what is positron? also there properties?
A positron is the antiparticle of an electron. It has all the properties of an electron except for the polarity of the electrical charge, which is positive. Therefore, a positron can simply be considered an electron having positive unit electrical charge.
The positrons are positively charged (+1e), almost massless particles. Their rest mass equal to 9.109 × 10−31 kg (510.998 keV/c2) (approximately 1/1836 that of the proton).