Recent Advances in Compton Scattering

Abstract

A review of achievements in the field of Compton spectrometry in the years that elapsed from the last Sagamore meeting (1988) is presented. Some physical problems that have either appeared as new or became clarified are described. Special emphasis is put to the results obtained by means of magnetic Compton scattering.

Doppler Broadening of In-Flight Positron Annihilation Radiation due to Electron Momentum

“…It may also be possible to measure the angular correlation of the annihilation radiation instead of the photon energies. In principal, the momentum resolution would be comparable to Compton and electron scattering techniques [11,12]. The technique presented here could then be combined with positron channeling.…”

“…This gives a momentum resolution of 4.2p 0 (p 0 1 a.u. of momentum), which is significantly larger than other positron annihilation or momentum spectroscopy techniques [2,4,11,12,19]. The true resolution is slightly more complicated because the annihilation line shape is not Gaussian and it is influenced by detector geometry.…”

“…While Doppler broadening due to the electrons was not measured, it was realized that this determined the ultimate resolution when searching for resonant phenomena in annihilation spectra [10]. In principal, the ability to measure this additional Doppler broadening can be developed into a new probe of electron momentum distributions similar to Compton or electron scattering techniques [11,12].…”

Electron momentum density of hexagonal zinc studied by Compton scattering

“…Compton scattering is a well-established method for investigating electronic structures in condensed matter physics [1][2][3]. The spectrum of inelastically scattered monoenergetic photons from electrons in a target is related through the Doppler effect with the electron momentum-density distribution.…”

Investigation of Electronic Structure of Zn1-xMgxMixed Crystals by Compton Spectroscopy Method

“…It is known that the Compton spectroscopy offers a useful method to investigate the electronic structure of a material [7][8][9]. The socalled Compton profile, J(pz ), measured in the experiment is a function given by the integral of the n(p)-electron density in momentum space…”