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Related Experiment Videos

r-Process in Neutron Star Mergers.

Freiburghaus, Rosswog, Thielemann

    The Astrophysical Journal
    |October 20, 1999
    PubMed
    Summary

    Mergers of two neutron stars can explain the origin of heavy elements formed by rapid neutron capture (r-process). The ejected material from these mergers matches observed galactic abundances.

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    Area of Science:

    • Astrophysics
    • Nuclear Physics
    • Cosmochemistry

    Background:

    • The origin of heavy elements produced via the rapid neutron capture process (r-process) remains a significant unsolved problem in astrophysics.
    • Several astrophysical sites have been proposed, but none have been definitively confirmed.

    Purpose of the Study:

    • To investigate the neutron star merger scenario as a potential production site for r-process elements.
    • To determine if this scenario can reproduce the observed abundances of heavy elements in the Milky Way.

    Main Methods:

    • Combining results from hydrodynamic simulations of neutron star mergers.
    • Performing full nuclear network calculations on the ejected material.

    Main Results:

    • Neutron star mergers eject sufficient material to account for the galactic abundance of r-process nuclei.
    • Calculated abundances show excellent agreement with the observed solar r-pattern for nuclei heavier than the A ≈ 130 peak, provided a proton-to-nucleon ratio (Ye) of approximately 0.1.

    Conclusions:

    • Neutron star mergers are a highly plausible site for the r-process nucleosynthesis.
    • This scenario successfully explains the origin of a significant fraction of the heaviest elements observed in the universe.

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