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In order to study 4-body atomic collisions such as excitation-ionization,transfer with target excitation, and double electron capture, the calculationof a nine-dimensional numerical integral is often required. This calculationcan become computationally expensive, especially when calculating fullydifferential cross sections (FDCS), where the positions and momenta of all theparticles are known. We have developed a new technique for calculating FDCSusing fewer computing hours, but more memory. This new technique allows formuch more efficient calculations and the use of many fewer resources.

Improved Numerical Method for Calculation of 4-Body Transition Amplitudes