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SPATIAL DISTRIBUTION OF NATURAL U FISSION RATE IN QUINTA SUBCRITICAL ASSEMBLY IRRADIATED BY 1, 4, 6 AND 8 GEV DEUTERON’S BEAMS K.Husak 1 , M.Artushenko 2 , I.Zhuk 1 , V.Voronko 2 , M.Kadykov 3 , A.Patapenka 1 , A.Safronava 1 , V.Sotnikov 2 , S. Tyutyunnikov 3 , V.Chilap 4 , A.Chinenov 4 1 Joint Institute of Power and Nuclear Research-Sosny Minsk, Republic of Belarus 2 National Scientific Center Kharkov Institute of Physics and Technology Kharkov Republic of Ukraine 3 Joint Institute for Nuclear Research, Dubna, Russian Federation 4 CPTP “Atomenergomash”, Moscow, Russian Federation The experiments described in the paper were done within the framework of the research program “Investigations of physical aspect of electronuclear energy generation and atomic reactors radioactive waste transmutation using high energy beams of synchrophasotron/nuclotron JINR” in Laboratory of High Energy Physics (JINR, Dubna, Russian Federation). The experimental subcritical setup “QUINTA” contains five sections. Each section is composed of uranium rods arranged in the form of hexagonal (triangular) lattice with pitch size of 3.6 cm. Whole setup contains total of 512.56 kg of natural uranium. The experimental setup were irradiated by deuteron beams of energies 1, 4, 6 and 8 GeV. The beams were produced by superconducting, strong focusing synchrotron named Nuclotron (Laboratory of High Energy Physics). The axis of the setup was aligned with beam axis with the help of the adjustable stand under the whole setup. The alignment of the beam center with the center of the setup was achieved by examining Polaroid films placed in front of the target and exposed to a couple deuteron pulses prior to the installation of the sample plates and the start of the main irradiation. Deuteron's beams shape and position on the target were obtained from track density distribution on the irradiated track detectors. Information on the spatial distribution of fission reaction rate in the volume of the setup was obtained with sets of track detectors (SSNTD) coupled with nat U foils. Activation method was used to obtain the spatial distribution of 238 U(n,f) reaction. Sensors were placed on sample plates at different radial distances. 30 samples were used in each experiment. The results obtaining during the experiments were used to calculate neutron-physical characteristic of the subcritical assembly i.e. the total number of fission, spectral indexes and neutron spectra of the setup during irradiation. The simulations of the experiment were done with a FLUKA2011 Monte-Carlo code. Comparison experimental results and simulation is also presented. 136
RESULTS OF HBT MEASUREMENTS IN 12 C+ 12 C COLLISIONS AT MOMENTUM 4.2 A GeV/c E.I. Shahaliev 1,2,3† and A.V. Rauf 3 (1) Laboratory of High Energy Physics, JINR, 141980, Dubna, Russia (2) Institute of Radiation Problems, 370143, Baku, Azerbaijan (3) COMSATS Institute of Information Technology, Chak Shahzad, Islamabad, Pakistan † E-mail: ehtiram.shahaliyev@comsats.edu.pk Using the approach suggested by Hanbury-Brown and Twiss (HBT), we have studied the experimental data from 12 C+ 12 C collisions at 4.2A GeV/c. These data are obtained with the 2-m propane bubble chamber of LHE, JINR. The high accuracy of the data provides a reliable basis for the analysis of the momentum distribution of the secondary particles produced in this reaction. The HBT analysis indicates on the presence of quantum correlations for the secondary particles at low relative momenta ∼ 200MeV/c. In contrast, the two-particle momentum correlation functions obtained with the same data do not manifest any correlations in this region. The obtained results are compared with the predictions of the Ultrarelativistic Quantum Molecular Dynamics model (UrQMD). It appears that the UrQMD predictions disagree with the results of the HBT analysis which may indicate on the limitation of the UrQMD at this region. 137
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Joint Institute for Nuclear Researc
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Organized by Joint Institute for Nu
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ON THE CONTINUUM LIMIT OF LANDAU GA
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WITTEN PARAMETER IN THE SU (2)-GLUE
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NEW DATA ON THE DIFFERENTIAL CROSS
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RELATIVISTIC CORRECTION TO THE FIRS
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NEUTRON GENERATION BY RELATIVISTIC
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COMPARISON OF THE TRIGGERS OF THE A
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NUCLEAR TRANSPARENCY EFFECT IN PROT
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Only with the value L σ = 12 of σ
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SELF-SIMILARITY OF HIGH-P T HADRON
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Λ and Σ + (1385) HYPERONS RECONST
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ON RESULTS OF Y-89 IRRADIATION WITH
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TIMELIKE STRUCTURE FUNCTIONS AND HA
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MATHEMATIAL MODEL OF DNA LESIONS O.
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ADIABATIC CHEMICAL FREEZE-OUT AND W
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which, according to the finite widt
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STATUS AND RECENT RESULTS OF THE AT
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experimental errors of about 15 % f
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MEASURING THE PHASE BETWEEN STRONG
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ANALYSIS OF DIFFERENCES ON PSEUDORA
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THE SIGNALS OF PARTIAL RESTORATION
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RECENT HEAVY ION RESULTS FROM STAR
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SPECTROSCOPY AND REGGE TRAJECTORIES
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FORWARD-BACKWARD MULTIPLICITY CORRE
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INFRARED CONFINEMENT AND MESON SPEC
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WITTEN PARAMETER IN THE SU (2)-GLUE
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where A is surface coefficient, B i
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MICROSCOPIC PION-NUCLEON AND NUCLEU
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DEUTERONS BEAM PARAMETERS MEASUREME
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PERTURBATIVE STABILITY OF THE QCD P
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OBSERVATION OF LIGHT NUCLEI FORMATI
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RESONANCE RESULTS WITH THE ALICE EX
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NEUTRAL PION FLUCTUATION STUDIES AT
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DMITRIJ IVANENKO - EMINENT SCIENTIS
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ON THE POSSIBILITY OF MASSLESS NEUT
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SMALL x BEHAVIOR OF PARTON DENSITIE
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MODEL OF PP AND AA COLLISIONS FOR T
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”NON-ROSENBLUTH” BEHAVIOR OF TH
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DOUBLE PION PRODUCTION IN THE NP AN
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DIFFERENTIAL CROSS SECTIONS AND ANA
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OVERVIEW OF RECENT CMS RESULTS AT
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