Pepan Letters
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Preprints and Communications

Here you can find JINR preprints and communications in pdf format starting from 1999.
File size is given in bytes in round brackets.

Subject Categories for JINR Publications Archive (1999 - 2017)

E13-2018-22 (622.408)
Korepanova N. V. et al.
Neutron Noise Analysis Using the Basic Element Method

The full range of noise energy pulses reaches ±22% under normal conditions of operation of the IBR-2M reactor (JINR, Dubna). Therefore, slow changes in average power, caused, for example, by the movement of regulatory bodies, “drown” in the noises. But in a number of cases, it is these slow components of the pulse energy variation, the so-called basic signals (baseline), that are of fundamental importance for justifying the conditions for safe operation of the reactor. To determine the baseline in the noises of the IBR-2M the sixth order mean-square piecewise polynomial approximation (MSPPA-6) was used for the detection of the baseline in the noises of IBR-2M. The algorithm MSPPA-6 depends on control parameters α, β, M and K, the optimal values of which depend on the initial noise parameters. The algorithm was applied to both the static and the dynamic state of the reactor in the range of an average power of 30 kW 2 MW. The average processing time of one point on a PC x86_64 Processor Intel Core i5-4570 Sandy Bridge machine, 3.20 GHz, was 0.05 ms, which allows using the MSPPA-6 algorithm in real time.

E1-2018-11 (1.393.237)
Tokarev M. (on behalf of the STAR Collaboration)
Recent STAR Spin Results and Spin Measurements at RHIC

The STAR experiment provides measurements of single- and double-spin asymmetries in longitudinally and transversely polarized p+p collisions at √ s = 200 and 510 GeV to deepen our understanding of the proton spin structure and dynamics of parton interactions over a wide range of collision energy, momentum and rapidity of the various produced probes. Polarized processes with W± production allow us to study the spin-flavor structure of the proton. Recent results obtained by STAR on the double longitudinal asymmetry, ALL, of pion and jet production at √ s = 200 and 510 GeV, the single longitudinal, AL, and transverse, AN, asymmetry of W± production at √ s =510 GeV are overviewed. STAR results on azimuthal single transverse asymmetry of pion in p↑ + (p, Au)- and jet + π± p↑ + p collisions are discussed. The proposed Forward Calorimeter System (FCS) and Forward Tracking System (FTS) upgrades at STAR would significantly improve the capabilities of existing detectors for measurements of observables such as asymmetries of pion, jet, DrelYan pairs produced at forward rapidities.

E3-2018-7 (250.576)
Granja C. et al.
Two Methods of Determination of Parities of Low-Lying States in 159Gd from Analysis of γ-Ray Intensities from 158Gd(nres,γ)159Gd Reaction

Energy levels and transitions in 159Gd were studied by means of radiative capture of resonance neutrons in 12 isolated resonances of 158Gd. The time-of-flight technique was used on an enriched target at the IBR-30 reactor at JINR, Dubna. A total of 80 primary gamma transitions were recorded, and their absolute intensities were determined resulting in the observation of 1/2± and 3/2± levels up to 2.4 MeV. Parities of the found levels were recalculated using two methods: the first method consists in analyzing of intensities averaging in 12 resonances, and in the second method individual intensities are analyzed. The second method is described for the first time.

P11-2018-6 (746.926)
Akishin P. G., Sapozhnikov A. A.
The Integral Formulation of the Magnetostatic Problem for Magnetic System Modelling

We consider the application of the volume integral method to the magnetic system calculations. The major stages of modelling process are discussed: the discretization of initial equations, the description of the algorithm for dividing the area into elements, the calculation of matrix elements for discretization problem and the solution for the obtained system of non-linear equations. The results of modelling of magnetic systems using the discussed method are presented and compared with calculations performed by other programs.

P2-2018-4 (837.094)
Sinegovsky S. I., Sorokovikov M. N.
Prompt Atmospheric Neutrinos in the Quark-Gluon String Model

We calculate the prompt atmospheric neutrino flux in the energy range 1105 TeV arising from decays of the charmed particles. Cross sections of the D-mesons and Λc-baryons production in pA- and πA-collisions are calculated in the framework of the phenomenological quark-gluon string model, free parameters of which were improved using measurement data of the LHC experiments. Predicted prompt neutrino flux is compatible with the constraint obtained in IceCube experiment. Also we compare our calculation with other predictions obtained for different charm production models.

P15-2018-3 (4.377.077)
Didyk A. Yu. et al.
Synthesis of Solid-State Structures and Chemical Elements under Irradiation by Bremsstrahlung γ Rays with a Maximum Energy of 10 MeV in Condensed Deuterium at a Pressure of 2.2 kbar

A high-pressure chamber filled with deuterium (DHPC) under initial pressure 2.2 kbar was irradiated during 49 h by bremsstrahlung γ rays with a maximum energy of 10 MeV. After irradiation, several particles with dimensions up to 1 mm fell out of the DHPC. On the inner surfaces of the DHPC, newly formed solid micro-objects were found in the form of crystalline and amorphous microparticles, filaments, nodules and inclusions. Investigations of the elemental composition of the revealed structures, carried out with the help of X-ray microprobe analysis, showed the presence of chemical elements in them, which were absent in the reaction chamber prior to the onset of irradiation. The following chemical elements were registered: 6C, 7N, 8O, 11Na, 12Mg, 13Al, 14Si, 15P, 16S, 17Cl, 19K, 20, 21Sc, 22Ti, 24Cr, 25Mn, 26Fe, 28Ni, 30Zn, 33As, 50Sn 82Pb. The experiment on the synthesis of chemical elements in deuterium confirms the results of previous experiments performed with other gases: hydrogen, helium and xenon.

2018-1 (14.227.816)
Brief Review of Topmost Scientific Results Obtained in 2017 at the Joint Institute for Nuclear Research