45 research outputs found

    Π£ΡΡ‚ΡŒ-ишимская ΠΊΠΎΡΡ‚ΡŒ: минСралогогСохимичСскиС свойства ΠΊΠ°ΠΊ источник палСонтологичСской, палСоантропологичСской ΠΈ палСоэкологичСской ΠΈΠ½Ρ„ΠΎΡ€ΠΌΠ°Ρ†ΠΈΠΈ

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    Ust-Ishim man was the representative of one of the ancestral groups of the Homo sapiens, Neanderthals and Denisovans. The first results of a comprehensive mineralogical and geochemical study of fossil bones using a wide range of physical, chemical and physico-chemical methods: thermal analysis, optical microscopy, scanning electron microscopy, atomic-force microscopy, nitrogen capillary condensation method, X-ray fluorescence analysis, ISP-MS, gas chromatography method, amino acid chromatography analysis’s, X-ray microprobe method, X-ray diffraction method, Raman and infrared spectroscopy, isotope spectrometry are presented in this article. The studied fragment of the skeleton is of higher preservation rate than the common bone detritus of this age and even the fossils of younger Pleistocene animals that allowed determining almost all its primary properties. The unique preservation presumably was provided by the favorable environment and a special way the Ust-Ishim man originally was buried. Results of study of the chemical and mineral composition of the bone fossils allowed a reconstruction of the Ust-Ishim man life history.Π’ΠΏΠ΅Ρ€Π²Ρ‹Π΅ ΠΏΡ€ΠΎΠ²Π΅Π΄Π΅Π½ΠΎ ΠΌΠΈΠ½Π΅Ρ€Π°Π»ΠΎΠ³ΠΎ-гСохимичСскоС исслСдованиС ископаСмой кости с использованиСм ΡˆΠΈΡ€ΠΎΠΊΠΎΠ³ΠΎ комплСкса физичСских, Ρ„ΠΈΠ·ΠΈΠΊΠΎ-химичСских ΠΈ химичСских ΠΌΠ΅Ρ‚ΠΎΠ΄ΠΎΠ²: тСрмичСского Π°Π½Π°Π»ΠΈΠ·Π°, оптичСской, ΡΠΊΠ°Π½ΠΈΡ€ΡƒΡŽΡ‰Π΅ΠΉ элСктронной, ΡΠΊΠ°Π½ΠΈΡ€ΡƒΡŽΡ‰Π΅ΠΉ Π·ΠΎΠ½Π΄ΠΎΠ²ΠΎΠΉ микроскопии, капиллярной кондСнсации Π°Π·ΠΎΡ‚Π°, рСнтгСнфлуорСсцСнтного Π°Π½Π°Π»ΠΈΠ·Π°, ИБП-МБ, Π³Π°Π·ΠΎΠ²ΠΎΠΉ Ρ…Ρ€ΠΎΠΌΠ°Ρ‚ΠΎΠ³Ρ€Π°Ρ„ΠΈΠΈ, Ρ€Π΅Π½Ρ‚Π³Π΅Π½ΠΎΡΠΏΠ΅ΠΊΡ‚Ρ€Π°Π»ΡŒΠ½ΠΎΠ³ΠΎ ΠΌΠΈΠΊΡ€ΠΎΠ·ΠΎΠ½Π΄ΠΎΠ²ΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π°, рСнтгСновской Π΄ΠΈΡ„Ρ€Π°ΠΊΡ†ΠΈΠΈ, инфракрасной ΠΈ КР спСктроскопии, ΠΈΠ·ΠΎΡ‚ΠΎΠΏΠ½ΠΎΠΉ спСктромСтрии. Π˜Π·ΡƒΡ‡Π΅Π½Π½Ρ‹ΠΉ Π½Π°ΠΌΠΈ Ρ„Ρ€Π°Π³ΠΌΠ΅Π½Ρ‚ кости ΡƒΡΡ‚ΡŒΠΈΡˆΠΈΠΌΡΠΊΠΎΠ³ΠΎ Ρ‡Π΅Π»ΠΎΠ²Π΅ΠΊΠ° Π½Π° Ρ„ΠΎΠ½Π΅ костного Π΄Π΅Ρ‚Ρ€ΠΈΡ‚Π° соврСмСнных Π΅ΠΌΡƒ ΠΈ Π΄Π°ΠΆΠ΅ Π·Π½Π°Ρ‡ΠΈΡ‚Π΅Π»ΡŒΠ½ΠΎ Π±ΠΎΠ»Π΅Π΅ ΠΌΠΎΠ»ΠΎΠ΄Ρ‹Ρ… плСйстоцСновых промысловых ΠΆΠΈΠ²ΠΎΡ‚Π½Ρ‹Ρ… характСризуСтся аномально высокой ΡΡ‚Π΅ΠΏΠ΅Π½ΡŒΡŽ сохранности практичСски ΠΏΠΎ всСм своим свойствам. Π€Π΅Π½ΠΎΠΌΠ΅Π½ ΡΡ‚ΠΎΠ»ΡŒ аномальной сохранности ΠΌΠΎΠΆΠ½ΠΎ ΠΎΠ±ΡŠΡΡΠ½ΠΈΡ‚ΡŒ Ρ‚Π΅ΠΌ, Ρ‡Ρ‚ΠΎ ΡƒΡΡ‚ΡŒΠΈΡˆΠΈΠΌΡΠΊΠΈΠΉ Ρ‡Π΅Π»ΠΎΠ²Π΅ΠΊ ΠΏΠ΅Ρ€Π²ΠΎΠ½Π°Ρ‡Π°Π»ΡŒΠ½ΠΎ Π±Ρ‹Π» Π·Π°Ρ…ΠΎΡ€ΠΎΠ½Π΅Π½ Π»ΠΈΠ±ΠΎ Π² особом мСстС, Π»ΠΈΠ±ΠΎ особСнным способом

