Mobility and lifetime of Tl-208 ions in liquid xenon

摘要

Positively charged Tl-208 ions are transported through liquid xenon using electric fields in the range of 4-10 kV cm(-1) and for drift distances up to 50 mm. From these measurements we deduce upper limits on the attenuation length for Tl ions in liquid xenon, resulting in a lifetime >5.5 s. In addition to these results, the field independent mobility of Tl bearing species in liquid xenon was measured to be 1.33 +/- 0.04 x 10(-4) cm(2) V-1 s(-1). This result, when coupled with those for other species by previous workers, suggests that positive ion mobility in liquid xenon is proportional to the hard-core radius. Applications to Ba ion collection in a double beta decay experiment are also discussed. [References: 34]