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Search Results: 1 - 10 of 130422 matches for " V. Brudanin "
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Investigation of double beta decay with the NEMO-3 detector
A. S. Barabash,V. B. Brudanin,the NEMO Collaboration
Physics , 2010, DOI: 10.1134/S1063778811020062
Abstract: The double beta decay experiment NEMO~3 has been taking data since February 2003. The aim of this experiment is to search for neutrinoless ($0\nu\beta\beta$) decay and investigate two neutrino double beta decay in seven different isotopically enriched samples ($^{100}$Mo, $^{82}$Se, $^{48}$Ca, $^{96}$Zr, $^{116}$Cd, $^{130}$Te and $^{150}$Nd). After analysis of the data corresponding to 3.75 y, no evidence for $0\nu\beta\beta$ decay in the $^{100}$Mo and $^{82}$Se samples was found. The half-life limits at the 90% C.L. are $1.1\cdot 10^{24}$ y and $3.6\cdot 10^{23}$ y, respectively. Additionally for $0\nu\beta\beta$ decay the following limits at the 90% C.L. were obtained, $> 1.3 \cdot 10^{22}$ y for $^{48}$Ca, $> 9.2 \cdot 10^{21}$ y for $^{96}$Zr and $> 1.8 \cdot 10^{22}$ y for $^{150}$Nd. The $2\nu\beta\beta$ decay half-life values were precisely measured for all investigated isotopes.
On Prospects for Exploration of Supersymmetry in Double Beta Decay Experiments
V. A. Bednyakov,V. B. Brudanin,S. G. Kovalenko,Ts. D. Vylov
Physics , 1998, DOI: 10.1142/S0217732397000236
Abstract: We analyze constraints on the parameters of the R-parity violating supersymmetry which can be extracted from non-observation of the neutrinoless nuclear double beta decay ($0\nu\beta\beta$) at a given half-life lower bound. Our analysis covers a large class of phenomenologically viable R-parity violating SUSY models. We introduce special characteristics: the SUSY sensitivity of a $\beta\beta$ decaying isotope and the SUSY reach of a $0\nu\beta\beta$ experiment. The former provides a physical criterion for a selection of the most promising isotopes for SUSY searches and the latter gives a measure of success for a $0\nu\beta\beta$ experiment in exploring the R-parity violating SUSY parameter space. On this basis we discuss prospects for exploration of supersymmetry in various $0\nu\beta\beta$ experiments.
The Results of Search for the Neutrino Magnetic Moment in GEMMA Experiment
A. G. Beda,V. B. Brudanin,V. G. Egorov,D. V. Medvedev,V. S. Pogosov,M. V. Shirchenko,A. S. Starostin
Advances in High Energy Physics , 2012, DOI: 10.1155/2012/350150
Abstract: The result of the neutrino magnetic moment measurement at the Kalinin Nuclear Power Plant (KNPP) with GEMMA spectrometer is presented. The antineutrino-electron scattering is investigated. A high-purity germanium detector with a mass of 1.5?kg placed at a distance of 13.9?m from the 3? reactor core is exposed to the antineutrino flux of 1/cm2/s. The recoil electron spectra taken in 18134 and 4487 hours for the reactor ON and OFF periods are compared. The upper limit for the neutrino magnetic moment at 90% C.L. is derived from the data processing. 1. Introduction The Minimally Extended Standard Model (MSM) predicts a very small magnetic moment value for the massive neutrino ( ) that cannot be observed in experiment at present. However, there are a number of theory extensions beyond the MSM where NMM could be at the level of [1–5] for Majorana neutrino. At the same time, it follows from general considerations [6, 7] that the Dirac NMM cannot exceed . Therefore, the observation of NMM value higher than would be an evidence of new physics and indicate undoubtedly [8–10] that neutrino is a Majorana particle. Furthermore, according to [11] new lepton number violating physics responsible for the generation of NMM arises at the scale which is well below the see-saw scale. For example, for and the neutrino mass ?eV, we can find that TeV. It is rather important to make laboratory NMM measurements sensitive enough to reach the ~ region. The Savanna River experiment by Reines’ group can be considered as the beginning of such measurements. Over a period of thirty years, the sensitivity of reactor experiments has been improved by only a factor of three: from [12, 13] to [14, 15]. Similar limits were obtained for solar neutrinos [16, 17], but, due to the MSW effect (as well as matter-enhanced oscillations in the Sun), their flavor composition changes and therefore the solar NMM results could differ from the reactor ones. In this paper, the result of NMM measurement by the collaboration of ITEP (Moscow) and JINR (Dubna) is presented. The measurements are carried out with the GEMMA spectrometer [15, 18, 19] at the 3?GWth reactor of the KNPP. 2. Experimental Approach A laboratory measurement of the NMM is based on its contribution to the scattering. For nonzero NMM, the differential cross-section is [8] a sum of weak interaction cross-section and electromagnetic one : where is the incident neutrino energy, is the electron recoil energy, is a Weinberg parameter, and is a classical electron radius cm2). Figure 1 shows differential cross-sections (2.1) and (2.2) averaged
