of the Koba-Takeda model (25). In this model, the nucléon is comprised of a neutral core with an approximate radius of 2/3 I 2m^c…”