Double capture cross sections in p-Ar collisions

作者：Martinez H^*; Alarcon F B; Amaya Tapia A

来源：Physical Review A, 2008, 78(6): 062715.

DOI：10.1103/PhysRevA.78.062715

• nuclear electron capture
• nuclear shell model
• nuclei with mass number 39 to 58
• proton-nucleus reactions

p-Ar collisions are investigated theoretically and experimentally at impact energies in the keV regime. Total cross sections for double electron capture of p on Ar are calculated by an independent-particle method in the impact energy range 3-100 keV. We have measured the absolute differential and total cross sections for double electron capture for 1.0-5.0-keV p-Ar collisions. The absolute differential cross section (DCS) for all the collision energies considered shows a decreasing behavior with increasing angle, exhibiting an overall decrease of three orders of magnitude. The integrated DCS is found to be between the range of 0.7x10(-2) and 4.5x10(-2) A(2), displays an increasing behavior as a function of the incident energy, and merges with previous data at the high-energy side. The theoretical total cross sections reproduce the structures around 5 keV and 15 keV reported by other available measurements. The analysis of the capture into the 1s(1)4s(1) hydrogen-like configuration points in the direction of a common origin for these peaks.

• 出版日期2008-12