Nuclear Physics & Radioactivity

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Across
  1. 1. Deflects least in an electric field
  2. 3. This nuclear force only acts on quarks. Attractive but very short range
  3. 7. A few mm of this will completely absorb beta radiation
  4. 9. All hadrons consist of..
  5. 10. 2/(238×u) - this would estimate the number of ? in 2kg of uranium-238
  6. 13. uud
  7. 14. This nuclear force acts on both quarks and leptons. Responsible for beta decay
  8. 15. the decay cannot be induced / occurs without external influence
  9. 17. Number of quarks in a baryon
  10. 18. absorbs neutrons and can be used to reduce the rate of the chain reaction
  11. 19. There will be ? times fewer nuclei remaining after four half lives
  12. 20. One particle formed when a proton converts to a neutron
  13. 21. Two light nuclei join together to form a heavier but more stable nucleus.
  14. 23. The minimum energy needed to pull a nucleus apart into its separate nucleons
  15. 26. Electrons and neutrinos are examples of..
  16. 29. Used in the alpha particle scattering experiment. ? Leaf
  17. 31. udd
  18. 33. A particle with the same mass, but all other properties have the opposite sign
  19. 34. Two protons and two neutrons. Used in the scattering experiment
  20. 35. cannot predict when / which nucleus will decay next
  21. 37. 1 decay per second
Down
  1. 2. Rate of decay of nuclei
  2. 4. There are four ? forces (interactions) in nature
  3. 5. the difference between the total mass of the individual, separate nucleons and the mass of the nucleus
  4. 6. The form in which energy is released in fission (of the fragments)
  5. 8. A quark has a baryon number of one ?
  6. 10. The sum of the number of protons and neutrons in the nucleus
  7. 11. charge, baryon number, strangeness, charm, bottomness, and topness must be ? in all hadron interactions
  8. 12. The probability that a nucleus will decay per unit time
  9. 16. binding energy = mass defect x ? squared
  10. 22. One particle formed when a neutron converts to a proton
  11. 24. A thin sheet of this will completely absorb alpha radiation
  12. 25. A few cm of this will completely absorb gamma radiation
  13. 27. Slows the neutrons down which increases the chance of a neutron causing fission of a uranium nucleus
  14. 28. the change in mass defect in both both fission and fusion
  15. 30. Finding the age by studying carbon-14
  16. 32. A proton and neutron have a baryon number of ?
  17. 36. Deflects most in an electric field