The Experts below are selected from a list of 246 Experts worldwide ranked by ideXlab platform
Samy Rengasamy - One of the best experts on this subject based on the ideXlab platform.
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Respiratory protection against airborne nanoparticles: a review
Journal of Nanoparticle Research, 2009Co-Authors: Ronald E. Shaffer, Samy RengasamyAbstract:As a precautionary measure, it is often recommended that workers take steps to reduce their exposure to airborne nanoparticles through the use of respiratory protective devices. The purpose of this study was to provide a review and analysis of the research literature and current recommendations on respirators used for protection against nanoparticles. Key research findings were that studies with particles as small as 4 nm have shown that conventional single-fiber filtration theory can be used to describe the filtration performance of respirators and that the most penetrating particle size for respirators equipped with commonly used Electrostatic Filter media is in the range of 30–100 nm. Future research needs include human laboratory and workplace protection factor studies to measure the respirator total inward leakage of nanoparticles. Industrial hygienists and safety professionals should continue to use traditional respirator selection guidance for workers exposed to nanoparticles.
Ernst Otten - One of the best experts on this subject based on the ideXlab platform.
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Searching the absolute neutrino mass in tritium β-decay—interplay between nuclear, atomic and molecular physics
Hyperfine Interactions, 2010Co-Authors: Ernst OttenAbstract:The paper treats recent experiments measuring the endpoint region of tritium β-decay with high resolution, sensitivity and background rejection, using an Electrostatic Filter with adiabatic magnetic collimation. The spectra are analysed with respect to the neutrino mass. These results form the primary source for the present upper limit of the neutrino mass m _ ν
Ronald E. Shaffer - One of the best experts on this subject based on the ideXlab platform.
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Respiratory protection against airborne nanoparticles: a review
Journal of Nanoparticle Research, 2009Co-Authors: Ronald E. Shaffer, Samy RengasamyAbstract:As a precautionary measure, it is often recommended that workers take steps to reduce their exposure to airborne nanoparticles through the use of respiratory protective devices. The purpose of this study was to provide a review and analysis of the research literature and current recommendations on respirators used for protection against nanoparticles. Key research findings were that studies with particles as small as 4 nm have shown that conventional single-fiber filtration theory can be used to describe the filtration performance of respirators and that the most penetrating particle size for respirators equipped with commonly used Electrostatic Filter media is in the range of 30–100 nm. Future research needs include human laboratory and workplace protection factor studies to measure the respirator total inward leakage of nanoparticles. Industrial hygienists and safety professionals should continue to use traditional respirator selection guidance for workers exposed to nanoparticles.
R. Maisonobe - One of the best experts on this subject based on the ideXlab platform.
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Improved determination of the $β$-$\overlineν_e$ angular correlation coefficient $a$ in free neutron decay with the $a$SPECT spectrometer
Physical Review C, 2020Co-Authors: M. Beck, F. Ayala Guardia, M. Borg, J. Kahlenberg, R. Muñoz Horta, C. Schmidt, A. Wunderle, Werner Heil, R. Maisonobe, M. SimsonAbstract:We report on a precise measurement of the electron-antineutrino angular correlation ($a$ coefficient) in free neutron beta-decay from the $a$SPECT experiment. The $a$ coefficient is inferred from the recoil energy spectrum of the protons which are detected in 4$\pi$ by the $a$SPECT spectrometer using magnetic adiabatic collimation with an Electrostatic Filter. Data are presented from a 100 days run at the Institut Laue Langevin in 2013. The sources of systematic errors are considered and included in the final result. We obtain $a = -0.10430(84)$ which is the most precise measurement of the neutron $a$ coefficient to date. From this, the ratio of axial-vector to vector coupling constants is derived giving $|\lambda| = 1.2677(28)$.
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Improved determination of the $\beta$-$\overline{\nu}_e$ angular correlation coefficient $a$ in free neutron decay with the $aSPECT$ spectrometer
Phys.Rev.C, 2020Co-Authors: M. Beck, M. Borg, J. Kahlenberg, Werner Heil, F. Ayala Guardia, S. Baeßler, F. Glück, M. Klopf, G. Konrad, R. MaisonobeAbstract:We report on a precise measurement of the electron-antineutrino angular correlation (a coefficient) in free neutron beta decay from the aSPECT experiment. The a coefficient is inferred from the recoil energy spectrum of the protons which are detected in 4π by the aSPECT spectrometer using magnetic adiabatic collimation with an Electrostatic Filter. Data are presented from a 100-day run at the Institut Laue Langevin in 2013. The sources of systematic errors are considered and included in the final result. We obtain a=−0.10430(84) which is the most precise measurement of the neutron a coefficient to date. From this, the ratio of axial vector to vector coupling constants is derived giving |λ|=1.2677(28).
M. Beck - One of the best experts on this subject based on the ideXlab platform.
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Improved determination of the $β$-$\overlineν_e$ angular correlation coefficient $a$ in free neutron decay with the $a$SPECT spectrometer
Physical Review C, 2020Co-Authors: M. Beck, F. Ayala Guardia, M. Borg, J. Kahlenberg, R. Muñoz Horta, C. Schmidt, A. Wunderle, Werner Heil, R. Maisonobe, M. SimsonAbstract:We report on a precise measurement of the electron-antineutrino angular correlation ($a$ coefficient) in free neutron beta-decay from the $a$SPECT experiment. The $a$ coefficient is inferred from the recoil energy spectrum of the protons which are detected in 4$\pi$ by the $a$SPECT spectrometer using magnetic adiabatic collimation with an Electrostatic Filter. Data are presented from a 100 days run at the Institut Laue Langevin in 2013. The sources of systematic errors are considered and included in the final result. We obtain $a = -0.10430(84)$ which is the most precise measurement of the neutron $a$ coefficient to date. From this, the ratio of axial-vector to vector coupling constants is derived giving $|\lambda| = 1.2677(28)$.
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Improved determination of the $\beta$-$\overline{\nu}_e$ angular correlation coefficient $a$ in free neutron decay with the $aSPECT$ spectrometer
Phys.Rev.C, 2020Co-Authors: M. Beck, M. Borg, J. Kahlenberg, Werner Heil, F. Ayala Guardia, S. Baeßler, F. Glück, M. Klopf, G. Konrad, R. MaisonobeAbstract:We report on a precise measurement of the electron-antineutrino angular correlation (a coefficient) in free neutron beta decay from the aSPECT experiment. The a coefficient is inferred from the recoil energy spectrum of the protons which are detected in 4π by the aSPECT spectrometer using magnetic adiabatic collimation with an Electrostatic Filter. Data are presented from a 100-day run at the Institut Laue Langevin in 2013. The sources of systematic errors are considered and included in the final result. We obtain a=−0.10430(84) which is the most precise measurement of the neutron a coefficient to date. From this, the ratio of axial vector to vector coupling constants is derived giving |λ|=1.2677(28).