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Caloric curve for mononuclear configurations.

L G Sobotka1, R J Charity, J Tõke

  • 1Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA.

Physical Review Letters
|November 5, 2004
PubMed
Summary

The caloric curve in nuclear physics shows a plateau due to decreasing density, not phase changes. Mononuclear configurations are metastable against fission and multifragmentation.

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Area of Science:

  • Nuclear Physics
  • Statistical Mechanics
  • Thermodynamics

Background:

  • The caloric curve, a key indicator of nuclear phase transitions, is studied in the context of mononuclear configurations.
  • Understanding nuclear fragmentation and the behavior of highly excited nuclei is crucial for nuclear reaction dynamics.

Purpose of the Study:

  • To investigate the caloric curve for mononuclear configurations using a schematic model.
  • To analyze the influence of density and effective-mass profiles on nuclear entropy.
  • To clarify the origins of the plateau observed in the caloric curve of finite nuclei.

Main Methods:

  • Utilized a schematic model to study the caloric curve of mononuclear systems.
  • Investigated the relationship between entropy and nuclear density and effective-mass profiles.
  • Analyzed the stability of the mononuclear regime concerning binary fission and multifragmentation.

Main Results:

  • The caloric curve plateau in finite nuclei results from decreasing density and correlation destruction, not phase coexistence.
  • The mononuclear regime is found to be metastable, susceptible to binary fission at low excitation and multifragmentation at high excitation.
  • The developed statistical framework effectively models scenarios favoring highly excited mononuclei.

Conclusions:

  • The study provides a new perspective on the caloric curve, attributing the plateau to structural changes rather than phase transitions.
  • The metastability of mononuclear configurations highlights their transient nature in nuclear reactions.
  • The presented statistical framework is applicable for analyzing experimental conditions that promote the formation of excited mononuclear systems.

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