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Liquid drop model

  1. Aug 22, 2011 #1
    the atomic nucleus mass is given by

    b083043e60e6c55a5e0949f52fd64fc9.png

    but why is it a minus away of binding energy / c2 = mass of the empty parts of the nucleus?

    shouldn't it be a plus?

    mass of nucleus = proton mass + neutron mass + mass of empty parts of the nucleus?
     
  2. jcsd
  3. Aug 22, 2011 #2

    xts

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    Binding energy is an energy you must provide to separate nucleons. So you have energy conservation: mass of nucleus + energy required to separate nucleons = sum of masses of nucleons
     
  4. Aug 22, 2011 #3
    oh i see than kyou
     
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