Chaotic scattering and escape times of marginally trapped ultracold neutrons

K. J. Coakley, J. M. Doyle, S. N. Dzhosyuk, L. Yang, P. R. Huffman

Research output: Contribution to journalArticlepeer-review


We compute classical trajectories of Ultracold neutrons (UCNs) in a superconducting loffe-type magnetic trap using a symplectic integration method. We find that the computed escape time for a particular set of initial conditions (momentum and position) does not generally stabilize as the time step parameter is reduced unless the escape time is short (less than approximately 10 s). For energy intervals where more than half of the escape times computed for UCN realizations are numerically well determined, we predict the median escape time as a function of the midpoint of the interval.

Original languageEnglish (US)
Pages (from-to)367-376
Number of pages10
JournalJournal of Research of the National Institute of Standards and Technology
Issue number4
StatePublished - 2005
Externally publishedYes


  • Chaotic scattering
  • Escape time
  • Hamiltonian system
  • Magnetic trap
  • Symplectic integration
  • Ultracold neutrons

ASJC Scopus subject areas

  • Engineering(all)


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