Development of a method for measuring the ortho-positronium quenching rate in low vapor-pressure gases

✍ Scribed by K. Wada; F. Saito; T. Hyodo

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 391 KB
• Volume: 267
• Category: Article
• ISSN: 0168-583X
• DOI: 10.1016/j.nimb.2009.03.110

✦ Synopsis

A new measurement and analysis method for determining the ortho-positronium collisional quenching rate for low vapor-pressure gases is developed. It uses hydrophobic silica aerogels as highly efficient positronium formation media and microchambers. The value of the normalized positronium quenching rate, 1 Z eff , for CH 3 Br measured by this method is 0.70 ± 0.04.