Brian D. Fields

TL;DR: The second part of a two-part series highlighting the most well-known high-energy cosmic accelerators and contributions that MeV gamma-ray astronomy will bring to understanding their energetic particle phenomena is presented in this article.

TL;DR: In this paper, the authors adopt a thick target model for the propagation of high-speed heavy nuclei in the interstellar medium, similar to the transport of cosmic rays, and find that spallation may create observable perturbations to NSM isotopic abundances, particularly around the low-mass edges of the $\textit{r}$-process peaks where neighboring nuclei have very different abundances.

TL;DR: The nature of the massive Compact Halo objects seen in microlensing experiments and interpreted as dark matter in the Halo of our Galaxy remains a mystery as discussed by the authors, and arguments are presented that these events are probably not ordinary stellar or substellar objects, i.e. not faint stars, brown dwarfs, white dwarfs or neutron stars.

TL;DR: In this article, the influence of nuclear physics variations on spallation effects on the abundance of the r-process nucleosynthesis sites in the ISM has been investigated and it was shown that spallations reactions may shift the abundance patterns towards solar data, particularly around the low-mass edges of the R-process peaks where neighboring nuclei have very different abundances.

TL;DR: In this paper, the authors present an analytical description of the energy consumption of the population of cosmic accretion shocks, for a concordance cosmology (Ωm + ΩΛ = 1), and investigate the effect of environmental factors such as local clustering properties and filament preheating on the statistical properties of these shocks.