Channeling Effect and Improvement of the Efficiency of Charged Particle Registration with Crystal Scintillators
نویسنده
چکیده
Energy of ions (recoil nuclei) channeled along definite directions in crystals is transferred to the lattice electrons mainly. In NaI(Tl)-type scintillators, this leads to increasing the light yield from ∼10% to ∼100% when compared with the yield for electrons of the same energy. Taking into account this effect at processing data of DAMA/NaI experiments in Gran Sasso, which had demonstrated the year modulation of number of signals in a range of 2-6 keV of electron equivalent, reveals that DAMA/NaI results could be caused by ∼6×10 cm s flux of daemons (Dark Electric Matter Objects – presumably Planckian relic particles) falling out from strongly elongated heliocentric orbits with velocities of 30-50 km/s. The flux value and the 2-6 keV signal intensity agree rather well with values emerging from our former estimates and interpretations of ground-level and underground measurements.
منابع مشابه
CFD Simulation of Parameters Affecting Hydrodynamics of Packed Beds: Effects of Particle Shape, Bed Size, and Bed Length
Packed bed reactors have many applications in different industries such as chemical, petrochemical, and refinery industries. In this work, the effects of some parameters such as the shape and size of particles, bed size, and bed length on the hydrodynamics of the packed beds containing three spherical, cylindrical, and cubic particles types are investigated using CFD. The effect of the combinat...
متن کاملStudying and Applying Channeling at Extremely High Bunch Charges
The potentially high plasma densities possible in solids might produce extremely high acceleration gradients. However solid-state plasmas could pose daunting challenges. Crystal channeling has been suggested as a mechanism to ameliorate these problems. A high-density plasma in a crystal lattice could quench the channeling process. There is no experimental or theoretical guidance on channeling f...
متن کاملOptical simulation and experimental measurement of gamma ray energy spectrum of plastic scintillators with different sizes
The application of large plastic scintillators is widely increasing in the different areas of industry, medicine and security due to technical and economic advantages. One of the main disadvantages of these detectors is the unknown position of Compton edge at gamma ray spectrum. In this research, GEANT4/GATE code has been used to simulate the gamma ray spectrum for different volumes of large pl...
متن کاملChanneling in helium ion microscopy: Mapping of crystal orientation
BACKGROUND The unique surface sensitivity and the high resolution that can be achieved with helium ion microscopy make it a competitive technique for modern materials characterization. As in other techniques that make use of a charged particle beam, channeling through the crystal structure of the bulk of the material can occur. RESULTS Here, we demonstrate how this bulk phenomenon affects sec...
متن کاملبررسی اثرشارژ الکتریکی قطرات آب بر راندمان اسکرابر مه پاش در حذف ذرات فلدسپار
Background and aims: One of the modern ways introduced nowadays for increasing the collection efficiency of particulate, is the use of electric charge in wet scrubbers. These systems can be used in places in which scrubbers are suitable for contaminant collection. In fact, this system only increases the collection efficiency, and it is not a new technology for contaminant collection. Method...
متن کامل