نتایج جستجو برای: photomultiplier
تعداد نتایج: 1686 فیلتر نتایج به سال:
Recent developments in positron trapping technology have made possible experimentation with dense interacting positronium gases. Along with these capabilities comes a need for suitable measurement techniques, and accordingly we have developed a method to measure positronium lifetimes from a single intense burst of positrons. Our method is based on recording the anode signal from a photomultipli...
The ANTARES (Astronomy with a Neutrino Telescope and Abyss environmental RESearch) Collaboration constructed and deployed the world’s largest operational underwater neutrino telescope, optimised for the detection of Cherenkov light produced by neutrino-induced muons. The detector has an effective area of about 0.1 km and it is a first step towards a kilometric scale detector. The detector consi...
In the standard nanosecond laser photolysis method for kinetic studies, a Q-switched laser generates transient species, and absorption spectrophotometry provides a measure of their concentrations. The sample is placed between the monitoring source (a pulsed xenon arc or a flash lamp) and a monochromator, and a photomultiplier tube (PMT) is used for measuring the intensity of the light leaving t...
The present status of the ANAIS experiment (Annual Modulation with NaI’s) is shown. ANAIS is intended to use more than 100 kg of NaI(Tl) in the Canfranc Underground Laboratory (Spain) searching for seasonal modulation effects in the WIMP signal; in a first stage, a prototype (one single 10.7 kg crystal) has been developed in order to obtain the best conditions regarding the energy threshold and...
We are developing a new photon detector with micro pattern gaseous detectors. A semitransparent CsI photocathode is combined with 10cm×10cm GEM/μPIC for the first prototype which is aimed for the large liquid Xe detectors. Using Ar+C2H6 (10%) gas, we achieved the gas gain of 10 which is enough to detect single photoelectron. We, then, irradiated UV photons from a newly developed solid scintilla...
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Practical limitations associated with the use of small probe volumes with respect to the droplet size that is being measured by the phase-Doppler interferometry technique are discussed. An intensity-validation scheme and corresponding probe volume correction factor have been developed that reject trajectory errors and account for the rejections in calculation of the probe cross-sectional area. ...
A Cherenkov imaging camera was developed and installed in the second telescope of the CANGAROO-III project for observing gamma-rays having energies above 10eV. The camera consists of 427 pixels, arranged in a hexagonal shape at 0.17◦ intervals, each of which is a 3/4-inch diameter photomultiplier with a Winston-cone–shaped light guide. The camera discussed in this paper offers a wider field of ...
A simple neutron counter based on a scintillator strip, a wavelength shifter rod, and a photomultiplier was constructed in order to compare the properties of such a detector to a commercially available He counter. A calculation of the number of photons per absorbed neutron shows that with the bright Li Gd (11BO3)3 scintillator, light levels should be sufficient to perform pulse height discrimin...
Human breath spontaneously emits photons at a rate of approximately 7,00O/liter-s. The emission has a peak in the red part of the spectrum and an ultraviolet contribution. The emission count rate correlates with peroxide concentration in a saturating manner under normal breathing conditions. When trapped in a balloon, the breath luminescence count rate has a halfdecay time of approximately 20 m...
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