GEMMA experiment: three years of the search for the neutrino magnetic moment
A. G. Beda,V. B. Brudanin,E. V. Demidova,V. G. Egorov,D. V. Medvedev,M. V. Shirchenko,A. S. Starostin,Ts. Vylov
Physics , 2009, DOI: 10.1134/S1547477110060063
Abstract: The result of the 3-year neutrino magnetic moment measurement at the Kalinin Nuclear Power Plant with the GEMMA spectrometer is presented. Antineutrino-electron scattering is investigated. A high-purity germanium detector of 1.5 kg placed at a distance of 13.9 m from the 3 GW(th) reactor core is used in the spectrometer. The antineutrino flux is 2.7E13 1/scm/s. The differential method is used to extract (nu-e) electromagnetic scattering events. The scattered electron spectra taken in 5184+6798 and 1853+1021 hours for the reactor ON and OFF periods are compared. The upper limit for the neutrino magnetic moment < 3.2E-11 Bohr magneton at 90% CL is derived from the data processing.
Upper limit on the neutrino magnetic moment from three years of data from the GEMMA spectrometer
A. G. Beda,V. B. Brudanin,V. G. Egorov,D. V. Medvedev,V. S. Pogosov,M. V. Shirchenko,A. S. Starostin
Physics , 2010,
Abstract: The result of the 3-year neutrino magnetic moment measurement at the Kalinin Nuclear Power Plant with the GEMMA spectrometer is presented. Antineutrino-electron scattering is investigated. A HPGe detector of 1.5 kg placed at a distance of 13.9 m from the centre of the 3 GW_th reactor core is used in the spectrometer. The antineutrino flux is 2.7x10^13 1/cm^2/s. The differential method is used to extract nu-e electromagnetic scattering events. The scattered electron spectra taken in 5184+6798 and 1853+1021 hours during the reactor ON and OFF periods respectively are compared. The upper limits for the neutrino magnetic moment with and without atomic ionization mechanism were found to be 5.0x10^-12 and 3.2x10^-11 Bohr magnetons at 90% CL, respectively.
The first result of the neutrino magnetic moment measurement in the GEMMA experiment
A. G. Beda,V. B. Brudanin,E. V. Demidova,V. G. Egorov,M. G. Gavrilov,M. V. Shirchenko,A. S. Starostin,Ts. Vylov
Physics , 2007, DOI: 10.1134/S1063778807110063
Abstract: The first result of the neutrino magnetic moment measurement at the Kalininskaya Nuclear Power Plant (KNPP) with the GEMMA spectrometer is presented. An antineutrino-electron scattering is investigated. A high-purity germanium detector of 1.5 kg placed 13.9 m away from the 3 GW reactor core is used in the spectrometer. The antineutrino flux is $2.73\times 10^{13} \nu_e / cm^2 / s$. The differential method is used to extract the $\nu$-e electromagnetic scattering events. The scattered electron spectra taken in 6200 and 2064 hours for the reactor ON and OFF periods are compared. The upper limit for the neutrino magnetic moment $\mu_\nu < 5.8\times 10^{-11}$ Bohr magnetons at 90{%} CL is derived from the data processing.
Registration of reactor neutrinos with the highly segmented plastic scintillator detector DANSSino
V. Belov,V. Brudanin,M. Danilov,V. Egorov,M. Fomina,A. Kobyakin,V. Rusinov,M. Shirchenko,Yu. Shitov,A. Starostin,I. Zhitnikov
Physics , 2013, DOI: 10.1088/1748-0221/8/05/P05018
Abstract: DANSSino is a simplified pilot version of a solid-state detector of reactor antineutrino (it is being created within the DANSS project and will be installed close to an industrial nuclear power reactor). Numerous tests performed under a 3 GW(th) reactor of the Kalinin NPP at a distance of 11 m from the core demonstrate operability of the chosen design and reveal the main sources of the background. In spite of its small size (20x20x100 ccm), the pilot detector turned out to be quite sensitive to reactor neutrinos, detecting about 70 IBD events per day with the signal-to-background ratio about unity.
