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Pune University - Sem - IV : Nuclear Physics, April 2010

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Total No. of Questions : 7] P889 [Total No. of Pages : 3 [3722]-401 M. Sc. PHYSICS PHY UTN - 801 : Nuclear Physics (New Course) (2008 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) Evaluate the maximum energy shift that can be observed for a body whose quadropole moment is Q. [4] b) For a graphite a = 0.003 barn, Lm = 54 cm, o = 364 cm2 and for Uranium a = 698 barn and = 2.08. (Given p = 1 & = 1) Calculate thermal utilization factor, k and thermal diffusion length for the mixture. [4] c) Obtain selection rules for magnetic multipole radiations in case of gammadecay for electric and magnetic dipole, quadrople. [4] d) Compute the maximum energy of the Compton recoil electrons resulting from the absorption in Al of 2.19 MeV -ray. (rest mass of electron m0 = 9.1091 10 31 kg) e) Which of the following reactions are allowed and forbidden under the conservation of strangeness, conservation of baryon number and conservation of charge. [4] i) + + n k0 + + & ii) f) [4] + p 0 + 0 Calculate the total cross-section for n-p scattering at neutron energy 2MeV in lab system. (Given : at = 5.38F, as = 23.7F, rot = 1.7F and ros = 2.4F & M = 1.6748 10 27 kg, ! = 1.0549 10 34 Js) [4] P.T.O. Q2) a) Explain principle, construction and working of a Bain bridge and Jordan Mass spectrometer used to determine the mass of nucleus. State it s advantages. [8] b) By using Schroedinger equation, obtain expressions for phase-shift and scattering cross-section in case of low energy n-p scattering. [8] Q3) a) Describe Gamow theory of alpha particle decay and show that : 2 2m T = exp !2 r1 [v(r ) E] 1 2 dr R [8] b) In case of nuclear fission reactors, explain chain reaction with uranium and obtain four-factor formula. [8] Q4) a) With suitable diagrams, describe the working of Van-de-Graff accelerator and explain the action of accelerating tube. [8] b) Give the classification of elementary particle interactions and explain each in brief. [8] Q5) a) In case of interaction of radiations with matter, describe i) b) stopping power and ii) range for electrons Describe the construction of microton and obtain the expressions for i) change in period and ii) Q6) a) [8] output kinetic energy [8] In case of elementary particles, explain : i) Conservation of baryon number ii) [8] Conservation of Isospin iii) Conservation of hypercharge and iv) Conservation of strangeness. b) [3722]-401 Explain construction and working of proportional counter. Mentions it s applications. [8] -2- Q7) a) b) Explain coherent scattering of slow neutrons by Ortho and Para hydrogen molecules and explain the spin of neutron. [6] Describe the reactor design with reference to i) Fuel ii) Moderators and reflectors iii) Reactor coolants iv) Control materials and v) Reactor shielding rrrr [3722]-401 -3- [10]

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Additional Info : M.Sc. PHYSICS, PHY UTN - 801 : Nuclear Physics (New Course) (2008 Pattern) (Semister - IV), Pune University
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