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Search Results: 1 - 10 of 539281 matches for " A. V. Derbin "
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Search for neutrino oscillations at a research reactor
A. V. Derbin,A. S. Kayunov,V. N. Muratova
Physics , 2012,
Abstract: A project of search for oscillations of reactor neutrinos on a short, 5 - 15 meters, baseline with liquid scintillation position-sensitive detector POSEIDON is described. The oscillations of the electron antineutrinos into sterile neutrinos will be searched at 100 MW research reactor with the size of the active zone of about 0.5 m. The values of the oscillation parameters available for research are in the region $\delta m^2 = (0.3 - 6) \rm{eV}^2$ and $\rm{Sin}^2(2\theta)\geq 0.01$.
Search for Solar Axions Produced in the $p + d \rightarrow\rm{^3He}+ A$ Reaction
A. V. Derbin,A. S. Kayunov,V. N. Muratova
Physics , 2010, DOI: 10.3103/S106287381006016X
Abstract: A search for the axioelectric absorption of 5.5-MeV solar axions produced in the $p+d\rightarrow \rm{^3He}+\gamma(5.5 \rm{MeV})$ reaction was performed with two BGO detectors placed inside a low-background setup. A model independent limit on axion-photon and axion-nucleon couplings was obtained: $|g_{Ae}\times g_{AN}| \leq 3.2\times 10^{-9} (m_A=0)$. Constraints on the axion-electron coupling constant were obtained for axions with masses in the $(0.1-1.0)$ MeV range: $g_{Ae}\leq (1.8-9.0)\times 10^{-7}$. The solar positron flux from $A\rightarrow e^-+e^+$ decay was determined for axions with masses $m_A > 2m_e$. Using the existing experimental data on the interplanetary positron flux, a new constraint on the axion-electron coupling constant for axions with masses in the $(1.2-5.4)$ MeV range was obtained: $g_{Ae} \leq (1-5)\times 10^{-17}$.
On the possiblity of detecting Solar pp-neutrino with a large volume liquid organic scintillator detector
A. V. Derbin,O. Yu. Smirnov,O. A. Zaimidoroga
Physics , 2004, DOI: 10.1134/1.1825531
Abstract: It is shown that a large volume liquid organic scintillator detector with an energy resolution of 10 keV at 200 keV 1 sigma will be sensitive to solar pp-neutrino, if operated at the target radiopurity levels for the Borexino detector, or the solar neutrino project of KamLAND.
Constraints on the axion-electron coupling for solar axions produced by Compton process and bremsstrahlung
A. V. Derbin,A. S. Kayunov,V. N. Muratova,D. A. Semenov,E. V. Unzhakov
Physics , 2011, DOI: 10.1103/PhysRevD.83.023505
Abstract: The search for solar axions produced by Compton ($\gamma+e^-\rightarrow e^-+A$) and bremsstrahlung-like ($e^-+Z \rightarrow Z+e^-+A$) processes has been performed. The axion flux in the both cases depends on the axion-electron coupling constant. The resonant excitation of low-lying nuclear level of $^{169}\rm{Tm}$ was looked for: $A+^{169}$Tm $\rightarrow ^{169}$Tm$^*$ $\rightarrow ^{169}$Tm $+ \gamma$ (8.41 keV). The Si(Li) detector and $^{169}$Tm target installed inside the low-background setup were used to detect 8.41 keV $\gamma$-rays. As a result, a new model independent restriction on the axion-electron and the axion-nucleon couplings was obtained: $g_{Ae}\times|g^0_{AN}+ g^3_{AN}|\leq 2.1\times10^{-14}$. In model of hadronic axion this restriction corresponds to the upper limit on the axion-electron coupling and on the axion mass $g_{Ae}\times m_A\leq3.1\times10^{-7}$ eV (90% c.l.). The limits on axion mass are $m_A\leq$ 105 eV and $m_A\leq$ 1.3 keV for DFSZ- and KSVZ-axion models, correspondingly (90% c.l.).
Search for axioelectric effect of 5.5 MeV solar axions using BGO detectors
A. V. Derbin,S. V. Bakhlanov,I. S. Dratchnev,A. S. Kayunov,V. N. Muratova
Physics , 2013, DOI: 10.1140/epjc/s10052-013-2490-y
Abstract: A search for axioelectric absorption of solar axions produced in the $ p + d \rightarrow {^3\rm{He}}+\gamma (5.5 \rm{MeV})$ reactions has been performed with a BGO detector placed in a low-background setup. A model-independent limit on an axion-nucleon and axion-electron coupling constant has been obtained: $| g_{Ae}\times g_{AN}^3|< 2.9\times 10^{-9}$ for 90% confidence level. The constrains of the axion-electron coupling have been obtained for hadronic axion with masses in (0.1 - 1) MeV range: $|g_{Ae}| \leq (1.4 - 9.7)\times 10^{-7}$.
