Scintillation and charge extraction from the tracks of energetic electrons in superfluid helium-4

Autor:	Guo, W., Dufault, M., Cahn, S. B., Nikkel, J. A., Shin, Y., McKinsey, D. N.
Rok vydání:	2011
Předmět:	Physics - Instrumentation and Detectors Astrophysics - Instrumentation and Methods for Astrophysics Condensed Matter - Other Condensed Matter High Energy Physics - Experiment
Druh dokumentu:	Working Paper
DOI:	10.1088/1748-0221/7/01/P01002
Popis:	An energetic electron passing through liquid helium causes ionization along its track. The ionized electrons quickly recombine with the resulting positive ions, which leads to the production of prompt scintillation light. By applying appropriate electric fields, some of the ionized electrons can be separated from their parent ions. The fraction of the ionized electrons extracted in a given applied field depends on the separation distance between the electrons and the ions. We report the determination of the mean electron-ion separation distance for charge pairs produced along the tracks of beta particles in superfluid helium at 1.5 K by studying the quenching of the scintillation light under applied electric fields. Knowledge of this mean separation parameter will aid in the design of particle detectors that use superfluid helium as a target material. Comment: 10 pages, 8 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1109.5649 Zobrazit plný text záznamu View this record from Arxiv