Positronium Formation in Nanostructured Metals

被引：3

作者：

Cizek, J. ^{[1
]}

Melikhova, O. ^{[1
]}

Hruska, P. ^{[1
]}

Vlcek, M. ^{[1
]}

Anwand, W. ^{[2
]}

Liedke, M. O. ^{[2
]}

Novotny, M. ^{[3
]}

Bulir, J. ^{[3
]}

机构：

[1] Charles Univ Prague, Fac Math & Phys, V Holesovickach 2, CR-18000 Prague 8, Czech Republic

[2] Helmholtz Zentrum Dresden Rossendorf, Inst Radiat Phys, Bautzner Landstr 400, D-01328 Dresden, Germany

[3] Acad Sci Czech Republ, Inst Phys, Slovance 2, Prague 18221 8, Czech Republic

来源：

ACTA PHYSICA POLONICA A | 2017年 / 132卷 / 05期

关键词：

ANNIHILATION; BEAM;

D O I：

10.12693/APhysPolA.132.1579

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Positronium formation in Au films was studied using a magnetically guided continuous slow positron beam with variable energy. Black Au film with porous morphology was compared with conventional smooth Au film. In the smooth Au film positronium is formed on the film surface only. The black Au film exhibits porous sub-surface region containing micro-cavities interconnected with surface. Positronium is formed on inner surfaces of microcavities in the sub-surface region and travels through interconnected cavities towards the surface. 3-gamma annihilation of ortho-positronium leaves a clear signature in two-dimensional coincidence Doppler broadening spectra. Measures of 3-gamma annihilation contribution calculated from single gamma-ray and coincidence Doppler broadening spectra were calculated and compared.

引用

页码：1579 / 1584

页数：6

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