Moderator efficient The most efficient moderators to date are s-Ne,s-Ar, and s-N2.Using a flat Al substrate and choosing a momentum bite Ap/p 4%(FWHM)of the incoming surface muon beam,we measured the following moderation EMo=NeV /NMev Ne eMod =6.6(7)×105 o=4.0(4)×105 Ar =3.2(3)×10-5 Moderator efficient • The most efficient moderators to date are s-Ne, s-Ar, and s-N2. Using a flat Al substrate and choosing a momentum bite Dp/p = 4%(FWHM) of the incoming surface muon beam, we measured the following moderation