3. The meson composition by quarks is a. ud b. ūd c. ud d. ud e. None of the above
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- 12. What is the wavelength of the photons produced in electron-positron pair annihilation?The reaction below describes an antiquark decaying into other particles. The X represents an unknown particle. d → ū + e + X a. What must be the charge of X? b. What must be the baryon number of X? c. What must be the lepton number of X? d. What is particle X?234. The element 1 Pa is unstable and decays by B-emission with a half-life 6.66 hours. State the nuclear reaction
- 3. Calculate the binding energy (in MeV) for ºBe4. It is given that, M(Be)= 9.0121858 u, M, = 1.008665 u, Me = 1.007276 u, Mn = 0.000551 u, and u = 931 MeV.1. Use the semi empirical mass formula to compute: 64 64 i) ii) The mass difference between 29 Cu and 30 Zn. The binding energy of the last neutron in 207Pb.5. How much energy is released in the decay + → µt + v„? 6. How much energy is required to produce a neutron-antineutron pair?
- 13. (a) Apply L-S coupling according to the Nuclear Shell model to explain the occurrence of magic number 28. (b) Draw the sketch of the appropriate energy level diagram before and after the spin-orbit coupling phenomenon. 4. "Everything is radioactive", explain the statement using appropriate examples and the origin of the radioactivity in your own words.16. Which of the following combinations of quarks makes up a neutron? a. Two down (d) quarks and one strange (s) quark. b. Two down (d) quarks and one up (u) quark. c. Two charm (c ) quarks and one strange (s) quark. d. One down (d) quark) and two up (u) quarks.