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Creators/Authors contains: "Mathews, Grant J"

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  1. ; ; ; ; ; ; (, Physical Review D)
    We investigate photon, pion, and ρ -meson production from proton synchrotron radiation in the presence of strong magnetic fields. The proton decay widths and the luminosities of the emitted particles are calculated within a relativistic quantum framework that incorporates Landau quantization. A scaling rule is derived for the transition probability between different Landau levels. This allows an evaluation of transitions for extremely high Landau numbers exceeding 10 15 . Furthermore, we calculate the momentum distribution of the emitted particles by properly including the proton recoil effect associated with particle emission. The results differ significantly from conventional semiclassical approaches. 
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    Free, publicly-accessible full text available January 1, 2027
  2. ; ; ; ; ; ; (, The Astrophysical Journal)
    Abstract We study the evolution of rapid neutron-capture process (r-process) isotopes in the galaxy. We analyze relative contributions from core-collapse supernovae (CCSNe), neutron star mergers, and collapsars under a range of astrophysical conditions and nuclear input data. Here we show that, although the r-process in each of these sites can lead to a similar (universal) elemental distribution, the detailed isotopic abundances can differ from one site to another. These differences may allow for the identification of which sources contributed to the early evolution of r-process material in the galaxy. Our simulations suggest that the early evolution was dominated by CCSNe and collapsar r-process nucleosynthesis. This conclusion may be testable if the next generation of observatories can deduce isotopic r-process abundances. 
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  3. ; ; ; ; ; (, PANIC2021 Proceedings)
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  4. ; ; ; ; ; (, Physics Letters B)
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  5. ; ; ; ; (, Physics Letters B)
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  6. ; ; ; ; (, Physics Letters B)
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  7. ; ; ; ; ; ; ; ; ; ; et al (, The Astrophysical Journal)
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  8. ; ; ; ; (, AIP Conference Proceedings)
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