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Pune University - Sem - IV : Nuclear Physics, April 2010 (Old Course)

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Total No. of Questions : 7] P879 [Total No. of Pages : 2 [3722]-41 M. Sc. PHYSICS PHY UT - 801 : Nuclear Physics (Old Course) (2005 Pattern) (Sem. - IV) Time : 3 Hours] [Max. Marks : 80 Instructions to the candidates : 1) Question No. 1 is compulsory. Attempt any four questions from the remaining. 2) Draw neat diagrams wherever necessary. 3) Figures to the right indicate full marks. 4) Use of logarithmic tables and pocket calculator is allowed. Q1) Attempt any four of the following : a) What is distance of closest approach of a 2 MeV proton to a gold nucleus? How does this distance compare with for a deuteron and particle of the same energy? (Given : Z = 79, z = 1, e = 1.6 10 b) 19 C, 4 0 = 1 ) 9 10 +9 [4] Calculate the total cross-section for n-p scattering at neutron energy 2 MeV (lab). (Given : at = 5.38 F, as = 23.7 F, rot = 1.70 F and ros = 2.40 F, ! 34 = 1.054 10 Js, M = 1.6748 10 27 kg). [4] c) Calculate total angular momentum I, magnetic moment and Quadropole moment Q, also state parity of 8O17 using shell model. [4] d) State the assumptions of Fermi theory of Beta decay. [4] e) Explain pair production in case of absorption of Gamma Rays. [4] f) Which of the following reactions are allowed or forbidden under the conservation of strongess, conservation of baryan number and conservation of charge. + i) + + n g ^0 + K ii) + p g 0 + ^0 [4] P.T.O. Q2) a) b) Q3) a) b) State basic components of mass spectroscope. With necessary diagrams explain the working of Bainbridge and Jordan mass spectrograph state its advantages. [10] Discuss the violation of parity conservations in beta decay. [6] Show that the stoping power does not depend on the mass of particle but is a only function of its velocity and charge. [8] Discuss various aspects of collective model of nucleus. [8] Q4) a) In case of gamma decay; explain multipole radiations and state selection rules. [8] b) State three categories of semiconductor junction type detector and explain [8] any one in detail. Q5) a) Explain neutron-proton scattering at low energy. Find expressions for i) Scattering length ii) Phase-shift and iii) Total scattering cross-section. b) In case of elementary particles, explain terms i) Conservation of isopin and ii) Q6) a) [12] Conservation of strangeness. [4] Write a note on : Quark theory of elementary particles. [6] b) Discuss collective nuclear mode. [6] c) Why the study of p-p scattering is capable of much higher accuracy than n-p scattering? [4] Q7) a) Explain coherent scattering of slow neutrons. [6] b) Describe the principle and working of microtron. [6] c) Enlist the evidences for the existance of magic numbers. [4] rrrr [3722]-41 -2-

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Additional Info : M.Sc. PHYSICS, PHY UT - 801 : Nuclear Physics (Old Course) (2005 Pattern) (Semister - IV), Pune University
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