Bremsstrahlung in alpha-decay: angular analysis of spectra
  A quantum mechanical method of calculation of bremsstrahlung spectra in alpha-decay of heavy nuclei with taking into account an angle between directions of the alpha-particle motion and the photon emission is presented. Dependence between the bremsstrahlung spectrum and the angle value is obtained in a simple analytical form. The method can be used for a comparative analysis of experimental data, obtained at different angles. 
Sergei P. Maydanyuk, Sergei V. Belchikov (Institute for Nuclear   Research, Kiev, Ukraine)