- Tytuł:
- Numerical Solution of a Two-Particle Model of Positronium Confined in Small Cavities
- Autorzy:
-
Tanzi Marlotti, G.
Castelli, F.
Consolati, G. - Powiązania:
- https://bibliotekanauki.pl/articles/1033255.pdf
- Data publikacji:
- 2017-11
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
36.10.Dr
34.80.Lx
78.70.Bj - Opis:
- The positronium atom (Ps) is widely used as a probe to characterize nanoporous and mesoporous materials. Existing theoretical models for describing Ps annihilation rates by pick-off processes generally treat Ps as a point particle confined in a potential well. Hence these models do not justify any change in the internal structure of Ps, which is experimentally accessible by means of the contact density parameter. Recently we formulated a two-particle model in which only the electron is confined in the cavity, while the positron is moving freely and feels the medium via a positive work function. We present here a numerical treatment of the problem of calculating contact densities and pick-off annihilation rates, by using a variational method. Results are in agreement with experimental data for a large class of materials, and suggest a way to connect these data with pore sizes and positron work functions.
- Źródło:
-
Acta Physica Polonica A; 2017, 132, 5; 1575-1578
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł