Author/Authors :
?niegocka، نويسنده , , M. and Jasi?ska، نويسنده , , B. and Goworek، نويسنده , , T. and Zaleski، نويسنده , , R.، نويسنده ,
Abstract :
Temperature dependence of ortho-positronium lifetime in some porous materials was investigated. Above the room temperature the extended Tao–Eldrup model works rather well, however at low temperatures one observes in all samples the lifetimes evidently longer than expected.
