3,982 research outputs found
CALCULATION OF NEUTRON-CAPTURE REACTIONS CONTRIBUTION TO ENERGY RELEASE IN VVER-1000 USING SERPENT CODE
Calculating the energy release in fuel elements is an important aspect of the modeling and design of nuclear reactors. Most of the energy is produced by fission, but a non-negligible percentage is coming from neutron capture reactions, such as (n, Ξ³) or (n, Ξ±). We implement a previously developed method for the calculation of effective energy release using Serpent Monte Carlo code. We investigate the percentage of capture component in effective energy release for various models of VVER-1000 fuel: firstly, an equivalent cell, then fresh fuel assemblies of different compositions, differing in fuel enrichment and the presence of burnable absorbers. The results are compared to similar calculations previously done in MCNP 4 and MCU 5
Software Development for Description of Patterns in Two-Dimensional Space in Autoit by the Method of Coordinates on the Plane
In this work, we developed a program that describes patterns in two-dimensional space in the AutoIt language. Using the method of coordinates on a plane, the program code demon-strates the interdependence between the polar coordinate system and the Cartesian one
Optimization of the self-sufficient thorium fuel cycle for CANDU power reactors
The results of optimization calculations for CANDU reactors operating in the thorium cycle are presented in this paper. Calculations were performed to validate the feasibility of operating a heavy-water thermal neutron power reactor in a self-sufficient thorium cycle. Two modes of operation were considered in the paper: the mode of preliminary accumulation of 233U in the reactor itself and the mode of operation in a self-sufficient cycle. For the mode of accumulation of 233U, it was assumed that enriched uranium or plutonium was used as additional fissile material to provide neutrons for 233U production. In the self-sufficient mode of operation, the mass and isotopic composition of heavy nuclei unloaded from the reactor should provide (after the removal of fission products) the value of the multiplication factor of the cell in the following cycle K>1. Additionally, the task was to determine the geometry and composition of the cell for an acceptable burn up of 233U. The results obtained demonstrate that the realization of a self-sufficient thorium mode for a CANDU reactor is possible without using new technologies. The main features of the reactor ensuring a self-sufficient mode of operation are a good neutron balance and moving of fuel through the active core
Experimental evidence of planar channeling in a periodically bent crystal
The usage of a Crystalline Undulator (CU) has been identified as a promising
solution for generating powerful and monochromatic -rays. A CU was
