# as level physics unit 1 particle physics part c

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1. hadrons are particles that
feel the strong nuclear force
2. there are three basic types of particle
• bosons
• leptons
3. hadrons are subdivided into two additional groups depending on their quark structure
• baryons
• mesons
4. protons and neutrons are both
baryons
5. the proton is the only stable
baryon
6. all baryons except the proton are
unstable . this means that they decay to become other particles . the particles a baryon ends up as depends on what it started as , but it always includes a proton . Protons are the only stable baryons - they dont decay as far as we known
7. all baryons except protons decay to a
proton
8. the antiparticles of protons and neutrons are
antibaryons . But if you remember from the previous page , antiparticles are annihilated when they meet the corresponding particle - which means you dont find antibaryons in ordinary matter
9. the baryon number is the number of
baryons
10. the proton and neutron have a baryon number
B = +1
11. antibaryons have a baryon number
B = -1
12. other particles that arent baryons are given a baryon number
B = 0
13. when an interaction occurs , the baryon number on either side of the equation is
• the same . you can use this to predict whether an interaction will happen - if the numbers dont match it cant happen
• the total baryon number in any particle interaction never changes
14. do leptons experience the strong nuclear force
no only particles that contain quarks experience the strong nuclear force
15. the weak force applies to
16. all charged particles experience the
electromagnetic force
17. gravitation affects any particle with
mass but is negligible compared to the other forces
18. hadrons and leptons are assigned numbers that must be ....... in particle interactions
conserved
19. the mesons you need to know about are
pions and kaons
20. all mesons are
unstable and have a baryon number of 0 as they arent baryons
21. pions are the
lightest mesons
22. you get .... versions of pions with different electric charges ....
• three
• + , - , 0
23. pions were discovered in
cosmic rays
24. kaon are ... and more .... than pions
• heavier
• unstable
25. you get different kaons
K+ k-
26. mesons interact with baryons via the
the strong force
27. leptons dont feel the
strong nuclear force . they only interact with other particles via the weak interaction
28. electrons are stable and very familiar but there are also two more leptons called the
the muon and the tau that are just like heavy electrons . they each come with their own neutrino
29. neutrino properties
• almost zero mass
• zero electric charge
• only take part in weak interactions
30. learn table
learn table

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 Author: ghoran ID: 238202 Filename: as level physics unit 1 particle physics part c Updated: 2013-10-01 20:38:13 Tags: struggling this Folders: Description: revision Show Answers:

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