EXTENSION OF THE ISOBARIC NUCLEON MODEL FOR PION PRODUCTION IN PION- NUCLEON, NUCLOON-NUCLEON, AND ANTINUCLEON-NUCLEON INTERACTIONS
The isobaric nucleon model of pion production in nucleonnucleon and pion- nucleon collisions is extended to include the effect of the higher resonances in the isotopic spin T = 1/2 state of the pion-nucleon system, in addition to the effect of the low-energy T = 3/2 resonance. The higher T = 1/2 resonances are centered at incident pion energies of 600 and 880 Mev, and thus correspond to isobar masses m = 1.51 and 1.68 Bev, respectively, as compared to m/sub I/ = 1.23 Bev for the T = 3/2 resonance. For the inelastic pion-nucleon interactions, calculations of the various pion and recoil nucleon energy spectra are carried out for incident pion energies T pi = by the incident pion are considered, corresponding tc two tions for the center-of-mass energy spectra of the finalstate pions and nucleons are obtained for all single and double pion production reactions from both pi /sup -/ -p and pi /sup +/-p collisions. The results of the extended isobar model at T pi = 1.0 Bev are in reasonable agreement with data on pi /sup -/-p interactions in the region of 1.0 Bev incident energy. The Q value distributions for pion-nucleon and pion-pion pairs are calculated for single pion production at T pi = 1.0 Bev. The model can also be used to treat up to four-pion final states in pi /sup -/-N interactions, and up to eight-pion final states in NN interactions. For pion production in nucleon- nucleon collisions, the branching ratios are obtained for all pion production reactions that involve isobaric states corresponding to the T = 3/2 and T = 1/2 resonances. General equations for the energy spectra of the final-state pions and nucleons are derived for all single- and double-pion production reactions from both p/sup -/-p and n/sup -/-p collisions. Calculations of the various pion and nucleon energy spectra have been carried out for incident nucleon energies of 2.3 and 3.0 Bev. For the processes of pion production in antinucleon-nucleon interactions which do not result in anninilation, it has been assumed that an anti-isobar N alpha * can be produced, which is the antiparticle of the isobar N alpha *. Specific results are obtained for both single and double pion production in p/sup -/-p, p/sup -/-n, and n/sup -/-p collisions. (auth)
- Research Organization:
- Brookhaven National Lab., Upton, N.Y.
- NSA Number:
- NSA-15-024243
- OSTI ID:
- 4030567
- Report Number(s):
- BNL-5380; 0031-899X
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 123; ISSN PHRVA
- Country of Publication:
- United States
- Language:
- English
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