Positronium Production in Engineered Porous Silica

• DOI: 10.1021/jp410221m
• Publication Date: 2013-11-29T01:11:01Z
• Authors: Rafael Ferragut; Stefano Aghion; Gaia Tosi; Giovanni Consolati; Fiorenza Quasso; Mariangela Longhi; Anne Galarneau; Francesco Di Renzo
• Keywords: Positronium

Positronium (Ps) has been the subject of several experimental and theoretical investigations due to its many scientific applications. In this work high positronium yield was found in engineered porous silica. The studied materials were pellets swollen MCM-41 commercial Davicat 1700, obtained by different compression pressures, with mesopores characterized structural chemical features. measurements performed a variable energy positron beam at room temperature. An estimation Ps mean diffusion length measuring capped samples. A selected sample (0.39 g/cm3) measured also cryogenic temperature (8 K). material both are be independent pore surface samples is very interesting comparison silica as it possesses hydrophobic patches avoid ice formation low Positron lifetime show survival time inside mesoporous (∼110 ns), which promotes mobility during cooling pores favoring lengths up 1 μm for materials. Besides, possible estimate total coming outside implantation energies between positrons release.