Results 1 - 10 of 914
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[en] We propose a new method for γ-direction measurements for the CsI calorimeter of the E391 experiment. This method is based on using the GRRBF neural network. By using this method, the sensitivity of the E391 experiment could be significantly increased. Current results could be applied to other experiments in which the same γ detector is used.
[en] The Darboux transformation operator technique is applied to the generalized Schrodinger equation with a position-dependent effective mass and with linearly energy-dependent potentials. It is shown how to construct the quantum well potentials in nanoelectronic with a given spectrum. The method is illustrated by several examples.
[en] We analyze the possibility of experimental investigation of new low-energy relations between the values of resonance masses in the meson form factors and the differential rate of radiative kaon decay K+ → π+ e+ e-(μ+μ-) at the current level of the experimental precision. A set of arguments is listed in favor that these relations can be a consequence of weak static interactions in the Standard Model.
[en] Human erythrocyte membrane damage under the impact of γ radiation on blood suspension is studied in a wide dose range (2–1000 Gy, irradiation dose rate 2.75 Gy/min). It is shown that the irradiation in the absorbed dose range from 600 Gy and higher results in hemolysis of erythrocytes immediately (or within several hours) after irradiation, and the value of the hemolysis rate constant increases with increasing absorbed dose. For finding hidden membrane damage occurring several hours after irradiation with smaller doses, the suspension was affected by a high voltage pulsed electric field (PEF). It is shown that, for an absorbed dose range from 2 to ∼350 Gy, no noticeable increase in the erythrocyte hemolysis rate was observed after the action of PEF on the suspension, as compared to the nonirradiated suspension. This testifies that, in this dose range, the degree of membrane damage is small and practically independent of absorbed dose value. For doses from 400 to ∼550 Gy, a noticeable increase in the hemolysis rate after the action of PEF growing with increasing absorbed dose was observed.
[en] The low-lying spectrum of 8He was studied in the 3H(6He, p)8He transfer reaction for small center of mass angles. The 0+ ground state (g.s.) of 8He and excited states, 2+ at 3.6–3.9 MeV and (1+) at 5.3–5.5 MeV, were populated with cross sections of 200, 100–250, and 90–125 μb/sr. Some evidence for the excited state at about 7.5 MeV can be found in the data. The possible nature of the near-threshold anomaly above 2.14 MeV in 8He is related to the population of a 1- continuum (soft dipole excitation) with a peak energy value at about 3 MeV. This assumption can probably resolve the problem of a large uncertainty existing in the experimental data on the 8He 2+ state energy.
[en] Cross sections of scalar mesons f0(980), a0(980), and σ(600) production by colliding electron-positron beams are calculated. Two-photon decay widths of scalar mesons obtained in the Nambu-Jona-Lasinio model are used with quark and meson loops taken into account.
[en] This paper is devoted to the study of the combined description of local and nonlocal matter fields in the framework of quantum electrodynamics. Additionally considering the properties of inseparability of the ideas of charge and mass for fundamental particles and the indifference of electromagnetic forces to structure-forming interactions, which had a hidden character in the local theory, provided the conservation in the unchanged form of the group of local gauge symmetries and the correct transition beyond the framework of the local theory. The structural limit of local consideration, which does not violate the results previously obtained in the framework of the local theory, is studied. The general properties of the regular part of the generalized pole amplitude are discussed.
[en] The behavior of disordered isolated volumes (zones) in InP under electron action was characterized by TEM observations. The total areal fraction of the disordered zones in initial InP pre-irradiated by 100 keV heavy Au ions decreased as a function of irradiating electron fluence (time of TEM electron beam irradiation) within all the investigated electron energy range (100–300 keV), Disappearance of disordered zones shows that these zones are sensitive to electron beam irradiation and recover even under electron energies not sufficient to directly elastically displace lattice atoms In and P.
[en] Over the last decade there has been significant progress in developing the concepts and technologies needed to produce, capture, accelerate and collide high intensity beams of muons. At present, a high-luminosity multi-TeV muon collider presents a viable option for the next generation lepton-lepton collider, which is believed to be needed to fully explore high energy physics in the era following LHC discoveries. Such a collider can offer superb energy resolution, smaller size, and potentially cost and power consumption compared to multi-TeV e+ e- linear colliders. This article briefly reviews the motivation, design and status of accelerator R&D for Muon Collider and Neutrino Factory.
[en] We have developed the baseline design for the straw drift tube tracking detectors for high-rate environment application. The low-mass inner straw elements and the technology of the multianode straws assembly were devised and checked. The prototype chamber was constructed and studied. The granularity of similar chambers can be reduced to 1 cm2.