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Studies of the positive muon behavior in solid H2 and D2
Authors:W Higemoto  K Satoh  N Nishida  K Nishiyama  K Nagamine
Institution:(1) Department of Physics, Faculty of Science, Tokyo Institute of Technology, 2‐12‐1 O‐okayama Meguro‐ku, Tokyo 152, Japan;(2) Meson Science Laboratory, Faculty of Science, University of Tokyo, 7‐3‐1 Hongo, Bunkyo‐ku, Tokyo 113, Japan
Abstract:Using a pulsed muon beam, we have investigated the microscopic μ+ behavior in solid H2 and D2 down to 0.6 K by the μ+SR method. From the studies of μ+ spin relaxation phenomena in solid para‐ H2 and ortho‐ D2, we have found that μ+ forms three distinct microscopic states; H2μ+( D2μ+)(20\sim25\%), muonium (15\sim20\%) and μ+(\sim60\%). In H2μ+, the μ+ spin is depolarized in solid para‐ H2 and a local magnetic field Bloc=1\sim2 G is deduced from LF‐μ+SR measurements. The magnitude of Bloc is inconsistent with the magnetic dipolar field (\sim25 G) expected from the magnetic moments of two protons in the H2μ+ molecule and suggests that the H2μ+ molecule might be in the rotationally excited state. From LF‐μ+SR measurements, muonium and μ+ have been found to diffuse in solid o‐ D_2. The diffusion rate of muonium is two order of magnitude larger than that of μ+. This revised version was published online in August 2006 with corrections to the Cover Date.
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