$pi$$sup +$-p ELASTIC SCATTERING AT 310 Mev: PHASE-SHIFT ANALYSIS

Journal Article · Mon May 01 00:00:00 EDT 1961 · Physical Review (U.S.) Superseded in part by Phys.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.122.959· OSTI ID:4016176

Foote, J H; Chamberlain, O; Rogers, E H; Steiner, H M

A comprehensive phase-shift analysis of pi /sup +/-p elasticscattering data at 310-Mev incident-pion laboratory kinetic energy is performed. The experimental data utilized include measurements of the differential and total cross sections and of the recoil-proton polarization. The D-wave phase shifts were found to be definitely needed in order to attain an adequate fit to the data. A general search for phase-shift solutions was carried out, using S-, P-, and D- wave phase shifts. One solution- of the Fermi typewas found that fits the data significantly better than any of the other solutions obtained. The calculated errors in the phase shifts of this set vary from 0.4 to 0.6 deg. The effects of small nuclear F-wave phase shifts on the results of the analysis were investigated and were found to be large. The nuclear phase shifts in the original Fermi solution and their rms errors are (when F-wave phase shifts are allowed): S/sub 3/,/sub 1/ =-17.2 plus or minus 2.6 deg, P/sub 3/,/sub 1/ =-2.9 plus or minus 4.0 deg, P/sub 3/,/sub 3/ = 135.0 plus or minus 0.6 deg, D/sub 3/ ,/sub 3/ = 3.1 plus or minus 2.6 deg, D/sub 3/ i,/sub 5/ = -4.9 plus or minus 2.1deg, F/sub 3/,/sub 5/= 0.5 plus or minus 0.6deg, F/sub 3/,/sub 7/ =-0.6 plus or minus 1.4 de The values given here for the first five phase shifts approximate the corresponding values obtained when the F-wave phase shifts were assumed negligible. However, all except P/sub 3/,/sub 3/ fall outside the limits set by the small original errors. Inelastic-scattering processes were neglected during the phase-shift analysis. Extension of the phase-shift inquiries to include G waves was attempted, but it was observed that the available data and theory do not allow the G-wave interaction to be significantly incorporated into the analysis. (auth)

• Research Organization: Univ. of California, Berkeley
• NSA Number: NSA-15-017510
• OSTI ID: 4016176
• Report Number(s): UCRL-9481; 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• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 122; ISSN PHRVA
• Country of Publication: United States
• Language: English

Related Subjects

CROSS SECTIONS
D-WAVE
ENERGY RANGE
ERRORS
F-WAVE
MEASURED VALUES
MEV RANGE
P-WAVE
PHASE SHIFT
PHYSICS
PIONS
PIONS-PLUS
POLARIZATION
PROTONS
QUANTUM MECHANICS
RECOILS
S-WAVE
SCATTERING