fabricated at SSL through the grooving method, i.e., by the manufacturing of a
series of periodical grooves on the major surfaces of a crystal. The CU was
extensively characterized both morphologically via optical interferometry at
SSL and structurally via X-ray diffraction at ESRF. Then, it was finally tested
for channeling with a 400 GeV/c proton beam at CERN. The experimental results
were compared to Monte Carlo simulations. Evidence of planar channeling in the
CU was firmly observed. Finally, the emission spectrum of the positron beam
interacting with the CU was simulated for possible usage in currently existing
facilities
Lipschitz shadowing implies structural stability
We show that the Lipschitz shadowing property of a diffeomorphism is
equivalent to structural stability. As a corollary, we show that an expansive
diffeomorphism having the Lipschitz shadowing property is Anosov.Comment: 11 page
Study of Scintillator Strip with Wavelength Shifting Fiber and Silicon Photomultiplier
The performance of the cm plastic scintillator
strip with wavelength shifting fiber read-out by two novel photodetectors
called Silicon PhotoMultipliers (SiPMs) is discussed. The advantages of SiPM
relative to the traditional multichannel photomultiplier are shown. Light yield
and light attenuation measurements are presented. This technique can be used in
muon or calorimeter systems.Comment: 9 pages, 5 figure
Meson vacuum phenomenology in a three-flavor linear sigma model with (axial-)vector mesons
We study scalar, pseudoscalar, vector, and axial-vector mesons with
non-strange and strange quantum numbers in the framework of a linear sigma
model with global chiral symmetry. We perform a
global fit of meson masses, decay widths, as well as decay amplitudes. The
quality of the fit is, for a hadronic model that does not consider
isospin-breaking effects, surprisingly good. We also investigate the question
whether the scalar states lie below or above 1 GeV and find the
scalar states above 1 GeV to be preferred as states. Additionally,
we also describe the axial-vector resonances as states.Comment: 29 pages, 4 figures, 3 tables. v2 is the updated version after
referee remarks (dilaton field discussed, a new figure added
ΠΠΎΠ΄Ρ ΠΎΠ΄Ρ ΠΊ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΡΡΠ°Π²ΠΊΠΈ Π΄ΠΈΡΠΊΠΎΠ½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π² ΠΏΡΠΎΠ΅ΠΊΡΠ½ΠΎΠΌ ΡΠΈΠ½Π°Π½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΠΈ: ΠΎΡΠ΅ΡΠ΅ΡΡΠ²Π΅Π½Π½ΡΠΉ ΠΈ ΠΌΠ΅ΠΆΠ΄ΡΠ½Π°ΡΠΎΠ΄Π½ΡΠΉ ΠΎΠΏΡΡ
ΠΠΈΡΠΊΠΎΠ½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ Π΄Π΅Π½Π΅ΠΆΠ½ΡΡ
