Liquid-Drop Model . Nucleons are treated like molecules in a drop of liquid The nucleons interact strongly with one another They undergo frequent collisions as they jiggle around in the nucleus . The jiggling motion is analogous to the thermally agitated motion of molecules in a drop of liquid
Fusion Fission + E 10 8 56 2 Fe 6 4 2 0 50 100 150 200 250 Mass number, A
LIQUID DROP MODEL Geonge ouo in 1929) TREATED nucleus asDR0P0F LIQUID liquid duob Modal suggest5tnd the BE mucleus is Sum of thuu dilount smugiss (i) Volume. Ev ) Slace. Es
VOLUME ENERGY let U be the mugu associated uith a mucleen- nudien Band As this Bond umegy is 6 Bend unugy is shoud by tup nucleews
Fig. 11.13 In a tightly packed assembly of identical spheres, each interior sphere is in contact with 12 others
anu backe d thum each e in csntad with l2 E-(12) (40) 6U 2 Total BE f nucen 6AU to A
SUR FACE ENER 6y Nudeers nth, surface acc notin ermechon uoith l2 muclesns the su ace aua Es -44% This significant fon tight nuclei.
Fig. 11.14 A nucleon at the surface of a nucleus interacts with fewer other nucleons than one in the interior of the nucleus and hence its binding energy is less. The larger the nucleus the smaller the proportion of nucleons at the surface.
CoULOMB ENERGY Repulsion bdoem fau ( uotoms-result The potential mnag 4rEo Sice huu are ZZ-I) as
A3 Total BE Eb =EytEstEc 3 -Q A73
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