Measurement of then=2density operator for hydrogen atoms produced by passing protons through thin carbon targets

Abstract

Measurements of the $n=2\mathrm{}$ density operator and the probability for $n=2\mathrm{}$ production are reported for hydrogen atoms produced by passing 20 to 1000 keV protons through thin carbon targets. Measurements of the dependence of $2p$ production on the number of protons in the incident projectile and on the time this proton cluster spends within the foil are also discussed.