    Study of the radiative decay Ο•β†’Ξ·Ξ³\phi \to \eta \gamma with CMD-2 detector

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    Using the 1.9pbβˆ’11.9 pb^{-1} of data collected with the CMD-2 detector at VEPP-2M the decay mode Ο•β†’Ξ·Ξ³\phi \to \eta \gamma, Ξ·β†’Ο€+Ο€βˆ’Ο€0\eta \to \pi^+\pi^-\pi^0 has been studied. The obtained branching ratio is B(Ο•β†’Ξ·Ξ³)=(1.18Β±0.03Β±0.06)\phi \to \eta \gamma) = (1.18 \pm 0.03 \pm 0.06) %.Comment: 13 pages, 5 figures, LaTex2e, to be published in Phys. Lett.

    Observation of KS0K_S^0 semileptonic decays with CMD-2 detector

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    The decay KS0β†’Ο€eΞ½K_S^0 \to \pi e \nu has been observed by the CMD-2 detector at the e^+e^- collider VEPP-2M at Novosibirsk. Of 6 million produced KL0KS0K_L^0K_S^0 pairs, 75Β±1375 \pm 13 events of the KS0β†’Ο€eΞ½K_S^0 \to \pi e \nu decay were selected. The corresponding branching ratio is B(KS0β†’Ο€eΞ½)=(7.2Β±1.4)Γ—10βˆ’4B(K_S^0 \to \pi e \nu)=(7.2 \pm 1.4)\times10^{-4}. This result is consistent with the evaluation of B(KS0β†’Ο€eΞ½)B(K_S^0 \to \pi e \nu) from the KL0K_L^0 semileptonic rate and KS0K_S^0 lifetime assuming Ξ”S=Ξ”Q\Delta S=\Delta Q .Comment: 7 pages, 6 figures, LaTex2e. Submitted to Phys.Lett.

