LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
M.Sc. DEGREE EXAMINATION – PHYSICS
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FOURTH SEMESTER – APRIL 2008
PH 4804 – NUCLEAR PHYSICS
Date : 16/04/2008 Dept. No. Max. : 100 Marks
Time : 9:00 – 12:00
Section – A
Answer all the questions. 10 x 2 = 20 Marks
- Mention any two methods of determining the nuclear size.
- How does the np and pp scattering cross section compare?
- What are the two major competing forces in the liquid drop model?
- How does binding energy of the odd-odd differ from the even-even nuclei.
- What are the limits on the phase shifts for an elastic scattering and a nuclear reaction process?
- What is the basic assumption of the continuum theory?
- Give the Gamow Teller selection rules for beta decay.
- What are neutron stars?
- Illustrate Baryon number conservation through a nuclear reaction.
- What are Leptons? Give examples.
Section – B
Answer any four questions. 4 x 7.5 = 30 Marks
- Show from the magnetic moment calculation that deuteron is mostly in the singlet state.
- Derive Levy’s formula for determination of atomic masses.
- Write a note on life time, mass and decay modes of pions.
- Explain using the concept of cross sections the compound nucleus theory. What are conclusions of this theoretical model?
- Discuss the quark model of nucleons and mesons.
Section – C
Answer any four questions. 4 x 12.5= 50Marks
- Discuss with necessary theory how the electron scattering experiments lead to the determination of the nuclear size.
- What are the basic assumptions of the liquid drop model? Using this model explain the phenomena of nuclear fission.
- Explain the optical model of analysing various types of nuclear reactions.
- Explain Gamow’s theory of alpha decay.
- Bring out the various quantum numbers of the elementary particles, the classification of elementary particles and the conservation laws.
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