V. Perelygin

The tensor analyzing power ${T}_{20}$ for the reaction ${d}^{\ensuremath{\uparrow}}{+}^{12}\mathrm{C}\ensuremath{\rightarrow}p(0\ifmmode^\circ\else\textdegree\fi{})+X$ has been measured in the region of proton internal momenta $k$ in light-cone dynamics up to 1 GeV/ $c$. Measurements have been carried out at Dubna Synchrophasotron with polarized deuteron beam at deuteron momenta up to 9 GeV/ $c$. When $k$ increases the experimental values of ${T}_{20}$ have a tendency to approach the value ( $\ensuremath{-}$0.3) obtained by the calculation based on the reduced nuclear amplitude method in which the quark degrees of freedom are taken into account.

For prediction of earthquakes in the Caucasus, a network of measurement sites for radon and gamma-background is established. The sites are established in the galleries of Krasnodar and Stavropol regions. The setups of measuring gamma-background and Rn in the soil air were built in galleries near settlement Kholmsky. The detector of Rn in soil operates in the gallery near Pyatigorsk. Gamma-setup is being mounted. Moreover, solid state nuclear track detectors (SSNTD) are operating in several points, including a mud volcano. They are exchanged every month. The preliminary data show correspondences between background radiation levels, and seismic and atmospheric phenomena.

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.

We present new results of measurements of the isotopic cross sections of 12C fragmentation in the energy region of a few GeV/n. The experiment has been performed at the Dubna synchrophasotron using the magnetic spectrometer ANOMALON, equipped with Cherenkov counters. In this experiment 12C is the projectile and liquid hydrogen is a target. The isotopic cross sections obtained in the measurement are compared with the values predicted by the models: semi-empirical (Silberberg and Tsao) and parametric (Webber, Kish and Schrier). This work is a continuation of the previous one where similar results, but at 3.66 GeV/n, are presented.

An experiment with 12C beam fragmentation on a liquid hydrogen target has been performed using the magnetic spectrometer, Anomalon, equipped with a Cherenkov charge detector, and the Dubna synchrophasotron at a projectile energy of 3.66 GeV/nucleon. A charge resolution of 0.26e (except for the hydrogen nuclei) and a mass resolution of 0.11-0.18 amu have been achieved. Isotopic and elemental fragmentation cross sections have been obtained for fragments from Z = 1 to 6. Decayed cross sections have also been calculated. We compare the measured cross sections with the results of other experiments and with calculations based on semi-empirical and parametric approaches.

A movable polarized proton target is planned to be installed in polarized beams of the Synchrophasotron-Nuclotron complex in order to carry out a spin physics experimental program at Dubna. The project is described and the first proposed experiments are discussed.

The tensor analyzing power T20 for the reaction d↑ + 12C → 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 T20 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.

In the Compact Muon Solenoid (CMS) experiment, muon detection in the forward direction is accomplished by cathode strip chambers (CSC). These detectors identify muons, provide a fast muon trigger, and give a precise measurement of the muon trajectory. There are 468 six-plane CSCs in the system. The efficiency of finding muon trigger primitives (muon track segments) was studied using 36 CMS CSCs and cosmic ray muons during the Magnet Test and Cosmic Challenge (MTCC) exercise conducted by the CMS experiment in 2006. In contrast to earlier studies that used muon beams to illuminate a very small chamber area (<0.01m2), results presented in this paper were obtained by many installed CSCs operating in situ over an area of ≈23m2 as a part of the CMS experiment. The efficiency of finding two-dimensional trigger primitives within six-layer chambers was found to be 99.93±0.03%. These segments, found by the CSC electronics within 800 ns after the passing of a muon through the chambers, are the input information for the Level-1 muon trigger and, also, are a necessary condition for chambers to be read out by the Data Acquisition System.

The ME1/1 cathode strip chambers are the part of the CMS endcap muon system. They were designed and produced in Dubna. The chambers have been installed in the detector and commissioning has been completed. This paper describes chamber readout electronics and presents the results of the tests with cosmicray muons.

The production, installation, and testing of 468 cathode strip chambers for the endcap muon system of the CMS experiment played a critical role in the preparation of the endcap muon system for the final commissioning. Common testing procedures and sets of standard equipment were used at 5 international assembly centers. The chambers were then thoroughly retested after shipment to CERN. Final testing was performed after chamber installation on the steel disks in the CMS detector assembly building. The structure of the detector quality control procedure is presented along with the results of chamber performance validation tests.

The aim of this work is to estimate the shower leakage from the CMS Endcap Hadron calorimeter (HE) due to electromagnetic secondaries and punch-through in the region of the ME1/1 Forward Muon Station. Two configurations are considered: with and without the CMS Endcap Electromagnetic calorimeter (EE). The experimental data have been taken during the combined beam test of CMS subdetectors (HE, ME, RPC, DT) at the CERN H2 beam facility in 2004. Serial CSC chambers (ready for installation in CMS) fully equipped with readout electronics have been exposed. Simulation of a beam test setup has been performed using the GEANT4-based simulation software package OSCAR.

ME1/1 is a part of the endcap muon system of the CMS detector at the LHC (CERN). It plays the key role in the muon detection providing muon track matching with the CMS inner tracker. ME1/1 should provide high spatial and time resolution. The station is composed of 72 6-layer cathode strip chambers. The chambers were designed and produced at JINR (Dubna). ME1/1 is the innermost muon detector and operates in the strong axial magnetic field (B = 3 T) in the presence of high background of secondary particles. The paper presents the chamber design features and the ME1/1 station characteristics in the CMS runs with proton-proton collisions.