V. K. Bondarev

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 .

TARGET DEPENDENCE OF RELATIVISTIC DEUTERON FRAGMENTATION INTO CUMULATIVE PIONS

The power value of the A-dependence of the cross-section for 4.5 GeV/nucleon deuteron fragmentation into cumulative pions has been measured on carbon, aluminium, copper and lead nuclei for cumulative numbers within 0.8-1.2. The mean value is equal to 0.27 ± 0.09 in this interval. The target atomic weight dependence significantly differs from the volume type dependence on the atomic weight of fragmenting nucleus.

First results on the tensor analyzing power Ayy in deuteron inclusive breakup at large transverse momenta of protons

The tensor analyzing power A yy in inclusive breakup of 9 GeV/c deuterons on carbon has been measured at 85 mrad of the detected proton angle using polarized beam of the Synchrophasotron of the Laboratory for High Energies of JINR. The analyzing power A yy remains positive at the highest measured momentum of the proton in definite contradiction with the predictions based on the standard nucleon-nucleon potentials.

Measurement of the tensor analyzing power Ayy in the inelastic scattering of 4.5-GeV/c deuterons on beryllium at an angle of 80 mrad

The tensor analyzing power Ayy and the vector analyzing power Ay for the inelastic scattering of 4.5-GeV/c deuterons on beryllium nuclei at angle of about 80 mrad are measured in the vicinity of baryon-resonance excitation. These new data, presented as a function of t, comply well with the results of previous 4.5-, 5.5-, and 9-GeV/c measurements at zero angle in overlapping regions of t; all available data are described by a unified dependence on |t| upto about 0.9 (GeV/c)2. The experimental results are compared with the results of calculations performed within the multiple-scattering model and the model involving omega-meson exchange in the t channel.

New Data on Ayy in Deuteron Inclusive Breakup at Large Transverse Momenta and Relativistic Description of the Deuteron at Short Distances

Preliminary data on the tensor analyzing power A yy in breakup of 9 GeV/c deuterons on hydrogen and carbon nuclei at secondary proton transverse momenta up to ~ 900 MeV/c are presented. The results suggest that a deuteron structure function at short distances can depend on more than one independent variable unlike an ordinary wave function.

TENSOR ANALYZING POWER AYY IN DEUTERON INCLUSIVE BREAKUP AT LARGE PT AND SPIN STRUCTURE OF THE DEUTERON AT SHORT INTERNUCLEONIC DISTANCES

The Ayy data for deuteron inclusive breakup off hydrogen and carbon at a deuteron momentum of 9.0 GeV/c and large Pt of emitted protons are presented. The large values of Ayy independent of the target mass reflect the sensitivity of the data to the deuteron spin structure. The data obtained at fixed

Measurements of the Vector and Tensor Analyzing Powers of the Inelastic Scattering of Deuterons on Nuclei in the Vicinity of Baryonic Resonances Excitation

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Tensor analyzing power Ayy in deuteron breakup on hydrogen and nuclei at large transverse momenta of proton

and plotted versus Pt clearly demonstrate the dependence of the deuteron spin structure at short internucleonic distances on two variables. The data are compared with the calculations using Paris, CD-Bonn and Karmanovs deuteron wave functions.

Measurement of the tensor analyzing power Ayy in the inelastic scattering of deuterons in the vicinity of excitation of baryonic resonances

Vector Ay and tensor Ayy analyzing powers of the inelastic scattering of deuterons with the momenta of 4.5 GeV/c on 9Be and 9 GeV/c on 1H and 12C at an angle of ∼80 mr in the vicinity of the excitation of baryonic resonances with masses between 1200 and 2200 MeV/c2 have been measured. The values of parameter Ay suggest that the role of the spin‐dependent part of the NN → NN* elementary processes is significant. The new Ayy data are in good agreement with the previous data at 4.5, 5.5 and 9 GeV/c, obtained at a zero angle, in an overlapping region of t. The results of the experiments are compared with the calculations within the PWIA and ω‐meson exchange model. The data obtained show that polarization observables of (d,d′) reaction in the vicinity of the excitation of baryonic resonances may be used to study their properties.

Measurement of the Tensor-Analyzing Power A yy in Deuteron Breakup at 4.5 GeV/c and 80 mr

The data on the tensor analyzing power Ayy in the deuteron breakup reaction on hydrogen and nuclei (9Be and 12C) obtained at 9 and 4.5 GeV/c up to proton transverse momenta of ∼900 MeV/c are presented. The data demonstrate an approximate independence on the A-value of the target, as well as on the deuteron initial momentum, when they are plotted versus variables α and pT, that describe the internal motion of nucleons in the deuteron. The results suggest that a deuteron structure function at short distances may depend on more than one independent variable unlike an ordinary wave function.