Annihilation of positrons in neutron-irradiated 6H polytype of. cap alpha. -SiC

Journal Article · Tue May 01 04:00:00 EDT 1984 · Sov. Phys. - Solid State (Engl. Transl.); (United States)

OSTI ID:6461156

Brudnyi, V N; Ermatov, S E; Nurmagambetov, S B; Pogrebnyak, A D; Tolebaev, V T

An experimental investigation was made of the 2..gamma.. annihilation of positrons in neutron-irradiated ..cap alpha..-SiC(6H) crystals. An ''anomalous'' behavior of the half-width GAMMA of the angular correlation curve of annihilation ..gamma.. photons was observed: this half-width decreased from 12 +- 0.2 to 10.5 +- 0.2 mrad at low radiation doses (D<1 x 10/sup 17/ cm/sup -2/) and this was followed by a recovery of GAMMA at higher neutron doses, indicating a nonmonotonic accumulation of radiation defects in the course of neutron bombardment of ..cap alpha..-SiC(6H). An analysis of the experimental results was made by resolving the angular correlation curves into their components, one of which was an ultra-narrow peak attributed to the annihilation of Ps atoms localized in disordered regions. Annealing of radiation defects was investigated in the temperature range 20--1300 /sup 0/C.

• Research Organization: Scientific-Research Institute of Nuclear Physics at the S.M. Kirov Polytechnic Institute, Tomsk
• OSTI ID: 6461156
• Journal Information: Sov. Phys. - Solid State (Engl. Transl.); (United States), Journal Name: Sov. Phys. - Solid State (Engl. Transl.); (United States) Vol. 26:5; ISSN SPSSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360206* -- Ceramics
Cermets
&amp; Refractories-- Radiation Effects
ANNEALING
BARYONS
CARBIDES
CARBON COMPOUNDS
DIMENSIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
GAMMA RADIATION
HADRONS
HALF-THICKNESS
HEAT TREATMENTS
HIGH TEMPERATURE
INHIBITION
IONIZING RADIATIONS
MEDIUM TEMPERATURE
NEUTRONS
NUCLEONS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATIONS
SILICON CARBIDES
SILICON COMPOUNDS
THICKNESS
VERY HIGH TEMPERATURE