Nuclear and Particle Physics (CSIR Physical Sciences): Questions 1 - 4 of 13

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Question number: 1

» Nuclear and Particle Physics » Reaction Mechanism

Appeared in Year: 2014

MCQ▾

Question

Consider the four processes,

(i) p+n+e++νe

(ii) Λ0p++e++νe

(iii) π+e++νe

(iv) π0γ+γ

Which of the above is/are forbidden for free particles? (December)

Choices

Choice (4) Response

a.

(i) and (ii)

b.

only (ii)

c.

(i) and (iv)

d.

(ii) and (iv)

Question number: 2

» Nuclear and Particle Physics » Semiempirical Mass Formula

Appeared in Year: 2014

MCQ▾

Question

If the binding energy B of a nucleus (mass number A and charge Z) is given by,

B=aVAaSA23asym(2ZA)2AaCZ2A13 ; where aV=16MeV,aS=16MeV,asym=24MeVandaC=0.75MeV , then the Z for the most stable isobar for a nucleus with A=216 is –

(December)

Choices

Choice (4) Response

a.

68

b.

92

c.

84

d.

72

Question number: 3

» Nuclear and Particle Physics » Quark Model

Appeared in Year: 2014

MCQ▾

Question

In a classical model, a scalar (spin-0) meson consists of a quark and an antiquark bound by a potential, V(r)=ar+br Where a=200MeVfm1 and b=100MeVfm . If the messes of the quark and antiquark are negligible, the mass of the meson can be estimated as approximately – (June – 2014)

Choices

Choice (4) Response

a.

353MeVc2

b.

425MeVc2

c.

283MeVc2

d.

141MeVc2

Question number: 4

» Nuclear and Particle Physics » Mesons

Appeared in Year: 2013

MCQ▾

Question

Muons are produced through the annihilation of particle a and its antiparticle, namely the process, a+a¯μ++μ A muon has a rest mass of 105MeVc2 and its proper life time is 2μs . If the center of mass energy of the collision is 2.1GeV in the laboratory frame that coincides with the center – of – mass frame, then the fraction of muons that will decay before they reach a detector placed 6 km away from the interaction point is – (June)

Choices

Choice (4) Response

a.

e10

b.

1e2

c.

e1

d.

1e1

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