111Cd- TDPAC study of pressure-induced valence transition in YbAl2
A. V. Tsvyashchenko,L. N. Fomicheva,V. B. Brudanin,O. I. Kochetov,A. V. Salamatin,A. Velichkov,M. Wiertel,M. Budzynski,A. A. Sorokin,G. K. Ryasniy,B. A. Komissarova,M. Milanov
Physics , 2007,
Abstract: The quadrupole interaction at 111Cd impurity nuclei in the intermediate-valence compound YbAl2 has been measured under pressure up to 80 kbar by the TDPAC spectroscopy. It was found that the quadrupole frequency nQ measured on the 111Cd located at the Al sites in YbAl2, varies nonlinearly and increases by almost four times with the pressure increase up to 80 kbar. A linear correlation between the mean Yb valence, derived from Yb L3 OFY-XAS and RXES measurements, and the electric field gradient (the quadrupole frequency nQ=eQVzz/h) has been observed. The quadrupole frequencies on 111Cd in the GdAl2, YbAl3, TmAl3 and CaAl2 compounds have been measured, also. The possibility of determining the valence of Yb in the Yb compounds with p-metals from the relation nQ (u(P)) = n2 + (n3 - n2) u(P) has been considered.
Search for double beta decay processes in 106Cd with the help of 106CdWO4 crystal scintillator
P. Belli,R. Bernabei,R. S. Boiko,V. B. Brudanin,F. Cappella,V. Caracciolo,R. Cerulli,D. M. Chernyak,F. A. Danevich,S. d'Angelo,E. N. Galashov,A. Incicchitti,V. V. Kobychev,M. Laubenstein,V. M. Mokina,D. V. Poda,R. B. Podviyanuk,O. G. Polischuk,V. N. Shlegel,Yu. G. Stenin,J. Suhonen,V. I. Tretyak,Ya. V. Vasiliev
Physics , 2011, DOI: 10.1103/PhysRevC.85.044610
Abstract: A search for the double beta processes in 106Cd was carried out at the Gran Sasso National Laboratories of the INFN (Italy) with the help of a 106CdWO4 crystal scintillator (215 g) enriched in 106Cd up to 66%. After 6590 h of data taking, new improved half-life limits on the double beta processes in 106Cd were established at the level of 10^{19}-10^{21} yr; in particular, T_{1/2}(2\nu \epsilon \beta^+) > 2.1 10^{20} yr, T_{1/2}(2\nu 2\beta^+) > 4.3 10^{20} yr, and T_{1/2}(0\nu 2\epsilon) > 1.0 10^{21} yr. The resonant neutrinoless double electron captures to the 2718 keV, 2741 keV and 2748 keV excited states of 106Pd are restricted to T_{1/2}(0\nu 2K) > 4.3 10^{20} yr, T_{1/2}(0\nu KL1) > 9.5 10^{20} yr and T_{1/2}(0\nu KL3) > 4.3 10^{20} yr, respectively (all limits at 90% C.L.). A possible resonant enhancement of the 0\nu 2\epsilon processes is estimated in the framework of the QRPA approach. The radioactive contamination of the 106CdWO4 crystal scintillator is reported.
Electric field gradients in MgB$_2$ synthesized at high pressure: $^111$Cd TDPAC study and ab initio calculation
A. V. Tsvyashchenko,L. N. Fomicheva,M. V. Magnitskaya,E. N. Shirani,V. B. Brudanin,D. V. Filossofov,O. I. Kochetov,N. A. Lebedev,A. F. Novgorodov,A. V. Salamatin,N. A. Korolev,A. I. Velichkov,V. V. Timkin,A. P. Menushenkov,A. V. Kuznetsov,V. M. Shabanov,Z. Z. Akselrod
Physics , 2001, DOI: 10.1016/S0038-1098(01)00229-0
Abstract: We report the high-pressure synthesis of novel superconductor MgB$_2$ and some related compounds. The superconducting transition temperature of our samples of MgB$_2$ is equal to 36.6 K. The MgB$_2$ lattice parameters determined via X-ray diffraction are in excellent agreement with results of our ab initio calculations. The time-differential perturbed angular correlation (TDPAC) experiments demonstrate a small increase in quadrupole frequency of $^111$Cd probe with decreasing temperature from 293 to 4.2 K. The electric field gradient (EFG) at the B site calculated from first principles is in fair agreement with EFG obtained from $^11$B NMR spectra of MgB$_2$ reported in the literature. It is also very close to EFG found in our $^111$Cd TDPAC measurements, which suggests that the $^111$Cd probe substitutes for boron in the MgB$_2$ lattice.
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