M. Tobiyama

Abstract: We have performed precise measurements of the energy spectrum of bremsstrahlung from a single crystal. The results are compared with the theory of coherent bremsstrahlung and found to be sensitive to the choice of the functional form of the atomic form factor. The Si data agree with the theoretical curve which is obtained with the form factor based on the Hartree-Fock model within a systematic error of 2%. It is pointed out that measurements sensitive to the atomic form factor to the 0.5% level will become feasible for various materials by improvement of the present method.

TL;DR: In this article, a scintillation counter system for detecting the recoil electrons in the triplet photoproduction was proposed and tested by using tagged photons in the energy range between 120 and 400 MeV.

TL;DR: In this article, the crystal orientation dependence of the intensity of hard photons from Si crystal impinged upon by a 1.2 GeV electron beam was measured and the data were mostly consistent with the theory of coherent radiation except in the close vicinity of the crystal axis, where the data has a sharp peak.

TL;DR: In this paper, a new type of polarimeter for gamma-rays of over a hundred MeV was built based on a principle in which the polarization is obtained from the azimuthal angular distribution of recoil electrons in electron-positron pair productions in the Coulomb fields of electrons.