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9.%20Nuclear and Particle Physics NET-JRF VKS

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Brijmohan
Banaras Hindu University (BHU), Varanasi
PhD Condensed matter Physics

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fiziks Institute for NET/JRF, GATE, IIT-JAM, JEST, TIFR and GRE in PHYSICAL SCIENCES NUCLEAR AND PARTICLE PHYSICS NET/JRF (JUNE-2011) Q1. The radius of a Cu nucleus is measured to be 4.8 10-13 cm. 64 29 (A). The radius of a 27 12 Mg nucleus can be estimated to be (a) 2.86 10-13 cm Ans: (b) 5.2 10-13 cm (c) 3.6 10-13 cm (d) 8.6 10-13 cm (c) Solution: Since R R0 A 1/ 3 RMg RMg RCu AMg A Cu 1/ 3 27 64 1/ 3 3 3 RMg 4.8 10 13 3.6 10 13 cm. RCu 4 4 (B). The root-mean-square (r.m.s) energy of a nucleon in a nucleus of atomic number A in its ground state varies as: (a) A4 / 3 (c) A 1/ 3 (b) A1/ 3 (d) A 2 / 3 Ans: (c) Q2. A beam of pions ( +) is incident on a proton target, giving rise to the process +p n + + + + (A). Assuming that the decay proceeds through strong interactions, the total isospin I and its third component I3 for the decay products, are 3 (a) I , I 3 2 5 (c) I , I 3 2 Ans: 3 2 3 2 5 5 (b) I , I 3 2 2 1 1 (d) I , I 3 2 2 (c) Solution: p n ; I : 1 5 1 3 1 1 , I3 : 1 1 2 2 2 2 (B). Using isospin symmetry, the cross-section for the above process can be related to that of the process (a) n p (c) n p Ans: (b) p n (d) p n (c) Head office fiziks, H.No. 23, G.F, Jia Sarai, Near IIT, Hauz Khas, New Delhi-16 Phone: 011-26865455/+91-9871145498 Website: www.physicsbyfiziks.com Email: fiziks.physics@gmail.com Branch office Anand Institute of Mathematics, 28-B/6, Jia Sarai, Near IIT Hauz Khas, New Delhi-16 1

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