Alexander NozikMoscow Institute of Physics and Technology | MIPT
Alexander Nozik
PhD
About
56
Publications
57,050
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1,499
Citations
Introduction
I am currently working on DataForge project: a JVM framework for analysis of complicated experimental data.
Additional affiliations
May 2019 - March 2020
Position
- Senior Researcher
Description
- Deputy head of nuclear physics methods laboratory
September 2013 - present
September 2012 - present
Education
September 2002 - July 2008
Publications
Publications (56)
In this paper we present the details of our previously published results for
a search for an additional neutrino mass state in $\beta$-electron spectrum
from the Troitsk nu-mass experiment. Here we present steps of the analysis,
show a set of likelihood functions obtained for each additional heavy mass
value. We demonstrate how systematic errors we...
![FIG. 2: Final states spectrum in molecule T 3 He [10]. Every bin is a...](profile/Sergey-Zadorozhny/publication/51961903/figure/fig8/AS:667067321704448@1536052651016/Final-states-spectrum-in-molecule-T-3-He-10-Every-bin-is-a-summand-in-eq-3_Q320.jpg)
![Figure 3The shape of the electron energy loss spectrum in tritium [10]....](profile/Sergey-Zadorozhny/publication/51961903/figure/fig2/AS:285121816088576@1444989746118/The-shape-of-the-electron-energy-loss-spectrum-in-tritium-10-Different-curves_Q320.jpg)
An electron antineutrino mass has been measured in tritium beta-decay in the
"Troitsk nu-mass" experiment. The setup consists of a windowless gaseous
tritium source and an electrostatic electron spectrometer. The whole data set
acquired from 1994 to 2004 was reanalysed. A thorough selection of data with
the reliable experimental conditions has been...
We propose a new experiment to search for a sterile neutrino in a few keV
mass range at the "Troitsk nu-mass" facility. The expected signature
corresponds to a kink in the electron energy spectrum in tritium beta-decay.
The new goal compared to our previous experiment will be precision spectrum
measurements well below end point. The experimental in...
This study introduces a model selection technique based on Bayesian information criteria for estimating the number of components in a mixture during Diffusion-Ordered Spectroscopy (DOSY) Nuclear Magnetic Resonance (NMR) data analysis. As the accuracy of this technique is dependent on the efficiency of parameter estimators, we further investigate th...
Development of energy-efficient and high-performance bioreactors requires progress in methods for assessing the key parameters of the biosynthesis process. With a wide variety of approaches and methods for determining the phase contact area in gas–liquid flows, the question of obtaining its accurate quantitative estimation remains open. Particularl...
A novel approach to the remote-control system for the compact multi-crystal energy-dispersive spectrometer for X-ray emission spectroscopy (XES) applications has been developed. This new approach is based on asynchronous communication between software components and on reactive design principles. In this paper, the challenges faced, their solutions...
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 paper shows that a non-uniform electric field geometry can lead to the new RREAs multip...
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, wh...
A novel approach to the remote-control system for the compact multi-crystal energy-dispersive spectrometer for x-ray emission spectroscopy (XES) applications has been developed. This new approach is based on asynchronous communication between software components and on reactive design principles. In this paper, we identify the challenges we have fa...
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 paper shows that a non-uniform electric field geometry can lead to the new RREAs multip...
A bstract
This article describes BabyIAXO, an intermediate experimental stage of the International Axion Observatory (IAXO), proposed to be sited at DESY. IAXO is a large-scale axion helioscope that will look for axions and axion-like particles (ALPs), produced in the Sun, with unprecedented sensitivity. BabyIAXO is conceived to test all IAXO subsy...
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 additi...
This paper is dedicated to simulation of so-called trapping-effect observed in Troitsk nu-mass experiment. The effect is caused by magnetic trapping of decay electrons in the windowless gaseous tritium source and the gradual of evaporation of those electrons. As a result, alongside regular tritium beta-spectrum electrons, we see additional electron...
Relativistic runaway electron avalanches (RREAs) developing in electrified clouds produce gamma radiation which could be observed both on the ground surface and on near-Earth orbit. Radio emission of RREAs is a much less studied manifestation of the avalanche process. Meanwhile, VHF-radiation can be used as an additional source of information on co...
The connection between thunderstorms and relativistic runaway electron avalanches is an important topic that has attracted the attention of many researchers. Among other things, there are a lot of various simulations of the dynamics of electron avalanches. This article was written mostly in response to the article "The critical avalanche of runaway...
This article describes BabyIAXO, an intermediate experimental stage of the International Axion Observatory (IAXO), proposed to be sited at DESY. IAXO is a large-scale axion helioscope that will look for axions and axion-like particles (ALPs), produced in the Sun, with unprecedented sensitivity. BabyIAXO is conceived to test all IAXO subsystems (mag...
In this paper, we introduce a laboratory prototype of a solar energetic particle (SEP) detector which will operate along with other space-based instruments to give us more insight into the SEP physics. The instrument is designed to detect protons and electrons with kinetic energies from 10 to 100 MeV and from 1 to 10 MeV respectively. The detector...
