The anti-particle of an electron, having a positive charge instead of the more usual negative charge It is the only anti-particle of significance in the context of nuclear power Pressure Vessel A reactor containment vessel, usually made from thick steel or pre-stressed concrete, capable of withstanding high internal pressure Used in gas-cooled reactors and light water reactors Proton A stable elementary particle with a charge of 1 6 x 10-19 Coulomb and a mass of 1 67 x 10-27 kg (1 atomic mass unit) The proton forms the whole nucleus of hydrogen atoms of mass number 1 and a part of all other nuclides The number of protons in a nucleus of any element is the atomic number (Z) of that element
The antimatter analog of an electron ( +) Positrons have the same mass as electrons but the opposite charge
A particle emitted from some radioactive nuclei that is positively charged but otherwise identical with the electron
The antimatter equivalent of an electron, having the same mass but a positive charge
an atomic particle with the same mass as an electron but with one unit of positive charge
The antiparticle of the electron, it is capable of mutual annihilation with an electron This annihilation produces two low-energy gamma-rays at 511 keV
A subatomic particle which is identical to the electron in atomic mass, theoretical rest mass, and energy, but opposite in sign Compare proton
A particle which has the same weight and charge as an electron but is electrically positive rather than negative The positron's existence was predicted in theory years before it was actually detected It is not stable in matter
a very small piece of matter that has the same mass as an electron but has a positive electrical charge (positive + -tron (as in electron)). Subatomic particle having the same mass as an electron but with an electric charge of +1 (an electron has a charge of -1). It constitutes the antiparticle (see antimatter) of an electron. The existence of the positron was a consequence of the electron theory of P. A. M. Dirac (1928), and the particle was discovered in cosmic rays by Carl D. Anderson (1905-1991) in 1932. Though they are stable in a vacuum, positrons react quickly with the electrons of ordinary matter, producing gamma rays by the process of annihilation. They are emitted in positive beta decay of proton-rich radioactive nuclei and are formed in pair production