Optimisation of the thickness of the moderator for positron annihilation process study in Ar gas

Toshitaka Oka, Yosuke Sano, Yasushi Kino, Tsutomu Sekine

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

To investigate the deceleration and annihilation processes of positron in noble gas, we attempted to optimise the thickness of the positron moderator. The results of the decreasing trend of free positron intensity and ortho-positronium intensity with the thickness, and the annihilation rate suggest that the energy of almost all the positrons passed through the metal foils was much above the positronium formation threshold of 9 eV. Total thickness of 0.1 g cm-2 of the moderator and the Ar gas was required to stop almost all the positron in Ar gas.

Original languageEnglish
Article number156
JournalEuropean Physical Journal D
Volume68
Issue number6
DOIs
Publication statusPublished - 2014 Jun 1

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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