Alexander Nozik

Alexander Nozik


Research Groups

Biography

Born in 1985 in Moscow, graduated from "2-nd school" lyceum in 2002. Obtained bachelor (2006) and master (2008) degree at MIPT. Started working in INR RAS from 2004. In 2012 successfully defended phd thesis (particle physics) on the analysis of data from "Troitsk nu-mass" experiment in search for mass of electron neutrino. From that time worked in different particle physics collaborations. In 2013 began teaching general physics (and later, special coerces on statistics and scientific programming) at MIPT. In 2017 together with Lev Inzhechik formed a nuclear physics methods group at MIPT, which in the beginning of 2019 was transformed into a laboratory.

Professional Activity

Specialist in neutrino physics, data analysis in physical experiments, and the development of scientific software. The primary achievement in physics is the best limit on electron neutrino mass and sterile neutrino mixing for masses up to 1 keV based on "Troitsk nu-mass" data. Currently a member of "Troitsk nu-mass", IAXO (axion search), and BAT (Bayesian analysis toolkit) collaborations.

ORCID

ResearchGate

Scopus Author ID: 24071435300

Publications

Relativistic runaway electron avalanches within complex thunderstorm electric field structures

December 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.

JGR Atmospheres

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Design of the Event Metadata System for the Experiments at NICA

September 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. 

Physics of Particles and Nuclei Letters

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Electron evaporation from magnetic trap in Troitsk nu-mass experiment

May 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.

Journal of Instrumentation

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Prototype of a segmented scintillator detector for particle flux measurements on spacecraft

September 2020

JINST

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Declarative analysis in “Troitsk nu-mass” experiment

April 2020

Journal of Physics Conference Series

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Kotlin language for science and Kmath library

October 2019

AIP Conference Proceedings

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Shape-based event pileup separation in Troitsk nu-mass experiment

August 2019

JINST

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Statistical time analysis for regular events with high count rate

June 2019

JINST

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Designing Proton and Electron Detector for Monitoring Solar Cosmic Rays

January 2019

Bulletin of the Lebedev Physics Institute

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Measurements with a TRISTAN prototype detector system at the "troitsk nu-mass" experiment in integral and differential mode

2019

JINST

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Physics potential of the International Axion Observatory (IAXO)

2019

JCAP

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Reactor like TGE model

2019

AIP Conference Proceedings

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Direct Search for keV-Sterile Neutrino in Nuclear Decay. Troitsk Nu-Mass (Scientific Summary)

2019

JETP Letters

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Processing of higher count rates in Troitsk nu-mass experiment

January 2018

The European Physical Journal Conferences

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Application of Turchin's method of statistical regularization

January 2018

The European Physical Journal Conferences

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DataForge: Modular platform for data storage and analysis

January 2018

The European Physical Journal Conferences

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