188 research outputs found
Measurement of - beta-spectra with Si(Li) detectors for the purpose of determining the spectra of electron antineutrinos.
No full textS.V. Bakhlanov, A.V. Derbin, I.S. Drachnev, V.N. Muratova, N.V. Pilipenko, D.A. Semenov, E.V. Unzhakov
St. Petersburg Nuclear Physics Institute National Research Center “Kurchatov Institute”, Gatchina, Russia
The specifications of a newly developed beta-spectrometer, based on full absorption Si(Li) detector and thin transmission detector, are shown. The spectrometer allows to separate effectively beta-radiation and accompanying X-rays and gamma radiation using registration of coincident events from both detectors. The spectrometer can be used for precision measurements of various beta-spectra, namely for the beta-spectrum shape study of 144Pr
^{144}\rm{Pr}
, which is considered to be an advantageous anti-neutrino source for sterile neutrino searches. The preliminary results for beta spectra from 144Ce−144Pr
^{144}\rm{Ce}-^{144}\rm{Pr}
decays and reconstructed antineutrino spectra are presented
Search for resonant absorption of solar axions by nuclei
No full textA.V. Derbin, I.S. Drachnev, Yu.M. Gavrilyuk, A.M. Gangapshev, V.V. Kazalov,V.V.Kuzminov,V.N. Muratova, S.I. Panasenko, S.S. Ratkevich, D.A. Tekueva, E.V.Unzhakov, S.P. Yakimenko
A search for resonant absorption of the solar axions with a wide continuous spectra by nuclei is continued with the krypton proportional counter at the Baksan Neutrino Observatory. Such an absorption should lead to the excitation of low-lying nuclear energy level of . The results obtained after 613 days of measurements allow to constraint on the axion–photon coupling and axion mass for Primakoff solar axions. This bound corresponds to the upper limit on KSVZ axion mass eV. For solar axions produced by Compton and bremsstrahlung like processes the limit on axion-electron coupling and KSVZ axion mass are ~eV and eV, correspondingly (all at 95\% C.L.)
Search for resonant absorption of solar axions by nuclei
No full textA.V. Derbin, I.S. Drachnev, Yu.M. Gavrilyuk, A.M. Gangapshev, V.V. Kazalov,V.V.Kuzminov,V.N. Muratova, S.I. Panasenko, S.S. Ratkevich, D.A. Tekueva, E.V.Unzhakov, S.P. Yakimenko
A search for resonant absorption of the solar axions with a wide continuous spectra by nuclei is continued with the krypton proportional counter at the Baksan Neutrino Observatory. Such an absorption should lead to the excitation of low-lying nuclear energy level of . The results obtained after 613 days of measurements allow to constraint on the axion–photon coupling and axion mass for Primakoff solar axions. This bound corresponds to the upper limit on KSVZ axion mass eV. For solar axions produced by Compton and bremsstrahlung like processes the limit on axion-electron coupling and KSVZ axion mass are ~eV and eV, correspondingly (all at 95\% C.L.)
Eurasianism and M. V. Shakhmatov (Distinction between Viewpoints Revisited)
No full textThe article is dedicated to emigrant historian M. V. Shakhmatov, the creator of the ‘State of Truth’ theory resulting from his analysis of ancient Russian literary and folklore compositions. Its basis was constituted by the concepts of sobornost (‘cooperation’), odinachestvo (‘equality’) and divine nature of political power. Despite present-day studies, it is quite difficult to consider it ‘Eurasianistic’ by nature though its author got a number his works printed in several volumes of the Eurasianists. In his papers there are no such ideas as the ‘outcome to the East’, decisive factor of development place, perception of Russia as Eurasia or the idea of struggle as the driving force of history; finally, there was no Eurasianistic understanding of the benefits of the Mongol invasion. Ideologists of Eurasianism considered M. V. Shakhmatov to be a temporary companion of theirs who was used merely as a ‘specialist’. In turn, he declared his break with them. In general, his views can be rather attributed to the revival of Slavophile ideas about the uniqueness of Russia’s historical path and its sharp contrast to the West. They stemmed not from the Eurasianistic movement but from personal searches in the course of work on a master’s thesis on the history of ancient political ideas.The article analyzes M. V. Shakhmatov’s views, the circumstances of the appearance of his works in the Eurasianistic Vremennik, reflects the Eurasianists’ opinions about the author contained in the correspondence of G. V. Florovsky to N. S. Troubetzkoy, N. S. Troubetzkoy to P. P. Sovchinski. This correspondence has not been taken into account by previous researchers of M. V. Shakhmatov’s works which resulted in somewhat incorrect conclusions. Given the relevance of the study of Eurasianism as a whole, and the Eurasianistic concept of Russian history in particular, the distinction between viewpoints of M. V. Shakhmatov and Eurasianists will allow to avoid many errors in future publications. It may contribute to further detailed consideration of Eurasianistic compositions by representative of the 1920–1930s Russian emigration
Chaotic Representation of the Relationships between Princes in the Ancient Rus’
No full textThe review analyses the monograph by D. A. Borovkov “Relationships between princes in Rus’
in the late X — in the first quarter of the XII century and their representation in the sources and
historiography”. The work professes to contain general conclusions with respect to the research
topic, which is a pivotal topic in the Russian historiography of the middle ages. The author aims
