Industrial Reactor Power Monitoring Using Antineutrino Counts in the DANSS Detector

Detection of antineutrino by the reaction of the inverse β-decay can be used for an independent monitoring of a nuclear reactor power. DANSS detector is located directly under a commercial WWER-1000 reactor and counts up to 5000 antineutrino per day, providing the accuracy of 1.5% in 2 days of the flux measurement. A powerful system of the passive and active shielding in combination with the fine spatial segmentation of the detector allows to diminish the contribution of the background processes to a level, negligible in comparison to the statistical error. The influence of the nuclear fuel composition on the neutrino flux can be accounted for based on the input from the NPP staff.

     

Some characteristic features of a molecular nitrogen-ion laser

Measurements are made of the spectral and amplifying characteristics of a molecular nitrogen-ion laser operating at high pressures where the gain line is determined by the overlapping of several spectral lines. Computer modeling was used to calculate the following laser parameters: the unsaturated gain, the linear loss coefficient, the population inversion, and the saturation parameter. I. I. Polzunov State Technical University, Altai. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 30–34, November, 1998.