THE B/C and SUB-IRON/IRON COSMIC RAY RATIOS - FURTHER EVIDENCE in FAVOR of the SPIRAL-ARM DIFFUSION MODEL

David Benyamin, Ehud Nakar, Tsvi Piran, Nir J. Shaviv

نتاج البحث: نشر في مجلةمقالةمراجعة النظراء

ملخص

The boron to carbon (B/C) and sub-Fe/Fe ratios provide an important clue on cosmic ray (CR) propagation within the Galaxy. These ratios estimate the grammage that the CRs traverse as they propagate from their sources to Earth. Attempts to explain these ratios within the standard CR propagation models require ad hoc modifications and even with those these models necessitate inconsistent grammages to explain both ratios. As an alternative, physically motivated model, we have proposed that CRs originate preferably within the galactic spiral arms. CR propagation from dynamic spiral arms has important imprints on various secondary to primary ratios, such as the B/C ratio and the positron fraction. We use our spiral-arm diffusion model with the spallation network extended up to nickel to calculate the sub-Fe/Fe ratio. We show that without any additional parameters the spiral-arm model consistently explains both ratios with the same grammage, providing further evidence in favor of this model.

اللغة الأصليةالإنجليزيّة
رقم المقال47
دوريةAstrophysical Journal
مستوى الصوت826
رقم الإصدار1
المعرِّفات الرقمية للأشياء
حالة النشرنُشِر - 20 يوليو 2016

All Science Journal Classification (ASJC) codes

  • !!Astronomy and Astrophysics
  • !!Space and Planetary Science

بصمة

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