منابع مشابه
The Scattering of Light from Liquid Helium
A review is given of the scattering of light by superfluid helium. A brief discussion is given first of the theory of Brillouin and Rayleigh scattering from an ordinary simple pure liquid. It is shown how this discussion must be modified in the case of the superfluid phase of purc 4He, and experimental observations of Brillouin scattering from first sound in liquid helium are described. The dis...
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Positron scattering from helium has been historically limited to experiments with energy resolution of 0.5 eV or worse. A new apparatus has been developed that allows the investigation of scattering processes with an energy resolution as good as 30 meV, allowing new experimental insight into positron helium interactions. High resolution measurements of low energy scattering from helium will be ...
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Many experimental methods of surface science employ electrons or photons of considerable incident energy as probe particles. However, insulating surfaces or delicate physisorbed layers may be damaged by these particles and should, therefore, be analyzed with a gentler probe: He atom scattering allows to determine the symmetry of the unit cell and the detection of phase transitions from diffract...
متن کاملExposure of school children to alpha particles
Background: A substantial part of the public’s natural radiation dose is due to the inhalation of radon gas. Most of the exposure occurs indoors where the airborne concentration of radon and its decay products is usually higher than outdoors. Materials and Methods: Radon activity concentration has been measured twice in 50 classrooms in 5 levels (10 each) during summer and winter using solid-st...
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about the zenith with intensity prominences in the zenith-angle range from 5' to 10', near 20', and in the range from 35' to 40'. These. results tend to confirm the predictions of Schremp relative to the existence of a fine structure due to a line or banded nature of the energy spectrum forcosmic rays at infinity. That the finestructure may not arise partly from magnetic effects is not entirely...
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ژورنال
عنوان ژورنال: Physical Review
سال: 1956
ISSN: 0031-899X
DOI: 10.1103/physrev.104.135