LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – PHYSICS

FG 40

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

1. Mention any two methods of determining the nuclear size.
2. How does the np and pp scattering cross section compare?
3. What are the two major competing forces in the liquid drop model?
4. How does binding energy of the odd-odd differ from the even-even nuclei.
5. What are the limits on the phase shifts for an elastic scattering and a nuclear reaction process?
6. What is the basic assumption of the continuum theory?
7. Give the Gamow Teller selection rules for beta decay.
8. What are neutron stars?
9. Illustrate Baryon number conservation through a nuclear reaction.
10. What are Leptons? Give examples.

 

Section – B

Answer any four questions.                                                       4 x 7.5 = 30 Marks

11. Show from the magnetic moment calculation that deuteron is mostly in the singlet state.
12. Derive Levy’s formula for determination of atomic masses.
13. Write a note on life time, mass and decay modes of pions.
14. Explain using the concept of cross sections the compound nucleus theory. What are conclusions of this theoretical model?
15. Discuss the quark model of nucleons and mesons.

 

Section – C

Answer any four questions.                                                       4 x 12.5= 50Marks

16. Discuss with necessary theory how the electron scattering experiments lead to the determination of the nuclear size.
17. What are the basic assumptions of the liquid drop model? Using this model explain the phenomena of nuclear fission.
18. Explain the optical model of analysing  various types of nuclear reactions.
19. Explain Gamow’s theory of alpha decay.
20. Bring out the various quantum numbers of the elementary particles, the classification of elementary particles and the conservation laws.

 

 

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – PHYSICS

FOURTH SEMESTER – APRIL 2011

PH 4808 – NUCLEAR PHYSICS

 

 

 

Date : 09-04-2011             Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART-A

Answer all questions                                                                                                 (10 x 2 = 20)

1. Define the fissionability parameter. Estimate its value.
2. Write down the Bethe-Weizsaker mass formula and explain the various terms occurring in it.
3. Name the 3 types of exchange forces and also the single force which does not possess the exchange character.
4. Name the various types of central potential available to solve the deuteron problem in nuclear physics.
5. Identify the type of transition either Fermi or Gamow-Teller or both in the following reaction.

n

6. On the basis of nuclear shell model, determine the spin and parity of B¹¹ after writing down the nucleon configuration.
7. Write down the Geiger Nuttal law and explain the various terms in it.
8. What is Gamow factor in alpha decay? What does it depend on?
9. Give the Gell-Mann-Nishijima formula. Explain the various quantities in the formula.
10. What are strange particles? Give examples.

PART B

Answer any four questions                                                                                                   (4×7.5=30)

11. Write a note on the meson theory of nuclear forces.
12. What are the important features of the Levy’s mass formula?
13. Outline the Optical model of nuclear reactions.
14. How are neutron stars formed?
15. Explain the meson octet structure of elementary particles.

 

PART C

Answer any four questions                                                                                                  (4×12.5=50)

16. How are the experimental observations of the deuteron explained using the quantum mechanical theory?
17. Derive the semi-empirical mass formula of Weizacker.
18. Derive the Breit-Wigner single level formula for resonance scattering.
19. Describe the important features of the Fermi’s theory of beta decay.

 

20. (a) The baryon decuplet predicts the Ω^– hyperon. What are its quantum numbers? (6)

(b) Discuss the possible decay modes of Ω- allowed by the conservation laws and show that the weak decay is the only possibility.                                              (6.5)

 

 

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – PHYSICS

FOURTH SEMESTER – APRIL 2012

PH 4808/4804 – NUCLEAR PHYSICS

 

 

Date : 20-04-2012             Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

PART – A

Answer ALL questions:                                                                                                              (10×2=20)

 

1. Calculate the mass number of the nucleus whose radius is 4.4fm.
2. ₂He⁴ nucleus has no magnetic moment. Why?
3. Define and explain Majorana operator.
4. What do you understand by parity violation in β decay?
5. How are thermal neutrons produced?
6. What is a compound nucleus? Give an example:
7. Define β⁺, β^– and orbital electron capture?
8. Write the shell configuration and predict the spin and parity of ₁₃Al²⁷ nuclei on the basis of single particle shell model.
9. What is level width of resonance ?How is it connected with life time of the nucleus?
10. Give the modes of decay of muons.

 

PART – B

Answer any FOUR questions            :                                                                                                 (4×7.5 = 30)

 

11. Explain how the study of electric quadrupole moment of the nucleus gives information about the shape of the nucleus.
12. Give a brief account on meson theory of nuclear forces.
13. Explain the compound nucleus theory of nuclear reaction.
14. Write a short note on neutron stars.
15. Classify elementary particles.

PART – C

Answer any FOUR questions            :                                                                                                  (4×12.5 =50)

 

16. Discuss the theory of n-p scattering at low energies and hence find an expression for the scattering cross section for l=0.
17. a) Give a detailed account of nuclear shell model. Also discuss the merits and drawbacks of the above model.
18. b) Find the total angular momentum and parity for the ground state of ₁₆S³³ nucleus from the shell model .Also find the electric quadrupole moment from collective model.
19. Explain Gamow’s theory of alpha decay. Derive Geiger -Nuttal law.
20. Explain briefly resonance states of compound nucleus and obtain Breit -wigner formula for l=0 state.
21. a) What are Quarks? Give the quark model of i)mesons ii)Protons and antiprotons.
22. b) Write a short note on the weak and strong nuclear forces.

 

 

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