SHINGLEDECKER, Christopher; INCERTI, Sébastien; IVLEV, Alexei; EMFIETZOGLOU, Dimitris; KYRIAKOU, Ioanna; VASYUNIN, Anton; CASELLI, Paola

doi:10.3847/1538-4357/abbb30

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SHINGLEDECKER, Christopher

INCERTI, Sébastien
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

IVLEV, Alexei

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The Astrophysical Journal. 2020-12-01, vol. 904, n° 2, p. 189

American Astronomical Society

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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 a low-density amorphous (LDA) and high-density amorphous (HDA) ice target 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.< Leer menos

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Cosmic-Ray Tracks in Astrophysical Ices: Modeling with the Geant4-DNA Monte Carlo Toolkit

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