Deuteron induced reactions at intermediate energies are investigated at Internal Target Station (ITS) of Nuclotron. The dp elastic scattering data have been accumulated in the angular range (70° - 120°) in c.m from 0.3 to 2.0 GeV of deuteron energy. Part of the obtained results of differential cross sections and analyzing powers of dp elastic scattering are compared with theoretical predictions based on relativistic multi-scattering model. The dp breakup data are obtained with the detection of two outgoing protons at the angles of (19° - 54°) in laboratory frame at the deuteron energies from 0.3 to 0.5 GeV in various detector configurations. One of the tools to study spin structure of short range correlations is the measurements of the cross section, tensor analyzing power T20 and spin correlation parameter Cy,y in the d3He → p(0°)4He reaction at the energies between 1.0 and 1.75 GeV using polarized 3He target and extracted polarized deuteron beam from new polarized ion source at Nuclotron. For this purposes the feasibility study has been performed. Proposed experiments on extracted deuteron beam of Nuclotron is aimed to investigate: non-nucleonic degrees of freedom and baryonic resonances properties in the d(A,d(0°))X and d(A,π-(0°))X reactions at different energies, non-nucleonic degrees of freedom via the measurements of the tensor Ayy and vector Ay analyzing powers in d(A,π-)X reaction and polarization properties of the baryonic resonances in the d(A,d)X reaction and others. First measurement of vector and tensor polarization of new polarized ion source has been performed in June-July of 2016y.

Experimental results concerning the kaon yield in the reaction d + Be → K ±(0°) + X for values of the cumulative variable x c in the range between 0.88 and 1.37 are presented. Values in the region of x c ≥ 1 correspond to short nucleon-nucleon distances (deuteron-core region) at which nucleon wave functions begin overlapping each other, forming a cluster (flucton) where the hadron-matter density is higher than the average matter density in the nucleus. The behavior of the K +/K − yield ratio in this region may be interpreted within the hypothesis that the quark sea in nuclei becomes harder because of the presence of a flucton component in nuclear matter.

Experimental results on the vector (A y ) and tensor (A yy ) analyzing powers in the fragmentation of 5- and 9-GeV/c polarized deuterons to high-momentum pions in the kinematical region corresponding to pion production on a strongly correlated nucleon pair (cumulative meson production) are presented. The angular and momentum dependences of A yy are not described by calculations performed in the impulse approximation by using standard deuteron wave functions. An explanation for our data should be sought on the basis of models that treat the deuteron at short distances (deuteron-core region) as a multiquark state—for example, a 6q cluster, whose high orbital angular momentum (D wave) leads to the observed strong dependence of the reaction tensor analyzing power A(\(\vec d\), π)X on the pion transverse momentum.

The results of measurements and the handling procedure of data on the tensor polarization of the deuteron beam arising as the beam passes through matter obtained at the Nuclotron during the June 2008 run using an extracted unpolarized 5 GeV/c deuteron beam are described. The effect observed is compared with calculations made in the framework of the Glauber multiple-scattering theory.

The asymmetry parameter P was measured for the elastic pion-proton scattering in the very backward angular region of \( \theta_{{\rm CM}}^{}\) \( \approx\) 150 - 170° at several pion beam energies in the invariant-mass range containing most of the pion-proton resonances. The general goal of the experimental program was to provide new data for partial wave analyses in order to resolve their uncertainties in the baryon resonance region to allow the unambiguous baryon spectrum reconstructions. Until recently the parameter P was not measured in the examined domain that might be explained by the extremely low cross-section. At the same time the predictions of various partial wave analyses are far from agreement in some kinematic areas and specifically those areas were chosen for the measurements where the disagreement is most pronouncing. The experiment was performed at the ITEP U-10 proton synchrotron, Moscow, by the ITEP-PNPI Collaboration in the latest 5 years.

Data on the tensor and vector analyzing powers (A yy and A y , respectively) in the fragmentation of a 9-GeV/c deuteron on hydrogen and carbon nuclei at high proton transverse momenta are presented. These data are compared with the results of relevant calculations performed within light-front dynamics by using various deuteron wave functions. The best description of the data is attained with the relativistic deuteron wave function derived within field-theory light-front dynamics.

The tensor polarization of the deuteron beam arising as deuterons pass through a carbon target was measured. The experiment was performed with an extracted unpolarized 5-GeV/ c deuteron beam of the Nuclotron. The effect observed is compared with the calculations made using the Glauber multiple scattering theory.

The investigation of the spin structure of d, 3H, and 3He has been performed at the RIKEN acceleration research facility and VBLHE. Vector A y and tensor A yy , A xx , A xz analyzing powers for \(\vec d\) d → 3Hen and \(\vec d\) d → 3Hp are presented at 270 MeV. Themirror channels (3Hen and 3Hp) are comparedto each other in order to find possible manifestation of charge-symmetry breaking. The preliminary results on the polarization observables for \(\vec d\) d → 3Hp at 200MeV are also presented. The obtained data are compared with one-nucleon-exchange calculations.As a byproduct, \(\vec d\) d → pX and \(\vec d\) 12C → pX breakup reactions are investigated at 140, 200, and 270MeV. The experimental data on \(\vec d\) p elastic scattering were obtained at 270, 880, and 2000 MeV at the Nuclotron. The polarization of the deuteron beam was measured at 270 MeV at the internal target station. The preliminary data on the vector A y and tensor A yy , A xx analyzing powers for the \(\vec d\) p elastic scattering at 880 MeV are presented. The calculations on A y , A yy , and A xx analyzing powers for the \(\vec d\) p elastic scattering at 880 MeV were performed in the framework of the multiple-scattering model.

