
Александр Нозик
Биография
Родился в 1985 в Москве. Окончил лицей "Вторая Школа" в 2002, после чего поступил в МФТИ на факультет проблем физики и энергетики. С 2004 года начал участвовать в научной работе ИЯИ РАН на эксперименте "Троицк ню-масс". Успешно защитил бакалаврский и магистерский диплом, а в 2012 году кандидатскую диссертацию по физике частиц на тему "Результаты обработки данных эксперимента "Троицк ню-масс" по прямому измерению массы электронного нейтрино". После этого успешно работал в разных международных коллаборациях по физике нейтрино и смежным вопросам. С 2013 преподает в МФТИ общую физику, статистику и научное программирование. В 2017 совместно со Львом Инжечиком сформировал научную группу методов ядерно-физических экспериментов. В 2019 году группа получила статус лаборатории.
Профессиональная активность
Специалист по физике нейтрино, анализу данных в физических экспериментах и разработке научного программного обеспечения. Главное достижение - получение лучших пределов на массу электронного нейтрино и смешивание стерильного нейтрино с массой до 1 КэВ с электронным на основании данных "Троицк ню-масс". В данный момент является членом коллабораций "Троицк ню-масс" (прямой поиск масс нейтрино), IAXO (поиск аксионов) и BAT (пакет для байесовского анализа данных).
Публикации
Relativistic runaway electron avalanches within complex thunderstorm electric field structures
Декабрь 2021
E. Stadnichuk, E. Svechnikova, A. Nozik, D. Zemlianskaya, T. Khamitov, M. Zelenyy, M. Dolgonosov
Relativistic runaway electron avalanches (RREAs) are generally accepted as a source of thunderstorms gamma ray radiation. Avalanches can multiply in the electric field via the relativistic feedback mechanism based on processes with gamma rays and positrons. This study shows that a non-uniform electric field geometry can lead to the new RREAs multiplication mechanism—“reactor feedback,” due to the exchange of high-energy particles between different accelerating regions within a thundercloud. A new method for the numerical simulation of RREA dynamics within heterogeneous electric field structures is proposed. Under the assumption that reactor feedback can produce a terrestrial gamma ray flash (TGF), necessary conditions for TGF occurrence in the system with the reactor feedback are derived using the developed analytical description and the numerical simulation. Observable properties of TGFs influenced by the proposed mechanism are discussed.
Design of the Event Metadata System for the Experiments at NICA
Сентябрь 2021
Alexandrov E., Alexandrov I., Degtyarev A., Gertsenberger K., Filozova I., Klimai P., Nozik A.,Yakovlev A.
Information systems of experiments make a significant contribution to solving automation tasks of data collecting, storing, processing and analysis, and are used to support a lot of types of experiment activities. The article is devoted to one of information systems being actively employed in particle collision experiments—Event Metadata System, which provides a database containing information on summary properties of physics events and references to their storage location, and ensures fast search through stored event metadata. The Event Metadata System for the NICA experiments is based on the Event Catalogue and provides recording and managing information being necessary for a convenient search for events required in physics analyses.
Electron evaporation from magnetic trap in Troitsk nu-mass experiment
Май 2021
Nozik A., Hamitov T.
This paper is dedicated to the simulation of the so-called trapping-effect observed in the Troitsk nu-mass experiment. The effect is caused by the magnetic trapping of decay electrons in the windowless gaseous tritium source and the gradual evaporation of those electrons. As a result, alongside regular tritium beta-spectrum electrons, we see additional electrons that are initially trapped in the source and escape it with changed energy. The spectrum of evaporated electrons is quite peculiar (almost flat for monochromatic initial electrons) and could not be directly measured in the experiment. So one has to rely on simulations. Also, it is possible that the same effect could be observed in other cases of magnetic traps. © 2021 IOP Publishing Ltd and Sissa Medialab.
Prototype of a segmented scintillator detector for particle flux measurements on spacecraft
Сентябрь 2020
Declarative analysis in “Troitsk nu-mass” experiment
Апрель 2020
Statistical time analysis for regular events with high count rate
Июнь 2019
Designing Proton and Electron Detector for Monitoring Solar Cosmic Rays
Январь 2019
Measurements with a TRISTAN prototype detector system at the "troitsk nu-mass" experiment in integral and differential mode
2019
Direct Search for keV-Sterile Neutrino in Nuclear Decay. Troitsk Nu-Mass (Scientific Summary)
2019
DataForge: Modular platform for data storage and analysis
Январь 2018
Application of Turchin's method of statistical regularization
Январь 2018
Processing of higher count rates in Troitsk nu-mass experiment
Январь 2018