Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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Across: 2. Particle which carries away the missing energy and momentum during the nuclear decay process 6. Particle ____________. Used to convert energy into matter 9. One of the quarks which has a positive charge 10. The anti-particle of the electron 11. One of the quarks wwhich has a negative charge 12. During pair annihilation, two of these rays are produced

Down: 1. The anti-particle of the quark 3. This type of particle does not feel the strong force 4. John ________. Ernest Walton's research partner 5. The Hadrons are divided into two groups: MESONS and _______ 7. Force which holds the nucleus together 8. This substance was bombarded with artificially accelerated protons, during the first artificial splitting of a nucleus