The results of measurements of the fission cross sections of 239Pu, 240Pu, and 242Pu nuclei by neutrons in the energy range from 0.3 to 500 MeV carried out at the GNEIS neutron complex at the Petersburg Nuclear Physics Institute of the National Research Centre “Kurchatov Institute” (PNPI, Gatchina) are presented.
The effect of low-energy ionizing radiation in the dose range of 5–30 Gy on the biological performance of rapeseed (Brassica napus) seeds was investigated. Presowing irradiation led to an improvement in both germination rate and crop productivity. X-ray irradiation at doses of 15, 20, and 25 Gy increased rapeseed yield by 298, 130, and 202
We have shown that the standard CPT conjugation formulas are inapplicable to chirally asymmetric theories. The QFT formulas for the Lorentz transformations and the C, P, and T conjugations of spinors have been corrected. These ensure the correct unitarity or antiunitarity of discrete transformations and the chirality of the results.
Compiling experimental data on nuclear reactions for the EXFOR International Library is a priority for the Center of Nuclear Physics Data at the All-Russian Research Institute of Experimental Physics. For this purpose, the EXFOR-Editor software package was developed. A description of the package is given. A new data processing mode—the creation of a Trans exchange file for transfer to the EXFOR library—is presented.
The reaction involving the production and decay of the 8Be* nucleus is examined in the interaction of fast neutrons with an energy above 3 MeV with a 10B nucleus. The study is conducted using a multidetector setup comprising a position-sensitive neutron detector and a pair spectrometer for electrons and positrons operated at the RADEX neutron channel at the Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS). To this end, events with the emission of a secondary 3H nucleus and a photon are identified along with rare events involving the emission of an e+e– pair. An estimate is obtained for the contributions of transitions of various multipolarities from the excited state of the 8Be nucleus to the ground state in the internal conversion of an electron–positron pair.
