Positron annihilation angle correlation measurement method

A technology of positron annihilation and measurement method, which is applied in the field of nuclear detection, can solve the problems of large counting loss and low detection accuracy, and achieve the effects of simplifying operation, improving measurement efficiency and avoiding counting loss

Active Publication Date: 2020-08-04
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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[0005] In view of the above analysis, the present invention provides a correlative measurement method for positron ann

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  • Positron annihilation angle correlation measurement method

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[0041] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and together with the embodiments of the present invention are used to explain the principle of the present invention and are not intended to limit the scope of the present invention.

[0042] A specific embodiment of the present invention discloses a correlation measurement method for positron annihilation angle. Such as figure 1 As shown, the method includes the following steps:

[0043] Step 1. Use multiple first strip-shaped detection units of the first fixed detector and multiple second strip-shaped detection units of the second fixed detector to respectively detect electrons and positrons in the sample along the counter-propagating Incident position information of the first gamma photon and the second gamma photon;

[0044] Specifically, when the positron source irra...

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Abstract

The invention, which belongs to a nuclear detection technology, relates to a positron annihilation angle correlation measurement method, thereby solveing the problems of low feasibility, complex operation, low measurement efficiency and poor precision of an existing measurement method. The method comprises the following steps: respectively detecting incident position information of first gamma photons and second gamma photons which are generated by annihilation of electrons and positron in a sample and are propagated along a reverse direction by utilizing a plurality of first strip-shaped detection units of a first fixed detector and a plurality of second strip-shaped detection units of a second fixed detector; acquiring incident position information of the first gamma photons and the second gamma photons within the coincidence time, and obtaining a corresponding annihilation angle according to the incident position information and the position information of the sample; and acquiringa one-dimensional positron annihilation angle correlation spectrum according to the annihilation angle. The method is high in feasibility, the operation is simplified, and the measurement efficiency and measurement precision are improved.

Description

technical field [0001] The invention relates to the technical field of nuclear detection, in particular to a correlation measurement method for positron annihilation angles. Background technique [0002] Positron annihilation angle correlation measurement method is mainly used to measure the Fermi surface in metals and alloys, to study electron momentum distribution or defects in materials, as well as for positron and electron element physics and chemistry, radiation chemistry, polymer physics and Applied research in fields such as biophysics. Positron annihilation parameters mainly include annihilation lifetime and annihilation momentum, and annihilation momentum is related to annihilation angle and annihilation photon energy. Compared with the energy distribution of annihilation photons measured by Doppler broadening spectrum to obtain the information of electron momentum distribution in materials, the annihilation angle distribution obtained by positron annihilation angl...

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Application Information

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IPC IPC(8): G01T1/36
CPCG01T1/362G01T1/366G01T1/361
Inventor 况鹏王宝义于润升曹兴忠刘福雁刘进洋张鹏魏龙
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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