Effect of an electric field on liquid helium scintillation produced by fast electrons

N. S. Phan; V. Cianciolo; S. M. Clayton; S. A. Currie; R. Dipert; T. M. Ito; S. W.T. MacDonald; C. M. O'Shaughnessy; J. C. Ramsey; G. M. Seidel; E. Smith; E. Tang; Z. Tang; W. Yao

doi:10.1103/PhysRevC.102.035503

Effect of an electric field on liquid helium scintillation produced by fast electrons

N. S. Phan, V. Cianciolo, S. M. Clayton, S. A. Currie, R. Dipert, T. M. Ito, S. W.T. MacDonald, C. M. O'Shaughnessy, J. C. Ramsey, G. M. Seidel, E. Smith, E. Tang, Z. Tang, W. Yao

Neutron Symmetries

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Abstract

The dependence on applied electric field (0-40 kV/cm) of the scintillation light produced by fast electrons and α particles stopped in liquid helium in the temperature range of 0.44 K to 3.12 K is reported. For both types of particles, the reduction in the intensity of the scintillation signal due to the applied field exhibits an apparent temperature dependence. Using an approximate solution of the Debye-Smoluchowski equation, we show that the apparent temperature dependence for electrons can be explained by the time required for geminate pairs to recombine relative to the detector signal integration time. This finding indicates that the spatial distribution of secondary electrons with respect to their geminate partners possesses a heavy, non-Gaussian tail at larger separations and has a dependence on the energy of the primary ionization electron. We discuss the potential application of this result to pulse shape analysis for particle detection and discrimination.

Original language	English
Article number	035503
Journal	Physical Review C
Volume	102
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.102.035503
State	Published - Sep 2020

Funding

The authors greatly appreciate the help provided by the following individuals and organizations: E. Bond (LANL, C-NR) for electroplating the electrode with radioactive sources, M. Febbraro (ORNL) for coating the lightguide with TPB, and LANSCE Facility Operations for providing support for the experimental activities. This work was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, through Contract No. 89233218CNA00000 (LANL) under proposal number LANLEEDM, Contract No. DE-AC05-00OR22725 (ORNL), and Contract No. DE-SC0019309 (ASU).

Funders	Funder number
LANLEEDM	DE-AC05-00OR22725
U.S. Department of Energy
Office of Science
Nuclear Physics	89233218CNA00000
Oak Ridge National Laboratory	DE-SC0019309
Los Alamos National Laboratory

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Phan, N. S., Cianciolo, V., Clayton, S. M., Currie, S. A., Dipert, R., Ito, T. M., MacDonald, S. W. T., O'Shaughnessy, C. M., Ramsey, J. C., Seidel, G. M., Smith, E., Tang, E., Tang, Z., & Yao, W. (2020). Effect of an electric field on liquid helium scintillation produced by fast electrons. Physical Review C, 102(3), Article 035503. https://doi.org/10.1103/PhysRevC.102.035503

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abstract = "The dependence on applied electric field (0-40 kV/cm) of the scintillation light produced by fast electrons and α particles stopped in liquid helium in the temperature range of 0.44 K to 3.12 K is reported. For both types of particles, the reduction in the intensity of the scintillation signal due to the applied field exhibits an apparent temperature dependence. Using an approximate solution of the Debye-Smoluchowski equation, we show that the apparent temperature dependence for electrons can be explained by the time required for geminate pairs to recombine relative to the detector signal integration time. This finding indicates that the spatial distribution of secondary electrons with respect to their geminate partners possesses a heavy, non-Gaussian tail at larger separations and has a dependence on the energy of the primary ionization electron. We discuss the potential application of this result to pulse shape analysis for particle detection and discrimination.",

author = "Phan, {N. S.} and V. Cianciolo and Clayton, {S. M.} and Currie, {S. A.} and R. Dipert and Ito, {T. M.} and MacDonald, {S. W.T.} and O'Shaughnessy, {C. M.} and Ramsey, {J. C.} and Seidel, {G. M.} and E. Smith and E. Tang and Z. Tang and W. Yao",

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AU - Phan, N. S.

AU - Cianciolo, V.

AU - Clayton, S. M.

AU - Currie, S. A.

AU - Dipert, R.

AU - Ito, T. M.

AU - MacDonald, S. W.T.

AU - O'Shaughnessy, C. M.

AU - Ramsey, J. C.

AU - Seidel, G. M.

AU - Smith, E.

AU - Tang, E.

AU - Tang, Z.

AU - Yao, W.

PY - 2020/9

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N2 - The dependence on applied electric field (0-40 kV/cm) of the scintillation light produced by fast electrons and α particles stopped in liquid helium in the temperature range of 0.44 K to 3.12 K is reported. For both types of particles, the reduction in the intensity of the scintillation signal due to the applied field exhibits an apparent temperature dependence. Using an approximate solution of the Debye-Smoluchowski equation, we show that the apparent temperature dependence for electrons can be explained by the time required for geminate pairs to recombine relative to the detector signal integration time. This finding indicates that the spatial distribution of secondary electrons with respect to their geminate partners possesses a heavy, non-Gaussian tail at larger separations and has a dependence on the energy of the primary ionization electron. We discuss the potential application of this result to pulse shape analysis for particle detection and discrimination.

AB - The dependence on applied electric field (0-40 kV/cm) of the scintillation light produced by fast electrons and α particles stopped in liquid helium in the temperature range of 0.44 K to 3.12 K is reported. For both types of particles, the reduction in the intensity of the scintillation signal due to the applied field exhibits an apparent temperature dependence. Using an approximate solution of the Debye-Smoluchowski equation, we show that the apparent temperature dependence for electrons can be explained by the time required for geminate pairs to recombine relative to the detector signal integration time. This finding indicates that the spatial distribution of secondary electrons with respect to their geminate partners possesses a heavy, non-Gaussian tail at larger separations and has a dependence on the energy of the primary ionization electron. We discuss the potential application of this result to pulse shape analysis for particle detection and discrimination.

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Effect of an electric field on liquid helium scintillation produced by fast electrons

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