ANNIHILATION OF 1.3 Bev ANTIPROTONS IN COMPLEX NUCLEI
An investigation of 537 interaction stars in nuclear emulsions, of which some 215 are caused by 2-Bev/c antiprotons and the rest to negative pions, is reported. The antiproton mean free path of annihilation is found to be 26 plus or minus 5 cm. Experimental results concerning antiproton stars are obtained from measurements on the sample of stars by subtracting the known pion contribution from the measured quantities. The average number of charged pions outside the nucleus for antiproton stars is 2.64 and the average total energy per pion 430 plus or minus 50 Mev. The mean number of emitted protons is 7.55 plus or minus 0.70 and the mean energy per star that these carry away is 415 plus or minus 50 Mev. The average pion multiplicity in the annihilation process is found to be 5.0. The calculation of this value requires a study of secondary interactions of primary pions in the nucleus where the annihilation occurs. It is found that 30 per cent of the primary pions leave the nucleus without interacting, 28 per cent are absorbed, 30 per cent leave the nucleus after one or more elastic and/or charge-exchange scatterings, and 12 per cent give rise to production of new pions through inelastic scattering. No antisigma hyperons are found. (auth)
- Research Organization:
- Univ. of Stockholm
- NSA Number:
- NSA-17-003971
- OSTI ID:
- 4773753
- Journal Information:
- Arkiv Fysik, Journal Name: Arkiv Fysik Vol. Vol: 22
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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