In this paper, we present the last results of the OLIMPIA experiment on the search for and study of traces of heavy and superheavy element nuclei of galactic cosmic rays in olivine crystals from ...meteorites. The charge spectrum of cosmic rays in the region of heavy nuclei is obtained, three superheavy nuclei of natural origin with charges in the range 105 <
Z
< 130 and lifetimes longer than 3000 years, being a part of the so-called “stability island”, are identified.
At the ion accelerator HELIS at the LPI, the neutron yield is investigated in DD reactions within a polycrystalline deuterium-saturated CVD diamond, during an irradiation of its surface by a ...deuterium ion beam with the energy less than 30 keV. The measurements of the neutron flux in the beam direction are performed in dependence on the target angle, \b{eta}, with respect to the beam axis. These measurements are performed using a multichannel detector based on He3 counters. A significant anisotropy in neutron yield is observed, it was higher by a factor of 3 at \b{eta}=0 compared to that at \b{eta} = +-45{\deg}. The possible reasons for the anisotropy, including ion channeling, are discussed.
The results of the measurements of the double-differential production cross-sections of pions,
d
2
σ
π
/
d
p
d
Ω
, in p–C and
π
±
–C interactions using the forward spectrometer of the HARP experiment ...are presented. The incident particles are 12
GeV/c protons and charged pions directed onto a carbon target with a thickness of 5% of a nuclear interaction length. For p–C interactions the analysis is performed using 100,035 reconstructed secondary tracks, while the corresponding numbers of tracks for
π
-
–C and
π
+
–C analyses are 106,534 and 10,122, respectively. Cross-section results are presented in the kinematic range
0.5
GeV
/
c
⩽
p
π
<
8
GeV
/
c
and
30
mrad
⩽
θ
π
<
240
mrad
in the laboratory frame. The measured cross-sections have a direct impact on the precise calculation of atmospheric neutrino fluxes and on the improved reliability of extensive air shower simulations by reducing the uncertainties of hadronic interaction models in the low energy range.
Lebedev Physical Institute (LPI RAS) and Skobeltsyn Institute of Nuclear Physics MSU (SINP MSU) have started the series of test muon radiography experiments in Russia. These experiments are aimed at ...determination of the optimal conditions of the setup, elaboration of algorithms for data processing and the study of the method peculiarities. The final goal of the method development is drafting of monitoring systems for natural and technological objects which condition may be a threat for the population, infrastructure or environment.
Nuclear emulsion with molybdenum filling for observation of bb decay Ashitkov, V D; Bagulya, A V; Barabash, A S ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
09/2010, Letnik:
621, Številka:
1-3
Journal Article
Recenzirano
The usage of nuclear emulsion with molybdenum powder filling (not, vert, similar5% by weight of dry emulsion) for observation of bb decay is shown to be possible. Estimates for 1 kg of super(100)Mo ...with zero background give the sensitivity for the 0nubb decay of super(100)Mo at the level of MathML equation for 1 yr of measurement. Promising elements for the double beta decay search, besides molybdenum ( super(100)Mo), are also super(82)Se, super(150)Nd, super(96)Zr, super(130)Te, super(116)Cd, and super(48)Ca.
Measurements of the double-differential π
±
production cross-section in the range of momentum 100 MeV/c≤p< 800 MeV/c and angle 0.35 rad ≤θ< 2.15 rad in proton–beryllium, proton–aluminium and ...proton–lead collisions are presented. The data were taken with the HARP detector in the T9 beam line of the CERN PS. The pions were produced by proton beams in a momentum range from 3 GeV/c to 12.9 GeV/c hitting a target with a thickness of 5% of a nuclear interaction length. The tracking and identification of the produced particles was performed using a small-radius cylindrical time projection chamber (TPC) placed inside a solenoidal magnet. Incident particles were identified by an elaborate system of beam detectors. Results are obtained for the double-differential cross-sections d
2
σ/dpdθ at six incident proton beam momenta (3 GeV/c, 5 GeV/c, 8 GeV/c, 8.9 GeV/c (Be only), 12 GeV/c and 12.9 GeV/c (Al only)) and compared to previously available data.
Data on the observation of neutron bursts in the process of high-voltage discharge in the air at an average electric field strength ~ 1 MV/m and discharge current ~ 10 kA are presented. Two ...independent methods (CR-39 track detectors and plastic scintillation detectors) registered neutrons within the range from thermal energies up to the energies above 10 MeV with the flux of >= 1E6 neutrons per shot into 4{\pi} solid angle.
The results are presented of model calculation of the interaction and yield of galactic-cosmic-ray superheavy-element nuclear fragmentation products from the 50 <
Z
< 92 range of their charges as ...they pass through a certain meteorite-pallasite substance thickness.
Currently, the Geant4 is a standard tool for simulating experiments in high-energy physics. In this paper, we describe an improvement of the ionization model for hadrons, ions, and classical magnetic ...monopole, implemented in Geant4. Simulation results are discussed; their accuracy is analyzed depending on chosen parameters, and compared with experimental data.
PDF
