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Updated: May 31, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Configuration interaction calculations of cross sections for proton stopping reactions
Robert J Buenker1, Heinz-Peter Liebermann, Mineo Kimura
1Fachbereich C-Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, Wuppertal, Germany. bobwtal@yahoo.de
Purpose:
To illustrate the role of quantum mechanical electronic structure methods in providing accurate predictions of the cross sections for ionization and electron capture processes that occur as a result of proton collisions in the high-eV to low-keV energy region.
Methods:
Calculations are carried out to compute potential curves and non-adiabatic coupling elements for a variety of collision partners employing the ab initio multireference single- and double-excitation configuration interaction (MRD-CI) method. These results are used as input for the electronic-state close-coupling (ESCC) method in order to compute cross sections for various transitions that occur because of collisions.
Results:
Emphasis is placed on proton-molecule collisions that play a key role in various medical applications as well as in astrophysics and nano-scale materials manufacturing. Examples discussed include the Na-He pair of atoms of interest in recent astrophysical observations, proton collisions with various hydrocarbons and also with water and oxygen, and key ionic products such as H(2)O(+) and H(3)O(+) .
Conclusions:
The computed cross sections provide a detailed picture of radiation damage dynamics in Monte Carlo simulations. This information can potentially enhance the efficiency of proton beam focusing and also reduce undesirable side effects on body tissues.
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