Energy Deposition by Cosmic Rays in the Molecular Cloud Using GEANT4 Code and Voyager I Data

Abstract Molecular clouds (MCs) are exposed to Galactic and extragalactic cosmic rays (CR) that trigger several physical physicochemical changes, including gas grain heating molecular destruction formation. Here we present a theoretical model describing the energy delivered by CRs, composed of protons, alphas, electrons taken from Voyager I measurements, into typical MC with 5400 M ? (composed mainly H density law r ?1.2 ) size around 1 × 10 6 au. The calculation was performed employing Monte Carlo toolkit GEANT4 obtain deposition per mass types secondary particles (considering nuclear hadron physics). results indicate incoming protons contribute most in all regions (maximum ?230 MeV g ?1 s at outer cloud). Secondary second important component for almost layers can deliver an rate ?130 region MC. Other cascade have their major delivery central denser core From temperature CR data I), observed (i) small bump distance 3 –2 4 au center, (ii) rapid decrease (roughly 7 K) between layer layer, (iii) that, 5 ( Av > 10), is below 15 K.