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  Cosmic-ray tracks in astrophysical ices: Modeling with the Geant4-DNA Monte Carlo toolkit

Shingledecker, C. N., Incerti, S., Ivlev, A., Emfietzoglou, D., Kyriakou, I., Vasyunin, A., et al. (2020). Cosmic-ray tracks in astrophysical ices: Modeling with the Geant4-DNA Monte Carlo toolkit. The Astrophysical Journal, 904(2): 189. doi:10.3847/1538-4357/abbb30.

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Cosmic-ray tracks in astrophysical ices Modeling with the Geant4-DNA Monte Carlo toolkit.pdf (Any fulltext), 3MB
 
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Shingledecker, Christopher N.1, Author              
Incerti, Sebastien, Author
Ivlev, Alexei1, Author              
Emfietzoglou, Dimitris, Author
Kyriakou, Ioanna, Author
Vasyunin, Anton, Author
Caselli, Paola1, Author              
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1Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              

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 Abstract: Cosmic rays are ubiquitous in interstellar environments, and their bombardment of dust-grain ice mantles is a possible driver for the formation of complex, even prebiotic molecules. Yet, critical data that are essential for accurate modeling of this phenomenon, such as the average radii of cosmic-ray tracks in amorphous solid water (ASW) remain unconstrained. It is shown that cosmic-ray tracks in ASW can be approximated as a cylindrical volume with an average radius that is mostly independent of the initial particle energy. Interactions between energetic ions and both low-density amorphous (LDA) and high-density amorphous (HDA) ice targets are simulated using the Geant4-DNA Monte Carlo toolkit, which allows for tracking secondary electrons down to subexcitation energies in the material. We find the peak track-core radii, r cyl, for LDA and HDA ices to be 9.9 nm and 8.4 nm, respectively—somewhat less than double the value of 5 nm often assumed in astrochemical models.

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 Dates: 2020-12-03
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/abbb30
Other: LOCALID: 3286369
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 904 (2) Sequence Number: 189 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3