Abstract
It was developed a non-destructive method of positron sensing, which allows to determine the distribution of defects in the depth of the material. From the analysis we can conclude that the angular distribution curves of annihilation photons (well as and on the characteristics in experiments on the lifetime, 3γ - angular correlation, Doppler effect) is influenced by three main factors: a) The distribution of defects in the depth of the material, their dimensions as well as parameters of the interaction of positrons with defects. With increasing the concentration of defects the intensity Jγ(a, ξ) varies more; b) Modification of the energy spectrum of slow positrons due to the influence of defects, wherein the spectrum of positrons becomes softer, and the average energy of the positron annihilation is reduced; c) Deformation of the momentum distribution of the electrons in the region of defect. The energy spectrum of electrons is also becomes softer, and the average energy of the electrons (on which positrons annihilate) is less. The experimentally were measured spectra of photons in the zone of annihilation and were calculated the distribution of defects in depth for a number of metals.
| Original language | English |
|---|---|
| Article number | 012040 |
| Journal | IOP Conference Series: Materials Science and Engineering |
| Volume | 110 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 23 Feb 2016 |
| Externally published | Yes |
| Event | 11th International Scientific Conference on Radiation-Thermal Effects and Processes in Inorganic Materials 2015, RTEP 2015 - Tomsk, Russian Federation Duration: 31 Aug 2015 → 10 Sep 2015 |
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ASJC Scopus subject areas
- Materials Science(all)
- Engineering(all)
Cite this
Positron sensing of distribution of defects in depth materials. / Kupchishin, A. I.; Kupchishin, A. I.; Voronova, N. A.; Kirdyashkin, V. I.
In: IOP Conference Series: Materials Science and Engineering, Vol. 110, No. 1, 012040, 23.02.2016.Research output: Contribution to journal › Conference article
}
TY - JOUR
T1 - Positron sensing of distribution of defects in depth materials
AU - Kupchishin, A. I.
AU - Kupchishin, A. I.
AU - Voronova, N. A.
AU - Kirdyashkin, V. I.
PY - 2016/2/23
Y1 - 2016/2/23
N2 - It was developed a non-destructive method of positron sensing, which allows to determine the distribution of defects in the depth of the material. From the analysis we can conclude that the angular distribution curves of annihilation photons (well as and on the characteristics in experiments on the lifetime, 3γ - angular correlation, Doppler effect) is influenced by three main factors: a) The distribution of defects in the depth of the material, their dimensions as well as parameters of the interaction of positrons with defects. With increasing the concentration of defects the intensity Jγ(a, ξ) varies more; b) Modification of the energy spectrum of slow positrons due to the influence of defects, wherein the spectrum of positrons becomes softer, and the average energy of the positron annihilation is reduced; c) Deformation of the momentum distribution of the electrons in the region of defect. The energy spectrum of electrons is also becomes softer, and the average energy of the electrons (on which positrons annihilate) is less. The experimentally were measured spectra of photons in the zone of annihilation and were calculated the distribution of defects in depth for a number of metals.
AB - It was developed a non-destructive method of positron sensing, which allows to determine the distribution of defects in the depth of the material. From the analysis we can conclude that the angular distribution curves of annihilation photons (well as and on the characteristics in experiments on the lifetime, 3γ - angular correlation, Doppler effect) is influenced by three main factors: a) The distribution of defects in the depth of the material, their dimensions as well as parameters of the interaction of positrons with defects. With increasing the concentration of defects the intensity Jγ(a, ξ) varies more; b) Modification of the energy spectrum of slow positrons due to the influence of defects, wherein the spectrum of positrons becomes softer, and the average energy of the positron annihilation is reduced; c) Deformation of the momentum distribution of the electrons in the region of defect. The energy spectrum of electrons is also becomes softer, and the average energy of the electrons (on which positrons annihilate) is less. The experimentally were measured spectra of photons in the zone of annihilation and were calculated the distribution of defects in depth for a number of metals.
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UR - http://www.scopus.com/inward/citedby.url?scp=84971644111&partnerID=8YFLogxK
U2 - 10.1088/1757-899X/110/1/012040
DO - 10.1088/1757-899X/110/1/012040
M3 - Conference article
AN - SCOPUS:84971644111
VL - 110
JO - IOP Conference Series: Materials Science and Engineering
JF - IOP Conference Series: Materials Science and Engineering
SN - 1757-8981
IS - 1
M1 - 012040
ER -