Microscopic Analysis of Nuclear Structure and Thermal Behavior in the Superheavy Region

Level density and thermodynamic quantities of ۲۵۰Cm۹۶ and ۲۸۷Mc۱۱۵ super-heavy isotopes are calculated based on time dependent pairing energy bach shifted Fermi gas model T DP − BF GM. Woods-Saxon potential is considered for interaction of nucleons inside the nucleus. A temperature dependent pairing energy is also considered. In order to calculate level density and thermodynamic quantities like temperature, entropy and heat capacity of ۲۵۰Cm۹۶ and ۲۸۷Mc۱۱۵ super-heavy isotopes, the level density of theses nuclei are calculated by considering the effects of nuclear rotation and vibration. Variation of level density, entropy, temperature and heat capacity as a function of excitation energy for under consideration isotopes are compared by considering the effects of rotation and vibration. Obtained results on variation of heat capacity as a function of excitation energy indicate well the Cooper pair breaking and cooling effects of these super-heavy isotopes. The novelty of this work is the discontinuity in the specific heat at constant volume for these super-heavy isotopes that are happen in the excitation energies around ۲.۵ MeV for ۲۵۰Cm۹۶ and ۱MeV for ۲۸۷Mc۱۱۵ super-heavy isotopes, which indicates a phase transition from the superfluid state to normal matter.

کلیدواژه ها:

thermodynamic quantities ، level density ، super-heavy isotopes ، temperature ، Entropy ، heat capacity