On the reported deviations of the stopping cross section of water vapor from the Bragg additivity rule.
A comparison of recent experimental values of the stopping cross section epsilon of water molecules in the gaseous phase for alpha particles of various kinetic energies E is made with the corresponding Bragg additivity rule values of H2O based on various experimental values of epsilon of gaseous H2 and O2. Some of the Bragg rule values of epsilon of H2O for alpha particles show remarkable (approximately less than 1%) agreement with experimental values even at low E thus suggesting that experimental error may be the main cause of the reported deviations over the last approximately 50 y.
D000512:Alpha Particles; D005740:Gases; D014867:Water
D005740:Gases; D014867:Water