The mass of a nucleus AZ X is less than the sum of the masses of A-Z number of neutrons and Z number of protons in the nucleus- The energy equivalent to the corresponding mass difference is known as the binding energy of the nucleus- A heavy nucleus of mass M can break into two light nuclei of masses m1 and m2 only if m1 - m2 M- The masses of some neutral atoms are given in the table below- 11 H 1-007825 u 21 H 2-014102 u- 63 Li 6-015123 u 73Li 7-016004 u- 15264 Gd 151-919803 u 20682 Pb 205-974455 u- 31 H 3-016050 u 41 He 4-002603 u- 7030 Zn 69-925325 u 8234 Se 81-916709 u- 20983 Bi 208-980388 u 21084 Po 209-982876 u- - 1 u - 932 MeVc2

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Alpha Decay

The mass of a...

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The mass of a nucleus $_{Z}^{A} X$ is less than the sum of the masses of $(A - Z)$ number of neutrons and Z number of protons in the nucleus. The energy equivalent to the corresponding mass difference is known as the binding energy of the nucleus. A heavy nucleus of mass $M$ can break into two light nuclei of masses $m_{1}$ and $m_{2}$ only if $(m_{1} + m_{2}) < M .$ Also two light nuclei of masses $m_{3}$ and $m_{4}$ can undergo complete fusion and form a heavy nucleus of mass $M^{'}$ only if $(m_{3} + m_{4}) > M^{'}$ . The masses of some neutral atoms are given in the table below:

$\begin{matrix} _{1}^{1} H & 1.007825 u & _{1}^{2} H & 2.014102 u_{3}^{6} L i & 6.015123 u & _{3}^{7} L i & 7.016004 u_{64}^{152} G d & 151.919803 u & _{82}^{206} P b & 205.974455 u_{1}^{3} H & 3.016050 u & _{1}^{4} H e & 4.002603 u_{30}^{70} Z n & 69.925325 u & _{34}^{82} S e & 81.916709 u_{83}^{209} B i & 208.980388 u & _{84}^{210} P o & 209.982876 u \end{matrix}$
$(1 u = 932 \frac{M e V}{c^{2}})$

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