Excitation energy as a basic variable to control nuclear disassembly
1 CCAST (World Laboratory), P. O. Box 8730, Beijing 100080, P.R. China
2 Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, Shanghai 201800, China
3 Fudan - T. D. Lee Physics Laboratory, Fudan University, Shanghai 200433, P.R. China
4 East China Normal University, Shanghai 200053, P.R. China
Received: 25 November 1998 /Revised version: 20 January 1999 Communicated by B. Povh
Thermodynamical features of Xe system is investigated as functions of temperature and freeze-out density in the frame of lattice gas model. The calculation shows different temperature dependence of physical observables at different freeze-out density. In this case, the critical temperature when the phase transition takes place depends on the freeze-out density. However, a unique critical excitation energy reveals regardless of freeze-out density when the excitation energy is used as a variable instead of temperature. Moreover, the different behavior of other physical observables with temperature due to different vanishes when excitation energy replaces temperature. It indicates that the excitation energy can be seen as a more basic quantity to control nuclear disassembly.
05.50.+q Lattice theory and statistics (Ising, Potts, etc.) - 24.60.-k Statistical theory and fluctuations - 25.70.Pq Multifragment emission and correlations