Том 87, № 1 (2024)

²³⁵U, ²³⁸U, ²³⁹Pu and ²⁴¹Pu antineutrino spectra were obtained from the measurement done by the near detector in Double Chooz experiment. Method of converting the experimental positron spectrum into the antineutrino one has been developed. The spectrum conversion function obtained from Monte Carlo calculations is used. The experimental antineutrino spectrum taken by this method corresponds to a certain fuel composition of a nuclear reactor core in parts of fission. It is possible to split the experimental antineutrino spectrum on nuclear fuel components spectra. Nuclear fuel individual isotope antineutrino spectra from uranium and plutonium were fitted by the calculated ones obtained by summation of individual fragment spectra. In the calculation, a strength function was used to describe the probability distribution of beta transitions for unknown fragments. The most accurate experimental cross sections of inverse beta decay reaction measured in a number of experiments are consistent with sections calculated on base of our experimental and calculated ²³⁵U, ²³⁸U, ²³⁹Pu and ²⁴¹Pu antineutrino spectra.

A comparison of the accuracy of reconstruction of the shower size and coordinates of the axes of extensive air showers based on the response of the NEVOD-EAS array are presented. The reconstruction is based on various functions of the lateral distribution of particles. A comparison of the lateral distribution of EAS particles according to MC and experimental data is given.

This paper studies the dynamics of proton flux in the South Atlantic Anomaly (SAA) region according to “ARINA” (was operated on the Resurs-DK1 satellite from 2006 to 2015) and “VSPLESK” (which was mounted on the ISS from 2008 to 2013) satellite experiment data. Both spectrometers have the same scheme. The SAA drift is determined by the position of the maximum flux of high-energy protons with energies in the range from 30 to 100 MeV at the altitude of the Resurs-DK1 satellite (about 350–600 km) and the ISS (380–420 km). Part of the time the instruments operated simultaneously.

The detailed analytical calcualtion of one-loop electromagnetic radiative corrections (ERC) in Møller scattering beyond ultrarelativistic approximation (taking into accout all masses) is presented. The infrared divergence (IRD) is extracted using the covariant Bardin–Shumeiko approach. The succesful numerical comparison of radiative effects with the well-known results using for IRD extraction alternative approaches is done in the wide kinematical range. A kinematic region is found in which it is needed to avoid the ultrarelativistic effects in order to get the exact estimation of radiative effects.