ch42-p019 - 19. If a nucleus contains Z protons and N...

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19. If a nucleus contains Z protons and N neutrons, its binding energy is EZ m N m m c Hn be = + b g 2 , where m H is the mass of a hydrogen atom, m n is the mass of a neutron, and m is the mass of the atom containing the nucleus of interest. If the masses are given in atomic mass units, then mass excesses are defined by ( )( ) 22 1, HH nn mc m c ∆= and () 2 . mA c This means c mc c 2 2 = + = + ,, and 2 mc = 2 . Ac ∆+ Thus, ( ) 2 , N Z N A
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