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New laser dyes based on derivatives of 3-(2-benzimidazolyl)coumarin are proposed that lase under lamp and coherent (nanosecond
and microsecond) pumping in the spectral range 420–700 nm and feature a high generation efficiency reaching 40% under coherent
pumping (1% when lamp-pumped) and an increased operational life that surpasses that for most popular laser dyes. The nature
of the substituents in the 6- and 7-positions of the coumarin ring and the ionic structure of the dyes are found to influence
their spectral and lasing characteristics. 相似文献
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I. Alekseev V. Belov V. Brudanin M. Danilov V. Egorov D. Filosofov M. Fomina Z. Hons A. Kobyakin D. Medvedev R. Mizuk E. Novikov A. Olshevsky S. Rozov N. Rumyantseva V. Rusinov A. Salamatin Ye. Shevchik M. Shirchenko Yu. Shitov A. Starostin D. Svirida E. Tarkovsky I. Tikhomirov E. Yakushev I. Zhitnikov D. Zinatulina 《Physics of Particles and Nuclei Letters》2014,11(4):473-482
DANSSino is a reduced pilot version of a solid-state detector of reactor antineutrinos (to be created within the DANSS project and installed under the industrial 3 GWth reactor of the Kalinin Nuclear Power Plant—KNPP). Numerous tests performed at a distance of 11 m from the reactor core demonstrate operability of the chosen design and reveal the main sources of the background. In spite of its small size (20 × 20 × 100 cm3), the pilot detector turned out to be quite sensitive to reactor antineutrinos, detecting about 70 IBD events per day with the signal-to-background ratio about unity. 相似文献
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Alekseev I. G. Belov V. V. Brudanin V. B. Guzeev G. G. Danilov M. V. Egorov V. G. Zhitnikov I. V. Zinatulina D. R. Kazartsev S. V. Kobyakin A. S. Kuznetsov A. S. Machikhiliyan I. V. Medvedev D. V. Nesterov V. M. Olshevsky A. G. Pogorelov N. A. Ponomarev D. V. Rozova I. E. Rumyantseva N. S. Rusinov V. Yu. Samigullin E. I. Svirida D. N. Skrobova N. A. Starostin A. S. Tarkovsky E. I. Filosofov D. V. Fomina M. V. Khvatov V. A. Chapaev V. M. Shevchik Ye. A. Shirchenko M. V. Shitov Yu. A. 《Physics of Atomic Nuclei》2019,82(5):415-424
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.
相似文献4.
I. G. Alekseev V. V. Belov M. V. Danilov I. V. Zhitnikov A. S. Kobyakin A. S. Kuznetsov I. V. Machikhiliyan D. V. Medvedev V. Yu. Rusinov D. N. Svirida N. A. Skrobova A. S. Starostin E. I. Tarkovsky M. V. Fomina E. A. Shevchik M. V. Shirchenko 《Physics of Particles and Nuclei Letters》2018,15(3):272-283
Apart from monitoring nuclear reactor parameters, the DANSS neutrino experiment is aimed at searching for sterile neutrinos through a detailed analysis of the ratio of reactor antineutrino spectra measured at different distances from the reactor core. The light collection system of the detector is dual, comprising both the vacuum photomultiplier tubes (PMTs) and silicon photomultipliers (SiPMs). In this paper, the techniques developed to calibrate the responses of these photodetectors are discussed in detail. The long-term stability of the key parameters of the detector and their dependences on the ambient temperature are investigated. The results of detector light yield measurements, performed independently with PMTs and SiPMs are reported. 相似文献
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