<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>-Vacancy Sharing in Near-Symmetric Heavy-Ion Collisions

Abstract

Relative production cross sections for beam (${Z}_{1}$) and target (${Z}_{2}$) $K$ vacancies in heavyion collisions are explained for situations where ${Z}_{1}\ensuremath{\simeq}{Z}_{2}$. Electron promotion creates a vacancy in the $2p\ensuremath{\sigma}$ molecular orbital. As the collision partners retreat, the vacancy has a probability $w({v}_{1}, {Z}_{1}, {Z}_{2})&lt;~\frac{1}{2}$ to be transferred to the $1s$ level of the higher-$Z$ collision partner. With a charge-transfer theory of Demkov, a universal form for $w$ is obtained, which is in excellent agreement with all available data for Ni, Br, and I beams over extended target and energy ranges.