Encontrados 2 documentos, a visualizar página 1 de 1
On the defect pattern evolution in sapphire irradiated by swift ions in a broad...
Gordo, P. M.; Liszkay, L.; Kajcsos, Zs.; Havancsák, K.; Skuratov, V. A.; Kögel, G.; Sperr, P.; Egger, W.; Lima, A. P. de; Marques, M. F. FerreiraSapphire samples, irradiated with swift Kr (245 MeV) ions at room temperature in a broad fluence range, were investigated using a continuous and a pulsed positron beam to study the defect structure created by the passage of the ions in depths of a few micrometers. At small doses, monovacancies were identified as dominant defects and positron trapping centres. These monovacancies are assumed to be highly concent...
Positron and positronium annihilation patterns in zeolites and bulk ceramics
Kajcsos, Zs.; Kosanovic', C.; Liszkay, L.; Major, P.; Lohonyai, L.; Zalán, P.; Lázár, K.; Bosnar, S.; Subotic', B.; Bosnar, D.; Havancsák, K.Positron lifetime (LT) measurements have revealed that in porous media the annihilation pattern is probably dominated by a near-saturation level trapping both for the positron and the positronium as well, which masks the contribution from the ldquofree annihilationrdquo, i.e., annihilation from delocalised positrons. In this work we compare positron lifetime spectra of crystalline zeolites with bulk ceramic mat...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||