A low target density of 0.01 LH
density is chosen such that capture
proceeds predominantly from the F=0 hyperfine state of the muonic hydrogen atom.
Thus the initial state is rather precisely defined. This is a unique advantage
of our method, as it eliminates the significant uncertainties due to 
formation and associated ortho-para transitions, which have clouded the interpretation
of earlier experiments. As estimated in our proposal, effects
can be constrained to below 0.3% of 
. A further reduction
of this correction is expected from the improved 
measurement
in experiment E766 at TRIUMF, which has collected data, but, to our knowledge,
has not presented its results yet[19].