1.5 - how particles interact Flashcards
1) Interaction model of repulsion
2) Interaction model of attraction
- labeled exchange particle
1) Virtual photon emmited
2) boomerang virtual photon exchange particle
Why are the exchange particles known as VIRTUAL particles
they cannot be detected
- detectors would stop the force/interaction occurring and the particles only last to transfer the momentum/charge across
name the possible interaction with its Gaude boson and the particles it affects
SNF - Pion (π+-0) - hadrons
Electrostatic - virtual photon - charged particles
WNF - W+-Boson - all particles
Describe W Bostons in comparison to photons
W Bosons (Photons)
- non- zero rest energy (o rest energy)
- short range (1x10-3 fm) (**infinet range)
- It has diff charges (W+ and W-) (no charge)
Key rules of Feynman diagrams
(5)
p –> n
e- –> v e
x- axies shows time
W +-Boston shows the transfer of charge
arrow lines show particles
What does the x- axis of a Feynman diagram represent
time
Feynman diagram of;
proton-electron attraction
&
e- - e- repulcion
Feynman diagram of;
B- Decay
Feynman diagram of;
B+ decay
Feynman diagram of;
neutron - neutrino reaction
Feynman diagram of;
proton - antineutrino reaction
feynman diagram of
e- - p collision
- describe how this interaction occurs
free high-speed e- collides with a free proton
- proton becomes a neutron and emits a antiVe
Feynman diagram of;
electron capture
When does electron capture occur
(2)
-when a proton turns into a neutron. Whereby the proton-rich nucleus has a slight interaction between the lowest energy e-
OR
- something with high enough energy knocks an e- out its orbit, and the electrostatic repulsion pulls the e- to the nucleus causing an P+ - e- interaction
