Lower Limits on the Nucleosynthesis of 44Ti and 60Fe in the Dynamic Spiral-arm Cosmic-Ray Propagation Model

David Benyamin, Nir J. Shaviv

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Abstract

We have previously focused on studying the electron-capture isotopes within the dynamic spiral-arms cosmic-rays propagation model and empirically derived the energy dependence of the electron attachment rate using the observation of 49Ti/49V and 51V/51Cr ratios in cosmic rays. We have also shown how this relation recovers the energy dependence seen in the lab measurements. In this work, we use this relation to construct the 44Ti/44Ca ratio and place a lower limit on the amount of 44Ti that is required for it to be nucleosynthesized at the source. The results also imply that the acceleration process of the radioisotopes cannot be much longer than a century timescale (or else the required nucleosynthesized amount has to be correspondingly larger). We also provide a similar lower limit on the source 60Fe by comparing to the recently observed 60Fe/56Fe.

Original languageAmerican English
Article number86
JournalAstrophysical Journal
Volume863
Issue number1
DOIs
StatePublished - 10 Aug 2018

Bibliographical note

Publisher Copyright:
© 2018. The American Astronomical Society. All rights reserved.

Keywords

  • Galaxy: kinematics and dynamics
  • cosmic rays
  • diffusion

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