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Abstract:
By means of the imaginary time Green’s function method, we extend the one pion exchange potential (OPEP) of the nudeon-nucieon interaction to the finite temperature. We sum up ail the bubble diagrams and find that the temperature effect on OPEP is small at the low temperature region but large at the high temperature region. The effective mass of pion field Mπ(T) will become imaginary at the critical temperature Tc = 177 MeV. It means that the attractive OPEP will disappear at Tc and the Phase transition takes place.
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