Measurement of the orthopositronium confinement energy in mesoporous thin films

被引：81

作者：

Crivelli, Paolo ^{[1
]}

Gendotti, Ulisse ^{[2
]}

Rubbia, Andre ^{[2
]}

Liszkay, Laszlo ^{[3
]}

Perez, Patrice ^{[3
]}

Corbel, Catherine ^{[4
]}

机构：

[1] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio de Janeiro, Brazil

[2] ETHZ, Inst Teilchenphys, CH-8093 Zurich, Switzerland

[3] CEA Saclay, IFRU, F-91191 Gif Sur Yvette, France

[4] Ecole Polytech, LSI, F-91128 Palaiseau, France

来源：

PHYSICAL REVIEW A | 2010年 / 81卷 / 05期

关键词：

POSITRON-ANNIHILATION; PORE-SIZE; LIFETIME; ANTIPROTONS; COLLISIONS; INTERVAL; POROSITY; PHYSICS; BEAM;

D O I：

10.1103/PhysRevA.81.052703

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this paper, we present measurements of the ortho-positronium (ortho-Ps) emission energy in vacuum from mesoporous films using the time-of-flight technique. We show evidence of quantum mechanical confinement in the mesopores that defines the minimal energy of the emitted Ps. Two samples with different effective pore sizes, measured with positron annihilation lifetime spectroscopy, are compared for the data collected in the temperature range 50-400 K. The sample with smaller pore size exhibits a higher minimal energy (73 +/- 5 meV), compared to the sample with bigger pores (48 +/- 5 meV), due to the stronger confinement. The dependence of the emission energy with the temperature of the target is modeled as ortho-Ps being confined in rectangular boxes in thermodynamic equilibrium with the sample. We also measured that the yield of positronium emitted in vacuum is not affected by the temperature of the target.

引用

页数：8

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