at “reconsidering the question of the essence of the relationships between princes during the
initial stage of their development with a view to determining the degree of correspondence between
the “material of the sources” and any of the historiographical theories related to the field of
research, if possible”. This is where the main drawback of the monograph lies. The historiographical
theories the monograph refers to are not substantiated; contain numerous errors, gaps; often
represent frequently confused phrases and conclusions. The historical part of the work looks
better. The author sometimes boldly resolves minor issues relating to, for example, the questions
about where and when a particular prince reigned. However, the author, more often relies on
the opinion of A. A. Shakhmatov, trusting him a priori, or refers to the textual reconstructions of
other researchers. Thus, the monograph presents a skillful compilation from historiographical
conclusions by many researchers. The findings of Borovkov are the following. The relationships
between princes in Rus’ since the first division of principalities by Svyatoslav Igorevich in 970 are
presented as the development of collective co-ownership where the members of the princely
family, who had the right to participate in management, were equal. Only at the turn of the
XI–XII centuries the doctrine of the priority of “the oldest brother”, which the sources was associated
with the preceding period, was formulated in Pechersk monastery. However, the struggle
of “younger” princes for their rights made the “votchinny” (patrimonial) principle of succession
proclaimed as the official doctrine at the Council of Liubech in 1097 politically relevant during
that period. The princes’aspirations to individual power was perceived negatively. It remains unclear
to the reviewer where the author reconsiders the questions of the essence of the relationships
between princes and why he arrives at the final conclusion, contradicting the whole work,
that the relationships between princes in Rus’ can be characterized as kinship
The problem of the supreme political authority in the Ancient Rus’ in the works of russian émigré legal historians in harbin
No full textThe paper deals with the views of Russian émigré historians of law in Harbin (G.G. Telberg, K.I. Zaitsev,
N.E. Esperov) regarding the supreme authority in the Ancient Rus’. The author analyses supreme
authority institutes, such as princely power, veche, boyar (princely) duma, and quite a broad range
of related historiography problems, demonstrating what those historians, who taught at the Faculty
of Law at Harbin University in the 1920–30s, had in common and in what ways they differed in their
approaches, as well as finding in their works traces of prerevolutionary historiographical agenda and
outlining their own ways of thinking that were brought to an end by the WWII. The conclusion is that,
even though they belonged to different schools of thought and generations, the Russian historians of
law who ended up in Harbin agreed on the tripartite structure of the supreme authority in the Ancient
Rus’. Refs 18
Search for axioelectric effect of solar axions using BGO scintillating bolometer
No full textA search for axioelectric absorption of solar axions produced in the (Formula presented.) reaction has been performed with a BGO detector placed in a low-background setup. A model-independent limit on the combination of axion-nucleon and axion-electron coupling constants has been obtained: (Formula presented.) for 90 % confidence level. The constraint of the axion-electron coupling constant has been obtained for hadronic axion with masses of (0.1-1) MeV: (Formula presented.). © 2014 The Author(s)
Electrically Active Defects Induced by α‐Particle Irradiation in p‐Type Si Surface Barrier Detector
No full textCAST constraints on the axion-electron coupling
No full textIn non-hadronic axion models, which have a tree-level axion-electron interaction, the Sun produces a strong axion flux by bremsstrahlung, Compton scattering, and axiorecombination, the "BCA processes." Based on a new calculation of this flux, including for the first time axio-recombination, we derive limits on the axion-electron Yukawa coupling gae and axion-photon interaction strength ga using the CAST phase-I data (vacuum phase). For ma <~ 10 meV/c2 we find ga gae < 8.1 × 10−23 GeV−1 at 95% CL. We stress that a next-generation axion helioscope such as the proposed IAXO could push this sensitivity into a range beyond stellar energy-loss limits and test the hypothesis that white-dwarf cooling is dominated by axion emission
Ultra-low-background physics: lessons from BOREXINO and future steps
No full textThe Borexino experiment concluded the data acquisition at the end of 2021 and among the solar neutrino experiments it has been the only one capable of reconstructing the position and the energy on an event-by-event base, with an energy threshold of 150 keV, thanks to its ultra-high radio-purity. The experimental techniques and analysis methods that allowed Borexino to reach such unprecedented levels of radio-purity are now a standard and the legacy that Borexino leaves to the next low energy neutrinos and rare event searching experiments. This contribution is aimed to present the methods and the main achievements of the Borexino and to summarize the broad experimental effort presently in progress in the field of ultra-low background physics to further improve the sensitivity with massive underground detectors and new techniques
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