Search for solar axions produced by Compton process and bremsstrahlung using axioelectric effect
A. V. Derbin,I. S. Drachnev,A. S. Kayunov,V. N. Muratova
Physics , 2012, DOI: 10.1134/S002136401207003X
Abstract: The axio-electric effect in silicon atoms is sought for solar axions appearing owing to bremsstrahlung and the Compton process. Axions are detected using a Si(Li) detector placed in a low-background setup. As a result, a model-independent constraint on the axion-electron coupling constant $|g_{Ae}| \leq 2.2\times 10^{-10}$ has been obtained, which leads to the bounds $m_{A}\leq$ 7.9 eV and $m_{A}\leq$ 1.4 keV for the mass of the axion in the DFSZ and KSVZ models, respectively (90% C.L.).
Search for Resonant Absorption of Solar Axions Emitted in M1 Transition in $^{57}$Fe Nuclei
A. V. Derbin,A. I. Egorov,I. A. Mitropol'sky,V. N. Muratova,D. A. Semenov,E. V. Unzhakov
Physics , 2009, DOI: 10.1140/epjc/s10052-009-1095-y
Abstract: A search for resonant absorbtion of 14.4 keV solar axions by $^{57}$Fe target was performed. The Si(Li) detector placed inside the low-background setup was used to detect the $\gamma$-quanta appearing in the deexcitation of 14.4 keV nuclear level: $A+\rm{^{57}Fe} \to \rm{^{57}Fe^{*}} \to \rm{^{57}Fe} + \gamma$. The new upper limit for the hadronic axion mass have been obtained: $m_{A} \leq 151$ eV (90% C.L.) ($S$=0.5, $z$=0.56).
Search for solar axions produced by Compton process and bremsstrahlung using the resonant absorption and axioelectric effect
A. V. Derbin,I. S. Dratchnev,A. S. Kayunov,V. N. Muratova,D. A. Semenov,E. V. Unzhakov
Physics , 2013,
Abstract: The search for resonant absorption of Compton and bremsstrahlung solar axions by $^{169}$Tm nuclei have been performed. Such an absorption should lead to the excitation of low-lying nuclear energy level: $A+^{169}$Tm $\rightarrow ^{169}$Tm$^*$ $\rightarrow ^{169}$Tm $+ \gamma$ (8.41 keV). Additionally the axio-electric effect in silicon atoms is sought. The axions are detected using a Si(Li) detectors placed in a low-background setup. As a result, a new model independent restrictions on the axion-electron and the axion-nucleon coupling: $g_{Ae}\times|g^0_{AN}+ g^3_{AN}|\leq 2.1\times10^{-14}$ and the axion-electron coupling constant: $|g_{Ae}| \leq 2.2\times 10^{-10}$ has been obtained. The limits leads to the bounds $m_{A}\leq$ 7.9 eV and $m_{A}\leq$ 1.3 keV for the mass of the axion in the DFSZ and KSVZ models, respectively ($90\%$ C.L.).
Search for Solar Axions Produced by Primakoff Conversion Using Resonant Absorption by $^{169}$Tm Nuclei
A. V. Derbin,S. V. Bakhlanov,A. I. Egorov,I. A. Mitropolsky,V. N. Muratova,D. A. Semenov,E. V. Unzhakov
Physics , 2009, DOI: 10.1016/j.physletb.2009.06.016
Abstract: The search for resonant absorption of the Primakoff solar axions by $^{169}$Tm nuclei have been performed. Such an absorption should lead to the excitation of low-lying nuclear energy level: $A+^{169}$Tm $\to ^{169}$Tm$^*$ $\to ^{169}$Tm$ + \gamma$ (8.41 keV). The Si(Li) detector and $^{169}$Tm target placed inside the low-background setup were used for that purpose. As a result, a new restriction on the axion-photon coupling and axion mass was obtained: $g_{A\gamma}({GeV}^{-1})\cdot m_A(eV)\leq1.36\cdot10^{-5}$ (90% c.l.). In model of hadronic axion this restriction corresponds to the upper limit on axion mass - $m_A\leq$ 191 eV for 90% c.l.
Comment on the statistical analysis in "A new experimental limit for the stability of the electron" by H.V. Klapdor-Kleingrothaus, I.V. Krivosheina and I.V. Titkova
A. Derbin,A. Ianni,O. Smirnov
Physics , 2007,
Abstract: We point out the evident errors in statistical analysis of the data, performed by Klapdor-Kleingrothaus et al in recently published paper to establish a limit on the stability of electron with respect to the decay into $\nu+\gamma$. We performed the reestimation of the sensitivity of the experimental setups to the 256 keV gamma emitted in the hypothetical electron decay, and show that in [1] the limits on the electron stability and charge nonconservation parameter $\epsilon_{e\nu\gamma}^{2}$ are overestimated by at least a factor of 5. We have revealed evident errors in the statistical analysis, performed by Klapdor-Kleingrothaus et al in a recently published paper [1] to establish a limit on the stability of electron with respect to the decay into $\nu+\gamma$. The performed reestimation of the sensitivity of the experimental setups to the 256 keV gamma emitted in the hypothetical electron decay, has shown that the limits on the electron stability and charge nonconservation parameter $\epsilon_{e\nu\gamma}^{2}$ presented in [1], have been overestimated by at least a factor of 5.
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