S.B. Nurushev

pp-phase shifts at 660 MeV

The results of a phase shift analysis on p-p scattering are presented. The data used in the analysis are included as well as the phase shifts, mixing parameters, and absorption coefficients derived. The real parts of the phase shifts can be connected by smooth curves with the corresponding phase shifts that have been found at lower energies. (D.C.W.)

Small-angle elastic scattering of protons on carbon nuclei at 660 MeV

Abstract The differential cross sections for the elastic scattering of protons by carbon nuclei and the proton polarization in this process have been measured in the interval1.8° ≦ θ ≦ 9° at 660 MeV. Using a magnetic analysis, elastic proton scattering was separated from inelastic scattering. The best values of the real and imaginary parts of the spin-independent and spin-dependent forward scattering amplitudes have been found to be g NR (0) = −5.05±0.45 fm , g NI (0) = 15.26±0.45 fm h NR (0) = −10.4±13.3 fm , h NI (0) = 37.6±9.3 fm . The values of the integrated optical potentials have been given. The values of r.m.s. radii for the central and spin-orbit potentials have been deduced to be equal to 2.48±0.04 fm and 2.83±0.16 fm. The spin-orbit interaction at 660 MeV is found to be smaller than that at 310 MeV. Conclusions are drawn on the complex value of the spin-orbit potential of the nucleon-nucleus interaction at 660 MeV.

Longitudinally polarized proton beam in the six-meter synchrocyclotron

Quantitative investigation of the spin relationships of nuclear interactions at high energies requires the determination of the scattering of protons on protons and neutrons by accelerator studies; in such works in addition to nonpolarized and transversally polarized beams, the longitudinally polarized ones must also be taken into account. Such a program was carried out with the help of the 6-m synchrocyclotron of the Joint lnstitute for Nuclear lnvestigations at Dubna on the basis of a proposal of S. B. Nurushev et al. (JINI Preprint No. P-278, 1959). The polarization scattering work was carried out in the vertical plane above the synchrocyclotron chamber; a longitudinally polarized beam was obtained in the horizontal plane and the polarization vector was directed parallel or antiparallel to the proton pulse in the beam. The flux density was 2 x 10/sup 6/ protons/ cm/sup 2/ sec. Analysis of the secondary p + p scattering on a polyethylene scatterer type polarimeter indicated an absence of vertical and transversal polarization components. (TTT)