N A L A N D A O P E N U N I V E R S I T Y
M.Sc. Physics, Part-I
PAPER-V
(Nuclear and Particle Physics)
Annual Examination, 2017
Time 3 Hours. Full Marks 80
Answer any Five Questions.
All questions carry equal marks.
1. Give an account of the nature of force existing between a proton and a neutron in a deuteron
for the ground state.
2. Discuss neutron-proton scattering at low energies. What light does it throw on the nature of
nuclear force
3. Show that the nuclear force is spin dependent. Justify your answer with substantive
experimental facts.
4. Describe the basic ideas of Yukawa's meson exchange theory of the nuclear forces. Give the
properties of -meson.
5. Define total and differential cross section. Describe experimental determination of cross section.
6. Describe the compound nucleus theory of nuclear reactions. Give experimental evidences in
support of this theory.
7. Give the simple Briet-Wigner one level formula for the cross-section of neutron reaction in
nuclei. Explain how the width of the resonance level can be obtained from this formula.
8. What are stripping and pick-up reactions Obtain an expression for the reaction amplitude
using Butler theory for stripping and pick-up reactions.
9. Give a brief account of Fermi's theory of -decay and show how it was necessary to postulate
the existence of neutrino.
10. Describe Wu's experiment and give its interpretation to explain the non-conservation of party
in weak interaction.