Nuclear and electronic contributions to Coulomb correction for Moliere screening angle
Abstract
The Coulomb correction (difference from the 1st Born approximation) to the Molière screening angle in multiple Coulomb scattering theory is evaluated with the allowance for inelastic contribution. The controversy between dominance of close or remotecollision contributions to Coulomb correction is discussed. For scattering centres represented by a Coulomb potential with a generic (not necessarily spherically symmetric) creening function, the Coulomb correction is proven to be screeningindependent, by virtue of the eikonal phase cancellation in regions distant from the Coulomb singularity. Treating the atom %more selfconsistently, as an assembly of pointlike electrons and the nucleus, and summing the scattering probability over all the final atom states, it is shown that besides the Coulomb correction due to close encounters of the incident charged particle with atomic nuclei, there are similar corrections due to close encounters with atomic electrons (an analog of Bloch correction). For low $Z\neq1$ the latter contribution can reach $\sim 25\%$, but its observation is partly obscured by multiple scattering effects.
 Publication:

arXiv eprints
 Pub Date:
 July 2021
 DOI:
 10.48550/arXiv.2107.11409
 arXiv:
 arXiv:2107.11409
 Bibcode:
 2021arXiv210711409B
 Keywords:

 Physics  Atomic Physics;
 High Energy Physics  Phenomenology;
 Quantum Physics
 EPrint:
 12 pages, 3 figures