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.