Channeling Effect and Improvement of the Efficiency of Charged Particle Registration with Crystal Scintillators

Abstract

The importance is emphasized of taking into account the channeling along the low index crystallographic axes and planes of a part of low-energy (1-10 keV) recoil ions in measurements of their parameters with crystal scintillators of the type of NaI(Tl) etc. Because the nucleus stopping power in channels is low as compared with electronic stopping power, the light yield of the scintillator must be, accordingly, higher in the given case than that for ions having higher energy (tens keV and more), which lose most part of their energy via nuclear collisions outside channels. Hence, in particular, it follows that the DAMA/NaI observations in Gran Sasso of the annual modulation of the signal frequency in a narrow range of scintillations with an amplitude of 2-6 keV electron equivalent may be due to incidence onto the Earth of exceedingly massive particles (of the type of Planckian objects) from elongated Earth-crossing heliocentric orbits at a velocity of 30-50 km/s. In NaI(Tl), these particles create the iodine recoil ions with just the energy of 2-6 keV.

10 pages

References in corpus (4)

• Measurement of the response of heat-and-ionization germanium detectors to nuclear recoils
• Daemons and DAMA: Their Celestial-Mechanics Interrelations
• Study of the spring and autumn daemon-flux maxima at the Baksan Neutrino Observatory
• Observation of the March Maximum in the Daemon Flux from Neos in the Year 2005: New Efforts and New Effects

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