Collision Induced Relaxations within the Antiprotonic Helium Hyperfine Structure

Details Collision Induced Relaxations within the Antiprotonic Helium Hyperfine Structure Collision Induced Relaxations within the Antiprotonic Helium Hyperfine Structure

2009-07-07

arxiv.org/abs/0907.1184v1

Physics

Atomic Physics

15 pages, 10 figures

Scientific paper

We report the first measurements of the inelastic spin exchange collision rate between the Hyperfine (HF) levels of antiprotonic helium. We measure the time dependent evolution of the (37, 35) substates to obtain an inelastic collision rate which qualitatively agrees with recent theoretical calculations. We evaluate these results by using the obtained rate as a parameter in a rigorous simulation which we then compare to to previously measured data. We find that our measurement slightly underestimates the collision rate and therefore conclude that the actual value most probably falls within the upper, rather than lower, limit of the error.

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