ΠΏΠΎΡΠΎΠΊΠΎΠ² ΡΠ΅Π³ΠΎΠ΄Π½Ρ ΡΠΈΡΠΎΠΊΠΎ ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΠ΅ΡΡΡ Π² ΠΏΡΠ°ΠΊΡΠΈΠΊΠ΅ ΠΎΡΠ΅Π½ΠΊΠΈ ΡΡΠΎΠΈΠΌΠΎΡΡΠΈ Π±ΠΈΠ·Π½Π΅ΡΠ°, ΠΏΡΠΎΠ΅ΠΊΡΠ½ΠΎΠΌ ΡΠΈΠ½Π°Π½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΠΈ, ΠΏΡΠΈ ΡΠΎΡΡΠ°Π²Π»Π΅Π½ΠΈΠΈ ΡΠΈΠ½Π°Π½ΡΠΎΠ²ΠΎΠΉ ΠΎΡΡΠ΅ΡΠ½ΠΎΡΡΠΈ. ΠΡΠΈ ΡΡΠΎΠΌ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄Ρ ΠΊ ΡΠ°ΡΡΠ΅ΡΡ ΡΡΠ°Π²ΠΊΠΈ Π΄ΠΈΡΠΊΠΎΠ½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΌΠΎΠ³ΡΡ ΡΠ°Π·Π»ΠΈΡΠ°ΡΡΡΡ Π² Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΠΎΡ ΠΎΠ±ΡΠ΅ΠΊΡΠ° ΠΈ ΡΠ΅Π»ΠΈ Π°Π½Π°Π»ΠΈΠ·Π°, Π²ΠΈΠ΄Π° Π΄Π΅Π½Π΅ΠΆΠ½ΠΎΠ³ΠΎ ΠΏΠΎΡΠΎΠΊΠ°, ΠΈΠΌΠ΅ΡΡΠΈΡ
ΡΡ ΠΈΡΡΠΎΡΠ½ΠΈΠΊΠΎΠ² ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ ΠΈ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄ΠΎΠ² ΠΊΠΎΠ½ΠΊΡΠ΅ΡΠ½ΡΡ
ΡΡΠ°Π½Π΄Π°ΡΡΠΎΠ² ΠΎΡΠ΅Π½ΠΊΠΈ ΠΈΠ»ΠΈ ΡΠΈΠ½Π°Π½ΡΠΎΠ²ΠΎΠΉ ΠΎΡΡΠ΅ΡΠ½ΠΎΡΡΠΈ, Π°Π½Π°Π»ΠΈΡΠΈΠΊΠΎΠ², Π±Π°Π½ΠΊΠΎΠ², ΠΏΡΠΎΡΠ΅ΡΡΠΈΠΎΠ½Π°Π»ΡΠ½ΡΡ
ΡΠΎΠΎΠ±ΡΠ΅ΡΡΠ².Π ΡΡΠ°ΡΡΠ΅ ΡΠ°ΡΡΠΌΠΎΡΡΠ΅Π½Ρ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄Ρ ΠΊ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΠΎΡΠ½ΠΎΠ²Π½ΡΡ
ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½ΡΠΎΠ² Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ ΡΠ°ΡΡΠΎ ΠΏΡΠΈΠΌΠ΅Π½ΡΠ΅ΠΌΠΎΠΉ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ»ΠΎΠ³ΠΈΠΈ ΡΠ°ΡΡΠ΅ΡΠ° ΡΡΠ°Π²ΠΊΠΈ β ΡΡΠ΅Π΄Π½Π΅Π²Π·Π²Π΅ΡΠ΅Π½Π½ΠΎΠΉ ΡΡΠΎΠΈΠΌΠΎΡΡΠΈ ΠΊΠ°ΠΏΠΈΡΠ°Π»Π° ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΠΈ. ΠΠΊΡΠ΅Π½Ρ ΡΠ΄Π΅Π»Π°Π½ Π½Π° Π²ΡΠ±ΠΎΡ ΠΌΠ΅ΠΆΠ΄Ρ ΠΏΠ»Π°Π²Π°ΡΡΠ΅ΠΉ ΠΈ ΡΠΈΠΊΡΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΡΠ°Π²ΠΊΠ°ΠΌΠΈ, ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ ΡΡΠΎΠΈΠΌΠΎΡΡΠΈ Π·Π°Π΅ΠΌΠ½ΠΎΠ³ΠΎ ΡΠΈΠ½Π°Π½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ, ΠΏΡΠ΅ΠΌΠΈΠΈ Π·Π° Π°ΠΊΡΠΈΠΎΠ½Π΅ΡΠ½ΡΠΉ ΡΠΈΡΠΊ, Π° ΡΠ°ΠΊΠΆΠ΅ Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ ΡΡΠ±ΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½ΡΠ° β ΠΏΡΠ΅ΠΌΠΈΠΈ Π·Π° ΡΠΏΠ΅ΡΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΡΠΈΡΠΊ ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΠΈ ΠΈΠ»ΠΈ ΠΏΡΠΎΠ΅ΠΊΡΠ°.ΠΠΎΠΏΠΎΠ»Π½ΠΈΡΠ΅Π»ΡΠ½ΠΎ Π² ΡΡΠ°ΡΡΠ΅ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΡΠΌΠΏΠΈΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ β ΠΎΠ±Π·ΠΎΡΠ° ΡΡΠ°Π²ΠΎΠΊ ΠΊΡΡΠΏΠ½Π΅ΠΉΡΠΈΡ
ΠΎΡΠ΅ΡΠ΅ΡΡΠ²Π΅Π½Π½ΡΡ
ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΠΉ, ΡΠ°ΡΠΊΡΡΡΡΡ
Π² ΠΈΡ
ΡΠΈΠ½Π°Π½ΡΠΎΠ²ΠΎΠΉ ΠΎΡΡΠ΅ΡΠ½ΠΎΡΡΠΈ
DANSSino: a pilot version of the DANSS neutrino detector
DANSSino is a reduced pilot version of a solid-state detector of reactor
antineutrinos (to be created within the DANSS project and installed under the
industrial 3 GW(th) reactor of the Kalinin Nuclear Power Plant -- KNPP).
Numerous tests performed at a distance of 11 m from the reactor core
demonstrate operability of the chosen design and reveal the main sources of the
background. In spite of its small size (20x20x100 ccm), the pilot detector
turned out to be quite sensitive to reactor antineutrinos, detecting about 70
IBD events per day with the signal-to-background ratio about unity.Comment: 16 pages, 11 figures, 3 tables. arXiv admin note: substantial text
overlap with arXiv:1304.369
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