50 research outputs found
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
Magnetic, electronic, and transport properties of the high-pressure-synthesized chiral magnets Mn1-xRhxGe
We report on the structural, magnetic, and transport properties of a set of high-pressure-synthesized compounds Mn1-xRhxGe (0≤x≤1) with chiral magnetic ordering. The magnetic and transport properties depend substantially on the concentration of rhodium (x) and the pressure. The saturation magnetic moment corresponds to a known high-spin value for pristine MnGe (x=0) and decreases almost linearly with increasing concentration x. In addition, x-ray magnetic circular dichroism spectra taken at 10 K and 2 T indicate magnetic polarization of the Rh 4d electron states and Ge 4p states, which decreases with x, too. In rhodium-rich compounds (x≥0.5), the temperature of the magnetic ordering increases significantly with pressure, whereas in manganese-rich compounds (x<0.5) the temperature decreases. Three different tendencies are also found for several structural and transport properties. In the intermediate range (0.3≤x≤0.7), samples are semiconducting in the paramagnetic phase, but they become metallic in the magnetically ordered state. We carried out ab initio density-functional calculations of Mn1-xRhxGe at various concentrations x and traced the evolution of the electronic and magnetic properties. The calculation results are in good agreement with the measured magnetic moments and qualitatively explain the observed trends in transport properties. © 2018 American Physical Society
Split of the magnetic and crystallographic states in FeRhGe
We report on a comprehensive experimental and theoretical study of
FeRhGe compounds, within the entire concentration range , using X-Ray diffraction, small-angle neutron
scattering, magnetometry and theoretical calculations. While FeGe and RhGe are
single phase helimagnet and unconventional superconductor, respectively, an
internal splitting of the crystallographic and magnetic states is found for
intermediate compositions . A theoretical
analysis of the stability of the two detected phases, together with the
experimental data, indicate that this splitting preserves a common space group
and occurs within single crystallites. Despite their apparent similarity, these
two phases however display different magnetic structures, with distinct ferro-
and helimagnetic character
The TGV II Experiment (Phase I Results)
International audienceThe TGV II (Telescope Germanium Vertical) facility is a low background spectrometer operated in Modane Underground Laboratory. It aims at the study of double electron capture of 106Cd. The spectrometer is composed of 32 HPGe planar detectors interleaved with thin‐foil samples made of Cd‐106 enriched to 75% (total mass about 10 g). In 2006, the main run of phase I (1 year duration) was terminated yielding a new limit on half‐life for two‐neutrino double electron capture (g.s.→g.s.) in 106Cd as 2.0×1020 years. This limit is significantly higher (by almost three orders of magnitude) than those already published. © 2007 American Institute of Physic