From measurements of proton-proton elastic scattering at very small momentum transfers where the nuclear and Coulomb amplitudes interfere, we have deduced values of ρ, the ratio of the real to the imaginary forward nuclear amplitude, for energies from 50 to 400 GeV. We find that ρ increases from -0.157 ± 0.012 at 51.5 GeV to +0.039 ± 0.012 at 393 GeV, crossing zero at 280 ± 60 GeV.
No description provided.
Cross sections of 27 radionuclides formed by the interaction of 300-GeV protons with silver were determined on the assumption that the cross section of the reaction Al27(p, 3pn) remains the same as at 10-30 GeV. The results are compared with the corresponding values obtained at 11.5 GeV. The average value of the ratio σ300σ11.5 for all products ranging from Be7 to Ag106m is 0.91±0.07 and is independent of mass number.
No description provided.
SIG(C=11.5) means the cross section for 11.5 GeV Plab, obtained in previousexperiment.
We report our first measurements of the polarization in the elastic scattering of negative pions from polarized protons at an incident pion momentum of 40 GeV/ c . The momentum-transfer region covered was 0.08 < | t | < 1.3 (GeV/ c ) 2 . The angular distribution of the polarization exhibits a first minimum of ∼ − 5% and the well-known zero around t ≈ − 0.6 (GeV/ c ) 2 . The energy variation of the first minimum (at around t = − 0.2) may be expressed in a simple form, P avr = −(0.48±0.06) s −0.52±0.05 .
No description provided.
The differential cross sections of the elastic backward scattering reaction π − n→n π − has been measured at 23 and 40 GeV/ c in the u -interval −0.07 ⩽ u ⩽ 0.01 (GeV/ c ) 2 .
No description provided.
No description provided.
None
No description provided.
Forum