PION-NUCLEON ELASTIC SCATTERING AT 310 Mev: PHASE-SHIFT ANALYSIS

Journal Article · Fri Mar 01 04:00:00 EST 1963 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.129.2311· OSTI ID:4737517

Vik, O. T.; Rugge, H. R.

A phase-shift analysis of pi /sup +/-p and pi /sup -/-p elastic scattering at 310 Mev has been performed. The data include differential and total cross-section and recoil-proton polarization data for both pi /sup +/-p and pi /sup -/-p elastic scattering, as well as differential cross-section data for charge-exchange scattering. Inclusion of d waves was necessary to attain an adequate fit to the data; in the case of pi --p differential cross section, the best fit included f waves. A general phase-shift search using s, p, and d waves was carried out; a single solution was obtained that adequately fit all the available data. The most notable characteristics of this solution are isotopic- spin 3/2 phase shifts similar to those obtained in a previous analysis of the pi /sup +/ -p data and a relatively large D/sub 1,5/ phase shift equal to approximately 15 deg. Errors on the isotopic-spin 1/2 phase shifts of this solutiop range from 0.3 to 0.9 deg. The isotopic-spin 3/2 phase-shift errors are similar to those obtained previously. Because the pi --p differential cross section data indicated a possible need for f waves, and since the only satisfactory spd solution displayed a large d-wave phase shift in the isotopic- spin 1/2 state, the analysis was extended to include f waves. The result of allowing f waves was to increase the errors on each of the phase shifts (up to about 2 deg), and also to introduce two new solutions, neither of which can be ruled out stntistically. These new solutions are similar to the d-wave solution in the isotopic-spin 3/2 phase shifts, but vary rather widely in isotopic-spin 1/ 2 phase shifts. Inelastic scattering processes were neglected throughout most of the analysis; however, a study of their effects on the final solutions was made and these effects were seen to be unimportant. (auth)

• Research Organization: Univ. of California, Berkeley
• NSA Number: NSA-17-013437
• OSTI ID: 4737517
• Report Number(s): UCRL-10436; 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• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 129; ISSN PHRVA
• Country of Publication: United States
• Language: English

Related Subjects

CROSS SECTIONS
D-WAVE
ELECTRIC CHARGES
ENERGY LEVELS
F-WAVE
INTERACTIONS
ISOSPIN
MATHEMATICS
NUCLEAR MODELS
NUCLEONS
PARTICLE MODELS
PHYSICS
PIONS
POLARIZATION
PROTONS
QUANTUM MECHANICS
RECOILS
SCATTERING
SPIN
VARIATIONS