15 research outputs found
Comments on multiple scattering of high-energy muons in thick layers
We describe two independent methods to calculate the angular distribution of
muons after traversing a thick scatterer due to multiple Coulomb scattering.
Both methods take into account the nuclear size effect. We demonstrate a
necessity to account for the nucleus extension as well as incoherent scattering
on atomic electrons to describe the muon scattering at large angles in thick
matter layers. The results of the two methods of calculations are in good
agreement.Comment: 22 pages, 5 figures, submitted to Nucl. Instrum. and Met
Transverse Enhancement Model and MiniBooNE Charge Current Quasi-Elastic Neutrino Scattering Data
Recently proposed Transverse Enhancement Model of nuclear effects in Charge
Current Quasi-Elastic neutrino scattering [A. Bodek, H. S. Budd, and M. E.
Christy, Eur. Phys. J. C{\bf 71} (2011) 1726] is confronted with the MiniBooNE
high statistics experimental data. It is shown that the {\it effective} large
axial mass model leads to better agreement with the data.Comment: 4 pages, 6 figure
Neutrino Quasielastic Scattering on Nuclear Targets: Parametrizing Transverse Enhancement (Meson Exchange Currents)
We present a parametrization of the observed enhancement in the transverse
electron quasielastic (QE) response function for nucleons bound in carbon as a
function of the square of the four momentum transfer () in terms of a
correction to the magnetic form factors of bound nucleons. The parametrization
should also be applicable to the transverse cross section in neutrino
scattering. If the transverse enhancement originates from meson exchange
currents (MEC), then it is theoretically expected that any enhancement in the
longitudinal or axial contributions is small. We present the predictions of the
"Transverse Enhancement" model (which is based on electron scattering data
only) for the differential and total QE cross sections
for nucleons bound in carbon. The dependence of the transverse
enhancement is observed to resolve much of the long standing discrepancy in the
QE total cross sections and differential distributions between low energy and
high energy neutrino experiments on nuclear targets.Comment: Revised Version- July 21, 2011: 17 pages, 20 Figures. To be published
in Eur. Phys. J.
Quasielastic axial-vector mass from experiments on neutrino-nucleus scattering
We analyze available experimental data on the total and differential
charged-current cross sections for quasielastic neutrino and antineutrino
scattering off nucleons, measured with a variety of nuclear targets in the
accelerator experiments at ANL, BNL, FNAL, CERN, and IHEP, dating from the end
of sixties to the present day. The data are used to adjust the poorly known
value of the axial-vector mass of the nucleon.Comment: 27 pages, 19 figures. Typos corrected; tables, figures and references
added, discussion extended; matches published versio
Calculation of the Flux of Atmospheric Neutrinos
Atmospheric neutrino-fluxes are calculated over the wide energy range from 30
MeV to 3,000 GeV for the study of neutrino-physics using the data from
underground neutrino-detectors. The atmospheric muon-flux at high altitude and
at sea level is studied to calibrate the neutrino-fluxes at low energies and
high energies respectively. The agreement of our calculation with observations
is satisfactory. The uncertainty of atmospheric neutrino-fluxes is also
studied.Comment: 51 page
Project Struve
We present the current status of the space astrometry and photometry project STRUVE which is being designed at the Pulkovo Observatory (Russia) in cooperation with other Russian space institutes in order to extend the Hipparcos reference system. This project will include about 20 million stars down to V = 19:5 mag. The proper motions of the Hipparcos stars are to be determined with the mean accuracy of about 0.1 mas/yr. The mean accuracy of star positions in the output catalogue is expected to be better than 0.6 mas. A properly designed micrometer will give the possibility of observing all objects on the sky down to V = 14 mag. Key words: space astrometry; future projects. 1. INTRODUCTION The space astrometry and photometry project Struve (Yershov et al. 1995) is being designed at the Pulkovo Observatory in cooperation with other Russian space institutes. It is expected that launch will be before 2010 and a mission duration of at least 36 months is planned. The main objective is to ex..