Positron Annihilation in Pure and Hydrogenated Palladium Deformed by Uniaxial Tension

W. Rudzińska, J. Pająk, Cz. Szymański, R. Szatanik
2001 Acta Physica Polonica. A  
ud zi ¥ sk a , J . P a j¨k, Cz. Szy ma ¥sk i an d R. Szat ani k Instit ut e of Physi cs, O pole U ni versity , O leska 48, 45-052 Opole, Polan d A ngular distri buti ons of the positron annihil ati on quanta were measured for pure and hydrogenated palladi um samples def ormed by unia xi al tension up to di˜erent def ormation degrees. T he relative di˜erence curves, and the v alues of the R parameter characteri zing the dimensions of def ects trapping the positrons, w ere determined. It w as
more » ... d that for relative elongation s ranging from 1.9 to 3.5%, in both the pure and hydrogenated pallad iu m, the p ositrons are trapp ed in def ects larger than vacancy clusters. T he values of the R parameter for pure palladi um samples elongated up to 0.39, 0.77, and 1.5% indicate a dominant role of smaller def ects, like the vacancy clusters. PAC S numb ers: 78. 70. Bj
doi:10.12693/aphyspola.99.479 fatcat:fnvmieerjneglf4lkf3jkqk5na