A. N. Livanov

ΔE-E detector for proton registration in nonmesonic deuteron breakup at the Nuclotron internal target

A design for a ΔE-E detector to investigate deuteron breakup in the Nuclotron-M internal target in a deuteron energy interval of 300–500 MeV is presented. The high-voltage power supply system of the PMT-63, which is based on the computer-controlled Wenzel Electronik module, is briefly described. A light-emitting diode (LED) monitoring system for the ΔE-E detector is considered. The results of testing the ΔE-E detector using cosmic muons and deuteron beams of the Nuclotron are presented.

Proposal on the measurements of d–p elastic scattering analyzing powers at 0.3–2.0 GeV at the Internal Target Station of the Nuclotron

A new high-energy beam polarimeter is proposed for Nuclotron, which uses the Internal Target Station (ITS). This polarimeter based on a measurement of asymmetry for the d–p elastic scattering will allow one to measure simultaneously both vector and tensor components of deuteron beam polarization. For this purpose an analyzing powers measurement for the d–p elastic scattering at energies T d = 0.88–2 GeV is proposed. The precise measurements of the deuteron analyzing powers over the energy range T d = 300–2000 MeV can give an irreplaceable clue to the study of the spin dependence of three nucleon forces.

Measurement of the vector and tensor analyzing powers for dp-elastic scattering at 880 MeV

The vectorAy and tensor analyzing powers Ayy andAxx for dpelastic scattering were measured at T lab d = 880 MeV over the c.m. angular range from 60 ◦ to 140 at the JINR Nuclotron. The data are compared with prediction s of different theoretical models based on the use of nucleon-nucleon forces only. The observed disc repancies of the measured analyzing powers from the calcula tions require the consideration of additional mechanisms. PACS: 24.70.+s, 25.10. +s, 21.45. +v

The 270 MeV deuteron beam polarimeter at the Nuclotron Internal Target Station

A deuteron beam polarimeter has been constructed at the Internal Target Station at the Nuclotron of JINR. The polarimeter is based on spin-asymmetry measurements in the d − p elastic scattering at large angles and the deuteron kinetic energy of 270 MeV. It allows to measure vector and tensor components of the deuteron beam polarization simultaneously.

Investigation of the angular dependence of the analyzing powers in the deuteron-proton elastic scattering at the nuclotron

New polarimeter based on the asymmetry measurement in dp-elastic scattering has been constructed at internal target at Nuclotron (JINR). The result on the deuteron analyzing powers Ay, Ayy and Axx in the deuteron-proton (dp) elastic scattering at the energies of 880 and 2000 MeV are presented. They are compared with different theoretical approaches.

Detection equipment for investigating dp elastic scattering at internal target of nuclotron in the framework of DSS project

A complex of detection equipment based on scintillation detectors for investigating dp elastic scattering at the internal target of the Nuclotron developed in the framework of the Deuteron Spin Structure (DSS) project is presented. The results of optimizing scintillation detectors and the results of test measurements of a deuteron beam of the Nuclotron are given.

The cross-section in dp -elastic scattering at the energies of 500, 700 and 880 MeV obtained at the internal target station of Nuclotron

The results on the cross-section of dp-elastic scattering reaction obtained at 500, 700 and 880 MeV at the internal target of Nuclotron are presented. The measurements have been performed using CH2 and C targets and kinematic coincidence of signals from scintillation counters. The cross-section data are compared with theoretical predictions and results of previous experiments.

Recent results with polarized deuterons and polarimetry at Nuclotron-NICA

Recent results on the deuteron analyzing powers obtained in collisions of polarized deuterons with protons and light nuclei at intermediate and high energies are reported. The obtained results are sensitive to the spin structure of the short range correlations. The prospects of the spin program for hadronic reactions at Nuclotron-NICA facility is discussed. The polarimetry developments are also presented.

Target position monitor for the internal target station at the Nuclotron

The principle of the internal target position monitor at the Nuclotron is described. It has been developed for the use in experiments with detection of particles in the forward direction. Therst results obtained using the target position monitor with polarized deuteron beam at the Nuclotron are presented. �¶¨¸ ´ ¶·¨´I¨¶ · iμEO ¤ EI¨± ¶μ²μ|¥´¨O ¢´E E·¥´´¥° ³¨I¥´¨ ´E±²μE·μ´ . EI¨± iO² · §- · iμE ´ ¤²O ¨¸¶μ²O§μ¢ ´¨O ¢ O±¸¶¥·¨³¥´E I ¸ ¤¥E¥±E¨·μ¢ ´¨¥³ I ¸E¨I ¶·¨ · ¸¸¥O´¨¨ ¢¶¥·¥¤. �·¥¤¸E ¢²¥´O ¶¥·¢O¥ ·¥§E²OE EO, ¶μ²EI¥´´O¥ ¸ ¨¸¶μ²O§μ¢ ´¨¥³ ¤ EI¨± ¶μ²μ|¥´¨O ³¨I¥´¨ ´ ¶EI±¥ ¶μ²O·¨§μ¢ ´´OI ¤¥°E·μ´μ¢ ´E±²μE·μ´ .

SEARCH FOR RESONANT STRUCTURE IN THE PION PRODUCTION REACTION ON THE NUCLOTRON INTERNAL BEAM

We have searched for an enhancement in the excitation function of the yield of pions in the pion production reaction by protons and deutrons at bombarding energies near 350 MeV/nucleon. The measurements was carried out on the JINR Nuclotron internal beam and target in March and June 2004 Nuclotron Runs for Ag, Cu, Al and C targets.