PAIR PRODUCTIONKELOMPOK : V ENY SUSANAWATI (100321508109) FANINDA NOVIKA P (100321508117)

Antimatter - a mirror image of matter Transforming All its mass into pure energy, antimatter is the perfect fuelStar Treks faster than light science fiction spaceships use antimatter power, but research projects have also investigated the use of antimatter fuel for real

PAIR PRODUCTIONFormation or materialization of two electron from a pulse of electromagnetic energy travelling through matter (an atomic nucleus) If a high energy gamma passes close enough to heavy nucleus This process is a conversion of energy into matter and then matter back into energy Electrons and positrons are produced in this interaction

This converts matter back into energy Two gamma photons are released with an energy of 0.51 MeV The produced gamma photons may interact with matter through pair production or Compton scatter Pair production is used for positron emission tomography, a nuclear medicine imaging procedure It is also used in radiation therapy

REACTION

PAIR PRODUCTIONAn incoming photon of 1.02 MeV or greater interacts with the nucleus of an atom The incoming photon disappears The transformation of energy results in the formation of two particles Electron/Negatron Possesses negative charge, mass = 0,51 Mev Positron Possesses a positive charge, mass = 0,51 Mev

Energy Expression For Pair Production

hR ! E E ! ( m0 c 2 K ) ( m0 c 2 K ) ! K K 2m0 c 2 The threshold energy is 2m0 c } 1.02 MeV (P ! 0.012 A)2 o

Where; mo = Rest mass of electron/positron E = The rest mass energies of electron and positron c = velocity of light e- = symbol for electron e+ = symbol for positron

"For every one billion particles of antimatter there were one billion of matter. And when the mutual annihilation was complete, one billionth remained and that's our present universe."