L. Zolin

The slope parameter of the differential cross-section of elastic p-p scattering in energy range 12–70 GeV

Abstract The measurements of the differential cross section of elastic p-p scattering in relative units were performed in the energy range of 12–70 GeV. The values of the slope parameter were obtained from this data. It was shown that the slope parameter of the differential p-p scattering is monotonously increasing when the proton energy rises in the range 12–70 GeV. We have obtained the slope Pomeranchuks pole trajectory from this data: α′ p = 0.40 ± 0.09.

Small angle proton-proton elastic scattering from 9 to 70 GeV/c

Proton-proton elastic scattering has been measured over the four-momentum transfer squared 0.0007 ⩽ t ⩽ 0.02 GeV2/c2. A gas hydrogen jet has been used as an internal target of the accelerator. The results indicate that the ratio of the real to the imaginary part of the proton-proton forward scattering amplitude rises smoothly with increasing energy from α = −0.35 ± 0.05 at p = 9.39 GeV/c to α = −0.092 ± 0.011 at p = 69.8 GeV/c.

Total elastic p-p, p-d, p-n cross sections in the energy range of 1-70 GeV

Abstract The total elastic p-p, p-d and p-n cross sections measured at the Serpukhov accelerator and Dubna synchrophasotron are presented in this paper.

Measurement of the tensor analyzing power Ayy in inclusive breakup of 9 GeV/c deuterons on carbon at large transverse momenta of protons

Abstract The tensor analyzing power A yy in inclusive breakup of 9 GeV/c deuterons on carbon has been measured at the detected proton angle of 85 mr. The analyzing power remains positive at the highest measured momentum of the proton in definite contradiction with the predictions of the existing models. The vector analyzing power A y has been obtained simultaneously with A yy .

Measurement of polarization transfer and the tensor analyzing power in polarized deuteron break-up with deuteron momenta up to 9 GeV/c

New experimental results for polarization transfer, κ0 and the analyzing power, T20, in 12C(d, p)X at 0° are present. The measurements have been performed at the Dubna polarized deuteron facility. At high intrinsic momenta of the proton in the deuteron (k⩾300 MeV/c) the behaviour of these observables is in disagreement with the impulse approximation predictions based on realistic NN-potentials. The data are compared with calculations of some other models predicting the high k behaviour of κ0 and T20.

Differential cross sections of elastic pp scattering in the energy range 8–70 GeV

Abstract In this paper we present tables of absolute differential cross sections of elastic pp scattering together with the values of the slope parameter B and the real-part parameter α, where B= d d t In dσ d t α= Re A(0) Im A(0) and A (0) is the amplitude of elastic pp scattering at t = 0. The cross-section data have been obtained at the Serpukhov accelerator from 8 to 70 GeV in the | t |-range 0.0007 − 0.12 (GeV/ c ) 2 .

Charged pion backward production in 15–65 GeV proton-nucleus collisions

Abstract The differential cross sections of π − and π + meson production at a laboratory angle of 159° in collisions of 15–65 GeV protons with Be, C, Al, Ti, Mo and W targets are measured. The data are presented in the tables for Lorentz-invariant cross sections over the momentum range of pions from 0.25 to 0.95 GeV/ c . The slopes (“temperatures”) of a cumulative part of the pion spectra (the pion kinetic energy is >0.35 GeV) increase by 15–20% with changing A from 9 up to 184. Some discrepancy in the E -dependence of the temperature of the cumulative pion spectra is observed in the high-energy region studied, namely the temperature at 15–65 GeV, taking its slow rise over this range into account, contradicts that at 400 GeV.

Fragmentation of tensor polarized deuterons into cumulative pions

Abstract The tensor analyzing power T20 of the reaction d +A→π − (0°)+X has been measured in the fragmentation of 9 GeV tensor polarized deuterons into pions with momenta from 3.5 to 5.3 GeV/c on hydrogen, beryllium and carbon targets. This kinematic range corresponds to the region of cumulative hadron production with the cumulative variable xc from 1.08 to 1.76. The values of T20 have been found to be small and consistent with positive values. This contradicts the predictions based on a direct mechanism assuming NN collision between a high momentum nucleon in the deuteron and a target nucleon (NN→NNπ).

Tensor analyzing power T20 for cumulative pion production from deuterons in the GeV energy region

Abstract The tensor analyzing power T 20 for the reaction d ↑ + 12 C → π ± (0°) + X has been measured with a polarized deuteron beam from 6.2 to 9.0 GeV/ c at a pion momentum3.0 GeV/ c . This experiment is focused on “cumulatively produced pions”, which are produced beyond the kinematically allowed limit for free nucleon-nucleon collisions. The measured values of T 20 turn out to be close to zero. They are in disagreement with the results of our impulse approximation calculation which is based on a single NN → πNN interaction and takes into account the internal motion of nucleons in the deuteron. Possible explanations of the result are discussed.

Differential cross sections of elastic pd scattering in the energy range 10–70 GeV

We present tables of the absolute differential cross sections of elastic pd scattering. The cross-section data have been obtained at the Serpukhov accelerator from 10 to 70 GeV in the |t|-range 0.002–0.2 GeV2/c2. The elastic pd scattering amplitude was parametrised as A(+)=dσd+12opt(i+α)exp12(Bt+Ct 2) The values α=ReA(0)ImA(0),B and C are presented in these tables.