2.2- particle sorting

Question 1

how are new particles/antiparticles created

Answer 1

though high energy interactions

Question 2

which particle has the acceptance of not decaying into anything

Answer 2

neutrinos / antineutrinos

(V / V^-)

Question 3

name the main classification group of particles

Answer 3

Particles

/ /

Hardons Leptons

/ /

Baryons measons

Question 4

describe hadrons

(3)

Answer 4

• particles made up of quarks and/or antiquarks
• they feel and interact by the strong interaction
• they decay (and interact) by the weak interaction

(string, heavy)

Question 5

describe leptons

(3)

Answer 5

• fundamental particles
• don’t feel the SNF
• interact and decay by the weak interaction

(weak, light)

Question 6

what can all charge particles interact by

Answer 6

the Electromatic force (of repulsion / attraction)

Question 7

what do all baryons decay into and why

Answer 7

protons

• since its the most stable baryon

Question 8

which baryons ‘never’ decay

Answer 8

protons / antiprotons

Question 9

describe baryons

• give examples of these particles

Answer 9

hardons that all directly / indirectly decay into P+ or P-

proton, neutron, sigma

Question 10

describe mesons

• give examples

Answer 10

hadrons that do not include protons as their decay products

K-meson, π-meson

Question 11

what shape are large hardon collider

how do they prevent particles colliding with the container

Answer 11

ring-shaped

fixed magnets around the side, bending the path of the particles

Question 12

hadron colliders

• give the equation used to calc the total rest energy of the products

Answer 12

E₀ of products = total energy before - E_k of products

(E₀+E_k of reactants)

Question 13

convert ;

1eV –> J

1MeV –> J

Answer 13

eV = 1 x (1.6x10^-19) J

1MeV = 1 x (1.6x10^-13) J

Question 14

convert 1 GeV into MeV

Answer 14

1000MeV