Particles Flashcards
Describe the nature of the strong nuclear force
Hold nucleons together
attractive force that is stronger than electrostatic force
Has a short range.
work equally between all nucleons
At small seperations , muct be repulsive
Describe the size of strong nuclear force at different nucleon seperations
0.5 < strong nuclear force is repulsive , prevent nucleus to crush eachother.
05< x < 3 Strong nuclear force becomes attractive, falls towards 0 about 3fm
3 > strong nuclear force falls to 0 , electrostatic repulsive force is much larger
Describe Alpha decay
proton number dec by 2
nucleon number dec by 4
Describe B- emmision
neutron changes into a proton
emit an electron antineutrino
Proton number inc by 1
What did we discover about the neutrinos
Carry away some energy and momentum .
Conserve energy.
Describe Beta + emission
Proton turns into a neutron .
Release a electron neutrino
what is an antiparticle
same mass and same rest energy .
Opposite charge.
What is Annihilation
Particle meets its antipaarticles ,and mass is converted back into energy .
Release photons in opposite directions
How do you find the minimum photon energy in Annihilation
E = hf
What is pair production
Energy is converted into particle and its antiparticle
How do you find the minimum energy for photon in pair production
E = hf x 2
What is the equation of electron capture
p + e- => n + ve
What is the euation of beta plus decay
p –> n + e+ + ve
what is the equation of beta minus decay
n –> p + e- + v-
What are Hadrons
particles that feel the Strong Nuclear Force
Aren’t fundamental particles , made out of quarks
Baryons + Mesons
