| SCI 270: On Nuclear Technology Practice Problems |
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__8 gluon (strong)_
h v or gamma
W plus (Weak)
__W minus (Weak)
__Gauge bosons are force carriers for the 4 different types of forces._
__ Represented by wave lines in Feynmann diagrams. _________________________
u u* or d d*
|u* or d* anti quarks|
|muons and |
|muons and |
|Name||Neutron, n||Proton, p||Sigma plus|
|Lumbda||Cascade||sigmas and charm|
|___ They have the same mass but opposite charge and magnetic momentum____|
|__ The total energy becomse more negative ___|
|__The positive energy states are all empty but all the negative energy states are occupied ___|
|___ One of the positive energy state is occupied and one of the negative energy state is empty. This represent a particle-antiparticl pair. ____|
What happens to a positron and an electron when they come together?
|__The combine into a positronium for a very short moment and then annihilate themselves. Their mass and energy are converted into two photons, each with a minimum energy of 0.51 MeV __|
|__ He observed tracks very similar to those of electron, but these tracks curve opposite compared to those of the electrons in the presence of a magnetic field. ___|
|__ Gamma-ray energies must be 1.02 MeV or greater. However, the probability increases as the photon energy increases. Photons with energy greater than 5 MeV loose their energy most likely by pair production than by Compton scattering or by photo electric effect. __|
|__ Force carriers between charges are photons: radio wave, short radio wave, microwave, IR, light, UV, X-ray, gamma rays etc. ___|
|__ The relative strength of strong, electromagnetic, weak, and gravity forces are 1, 0.0073, 1e-10 and 1e-39 respectively. __|
What does this Fynman diagram represent?
|__ This diagram represent two electrons exchanging a photon. Since the states of the electrons change, this represent an inelastic scattering of electrons. __|