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Scintillation
About: Scintillation is a research topic. Over the lifetime, 14022 publications have been published within this topic receiving 187694 citations.
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63 citations
TL;DR: In this paper, a photo-optical technique was used to record directly a 61-cm cross section of a received laser beam and measurements of the index-structure coefficient Cn were made by use of a high-speed thermal technique.
Abstract: Both a pulsed laser and a helium–neon laser have been used to examine the magnitude of scintillation as a function of range and turbulence strength over a near-earth, horizontal path. A photo-optical technique was utilized to record directly a 61-cm cross section of a received laser beam. Photographs of beam cross sections made at ranges of from 200 to 1500 m were used to compute log-irradiance variances. Simultaneous with the optical data, measurements of the index-structure coefficient Cn were made by use of a high-speed thermal technique. The data are used to test the spherical-wave equation that gives the log-amplitude variance as a function of range and Cn. The measurements indicate that the variance increases for ranges up to about 700 m, at which distance saturation occurs, i.e., no further growth of the variance is observed. The data are also compared with the saturation equations of Tatarski and deWolf. In addition, the effect of the transmitter-beam divergence on the magnitude of scintillation is examined. Finally, a modification of the inertial subrange of the Kolmogorov turbulence model is suggested to explain the occurrence of particular optical effects observed during temperature-inversion conditions.
63 citations
TL;DR: In this article, the relative scintillation efficiency for nuclear and electron recoils is 0.22 +/- 0.01 in the recoil energy range 40 keV - 70 keV in liquid xenon scintillator detectors.
Abstract: Results of observations of low energy nuclear and electron recoil events in liquid xenon scintillator detectors are given. The relative scintillation efficiency for nuclear recoils is 0.22 +/- 0.01 in the recoil energy range 40 keV - 70 keV. Under the assumption of a single dominant decay component to the scintillation pulse-shape the log-normal mean parameter T0 of the maximum likelihood estimator of the decay time constant for 6 keV < Eee < 30 keV nuclear recoil events is equal to 21.0 ns +/- 0.5 ns. It is observed that for electron recoils T0 rises slowly with energy, having a value ~ 30 ns at Eee ~ 15 keV. Electron and nuclear recoil pulse-shapes are found to be well fitted by single exponential functions although some evidence is found for a double exponential form for the nuclear recoil pulse-shape.
63 citations
TL;DR: In this paper, the intra-day variable source 0917+624 displays annual changes in its timescale of variability, which is explained in terms of a scintillation model in which changes in the variability timescale are due to changes in relative velocity of the SCI pattern as the Earth orbits the sun.
Abstract: The intra-day variable source 0917+624 displays annual changes in its timescale of variability. This is explained in terms of a scintillation model in which changes in the variability timescale are due to changes in the relative velocity of the scintillation pattern as the Earth orbits the sun. (see also astro-ph/0102050)
63 citations
TL;DR: In this article, a technique for extracting particle direction using the difference in arrival times for Cherenkov and scintillation light was proposed, which could be used to make direction reconstruction a reality in a kiloton-scale detector.
Abstract: Large liquid-scintillator-based detectors have proven to be exceptionally effective for low energy neutrino measurements due to their good energy resolution and scalability to large volumes. The addition of directional information using Cherenkov light and fast timing would enhance the scientific reach of these detectors, especially for searches for neutrino-less double-beta decay. In this paper, we propose a technique for extracting particle direction using the difference in arrival times for Cherenkov and scintillation light, and evaluate several detector advances in timing, photodetector spectral response, and scintillator emission spectra that could be used to make direction reconstruction a reality in a kiloton-scale detector.
63 citations