Measurements of an ortho-para effect in muon-catalyzed fusion in solid deuterium

A. Toyoda, K. Ishida, K. Shimomura, Y. Matsuda, W. Higemoto, S. N. Nakamura, T. Matsuzaki, K. Nagamine

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12 Citations (Scopus)


In order to investigate the dependence of the rate of muon-catalyzed fusion (μCF) on the ortho-para state (in this case, the nuclear spin state) of deuterium molecules, the fusion protons produced in the μCF in solid deuterium with a controlled ortho-para ratio were observed. The measurements were carried out at a temperature of 3.5 K and ratios of ortho deuterium of 66.7% and 99.9%. The ortho-para effect observed in this work was small (the relative difference of fusion proton yield in the converted (ortho 99.9%) case to that in the normal case is -0.100(117)), suggesting evidence against a proposed solid-state effect that is strongly dependent on the ortho-para ratio (also, the rotational state) of deuterium molecules.

Original languageEnglish
Pages (from-to)30-36
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
Publication statusPublished - 2001 Jun 7
Externally publishedYes


  • Muon catalyzed fusion
  • Ortho-para effect
  • Solid hydrogen

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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