GEMMA experiment: three years of the search for the neutrino magnetic moment

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.Comment: 4 pages, 4 figure

The first result of the neutrino magnetic moment measurement in the GEMMA experiment

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.Comment: 9 pages, 10 figures, 2 table

Neutrino scattering on polarized electron target and neutrino magnetic moment

The completed and proposed experiments for the measurement of the neutrino magnetic moment are discussed. To improve the sensitivity of the search for the neutrino magnetic moment we suggest to use a polarized electron target in the processes of neutrino (antineutrino) -- electron scattering. It is shown that in this case the weak interaction term in the total cross section is few times smaller comparing with unpolarized case, but the electromagnetic term does not depend on electron polarization.Comment: 12 pages, 7 figures. Talk given at the XXVIII ITEP Winter School of Physics, Snegiri, Russia, February 22 - March 1, 200

Large-Mass Ultra-Low Noise Germanium Detectors: Performance and Applications in Neutrino and Astroparticle Physics

A new type of radiation detector, a p-type modified electrode germanium diode, is presented. The prototype displays, for the first time, a combination of features (mass, energy threshold and background expectation) required for a measurement of coherent neutrino-nucleus scattering in a nuclear reactor experiment. The device hybridizes the mass and energy resolution of a conventional HPGe coaxial gamma spectrometer with the low electronic noise and threshold of a small x-ray semiconductor detector, also displaying an intrinsic ability to distinguish multiple from single-site particle interactions. The present performance of the prototype and possible further improvements are discussed, as well as other applications for this new type of device in neutrino and astroparticle physics (double-beta decay, neutrino magnetic moment and WIMP searches).Comment: submitted to Phys. Rev.

Probiotic periodontal complex: research of efficiency

The article present the result of the use probiotic complex «ASEPTA PARODONTAL®» containing Lactobacillus plantarum and Lactobacillus brevis. After a month of using the drug, a decrease in the inflammation index by 34.83%, a decrease in the bleeding index by 63.47%, and a decrease in the level of halitosis by 66.23% were revealed. In the biochemical parameters of saliva, a decrease in the level of saliva protein by 70.28%, a decrease in the integral indicator of the total antioxidant activity by 29.57% was revealed.В статье рассмотрена эффективность применения пробиотического комплекса «АСЕПТА PARODONTAL®», содержащего штаммы Lactobacillus plantarum и Lactobacillus brevis. Через месяц использования препарата выявлено снижение индекса воспаления на 34,83%, снижение индекса кровоточивости на 63,47%, снижение уровня галитоза на 66,23%. В биохимических показателях слюны выявлено снижение уровня белка слюны на 70,28%, снижение интегрального показателя общей антиоксидантной активности на 29,57%

Cosmic muon flux at shallow depths underground

We consider the cosmic muon background for the installations located at shallow depths. We suggest a relatively simple formula for the sea-level muon spectrum, which allows calculate dependencies of the vertical muon intensity and integral muon flux density on overburden. Muon flux dependency on the zenith angle at overburden of 10 to 100 meters of standard rock shows that muon angular distribution practically does not change in this interval. We present muon angular distributions for three typical apparatus locations in measurements on the surface and at shallow depths. It is shown that for such installations the active shielding "umbrella" should overlap a zenith angle of \theta ~ 80^o to remove the cosmic muon background.Comment: 9 pages, 6 figures, submitted to Phys.Atom.Nuc

Identification of morphological biosignatures in martian analogue field specimens using in situ planetary instrumentation

We have investigated how morphological biosignatures (i.e., features related to life) might be identified with an array of viable instruments within the framework of robotic planetary surface operations at Mars. This is the first time such an integrated lab-based study has been conducted that incorporates space-qualified instrumentation designed for combined in situ imaging, analysis, and geotechnics (sampling). Specimens were selected on the basis of feature morphology, scale, and analogy to Mars rocks. Two types of morphological criteria were considered: potential signatures of extinct life (fossilized microbial filaments) and of extant life (crypto-chasmoendolithic microorganisms). The materials originated from a variety of topical martian analogue localities on Earth, including impact craters, high-latitude deserts, and hydrothermal deposits. Our in situ payload included a stereo camera, microscope, M&ouml;ssbauer spectrometer, and sampling device (all space-qualified units from Beagle 2), and an array of commercial instruments, including a multi-spectral imager, an X-ray spectrometer (calibrated to the Beagle 2 instrument), a micro-Raman spectrometer, and a bespoke (custom-designed) X-ray diffractometer. All experiments were conducted within the engineering constraints of in situ operations to generate realistic data and address the practical challenges of measurement

Search for extraterrestrial antineutrino sources with the KamLAND detector

We present the results of a search for extraterrestrial electron antineutrinos ($\bar{\nu}_{e}$'s) in the energy range $8.3 MeV < E_{\bar{\nu}_{e}} < 31.8 MeV$ using the KamLAND detector. In an exposure of 4.53 kton-year, we identify 25 candidate events. All of the candidate events can be attributed to background, most importantly neutral current atmospheric neutrino interactions, setting an upper limit on the probability of $^{8}$B solar $\nu_{e}$'s converting into $\bar{\nu}_{e}$'s at $5.3 \times 10^{-5}$ (90% C.L.), if we assume an undistorted $\bar{\nu}_{e}$ shape. This limit corresponds to a solar $\bar{\nu}_{e}$ flux of $93 cm^{-2} s^{-1}$ or an event rate of $1.6 events (kton-year)^{-1}$ above the energy threshold $(E_{\bar{\nu}_{e}} > 8.3 MeV)$. The present data also allows us to set more stringent limits on the diffuse supernova neutrino flux and on the annihilation rates for light dark matter particles.Comment: 22 pages, 6 figure

Calcium-creatinine ratio and the Sulkowitch test with multiple caries in children with multiple caries

The article discusses the relationship of calcium excretion and caries in children 5-9 years of age. A tendency to increase in the calcium-creatinine ratio (0.28±0.09 mmol / mmol in the group with multiple caries; 0.20±0.01 mmol / mmol in the control group at р≥0.05) and the Sulkowitch test (0,90 points in the group with multiple caries; 0.44 points in the control group with p≥0.05). The correlation between the intensity of caries and laboratory parameters was found for groups of children with multiple caries. To increase the evidence of the relationship of calcium excretion rates and caries intensity, it is necessary to accumulate a larger amount of clinical material.В статье рассмотрена взаимосвязь показателей экскреции кальция и наличия кариеса у детей 5-9 лет. Выявлена тенденция повышения показателей кальций-креатининового соотношения (0,28±0,09 ммоль/ммоль в группе с множественным кариесом; 0,20±0,01 ммоль/ммоль в контрольной группе при р≥0,05) и пробы Сулковича (0,90 балла в группе с множественным кариесом; 0,44 балла в контрольной группе при р≥0,05). Корреляционная связь между интенсивностью кариеса и лабораторными показателями выявлена для группы детей с декомпенсированной формой кариеса. Для повышения доказательности взаимосвязи показателей экскреции кальция и интенсивности кариеса необходимо накопление большего объема клинического материала