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Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007nimpb.261..996s&link_type=abstract
Nuclear Instruments and Methods in Physics Research Section B, Volume 261, Issue 1-2, p. 996-999.
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Low And Intermediate Energy Heavy-Ion Reactions, Strongly Damped Collisions, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments
Scientific paper
The process of nuclear multifragmentation leads to thermodynamic conditions akin to those encountered in the collapse/explosion of massive stars. Thus, the knowledge obtained from studying multifragmentation may be applied to describe matter distribution in supernova. Along these lines, the present study focuses on the symmetry energy of hot fragments produced in the multifragmentation of neutron-rich systems following collisions near the Fermi energy. The experiments consist of high-resolution mass spectrometric measurements of the isotopic and velocity distributions of heavy projectile fragments. The data were systematically compared to calculations with the Statistical Multifragmentation Model (SMM). The study indicates a gradual decrease of the symmetry energy coefficient from the standard value of ˜25 MeV in the compound nucleus regime (E∗/A < 2 MeV) towards ˜15 MeV in the bulk multifragmentation regime (E∗/A > 4 MeV). The isotopic distributions of the hot fragments are very wide and extend towards or beyond the neutron drip-line. These findings may have important implications to the composition and evolution of hot astrophysical environments, such as core-collapse supernova and the course of the ensuing nucleosynthesis processes, such as the r-process.
Botvina A. S.
Jandel Magnus
Keksis A. L.
Shetty D. V.
Souliotis G. A.
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