ANTIPROTON INTERACTION CROSS SECTIONS
A study was made of 371 antiproton tracks in nuclear emulsions in the energy region 250 to 0 Mev. A path length of 36.5 meters was followed. Ten elastic p-p scattering events together with eleven events published earlier yielded an elastic scattering cross section of 77 plus or minus 17 mb. The total and the differential elastic cross sections were consistent with the theory by Chew and Ball. The mean free path for annihilation in the energy region 35 to 250 Mev was 19.4 plus or minus 1.5 cm, and the inter-action mean free path was 17.4 plus or minus l.2 cm. An effective antiproton-nucleon cross section of 170, +30-25 mb was deduced from an optical model calculation. Six inelastic scatterings are reported. Together with the 8 or 9 events published by Goldhaber et al., an inelastic scattering cross section of 43 plus or minus 11 mb per emulsion nucleus (hydrogen excluded) was obtained. The low value of the cross section is discussed in the light of the optical model. The elastic scattering on complex nuclei seems to agree with a completely absorbing nucleus. (auth)
- Research Organization:
- Uppsala Univ. Inst. of Physics
- NSA Number:
- NSA-16-016922
- OSTI ID:
- 4786786
- Report Number(s):
- AD-261903
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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