Spallation of r-Process Nuclei Ejected from a Neutron Star Merger

Xilu Wang, Brian D. Fields, Matthew Mumpower, Trevor Sprouse, Rebecca Surman, Nicole Vassh

Research output: Contribution to journalConference articlepeer-review


Neutron star mergers (NSMs) are rapid neutron capture (r-process) nucleosynthesis sites, which eject materials at high velocities, from 0.1c to as high as 0.6c. Thus the r-process nuclei ejected from a NSM event are sufficiently energetic to initiate spallation reactions with the interstellar medium (ISM) particles. With a thick-Target model for the propagation of high-speed heavy nuclei in the ISM, we find that spallation reactions may shift the r-process abundance patterns towards solar data, particularly around the low-mass edges of the r-process peaks where neighboring nuclei have very different abundances. The spallation effects depend both on the astrophysical conditions of the r-process nuclei and nuclear physics inputs for the nucleosynthesis calculations and the propagation process. This work extends that of [Wang et al.(2019)] by focusing on the influence of nuclear physics variations on spallation effects.

Original languageEnglish (US)
Article number012049
JournalJournal of Physics: Conference Series
Issue number1
StatePublished - Oct 21 2020
Event9th Nuclear Physics in Astrophysics, NPA 2019 - Frankfurt, Germany
Duration: Sep 15 2019Sep 20 2019

ASJC Scopus subject areas

  • General Physics and Astronomy


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