Abstract

Cross sections for electron capture in collisions of 60- to 120-keV protons with molecular hydrogen, methane (CH4), ethane (C2H6), and propane (C3H8) have been measured. The cross sections were found to scale roughly linearly with the number of carbon atoms, but the increase was not as large as the simple Bragg additivity rule would predict. Cross section ratio of ethane to methane increases with projectile energy, while the cross section ratio of propane to methane is relatively insensitive to the projectile energy.

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