Some applications of controlled-energy positron beams in material studies are discussed. In porous organic polysilicates, measurements of 3 gamma annihilation by Doppler broadening (DB) method at the Trento University allowed to trace pore closing and filling by water vapor. In silicon coimplanted by He+ and H+, DB data combined with positron lifetime measurements at the Munchen pulsed positron beam allowed to explain Si blistering. Presently measured samples of W for applications in thermonuclear reactors, irradiated by W+ and electrons, show vast changes of positron lifetimes, indicating complex dynamics of defects.
Toward a European network of positron laboratories
Brusa, Roberto Sennen;
2015-01-01
Abstract
Some applications of controlled-energy positron beams in material studies are discussed. In porous organic polysilicates, measurements of 3 gamma annihilation by Doppler broadening (DB) method at the Trento University allowed to trace pore closing and filling by water vapor. In silicon coimplanted by He+ and H+, DB data combined with positron lifetime measurements at the Munchen pulsed positron beam allowed to explain Si blistering. Presently measured samples of W for applications in thermonuclear reactors, irradiated by W+ and electrons, show vast changes of positron lifetimes, indicating complex dynamics of defects.File in questo prodotto:
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