A new verst~n of the in-medtum quark condensate is applted to study the Okatnoto-Nolen-Schtffeianoinaly The results show that the theoretical i m s s difference of tntrror nuclei due to the neuti-on-proton ?nuss dt fference have the 1-rght magnitude needed to explain this atio.maly, and wry slowly with nucleai-mass number-A .
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