title: New insights in muon-catalyzed dd fusion by using ortho-para controlled solid deuterium.
abstract: For the first time, we observed the dependence of the ddmu formation rate and the dmu hyperfine-transition rate on the ortho-para state in muon-catalyzed fusion in the solid D2 state, and found that the effect is even opposite to a recent theoretical prediction. We also determined the back-decay rate and the hyperfine-transition rate via scattering in solid state by using the ortho-para dependence. A theory to describe properly our experimental result is called for to understand the nature of muon-catalyzed fusion in the solid state.
authors.affiliation: Department of Physics, School of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8654, Japan. atoyoda@post.kek.jp
authors.forename: Akihisa
authors.initials: A
authors.lastname: Toyoda
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Ishida
authors.forename: Koichiro
authors.initials: K
authors.lastname: Shimomura
authors.forename: Satoshi N
authors.initials: SN
authors.lastname: Nakamura
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Matsuda
authors.forename: Wataru
authors.initials: W
authors.lastname: Higemoto
authors.forename: Teiichiro
authors.initials: T
authors.lastname: Matsuzaki
authors.forename: Kanetada
authors.initials: K
authors.lastname: Nagamine