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Nuclear reactions involving tin isotopes (Sn) at 50 MeV show that the neutron-rich gas phase at freeze-out suggests rapid neutron diffusion during heavy-ion collisions.

Area of Science:

  • Nuclear Physics
  • Heavy-Ion Collisions
  • Nuclear Reactions

Background:

  • Understanding the isotopic composition of nuclear matter is crucial for nuclear astrophysics and reaction dynamics.
  • Previous studies have explored nuclear fragmentation and particle emission in heavy-ion collisions.

Purpose of the Study:

  • To measure isotopic distributions of light particles and intermediate mass fragments.
  • To investigate the isotopic composition of the gas phase at freeze-out in tin-tin collisions.
  • To compare the neutron-to-proton ratio in the gas and liquid phases.

Main Methods:

  • Collisions of 112Sn+112Sn, 112Sn+124Sn, 124Sn+112Sn, and 124Sn+124Sn at E/A = 50 MeV.
  • Measurement of isotopic distributions for light particles and intermediate mass fragments.

Related Experiment Videos

  • Utilizing isotope, isotone, and isobar yield ratios to determine gas phase composition.

    • Main Results:

    • The gas phase at freeze-out is found to be enriched in neutrons compared to the liquid phase (bound nuclei).
    • Isotopic distributions were measured for various tin isotope combinations.
    • Yield ratios provided insights into the freeze-out composition.

    Conclusions:

    • Neutron diffusion appears to be as rapid as, or faster than, fragment production during these collisions.
    • The observed neutron enrichment supports models of rapid neutron transport in nuclear reactions.
    • This study provides experimental evidence for neutron-rich conditions at freeze-out.