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Nuclear fragmentation: sampling the instabilities of binary systems.

V Baran1, M Colonna, M Di Toro

  • 1Laboratori Nazionali del Sud, Via S. Sofia 44, I-95123 Catania, Italy and University of Catania and NIPNE-HH, Bucharest, Romania.

Physical Review Letters
|June 1, 2001
PubMed
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We found that attractive interactions in asymmetric nuclear matter can cause a new type of liquid-gas phase transition, driven by isoscalar fluctuations, which is relevant for radioactive beam experiments.

Area of Science:

  • Nuclear physics
  • Condensed matter physics
  • Quantum chemistry

Background:

  • Asymmetric nuclear matter (ANM) is crucial for understanding nuclear structure and reactions.
  • General two-component systems exhibit mechanical and chemical instabilities.
  • Previous studies focused on isovector fluctuations in nuclear matter instabilities.

Purpose of the Study:

  • Derive stability conditions for ANM.
  • Relate these conditions to mechanical and chemical instabilities in two-component systems.
  • Investigate the role of attractive interactions in ANM instabilities.

Main Methods:

  • Theoretical derivation of stability conditions.
  • Analysis of fluctuations in two-component systems.
  • Comparison with existing models of nuclear matter.

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Main Results:

  • Identified stability conditions for ANM.
  • Demonstrated that attractive interactions lead to isoscalar instability.
  • Showed this differs from typical isovector-driven instabilities.
  • Revealed a novel liquid-gas phase transition mechanism.

Conclusions:

  • Attractive interactions in ANM can trigger instabilities via isoscalar fluctuations.
  • This leads to a new type of liquid-gas phase transition.
  • Findings are relevant for fragmentation experiments with radioactive beams.