# Indiana University

 dc.contributor.author Ito, T.M. en dc.contributor.author Clayton, S.M. en dc.contributor.author Ramsey, J. en dc.contributor.author Karcz, M. en dc.contributor.author Liu, C.-Y. en dc.contributor.author Long, J.C. en dc.contributor.author Reddy, T.G. en dc.contributor.author Seidel, G.M. en dc.date.accessioned 2014-08-06T17:11:19Z en dc.date.available 2014-08-06T17:11:19Z en dc.date.issued 2012 en dc.identifier.citation Ito, T. M., Clayton, S. M., Ramsey, J., Karcz, M., Liu, C. -., Long, J. C., . . . Seidel, G. M. (2012). Effect of an electric field on superfluid helium scintillation produced by $\alpha$-particle sources. Physical Review A - Atomic, Molecular, and Optical Physics, 85(4), 042718. http://dx.doi.org/10.1103/PhysRevA.85.042718 en dc.identifier.uri http://hdl.handle.net/2022/18544 dc.description.abstract We report a study of the intensity and time dependence of scintillation produced by weak $\alpha$ -particle sources in super fluid helium in the presence of an electric field (0-45 kV/cm) in the temperature range of 0.2 to 1.1 K at the saturated vapor pressure. Both the prompt and the delayed components of the scintillation exhibit a reduction in intensity with the application of an electric field. The reduction in the intensity of the prompt component is well approximated by a linear dependence on the electric-field strength with a reduction of 15% at 45 kV/cm. When analyzed using the Kramers theory of columnar recombination, thiselectricfielddependence leads to the conclusion that roughly 40% of thescintillationresults from species formed from atoms originally promoted to excited states and 60% from excimers created by ionization and subsequent recombination with the charges initially having a cylindrical Gaussian distribution about the $\alpha$ track of 60 nm radius. The intensity of the delayed component of the scintillation has a stronger dependence on the electric field strength and on temperature. The implications of these data on the mechanisms affecting scintillation in liquid helium are discussed. en dc.language.iso en_US en dc.publisher American Physical Society en dc.relation.isversionof https://doi.org/10.1103/PhysRevA.85.042718 en dc.rights © 2012 American Physical Society. en dc.subject Electricfielddependence en dc.subject Electricfieldstrength en dc.subject Excimers en dc.subject Kramers theory en dc.subject Linear dependence en dc.subject Liquidhelium en dc.subject Saturated vapor pressure en dc.subject Temperature range en dc.subject Time dependence en dc.subject Electric fields en dc.subject Elementary particle sources en dc.subject Helium en dc.subject Liquefied gases en dc.subject Superfluid helium en dc.subject Scintillation en dc.title Effect of an electric field on superfluid helium scintillation produced by $\alpha$-particle sources en dc.type Article en
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