[en] The experimental data on π^-C-interactions at P_π-=40 GeV/c, also pC, dC, ⁴HeC and ¹²CC-interactions at a momentum of 4.2 A GeV/c are used in this paper. The statistical material was separated into the following groups with the number of protons Q:Q≥1;2;3;...Q;.... The invariant inclusive spectra of π^--mesons and protons f=(E/σ) d³σ/dp³ versus their kinetic energy T in the laboratory system of coordinates were obtained for each group of events. These spectra are of the exponential form, and they were approximated by the expressions consisting of one exponent, the sum of two exponents and the sum of three exponents. The best approximations were selected, and the behaviours of the parameters from these approximations were studied depending on Q. As a result, the boundary values of Q^*, under the excess of which qualitative changes in the properties of the considered interactions take place, are verified. It is shown that the events with Q≥Q^* correspond to the events with the total disintegration of the nuclear target. In this region a sharp increase of the kinetic energy of π^--mesons and a sharp decrease of the kinetic energy of protons are observed for nucleus-nucleus interactions with increasing Q. The suppression of the 'leading' effect is observed in the events with Q≥Q^* We have discovered a connection between the number of collisions and the number of protons, i.e. increasing the number of protons at a constant number of protons at a constant number of collisions. This contradiction is explained by that there is fast widening of some metastable state, the extreme state of nuclear matter, in the region Q≥Q^*

[en] The 4π-fragment-spectrometer FOBOS developed for heavy ion research at beam energies of 10-100AMeV has been commissioned for physical experiments at the FLNR of the Joint Institute for Nuclear Research. Based on the logarithmic detector principle, it is able to register charged fragments from protons up to heavy residual nuclei in a large dynamic range. Position sensitive avalanche counters, axial ionization chambers and CsI(Tl) scintillation detectors are arranged in three concentric detector shells. An array of phoswich detectors is used as a more granular forward detector at narrow polar angles. The modular concept of FOBOS allows for different experimental application in the field of exclusive fragment spectroscopy at medium multiplicities

[en] We present our preliminary results of the investigation of the modification of the structure of the CoFe₂O₄ colloids due to the variation of the temperature by means of small angle neutron scattering. The modification of the radius of gyration of the system obtained in the Guinier's approximation, consequently of the hydrodynamic radius, with the variation of the temperature is explained by two phenomena: the Van der Waals attraction between the long tails of the oleic acid molecules adsorbed at the surface of the same particle, determining the surfactant layer to become thinner, and the interpretation of the surfactant shells due to the increasing of the dipole-dipole interaction between the particles with the lowering of the temperature

[en] The tensor analyzing power T₂0 for the p (d,p) d and p (d,p) pn reactions at 0 deg (θ_cm^p = 180 deg) have been measured at incident momenta from 3.5 to 6.5 GeV/c. For both reactions T₂0 remains negative up to 6.5 GeV/c (that corresponds to the internal momentum k≅0.85 GeV/c, defined in the light front system). This situation completely contradicts the standard one nucleon exchange model prediction. A new structure in the dependence of T₂0 on k≅0.65 GeV/c is observed .The first measured values of T₂0 for deuteron breakup without pion production differ at the same k both from data on T₂0 for the backward elastic scattering and from data on T₂0 for deuteron breakup in the region where pion production is allowed. An evidence has been obtained on a 'quasiresonance' enhancement of differential cross section close to the kinematical limit of the p(d,p)pn reaction. New data on T₂0 for the p(d,d') X reaction in the region of M_X from 1.46 to 1.62 GeV/c² have been obtained simultaneously. (author)

[en] A four-dimensional triple coincidence scintillation time spectrometer with two detectors was developed for the search of isomeric states and γ-rays coincided with them in nano- and microsecond region in short-lived nuclei. Computer-aided recording of four-dimensional coincidences E1-E2-E3-T was provided. Isomeric states were identified in nuclei belonging to the long radioactive chains starting from ²²⁵Ac and ²³²Th and also at decay of ¹⁶⁹Yb. (author)

[en] Structural changes in ammonium halides ND₄Br and ND₄Cl at pressures up to 45 kbar and up to 35 kbar, respectively, have been studied with the DN-12 diffractometer at the IBR-2 pulsed reactor. For both systems, the equation of state and the position parameter of deuterium atoms as functions of pressure were obtained. The obtained equations of state are nearly the same as the ones for the nondeuterated systems NH₄Br and NH₄Cl obtained by the piston displacement technique. It was found that the order - disorder phase transition from the phase in which the ammonium tetrahedra are randomly oriented (CsCl-type cubic structure, space group Pm3m) into the phase in which the ammonium tetrahedra are oriented in parallel (CsCl-type cubic structure, space group P4 bar 3m), occurs at equal critical value of the position parameter u=0.153 ± 0.002 in both systems. It appears to be valid for all of the ammonium halides, and, possibly, for other similar compounds. (author)

[en] The S-matrix in the static limit of a dispersion relation has a finite order N and is a matrix of meromorphic functions of energy ω in the plane with cuts (-∞, -1], [+1, +∞). In the elastic case it reduces to N functions S_i(ω) from the physical sheet to unphysical ones can be treated as a nonlinear system of difference equations. It is shown that a global analysis of this system can be carried out effectively in projective spaces P_N and P_N+1. The connection between spaces P_N and P_N+1 is discussed

[en] The measurement of half-life of the ground state ²¹³Po was performed by the three dimensional single crystal scintillation time spectrometer. A more precise value of this nuclear constant - T₁/2=3.70(3) μm has been received. (author)

[en] The mean characteristics of particles in the events with total disintegration of the carbon nuclear target in collisions with π^--mesons (with a momentum of 4.2 A GeV/c) are obtained. The peculiarities of the behaviour of these characteristics depending on the type of event are revealed, and the selection criterion of reactions with the total disintegration of the nuclear target is specified. An indication of the existence of boundary values of the sum charge of detected particles (Q^*) is obtained, after which the regime of the behaviour of the mean characteristics of secondary particles changes depending on Q. It is found that in the events with the total disintegration of the nuclear target, there take place the energy dissipation and the increase of the mean values of the cumulativity orders of secondary particles independent of the mass of the nuclear shell

[en] The present collection of rapid communications from JINR, Dubna, contains seven separate reports on observation of transversal handedness in the diffractive production of pion triples, a possible experiment on the research of dibaryon states, Cherenkov beam counter system of the CERES/NA45 spectrometer for investigation with 160 GeV/n. lead ions, a profile-based gaseous detector with capacitive pad readout as the prototype of the shower maximum detector for the end-cap electromagnetic calorimeter for the STAR experiment, what DELPHI can get with an upgraded position for the very small angle tagger, estimation of the radiation environment and the shielding aspect for the point 2 area of the LHC and the orthopositronium decay puzzle