The existence of an axion (a hypothetical pseudoscalar boson) was originally considered as a consequence of sponatneous breaking of newly introduced chiral symmetry, which was suggested in 1977 by R. Peccei and H. Quinn in attempt to solve the strong CP problem. The interactions of axion with ordinary matter are described via the effective coupling constants that are inversely proportional to...
Over the last decades, our knowledge on Neutron Stars (NS) has been greatly advanced: NS with large masses were discovered, radii of a number of NS were measured, and a gravitational signal from the merger of two NS was observed. These data establish significant restrictions on the equation of state of the NS matter and pose new problems for the theory of nuclear matter [1,2].
Many authors...
The response function of the recoil nuclei in the detectors designed to detect neutrinos or dark matter particles can be determined only by using a neutron source with known energy spectrum. Therefore, the development and creation of a calibration neutron source is an important task for a number of current and future nuclear and astrophysical experiments [1, 2]. The neutron source has to be...
ELECTRON PARAMAGNETIC DATING OF FOSSIL TOOTH FOUND AT THE AGHSTAFA DISTRICT IN AZERBAIJAN
Mammadov S.G., Ahadova A.S.
Institute of Radiation Problems, Azerbaijan National Academy of Sciences, Baku Az1143, Azerbaijan
aybaniz.ahadova@mail.ru
At present, the study of an archaeological site without the associated radioisotope research methods is an anachronism. As many geoarchaeologists...
$^1$ NRC “Kurchatov institute” – ITEP, Moscow, 117218, Russia;
$^2$ National Research Center “Kurchatov institute”, Moscow, 123182, Russia.
First observation of neutron star merger and registration of heavy elements presence in this process [1] confirmed our understanding that main scenario for the r-process is connected with the ejecta during neutron star merger (NSM) at the end of close...
Machine Learning (ML) have been widely applied in the High Energy Physics (HEP) to help physical community to solve complex problem in classification and analysis. Here we describe application of ML to solve the problem of classification background and signal events in DEAP-3600 experiment (SNOLAB, Canada) that constructed to search WIMP particles. We apply Boosted Decision Trees (BDT) method...
In this work, we consider a beyond the Standard Model (SM) framework, based on the non-abelian discrete group $\Delta(27)$ to explain the observed non-zero reactor mixing angle $\theta_{13}$. The deviation from the tri-bimaximal (TBM) neutrino mixing pattern, in the context of the type-I seesaw is realized by including new particles to the SM particle content, which thus provides non-zero...
Precise knowledge of forbidden transition beta-spectra plays a significant role in both nuclear and particle physics.
In this work we present a precision measurement of the beta-spectrum shape for $^{210}$Bi (historically RaE) performed with spectrometers based on semiconductor Si(Li) detectors. This first forbidden non-unique transition has the transition form-factor strongly deviated...
Precision measurements of $\beta$-spectra have always been and are still playing an important role in several fundamental physical problems, predominantly in neutrino physics. In Petersburg Nuclear Physics Inst. NRC KI, the $\beta$-spectra of $^{144}{\rm{Ce}}-^{144}{\rm{Pr}}$ nuclei were measured with aim to determine the spectrum of electron antineutrinos. The artificial source of...
Modern experiments with aim of investigation or search of ultra-rare events, for example neutrino or dark matter interaction within a low background detector, place high demands for the radiation purity of the materials used, even for those used in small quantities. These include materials used for soldering elements in detector systems, i.e. a solder and flux. Radioactive purity of the...
In recent years, studies based on the application of the natural sciences methods on archaeological research have become increasingly important. The number of research programs on studying the cultural heritage of various eras is increasing. Still continues the development of different modern techniques for non-destructive analysis of the elemental and structural composition of ancient...
