Publication | Closed Access
R-process nucleosynthesis in the high-entropy supernova bubble
349
Citations
0
References
1992
Year
The high‑entropy, high‑temperature bubble outside the nascent neutron star in core‑collapse supernovae provides an environment where most nucleons are free neutrons or alpha particles, yielding many neutrons per seed nucleus despite modest neutron excess. Neutrino irradiation may smooth the final abundance distribution in this bubble. The amount of r‑process material ejected per event matches galactic evolution requirements, and when averaged over varying neutron excess the resulting abundance curve reproduces the solar‑system r‑process pattern provided the entropy per baryon is sufficiently high. Published in The Astrophysical Journal (Nov 1992), DOI 10.1086/171957.
view Abstract Citations (295) References (55) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS R-Process Nucleosynthesis in the High-Entropy Supernova Bubble Meyer, B. S. ; Mathews, G. J. ; Howard, W. M. ; Woosley, S. E. ; Hoffman, R. D. Abstract We show that the high-temperature, high-entropy evacuated region outside the recent neutron star in a core-collapse supernova may be an ideal r-process site. In this high-entropy environment it is possible that most nucleons are in the form of free neutrons or bound into alpha particles. Thus, there can be many neutrons per seed nucleus even though the material is not particularly neutron rich. The predicted amount of r-process material ejected per event from this environment agrees well with that required by simple galactic evolution arguments. When averaged over regions of different neutron excess in the supernova ejecta, the calculated r-process abundance curve can give a good representation of the solar-system r-process abundances as long as the entropy per baryon is sufficiently high. Neutrino irradiation may aid in smoothing the final abundance distribution. Publication: The Astrophysical Journal Pub Date: November 1992 DOI: 10.1086/171957 Bibcode: 1992ApJ...399..656M Keywords: Entropy; Neutron Stars; Nuclear Fusion; Plasma Bubbles; Supernovae; Abundance; Hot Stars; Neutrinos; Stellar Temperature; Astrophysics; NUCLEAR REACTIONS; NUCLEOSYNTHESIS; ABUNDANCES; STARS: SUPERNOVAE: GENERAL full text sources ADS |