ISSN:0033-7579    

DOI:10.1080/00337578608227590

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The basic concepts of both classical and quantum mechanical theories of channeling radiation are presented. The theories developed are discussed separately in low, medium and high energy regions.

ISSN:0033-7579    

DOI:10.1080/00337578608227591

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The paper reviews the results obtained from theoretical studies of the above-barrier particle interaction with crystal atoms. It is shown that in the motion of relativistic electrons and positrons in a crystal at a small angle to one of crystallographic axes quantum effects should manifest themselves in scattering; the radiation spectrum of above-barrier electrons has a maximum in the low frequency region and a high radiation intensity at the maximum; and the mean square of the multiple scattering angle in the crystal appreciably exceeds that in amorphous targets.

ISSN:0033-7579    

DOI:10.1080/00337578608227592

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Measurements of electromagnetic radiation have been performed in the range up to 5 MeV for channeled 1038.5 MeV positrons in a diamond crystal, 2 mm thick, along the (001) plane. The intensity spectrum shows small maxima at photon energies of 0.8 and 1.1−1.2 MeV, the positions of which are in agreement with the calculated positions of acoustic, transverse optical and longitudinal branches of diamond lattice vibrations in the case of electromagnetic conversion of positrons on phonons.

ISSN:0033-7579    

DOI:10.1080/00337578608227593

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The present paper reviews the results obtained for the influence of channeling and over-barrier motion on the relativistic electron and positron radiation in the crystal at different frequencies. The predictions of the Born theory of coherent radiation in the crystal are compared with those of the theory of radiation in channeling and over-barrier motion.

ISSN:0033-7579    

DOI:10.1080/00337578608227594

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

High linear polarization of gamma radiation from channeled electrons in diamond is reported.

ISSN:0033-7579    

DOI:10.1080/00337578608227595

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

New results on the experimental investigation of the electron in a diamond crystal, obtained at the Tomsk synchrotron, are presented. The experimental data are systematized in such a way that it allows observation of a transition from axial to planar channeling and the variation of a maximum position in the radiation spectrum at planar channeling with the electron energy change. A comparison of the spectra of the coherent bremsstrahlung radiation and radiation at planar and axial channeling is performed, and the radiation losses in angular cone 1/γ are obtained.

ISSN:0033-7579    

DOI:10.1080/00337578608227596

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

This report presents the results of experimental investigations of the electron γ-radiation characteristics of thick tungsten single crystals (0.29 and 0.64 mm) obtained on the Tomsk synchrotron. A comparison of the coherent bremsstrahlung radiation spectra (CBS) with the calculation was done for the various orientations of a single crystal. The spectral and orientational γ-radiation characteristics under channeling have been obtained. A technique of the crystal targets orientation on internal beam of the synchrotron has been described.

ISSN:0033-7579    

DOI:10.1080/00337578608227597

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The spectra of 1035 MeV positron radiation in diamond were measured in the range of photon energies where the peaks were found resulting from the phonon conversion. The positions of peaks observed in the spectra of positron radiation are shown to agree with predictions of the theory of phonon conversion by relativistic charged particles.

ISSN:0033-7579    

DOI:10.1080/00337578608227598

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Angular distributions of photons produced by 633 and 1200 MeV electrons in a silicon single crystal, 250 μmthick, have been measured at different orientation angles between the electron beam direction and the crystallographic axis ⟨111⟩. It is shown that the angular distribution of low-energy radiation of electrons moving along the ⟨111⟩ axis is narrower than that of high-energy radiation.

ISSN:0033-7579    

DOI:10.1080/00337578608227599

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor