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The total kinetic energy carried by the products of the spontaneous fission of plutonium 鈥 240 is typically about 180 MeV. Use this to argue there that reduction in Coulomb repulsion is the major impulse behind the process. Assume for simplicity that the two fragment nuclei are of equal Z.

Short Answer

Expert verified

By fission, the binding energy would increase by 269.57鈥塎别痴 the Coulomb term, which contributes to the 180鈥塎别痴 kinetic energy of the daughter particle.

Step by step solution

01

Given data

Energy =180鈥塎别痴.

02

Formula of Semi-empirical binding Energy

Semi-empirical binding energy is given by the expression: BE=c1Ac2A2/3c3Z(Z1)A1/3c4(NZ)2A (1)

Where,c1=15.8MeV,c2=17.8MeV,c3=0.71MeV,鈥嬧赌c4=23.7MeV,Ais the mass number,Zis the atomic number, andNis the number of neutrons.

03

Check the Binding energy

The fission of plutonium- 240 into two particles with equal atomic numbers is:

84240Pu42100Mo+42100Mo+40n

The semi-empirical binding energy formula is,

BE=c1Ac2A2/3c3Z(Z1)Ac4(Z1)2A

And

Z=84,A=240,N=24084=156

The third term contribution to plutonium- 240 is,

BE3=c3Z(Z1)A1/3

Substitute values in the above equation, and we get,

BE3=(0.71鈥塎别痴)(84)(841)(240)1/3=796.55鈥塎别痴

Thethirdtermcontributiontomolybdenum-100is,

BE3=c3Z(Z1)A1/3

And

Z=42,A=100,N=10042=58

Substitute values in the above equation, and we get,

BE3=(0.71鈥塎别痴)(42)(421)(100)1/3=263.49鈥塎别痴

So the difference in the binding energy of the parent particle and the daughter particles is:

=796.55鈥塎别痴2(263.49鈥塎别痴)=269.57鈥塎别痴

By fission, the binding energy would increase by 269.57鈥塎别痴 by the Coulomb term, which contributes to the180鈥塎别痴 kinetic energy of the daughter particle.

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