Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-06-24
Phys.Rev. C66 (2002) 044602
Physics
Nuclear Physics
Nuclear Theory
Revtex, 10 pages including 8 figures and 2 tables
Scientific paper
10.1103/PhysRevC.66.044602
In efforts to determine phase transitions in the disintegration of highly excited heavy nuclei, a popular practice is to parametrise the yields of isotopes as a function of temperature in the form $Y(z)=z^{-\tau}f(z^{\sigma}(T-T_0))$, where $Y(z)$'s are the measured yields and $\tau, \sigma$ and $T_0$ are fitted to the yields. Here $T_0$ would be interpreted as the phase transition temperature. For finite systems such as those obtained in nuclear collisions, this parametrisation is only approximate and hence allows for extraction of $T_0$ in more than one way. In this work we look in detail at how values of $T_0$ differ, depending on methods of extraction. It should be mentioned that for finite systems, this approximate parametrisation works not only at the critical point, but also for first order phase transitions (at least in some models). Thus the approximate fit is no guarantee that one is seeing a critical phenomenon. A different but more conventional search for the nuclear phase transition would look for a maximum in the specific heat as a function of temperature $T_2$. In this case $T_2$ is interpreted as the phase transition temperature. Ideally $T_0$ and $T_2$ would coincide. We invesigate this possibility, both in theory and from the ISiS data, performing both canonical ($T$) and microcanonical ($e=E^*/A$) calculations. Although more than one value of $T_0$ can be extracted from the approximate parmetrisation, the work here points to the best value from among the choices. Several interesting results, seen in theoretical calculations, are borne out in experiment.
Beaulieu L.
Breuer Herbert
Das Champak B.
Gupta Subal Das
Korteling Ralph. G.
No associations
LandOfFree
Tracking the phase-transition energy in disassembly of hot nuclei does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Tracking the phase-transition energy in disassembly of hot nuclei, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tracking the phase-transition energy in disassembly of hot nuclei will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-3115