The result of the neutrino magnetic moment measurement at the Kalinin Nuclear Power Plant (KNPP) with GEMMA spectrometer is presented. The antineutrino-electron scattering is investigated. A ...high-purity germanium detector with a mass of 1.5 kg placed at a distance of 13.9 m from the 3 GWth reactor core is exposed to the antineutrino flux of 2.7×1013 1/cm2/s. The recoil electron spectra taken in 18134 and 4487 hours for the reactor ON and OFF periods are compared. The upper limit for the neutrino magnetic moment μν< 2.9×10−11μB at 90% C.L. is derived from the data processing.
A technique for producing, adjusting, and testing large-area scintillation detectors (≥1 m
2
) for active cosmic muon shielding in low-background experiments is presented. The detectors developed ...feature a high efficiency (~99.75%) and low light collection inhomogeneity (≤25%); they can be used to construct modular systems for active muon shielding with different coverage areas and the interchangeability of modules. The testing method applied makes it possible to significantly reduce the time of checking light collection inhomogeneity of scintillation panels
Baikal-GVD Experiment Avrorin, A. V.; Avrorin, A. D.; Aynutdinov, V. M. ...
Physics of atomic nuclei,
11/2020, Letnik:
83, Številka:
6
Journal Article
Recenzirano
Baikal-GVD is a deep-underwater neutrino detector of cubic-kilometer scale. It is designed to detect astrophysical neutrinos up to multi-PeV energies and beyond. The deployment of this facility began ...in spring 2015. Since April 2020, the detector includes seven clusters, each consisting of eight strings carrying in total 288 optical modules located at depths of 750 to 1275 m. By the end of the first phase of construction of the detector in 2024, it is planned to deploy 15 clusters, whereby an effective volume of 0.75 km
for detecting high-energy cascades would be reached. The design and status of the Baikal-GVD detector are described in the present article along with selected results of data analysis.
We present data characterizing the performance of the first segmented, N-type Ge detector, isotopically enriched to 85% 76Ge. This detector, based on the Ortec PT62 design and referred to as SEGA ...(Segmented, Enriched Germanium Assembly), was developed as a possible prototype for neutrinoless double beta-decay measurements by the Majorana collaboration. We present some of the general characteristics (including bias potential, efficiency, leakage current, and integral cross-talk) for this detector in its temporary cryostat. We also present an analysis of the resolution of the detector, and demonstrate that for all but two segments there is at least one channel that reaches the Majorana resolution goal below 4 keV FWHM at 2039 keV, and all channels are below 4.5 keV FWHM.
The result of the 3-year neutrino magnetic moment measurement at the Kalinin Nuclear Power Plant (KNPP) with the GEMMA spectrometer is presented. Antineutrino-electron scattering is investigated. A ...high-purity germanium detector of 1.5 kg placed at a distance of 13.9 m from the 3 GW
th
reactor core is exposed to the antineutrino flux of 2.7 × 10
13
cm
−2
s
−1
. The scattered electron spectra taken in (5184 + 6798) and (1853 + 1021) h for the reactor ON and OFF periods are compared. The upper limit for the neutrino magnetic moment μ
v
< 3.2 × 10
−11
μ
B
at 90% CL is derived from the data processing.
The paper shows the results of experimental gamma spectra obtained with a thorium
232
Th target and an aluminum collector irradiated at the JINR Synchrocyclotron with the internal beam of energies of ...100 and 600 MeV. For
232
Th there were identified 258 and 222 gamma lines that belong to 45 and 55 nuclides, respectively. For Al - 238, 330 lines and 81, 119 nuclides, respectively. The cross sections of fragmentation of the
232
Th and Al nuclei under the interaction with protons 100 and 600 MeV was determined. A comparison of the obtained cross sections of the reaction with theoretical calculations was performed.
•Uranium spallation target was irradiated by up to 4AGeV deuteron beams.•Neutron production was investigated through (n,γ), (n,f), and (n,2n) reactions in natU.•Reaction rates were also calculated ...employing the MCNPX 2.7.0 code.•Agreement between experiment and simulation of neutron-induced reactions was found.Overestimation in simulation of production of charged particles is discussed.
A renewed interest in experimental research on Accelerator-Driven Systems (ADS) has been initiated by the global attempt to produce energy from thorium as a safe(r), clean(er) and (more) proliferation-resistant alternative to the uranium-fuelled thermal nuclear reactors. The ADS research has been actively pursued at the Joint Institute for Nuclear Research (JINR), Dubna, since decades. Most recently, the emission of fast neutrons was experimentally investigated at the massive (m=512kg) natural uranium spallation target QUINTA. The target has been irradiated with the relativistic deuteron beams of energy from 0.5AGeV up to 4AGeV at the JINR Nuclotron accelerator in numerous experiments since 2011. Neutron production inside the target was studied through the gamma-ray spectrometry measurement of natural uranium activation detectors. Experimental reaction rates for (n,γ), (n,f) and (n,2n) reactions in uranium have provided valuable information about the neutron distribution over a wide range of energies up to some GeV. The experimental data were compared to the predictions of Monte Carlo simulations using the MCNPX 2.7.0 code. The results are presented and potential sources of partial disagreement are discussed later in this work.
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