skip to main content

DOE PAGESDOE PAGES

This content will become publicly available on July 2, 2019

Title: Cosmic-ray propagation with DRAGON2: II. Nuclear interactions with the interstellar gas

Understanding the isotopic composition of cosmic rays (CRs) observed near Earth represents a milestone towards the identification of their origin. Local fluxes contain all the known stable and long-lived isotopes, reflecting the complex history of primaries and secondaries as they traverse the interstellar medium. For that reason, a numerical code which aims at describing the CR transport in the Galaxy must unavoidably rely on accurate modelling of the production of secondary particles. Here, we provide a detailed description of the nuclear cross sections and decay network as implemented in the forthcoming release of the galactic propagation code DRAGON2. We present the secondary production models implemented in the code and we apply the different prescriptions to compute quantities of interest to interpret local CR fluxes (e.g., nuclear fragmentation timescales, secondary and tertiary source terms). In particular, we develop a nuclear secondary production model aimed at accurately computing the light secondary fluxes (namely: Li, Be, B) above 1 GeV/n. This result is achieved by fitting existing empirical or semi-empirical formalisms to a large sample of measurements in the energy range 100 MeV/n to 100 GeV/n and by considering the contribution of the most relevant decaying isotopes up to iron. Concerning secondary antiparticlesmore » (positrons and antiprotons), we describe a collection of models taken from the literature, and provide a detailed quantitative comparison.« less
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6]
  1. Gran Sasso Science Inst. and National Inst. of Nuclear Physics (INFN), L'Aquila (Italy). Gran Sasso National Lab. (INFN-LNGS)
  2. Univ. of Amsterdam (Netherlands). Inst. of Physics and Gravitation & Astroparticle Physics Amsterdam (GRAPPA)
  3. Technical Univ. Munchen, Garching (Germany). Dept. of Physics; RWTH Aachen Univ. (Germany). Inst. for Theoretical Particle Physics and Cosmology (TTK)
  4. SLAC National Accelerator Lab. and Stanford Univ., Stanford, CA (United States). W.W. Hansen Experimental Physics Lab., Kavli Inst. for Particle Astrophysics and Cosmology and Dept. of Physics
  5. National Inst. of Nuclear Physics (INFN), Pisa (Italy)
  6. National Inst. of Nuclear Physics (INFN), Bari (Italy)
Publication Date:
Grant/Contract Number:
AC02-76SF00515; 751311; 81303
Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2018; Journal Issue: 07; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE; European Commission (EC); German-Israeli Foundation for Scientific Research and Development (GIF); National Aeronautic and Space Administration (NASA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galactic cosmic rays; cross sections; numerical methods
OSTI Identifier:
1461832