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[en] An account is given of the experimental work carried out by the author and his associates during the years 1939 through 1943, which produced the first unambiguous evidence of the spontaneous decay of 'mesotrons', showed that this decay occurred according to an exponential law, as expected, and measured the mean life with a 3% accuracy. A by product of this work was a verification of the relativistic equation for the dilation of time intervals. (orig.)
[en] The MACRO detector, located in the underground Gran Sasso Laboratory, had its initial data run from February 27 to May 30, 1989, using the first supermodule (SΩ ≅ 800 m2 sr). Approximately 245000 muon events were recorded. Here are reported the results of the analysis of penetrating muons which determine the measured vertical muon flux at depths greater than 3000 m.w.e. In addition the data have been used to search for large scale anisotropies. (orig.)
[en] An analysis has been made of three million muons with known energy and arrival direction. After appropriate corrections, the muons were sorted into four bins with respect to their production energy, and each group was investigated for narrow-angle anisotropies. Directional isotropy is found, but three peculiar deviations are also found at a 1-3 percent confidence level. 12 references
[en] Description of a shower at the primary energy of ∼1020 eV, registered at the Yakutsk facility is presented. Analysis of the muon content in showers for a wide interval of primary energy and zenith angles is performed
[en] Earth is constantly bombarded with the cascade of neutrinos and cosmic rays. As a result of their interaction with the molecules in the atmosphere, they produce a number of secondary particles like pions and kaons. These secondary mesons can decay to muons. In this paper, we report the study of interactions of cosmic ray muons with a lead block and the characteristics of secondary neutrons and photons produced as a result of this. The significance of the study comes because these particles especially neutrons can't be tagged while conducting the experiment. They mimic the original signal and thus pose a challenge to the experimenter. We aim to find a solution to reduce this background for low energy experiments
[en] In this article, we are reporting cosmic ray muon decay rate using two and three coincidence method and using plastic scintillation detectors. We obtained that the decay rate of muons is higher for the materials having high density or having large atomic number. (author)
[en] We report here on the underground muon flux from the direction of Cyg X-3, as measured by the Soudan I detector from 1981 to 1988. The data described here were collected in two intervals - September, 1981 through November, 1983 (the data reported previously) and May, 1985 through August, 1988 (data not previously published). The life-time for the first interval is 0.94 years and for the second interval, the life-time is 1.61 years. The area of the Soudan 1 detector is ≅ 8 m2. (orig./HSI)
[en] The method of recalculation from the muon multiplicity spectrum to the extensive air showers spectrum vs the total muon number, nμ, is presented. The method allows the direct comparison of data obtained in different experiments with muon groups. The direct comparison of the data at nμ > 1800 and nμ = 75 - 650 has been carried out. The data in the region nμ = 75 - 3500 agree better with assumption that the slope change in the energy spectrum of primary cosmic rays occurs at the same energy per nucleus Ec ≅ 3 · 1015 eV and the mass composition in energy range 1015 - 1017 eV is close to the one observed at 1014 eV
[en] A 10 kilo-tonne dual-phase liquid argon TPC is one of the detector options considered for the Deep Underground Neutrino Experiment (DUNE). The detector technology relies on amplification of the ionisation charge in ultra-pure argon vapour and offers several advantages compared to the traditional single-phase liquid argon TPCs. A 4.2 tonne dual-phase liquid argon TPC prototype, the largest of its kind, with an active volume of \three has been constructed and operated at CERN. In this paper we describe in detail the experimental setup and detector components as well as report on the operation experience. We also present the first results on the achieved charge amplification, prompt scintillation and electroluminescence detection, and purity of the liquid argon from analyses of a collected sample of cosmic ray muons.
[en] A partially loaded dry storage cask was imaged using cosmic ray muons. Since the cask is large relative to the size of the muon tracking detectors, the instruments were placed at nine different positions around the cask to record data covering the entire fuel basket. We show that this technique can detect the removal of a single fuel assembly from the center of the cask.