181 research outputs found
Bright vector solitons in cross-defocusing nonlinear media
We study two-dimensional soliton-soliton vector pairs in media with
self-focusing nonlinearities and defocing cross-interactions. The general
properties of the stationary states and their stability are investigated. The
different scenarios of instability are observed using numerical simulations.
The quasi-stable propagation regime of the high-power vector solitons is
revealed.Comment: 6 pages, 7 figure
New limit on the mass of 9.4-keV solar axions emitted in an M1 transition in Kr nuclei
A search for resonant absorption of the solar axion by nuclei
was performed using the proportional counter installed inside the
low-background setup at the Baksan Neutrino Observatory. The obtained model
independent upper limit on the combination of isoscalar and isovector
axion-nucleon couplings allowed us to set
the new upper limit on the hadronic axion mass of eV (95\%
C.L.) with the generally accepted values =0.5 and =0.56.Comment: 5 pages, 2 figures, Proceedings of the 10th Patras Workshop on
Axions, WIMPs and WISP 29 June - 4 July 2014, CERN, Geneva, Switzerlan
Spontaneous Magnetization and Electron Momentum Density in 3D Quantum Dots
We discuss an exactly solvable model Hamiltonian for describing the
interacting electron gas in a quantum dot. Results for a spherical square well
confining potential are presented. The ground state is found to exhibit
striking oscillations in spin polarization with dot radius at a fixed electron
density. These oscillations are shown to induce characteristic signatures in
the momentum density of the electron gas, providing a novel route for direct
experimental observation of the dot magnetization via spectroscopies sensitive
to the electron momentum density.Comment: 5 pages (Revtex4), 4 (eps) figure
Background radioactivity of construction materials, raw substance and ready-made CaMoO4 crystals
The results of measurements of natural radioactive isotopes content in
different source materials of natural and enriched composition used for CaMoO4
scintillation crystal growing are presented. The crystals are to be used in the
experiment to search for double neutrinoless betas-decay of Mo-100.Comment: Contribution to Proc. of Int. Workshop on Radiopure Scintillators
RPSCINT 2013, 17-20.09.2013, Kyiv, Ukraine; to be published in EPJ Web of
Conferences; 4 pages, 2 figure and 1 table
Hantaviruses in Insectivore Populations in Siberia
Objective of the study was investigation of hantaviruses in a new natural reservoir - insectivores, their diversity and geographic distribution in the Western and Eastern Siberia. Materials and methods. Sorex shrews (71 specimens) were captured in Altai Republic, Altai, and Krasnoyarsk Territories, and Omsk Region. All samples were analyzed for hantavirus RNA using reverse transcription polymerase chain reaction with subsequent sequencing. Results and conclusions. A total of 12 viral RNA isolates from two Sorex species (S. araneus and S. roboratus) were genetically typed. Sequence analysis of the partial L and S segments identified two distinct hantaviruses. Kenkeme (KKMV) virus was detected in a flat-skulled shrew (S. roboratus) in Altai Territory. This virus was previously found in geographically remote sites in the Sakha Republic and China. New foci of Seewis virus circulation among common shrews (S. araneus), were found in the Omsk Region, Altai and Krasnoyarsk Territories. Previously published and new findings suggest that hantaviruses among shrews are widely distributed over the Russian Federation territory. The widespread circulation of SWSV and KKMV throughout Siberia is an important argument for investigation of their role in human infections
- …