The connection between thunderstorms and relativistic runaway electron avalanches is an important topic that has attracted the attention of many researchers. Among other things, there are a lot of various simulations of the dynamics of electron avalanches. This article was written mostly in response to the article "The critical avalanche of runaway...
In this paper we introduce a laboratory prototype of a solar energetic particle (SEP) detector which will operate along with other space-based instruments to give us more insight into the SEP physics. The instrument is designed to detect protons and electrons with kinetic energies from 10 to 100 MeV and from 1 to 10 MeV respectively. The detector i...
The modern scientific data processing is not only a collection of powerful algorithms but also a whole infrastructure of facilities for data reading, processing, and results output. As the amount of data grows, so grows a need for automation of the process. The proper automation requires not only improvement of existing frameworks, but also a searc...
Terrestrial gamma flash (TGF) and thunderstorm ground enhancements(TGE) phenomena are crucial for understanding of atmosphere breakdown and lightning generation physics. The initial theory was developed by Gurevich and included only runway breakdown description. It was later updated by Babich and Dwayer, but even updated models use a rather simplif...
In this article, we present a brief overview of Kotlin programming language and its potential for applications in scientific tasks. The capabilities of language are then demonstrated on the Kmath library, which is being developed as a base for multi-platform computations in Kotlin.
Sterile neutrinos emerge in minimal extensions of the Standard Model which can solve a number of open questions in astroparticle physics. For example, sterile neutrinos in the keV-mass range are viable dark matter candidates. Their existence would lead to a kink-like distortion in the tritium $\beta$-decay spectrum. In this work we report about the...
Residual flux and angular distribution of high-energy cosmic muons have been measured in two underground locations at the Canfranc Underground Laboratory (LSC) using a dedicated Muon Monitor. The instrument consists of three layers of fast scintillation detector modules operating as 352 independent pixels. The monitor has a flux-defining area of \(...
![Figure 3: The results from our work published in [15] compared to other...](profile/Alexander-Nozik/publication/334468098/figure/fig2/AS:799025066426370@1567513829923/The-results-from-our-work-published-in-15-compared-to-other-experiments_Q320.jpg)
We present a brief review of experimental status in searching for hypothetical sterile neutrino in nuclear decay in laboratory testing. The main idea is based on search for an additional small component in the β-spectrum or a shift in the internal electron conversion energy. For example, in a three-body β-decay it looks like a kink in the continuou...
2019 IOP Publishing Ltd and Sissa Medialab. We review the physics potential of a next generation search for solar axions: the International Axion Observatory (IAXO) . Endowed with a sensitivity to discover axion-like particles (ALPs) with a coupling to photons as small as gaγ∼ 10-12 GeV-1, or to electrons gae∼10-13, IAXO has the potential to find t...
The project of the compact space detector for measuring proton (10–100 MeV) and electron (to 10 MeV) energy spectra in solar cosmic rays is presented. The detector can operate in two modes: differential (each event is reconstructed) and integral (only energy spectrum and radiation composition are reconstructed at a high loading).
We review the physics potential of a next generation search for solar axions: the International Axion Observatory (IAXO). Endowed with a sensitivity to discover axion-like particles (ALPs) with a coupling to photons as small as $g_{a\gamma}\sim 10^{-12}$ GeV$^{-1}$, or to electrons $g_{ae}\sim$10$^{-13}$, IAXO has the potential to find the QCD axio...
Residual flux and angular distribution of high-energy cosmic muons have been measured in two underground locations at the Canfranc Underground Laboratory (LSC) using a dedicated Muon Monitor. The instrument consists of three layers of fast scintillation detector modules operating as 352 independent pixels. The monitor has flux-defining area of 1 m$...
Some of modern models used to describe TGF phenomenon and lightning ignition assume the existence of positive positron or gamma ray feedback. In this article we present some results of Monte-Carlo simulation of electromagnetic avalanches in atmospheric conditions and calculation of gain coefficient for both positron and gamma-ray feedback. The calc...
Nowadays continuous signal digitization becomes a standard procedure in experimental physics. Though, signal pileup separation at high count rate remains a problem. The article presents algorithms for detecting and extracting events based on shape of a single pulse. An example of applied use of the described algorithms is also given on the example...
In physics it is frequently needed to precisely measure the count rate of some process. Quite often one needs to care of electronics dead time, pile-up and other features of data acquisition system to avoid systematic shifts of the count rate. In this article we present a statistical mechanism to diminish or completely eliminate systematic errors a...
The KATRIN (Karlsruhe Tritium Neutrino) experiment investigates the energetic endpoint of the tritium $\beta$-decay spectrum to determine the effective mass of the electron anti-neutrino with a precision of $200\,\mathrm{meV}$ ($90\,\%$ C.L.) after an effective data taking time of three years. The TRISTAN (tritium $\beta$-decay to search for steril...
