What is the relationship between symmetry energy and asymmetry energy?

[Alexitron]

Hi

Can someone please explain me what is the symmetry energy?
I know asymmetry energy in the weizsacker semiempirical mass formula which is the gap between a nucleus and it's isobar with Z=N.

 

[malawi_glenn]

google

http://www.ct.infn.it/~asialink/Workshops/Beijing/Talks/sfban.ppt

http://www.diva-portal.org/kth/theses/abstract.xsql?dbid=4469

 

[Alexitron]

Thanks.

 

[qnusmani]

Symmetry and asymmetry energy are the same things. There is some confusion on name in literature. Mostly in literature the symmetry energy is reffered to the (N-Z)^2/A term in the weizsacker semiempirical mass formula. But it is also reffered as the asymmetry energy.