We present a quasiclassical theory of α decay accompanied by bremsstrahlung with a special emphasis on the case of 210Po, with the aim of finding a unified description that incorporates both the radiation during the tunneling through the Coulomb wall and the finite energy Eγ of the radiated photon up to Eγ~Qα | √/η, where Qα is the α-decay Q-value and η is the Sommerfeld parameter. The corrections with respect to previous quasiclassical investigations are found to be substantial, and excellent agreement with a full quantum mechanical treatment is achieved. Furthermore, we find that a dipole-quadrupole interference significantly changes the α-γ angular correlation. We obtain good agreement between our theoretical predictions and experimental results.
U. D. Jentschura et al., "Quasiclassical Description of Bremsstrahlung Accompanying α Decay Including Quadrupole Radiation," Physical Review C - Nuclear Physics, vol. 77, no. 1, pp. 014611-1-014611-7, American Physical Society (APS), Jan 2008.
The definitive version is available at https://doi.org/10.1103/PhysRevC.77.014611
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