    Measurement of omega meson parameters in pi^+pi^-pi^0 decay mode with CMD-2

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    About 11 200 e^+e^- -> omega -> pi^+pi^-pi^0 events selected in the center of mass energy range from 760 to 810 MeV were used for the measurement of the \omega meson parameters. The following results have been obtained: sigma _{0}=(1457 \pm 23 \pm 19)nb, m_{\omega}=(782.71 \pm 0.07 \pm 0.04) MeV/c^{2}, \Gamma_{\omega}=(8.68 \pm 0.23 \pm 0.10) MeV, \Gamma_{e^+e^-}\cdot Br (\omega -> pi^+pi^-pi^0)= (0.528 \pm 0.012 \pm 0.007) \cdot 10^{-3} MeV.Comment: 8 pages, 4 figure

    Cross section of the reaction e+eβˆ’β†’Ο€+Ο€βˆ’Ο€+Ο€βˆ’e^+ e^- \to \pi^+\pi^-\pi^+\pi^- below 1 GeV at CMD-2

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    Using 3.07 pbβˆ’1{pb}^{-1} of data collected in the energy range 0.60-0.97 GeV by CMD-2, about 150 events of the process \epm \to \pch have been selected. The energy dependence of the cross section agrees with the assumption of the a1(1260)Ο€a_1(1260) \pi intermediate state which is dominant above 1 GeV. For the first time \fourpi events are observed at the ρ\rho meson energy. Under the assumption that all these events come from the ρ\rho meson decay, the value of the cross section at the ρ\rho meson peak corresponds to the following decay width: \Gamma(\rho^0 \to \fourpi) = (2.8 \pm 1.4 \pm 0.5) {keV} or to the branching ratio B(\rho^0 \to \fourpi) = (1.8 \pm 0.9 \pm 0.3) \cdot 10 ^{-5}.Comment: 15 pages, 5 figure

    Study of the Process e+eβˆ’β†’KL0KS0e^+e^- \to K^0_L K^0_S in the C.M.Energy Range 1.05-1.38 GeV with CMD-2

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    The process e+eβˆ’β†’KL0KS0e^+e^- \to K^0_L K^0_S has been studied with the CMD-2 detector using about 950 events detected in the center-of-mass energy range from 1.05 to 1.38 GeV. The cross section exceeds the expectation based on the contributions of the rho(770), omega(782) and phi(1020) mesons only.Comment: 12 pages, 3 figures, uses elsart.cls, submitted to Physics Letters

    Measurement of \Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-) and \Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)

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    The products of the electron width of the J/\psi meson and the branching fraction of its decays to the lepton pairs were measured using data from the KEDR experiment at the VEPP-4M electron-positron collider. The results are \Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-)=(0.3323\pm0.0064\pm0.0048) keV, \Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)=(0.3318\pm0.0052\pm0.0063) keV. Their combinations \Gamma_{ee}\times(\Gamma_{ee}+\Gamma_{\mu\mu})/\Gamma=(0.6641\pm0.0082\pm0.0100) keV, \Gamma_{ee}/\Gamma_{\mu\mu}=1.002\pm0.021\pm0.013 can be used to improve theaccuracy of the leptonic and full widths and test leptonic universality. Assuming e\mu universality and using the world average value of the lepton branching fraction, we also determine the leptonic \Gamma_{ll}=5.59\pm0.12 keV and total \Gamma=94.1\pm2.7 keV widths of the J/\psi meson.Comment: 7 pages, 6 figure

    Study of the Process e+ e- --> omega pi0 --> pi0 pi0 gamma in c.m. Energy Range 920--1380 MeV at CMD-2

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    The cross section of the process e+ e- --> omega pi0 --> pi0 pi0 gamma has been measured in the c.m. energy range 920-1380 MeV with the CMD-2 detector. Its energy dependence is well described by the interference of the rho(770) and rho'(1450) mesons decaying to omega pi0. Upper limits for the cross sections of the direct processes e+ e- --> pi0 pi0 gamma, eta pi0 gamma have been set.Comment: Accepted for publication in PL
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