DataForge is a framework for automated data acquisition, storage and analysis based on modern achievements of applied programming. The aim of the DataForge is to automate some standard tasks like parallel data processing, logging, output sorting and distributed computing. Also the framework extensively uses declarative programming principles via me...
During analysis of experimental data, one usually needs to restore a signal after it has been convoluted with some kind of apparatus function. According to Hadamard's definition this problem is ill-posed and requires regularization to provide sensible results. In this article we describe an implementation of the Turchin's method of statistical regu...
In this article we give a short outline of current status of search for sterile neutrinos with masses up to 4 keV in “Troitsk nu-mass experiment”. We also discuss major sources of systematic uncertainties and methods to lower them.
An approach to calculate the flux of cosmicgenic muons detected by Muon Monitor experiment in lab LAB2400 of the Underground Laboratory in Canfranc (LSC) is described. The measuring apparatus consists of three layers of SC16 scintillation matrix detectors. The hardware function of the detector assembly was determined using computer simulation. Obta...
We present the first measurements of tritium beta-decay spectrum in the electron energy range 16-18.6 keV. The goal is to find distortions which may correspond to the presence of a heavy sterile neutrinos. A possible contribution of this kind would manifest itself as a kink in the spectrum with a similar shape but with end point shifted by the valu...
We've performed precise measurements of electron scattering on molecular hydrogen and deuterium by using the "Troitsk nu-mass" setup. Electrons were generated by the electron gun with an energy line width better than 0.3 eV. The electron energies were 14, 17, 18.7, 19 and 25 keV. The windowless gaseous tritium source (WGTS) was filled by hydrogen i...
We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved - cosmology, astrophysics, nuclear, and particle physics - in each case viewed from both theoretical and experimental/observational perspectives. After reviewing the role of active neutrinos in particle physics, a...
There is a proposal to search for a sterile neutrino in a few keV mass range
by the "Troitsk nu-mass" facility. In order to estimate sterile neutrino mixing
one needs to make precision spectrum measurements well below the endpoint using
the existing electrostatic spectrometer with a magnetic adiabatic collimation,
or MAC-E filter. The expected sign...
We performed a search for any sign of an additional neutrino mass state in
beta-electron spectrum based on data reanalysis of direct electron antineutrino
mass measurements in Tritium beta-decay in the Troitsk nu-mass experiment. The
existing data set allows us to search for such a state in the mass range up to
100 eV. The lowest value at a 95% C.L...
![Fig. 2. Spectrum of final states of the T 3 He molecule [13]. Each...](profile/Sergey-Zadorozhny/publication/255828360/figure/fig6/AS:668503614971919@1536395090592/Spectrum-of-final-states-of-the-T-3-He-molecule-13-Each-column-of-the-histogram_Q320.jpg)
The results obtained in the Troitsk nu-mass experiment by measuring the electron-antineutrino mass in tritium beta decay are presented. The facility used consists of a gaseous windowless tritium source and an electrostatic electron spectrometer involving an adiabatic magnetic collimation. Runs in which measurement conditions were reliably establish...
(The thesis is in russian)
The PhD thesis on the direct search for electron neutrino mass in "Troitsk nu-mass"
experiment (data analysis and systematics).
![Table 1 . Parameters of the 83m Kr conversion line [15]](profile/Sergey-Zadorozhny/publication/226540923/figure/tbl1/AS:669008571424785@1536515481806/Parameters-of-the-83m-Kr-conversion-line-15_Q320.jpg)
Results of searches for effects of space-charge accumulation in the gaseous tritium source in the Troitsk neutrino-mass experiment are presented. The broadening and the shift of the L3 line of conversion electrons in a 83m
Kr gaseous source circulating together with tritium was investigated. The attained limit on the magnitude of fluctuations of th...
Questions
Questions (3)
I need to convert some old student laboratory manual from archaic latex to some structured format like html or epub. From some research into the Web I found that the most advanced tool for that is tex4ht which is by default included in the MikTeX distribution. After some effort (quite a lot in fact) I managed to find a way to run it on my tex file and was relatively satisfied with the result.
Still, the tex4ht is presented as a highly configurable system, but I still can not find any reasonably complete documentation on its configuration. I am coming to a conclusion that there is no complete documentation at all for its features. Does anybody know where to find some help on this matter?
In fact I need to configure following things:
1) Since i am converting formulas to .gif images, I've got quite a lot of them (in the same directory as my tex source and html result). I would like to redirect them to some subdirectory.
2) My source encoding is (sadly) cp1251, and it would be good to have result in unicode, not in iso-8859-5 with a lot of &#x....-s in the page.
3) I understand that tex4ht supports sectioning, index and separate htmls for sections, bu I did not found how to configure this feature.
4) While the gif-s for my formulas are fine in the resulting html, the pictures in the tex are also transformed to gif with some obscure names (which I normally do not need) and are blank (white boxes). I would like to configure the pictures separately form formulas
Does anybody have suggestions on any of these topics?
