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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI 600 034
M.Sc.DEGREE EXAMINATION PHYSICS
FOURTHSEMESTER APRIL 2018
16PPH4MC02/PH4811/PH4808 NUCLEAR PHYSICS
Date: 20-04-2018 Dept. No. Max. 100 Marks
Time: 01:00-04:00
PART A
Answer ALL Questions. (10 x 2 20)
1. An α-particle of energy 5 MeV is scattered through 180o by a Uranium nucleus. Calculate the distance between the nucleus and the α-particle.
2. Write a short note on charge independence of nuclear forces.
3. What are magic numbers? How are they correlated with nuclear stability?
4. Calculate the BE and BE/A of 28Ni64 63.927958u. Given Mn 1.008665u and MH 1.007825u.
5. List down types of reactions based on the type of the bombarding particle.
6. Describe continuum, leading to the collapse of sharp resonances in compound nuclei.
7. What are the 3 modes of β decay?
8. Write a note on parity violation in β decay.
9. What are leptons? Name any two leptons and their antiparticles.
10. Verify if charge is conserved in the following reaction: n K+.
PART
Answer any FOUR Questions x 7.5 30)
11. List and explain the various exchange forces associated with nuclear interactions.
12. Bring out the analogies between the nucleus and the liquid drop.
13. Explain the formation of compound nucleus and describe its energy levels with relevant diagrams.
14. Discuss the Fermi and Gamow-Teller selection rules for beta transitions.
15. Discuss the quark model of nucleons and mesons.
16. Derive the Levy's formula for determination of atomic mass.
PART
Answer anyFOUR Questions x 12.5 50)
17. Discuss with necessary theory, how the electron scattering experiments lead to the determination of the nuclear size.
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18. Obtain an expression for nuclear mass using Weizsacker's semi-empirical formula.
19. Write a detailed note on the basic aspects of a nuclear reactor.
20. Explain the Gamow's theory of alpha decay.
21. Elucidate the principle of CPT invariance in elementary particles.
22. Derive the Breit-Wigner single level resonance formula for compound nuclei.