Positronium annihilation in silica aerogel studied by a positron age-momentum correlation technique

WANG Dan-Ni; ZHANG Lan-Zhi; WANG Bao-Yi; YU Run-Sheng; ZHANG Zhi-Ming; LI Dao-Wu; WEI Long

doi:10.1088/1674-1137/33/1/017

Chinese Physics C> 2009, Vol. 33> Issue(1) : 81-84 DOI: 10.1088/1674-1137/33/1/017

Positronium annihilation in silica aerogel studied by a positron age-momentum correlation technique

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Abstract：
A high-performance positron age-momentum correlation (AMOC) spectrometer was newly developed. The counting rate is increased up to 200 cps much larger than the value 20~cps reported by other international groups. And at the same time, the time resolution still keeps at the international level of 220 ps. Furthermore, positronium (Ps) annihilation in silica aerogel was investigated by AMOC, which indicates: (1) Ps annihilation between the grains dominantly undergoes pick-off process and spin conversion from o-Ps to p-Ps; (2) Annealing below 400 ℃ changes the grain surface conditions, i. e. the desorption of hydrogen and the decrease of the defect centers concentration.

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WANG Dan-Ni, ZHANG Lan-Zhi, WANG Bao-Yi, YU Run-Sheng, ZHANG Zhi-Ming, LI Dao-Wu and WEI Long. Positronium annihilation in silica aerogel studied by a positron age-momentum correlation technique[J]. Chinese Physics C, 2009, 33(1): 81-84. doi: 10.1088/1674-1137/33/1/017

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Received: 2008-04-01
Revised: 2008-06-23

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Positronium annihilation in silica aerogel studied by a positron age-momentum correlation technique

Corresponding author: WANG Dan-Ni,

Received Date: 2008-04-01

Accepted Date: 2008-06-23

Available Online: 2009-01-11

Abstract:

A high-performance positron age-momentum correlation (AMOC) spectrometer was newly developed. The counting rate is increased up to 200 cps much larger than the value 20~cps reported by other international groups. And at the same time, the time resolution still keeps at the international level of 220 ps. Furthermore, positronium (Ps) annihilation in silica aerogel was investigated by AMOC, which indicates: (1) Ps annihilation between the grains dominantly undergoes pick-off process and spin conversion from o-Ps to p-Ps; (2) Annealing below 400 ℃ changes the grain surface conditions, i. e. the desorption of hydrogen and the decrease of the defect centers concentration.

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Positronium annihilation in silica aerogel studied by a positron age-momentum correlation technique

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