Phys.Lett.B

The differential cross section of π − p scattering has been measured in the energy region 100–345 GeV and in the t -range 0.002<| t |< 0.04 (GeV/ c ) 2 . The real part of the π − p scattering amplitude has been extracted from the data. The results show that the real part continues to increase with energy. The energy dependence of the slope parameter has also been determined. The shrinkage found expressed in terms of the slope of the pomeron trajectory is2 α ′ p =0.23±0.04 (GeV/ c ) −2 . This agrees with the energy dependence found at larger| t |-values.

Phys. Lett. B

The differential cross section of pp scattering has been measured in the energy region 100–300 GeV and in the t -range 0.002 < | t | < 0.04 (GeV/| c ) 2 . The results on the real part of the scattering amplitude agrees with dispersion relation calculations. We also report on our determination of the slope parameter b together with an analysis of the world data of b for different hadrons and different t -values. It is shown that the data are consistent with the hypothesis of a universal shrinkage of the hadronic diffraction cone at high energies.

Sov.J.Nucl.Phys.

The results on measuring polarization in charge exchange reaction π−+p→π0+n at 40 GeV/c are presented for the 4-momentum transfer range from 0 up to 2 (GeV/c)2. At |t|≦0.4 (GeV/c)2 the polarization has a positive sign. In the “crossover” region of π± elastic scattering a possible minimum in the polarization behaviour has been seen for the first time. the polarization is zero within the statistical accuracy near this point. In the “deep” region of the charge-exchange differential cross-section the polarization has a negative sign. The presented data are not in agreement with the modern theoretical models.

Nucl.Phys.A

The process of slow π − absorption in 21 45 Sc, 27 59 Co, 39 89 Y, 55 133 Cs, 59 141 Pr and 79 197 Au atomic nuclei, followed by the emission of one proton, has been investigated. Upper limits for the probabilities of single-proton emission have been determined from the yields of the isotopes produced. The following values are obtained, per stopped pion: W ⩽ 6.1 × 10 −4 for the reaction 21 45 Sc(π − , p) 19 44 K, W ⩽ 0.87 × 10 −4 for 27 59 Co(π − , p) 25 58 Mn, W ⩽ 6.9 × 10 −4 for 39 89 Y(π − , p) 37 88 Rb, W ⩽ 1.3 × 10 −4 for 55 133 Cs(π − , p) 53 132 I, W ⩽ 3.0 × 10 −4 for 59 141 Pr(π − , p) 57 140 La, and W ⩽ 3.3 × 10 −5 for 79 197 Au(π − , p) 77 196m Ir.

Phys.Lett.B

The spin-spin correlation parameter C NN at 50° and 90° c.m. for elastic pp-scattering has been obtained in the energy range 0.69–0.95 GeV. It was found that the parameter C NN (90°) shows resonance-like structure at energies near 700 MeV. Its energy dependence does not agree with Hoshizaki's phase-shift analysis predictions. C NN (50°) agrees well with these predictions and does not show any structure within the accuracy of the measurements.

Usp.Fiz.Nauk

IEEE Trans.Nucl.Sci.

The analysis of particle motion from the injection region up to the final radius of the JINR high current phasotron is given. The purpose of the investigation was the appreciation of the beam quality and intensity. Synchrotron and betatron radial and vertical particle motion as well as space charge repulsion were included into the computer code for beam investigation. As a result, the beam intensity earlier appreciation of 40-45 ¿ A was confirmed, magnetic field tolerances in the first phase oscillation region were obtained and the required time dependences of acceleration voltage amplitude were refined.

J.Phys.G

Experimental data on large-angle p alpha elastic scattering at 200-450 MeV proton laboratory energies are compared with the theoretical predictions obtained using Feynman triangle diagrams with the virtual processes p+t( tau ) to alpha + pi and pN to pN.