Shape transitions in hot rotating strontium and zirconium isotopes - art. no. 014302

Using the Landau theory of phase transitions we investigate the shape evolu tion of strontium and zirconium isotopes as a function of temperature and s pin. The expansion of the free energy up to sixth power in beta is used in these calculations. The spin dependence is introduced by additional constan ts which are obtained by fitting with the temperature-dependent moment of i nertia. Thermal fluctuations are included in the usual way. Orientation flu ctuations have been ignored in these calculations. We show that in the pres ence of thermal fluctuations, the average shapes differ from the most proba ble shapes.