The experiments performed at tensor polarized deuteron beam with momentum up to 9 GeV/c revealed some strong spin effects in fragmentation of deuterons into high momentum pions. Tensor analyzing power Ayy in the reaction A(d,pi)X demonstrates a linear rise when pions are produced in the region of the invariant variable xc > 1 and the transverse momentum Pt exceeds 0.4 GeV/c. Under these conditions the deuteron core is probed at internucleonic distances up to 0.4 fm where nucleon wave functions overlap and NN-pair can be treated as 6q-configuration. A large contribution of D-wave (L=2) in deuteron core region means that the 6q-configuration carries an appropriate high angular momentum. One can assume that this striking Pt dependence of Ayy in d -> pi fragmentation can be interpreted within the framework of Sivers like mechanism applied to 6q-system in D-state.

Latest results by the ITEP‐PNPI collaboration on the asymmetry in the π+p elastic scattering are presented. The data were obtained for the first time in the region of backward angles with low cross section, where the predictions of the partial wave analyses are not reliable. The results at 1.94 GeV/c are in favor of the older KH80 analysis and show noticeable deviation from the latest FA06 solution by GWU group. At 2.07 GeV/c very low cross section did not allow to achieve good accuracy. Yet the data do not follow any of the PWA predictions and definitely disagree with SP06 analysis.

The experiment on the investigation of the A(d, p)X reaction at the extracted deuteron beam created at the Serpukhov U-70 accelerator is proposed. Precise measurements of the momentum spectra of protons emitted in the (d, p) reaction at an initial deuteron momenta of 20–40 GeV/c can give unique information on the deuteron short-range structure. A manifestation of contribution of nonnucleonic degrees of freedom in the deuteron is entirely possible over this energy range.

The angular dependence of the tensor A yy and vector A y analyzing powers in the inelastic scattering of deuterons with a momentum of 9.0 GeV/ c on hydrogen and carbon has been measured. The range of measurements corresponds to the baryonic resonance excitation with masses of ∼2.2–2.6 GeV/ c 2 . The A yy data, being in good agreement with the previous results, demonstrate an approximate t scaling up to −1.5 (GeV/ c ) 2 . The large values of A y show a significant role of the spin-dependent part of the elementary amplitude of the NN → NN * reaction. The results of the experiment are compared with model predictions of the plane-wave impulse approximation.

Recent results on the spin effects in few-nucleon systems obtained at Veksler and Baldin Laboratory of High Energies of JINR are reported. The experimental data have been obtained with the use of polarized deuteron beam at Synchrophasotron-Nuclotron Accelerator Complex and RIKEN Accelerator Research Facility. The data are sensitive to the short-range structure of light nuclei, where relativistic effects and non-nucleonic degrees of freedom can play a significant role.

The angular dependence of the tensor A(yy) and vector A(y) analyzing powers in the inelastic scattering of deuterons with a momentum of 9.0 GeV/c on hydrogen and carbon has been measured. The range of measurements corresponds to the baryonic resonance excitation with masses of similar to 2.2-2.6 GeV/c(2). The A(yy) data, being in good agreement with the previous results, demonstrate an approximate t scaling up to - 1.5 (GeV/c)(2). The large values of A(y) show a significant role of the spin-dependent part of the elementary amplitude of the NN --> NN* reaction. The results of the experiment are compared with model predictions of the plane-wave impulse approximation.

For the first time since the old Synchrophasotron machine was shut down, polarised deuterons have been accelerated at the new SC Nuclotron accelerator. The polarisation of the beam was measured by several polarimeters: after the 10 MeV linac, inside the accelerator ring, and after beam extraction. The high value of the vector polarisation Pz of the deuteron beam during acceleration was confirmed by all polarimeters to be + 0.62 and - 0.56. The intensity of the polarised deuteron beam in a short one-turn injection mode (8 mu s) was observed to be 1.3* 10(8) up arrow d/pulse. To increase the intensity of the accelerated polarised beam, multiturn charge exchange injection should be used. A polarised up arrow D- ion source is required. The existing up arrow D+ source POLARIS was rebuilt as a up arrow D- source. A new plasma up arrow D- charge exchange ionizer was developed and tested. First results of the beam polarisation measurements are presented.

The PHENIX experiment at RHIC has measured transverse energy and charged particle multiplicity at mid-rapidity in Au+Au collisions at sqrt(s_NN) = 19.6, 130 and 200 GeV as a function of centrality. The presented results are compared to measurements from other RHIC experiments, and experiments at lower energies. The sqrt(s_NN) dependence of dE_T/deta and dN_ch/deta per pair of participants is consistent with logarithmic scaling for the most central events. The centrality dependence of dE_T/deta and dN_ch/deta is similar at all measured incident energies. At RHIC energies the ratio of transverse energy per charged particle was found independent of centrality and growing slowly with sqrt(s_NN). A survey of comparisons between the data and available theoretical models is also presented.

Experimental investigation of quasi-elastic scattering of polarised protons on nuclei has been carried out at the JINR VB LHE Synchrophasotron (Dubna, Russia). The analyzing power of proton-nucleus scattering was measured using a beam of stripped polarised protons at 2.5, 3.0 and 3.6 GeV. The goal of the experiment was to test the effect of the analyzing power reduction on proton scattering on intranuclear protons and neutrons, in comparison with scattering on free nucleons.

The tensor analyzing power Ayy in inclusive breakup of 9.0 GeV/c deuterons on hydrogen and carbon has been measured at different emission angles of protons. The data are compared to calculations within the framework of light-front dynamics by using different deuteron wave functions. The results suggest that the relativistic deuteron structure may depend on more than one independent variable.