Kerala University 2006 M.Sc Physics FOURTH SEMESTER - Question Paper

FOURTH SEMESTER M.Sc. DEGREE EXAMINATION

MAY/JUNE - 2006

Branch II - PHYSICS

PH 242 - SUBATOMIC PHYSICS

Max. Marks: 75

PART - A

Answer any five questions. Each question carries 3 marks.

I.:, |, a. What is nuclear isomerism?

l,_; / 5*1, * ,b. ,    What are neutrinos? Explain their important properties.

c.    What is Q-value of a nuclear reaction? Illustrate it with a simple

.M-w:    example. .

. d.    What are Schmidt lines? Explain.

e. ^s Explain curie plots in radioactivity.

^fifTi f.    What are prompt and delayed neutrons in fission..

g.    What are quarks? What are the quantum numbers associated with them.

" h.    Explain CPT theorem.

(5 x 3 = 15 Marks)

Answer all questions. Each question carries 15 marks.

What is the importance of neutrino in nuclear beta decay? Describe the

Fermi theory of beta decay.

OR

II. B. What are mirror nuclei? Why is its study important in nuclear physics?

Explain a simple method used tor the determination of nuclear radius of

a pair of mirror nuclei.

(15 Marks)

S tate the important properties of nuclear force. Discuss the stapk

theory of the ground state of deuteron.

OR

Describe in deta,, _{the partlal wave ana},_{ysis f}

_n ,    (15 Marks)

^{3 Sh0rt aCC0unt of nucl}>r fission. Discuss the Bohr-Whealer

theory of nuclear fission.    ' . '

OR Discuss the Su (3) classification of elementary particles. Give an

account of Su (3) colour symmetry.

(15 Marks) (3x15 = 45 Marks)

PART-C

Answer any three questions. Each question carries 5 marks.    |

Calculate the maximum energy of the beta particle in eV emitted when ³H, decays to ³He₂. (Given mass of ³Hj = 3.01605 amu and mass of ³He₂ = 3.01603 amu)    

Estimate the minimum energy for a proton to penetrate the coulomb barrier of a light nucleus.

The nucleus ²si decays to its mirror nucleus *Al by positron emission. Their mass difference is 6 Mev. Calculate their radius.

Assuming shell model of the nucleus find the spin and parity of the

ground state of wV.

Calculate the threshold energy fcr the reaction, i) e+P->n + v_e ii) v_e + P-*e⁺ + n

Check out for the occurrence of the following decay processes and specify the conservation law when allows / forbids their occurrence, i) p->e⁺+ ii) p-*7t⁺+n~    iii) rc->y + y

(3x5 = 15 Marks)

Attachment: kerala-university-2006-m-sc-physics-40179-1.pdf

Earning:   Approval pending.