نتایج جستجو برای: neutron detector
تعداد نتایج: 103020 فیلتر نتایج به سال:
Calibration of three scintillators (EJ232Q, BC422Q, and EJ410) in a time-of-flight arrangement using a laser drive-neutron source is presented. The three plastic scintillator detectors were calibrated with gamma insensitive bubble detector spectrometers, which were absolutely calibrated over a wide range of neutron energies ranging from sub-MeV to 20 MeV. A typical set of data obtained simultan...
Three previously unknown high-energy g-ray transitions between 4.2 and 5.4 MeV were identified in the Tz=−1/2 nucleus Fe following the fusion-evaporation reaction SsSi,2a1nd51Fe. These transitions represent decays of core excited states. The g rays were detected in the Ge detector array Gammasphere combined with the neutron detector system Neutron Shell and the charged-particle array Microball....
Solid-state neutron detectors based only on boron-rich semiconductors are of interest for their potential to provide the highest thermal neutron detection efficiencies of any solid-state neutron detectors. A simple physical model, recently shown to generate thermal neutron capture product spectra that agree quantitatively with full-physics GEANT4 simulation, is used to compare the capture produ...
The characteristics of the Solid-state Neutron Detector, under development for neutron-scattering measurements at European Spallation Source, have been simulated with a Geant4-based computer code. code models interations thermal neutrons and ionising radiation in 6Li-doped scintillating glass detector, production scintillation light transport optical, photons through scintillator, en route to p...
Passive gamma and neutron detectors screen for illicit special nuclear material in vehicles crossing borders between countries. This paper illustrates how statistical analysis of archived detector data can help to evaluate special nuclear material detection probabilities and to investigate several issues, including drifting background, background gamma suppression, nuisance alarms arising from ...
Various neutron detectors for spectrometry, environmental dosimetry and personal dosimetry have been developed by our group. For high energy neutron spectrometry, spallation detectors of C and Bi, large plastic and NE-213 scintillators, self TOF detector have been used for neutron production and shielding experiments at several high energy accelerator facilities, ISIS of Rutherford Appleton Lab...
The VERDI time-of-flight spectrometer is dedicated to measurements of fission product yields and of prompt neutron emission data. Pre-neutron fission-fragment masses will be determined by the double time-of-flight (TOF) technique. For this purpose an excellent time resolution is required. The time of flight of the fragments will be measured by electrostatic mirrors located near the target and t...
While cosmic ray muons themselves are relatively easy to veto in underground detectors, their interactions with nuclei create more insidious backgrounds via: (i) the decays of long-lived isotopes produced by muon-induced spallation reactions inside the detector, (ii) spallation reactions initiated by fast muon-induced neutrons entering from outside the detector, and (iii) nuclear recoils initia...
The wide angular-range chopper spectrometer ARCS at the Spallation Neutron Source (SNS) is optimized to provide a high neutron flux at the sample position with a large solid angle of detector coverage. The instrument incorporates modern neutron instrumentation, such as an elliptically focused neutron guide, high speed magnetic bearing choppers, and a massive array of (3)He linear position sensi...
A new position-sensitive neutron detector has been designed and constructed for a protein crystallography station at LANL’s pulsed neutron source. This station will be one of the most advanced instruments at a major neutron user facility for protein crystallography, fiber and membrane diffraction. The detector, based on neutron absorption in He; has a large sensitive area of 3000 cm; angular co...
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