The Radiation of the Positrons Channeled between the Planes of a Crystal*
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چکیده
The case of the channeling radiation for electrons was considered in the previous work [Il. Th e use of the electrons for producing and detecting this type of radiation has the advantage that available electron beams have much smaller transverse phase space than thoseof the positrons. In addition, the intensity of radiation of electrons is somewhat larger in comparison to the positrons simply due to the fact that the electron is captured by an attractive ion potential of the crystal and, therefore, it moves in a strong electric field. The positron, on the other hand, is captured by a repulsive potential formed by the two next ion planes. It moves in a rather weak field oscillating around the middle plane. This remotenessfrom ions increases the ratio of the channeling radiation intensity to the bremsstrahlung one making the experiment with the positrons easier to interpret. SO it is worthwhile to fulfill the calculations also for the positrons. Our aim is to find the full average intensity of channeling radiation. This can be done easily for any given potential. This approach does not give the spectra of emitted radiation (but it allows one to find the position of the spectra maximum). The last one can be found only for equivalent harmonic oscillator. The shape of the emitted line can be found in work [Z], where such a shape was calculated for Si in parabolic approximation for potential corrected for unharmonicity. Since all
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Full Average Radiation of Electrons and Positrons Channeled between the Planes of a Crystal
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تاریخ انتشار 1978