parity in nuclear physics.

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Parity of a nucleus refers to the behaviour of the wave function(¥) under inversion of coordinates.
e.g if we replace x by -x, y by -y and z by -z and wave function remains the same, then it has even parity. On other hand, if it appears with negative sign, it has odd parity as shown below
      ¥(x,y,z)=¥(-x,-y,-z)   even parity
      ¥(x,y,z)= - ¥(-x,-y,-z)   Odd parity 

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