High Energy Cosmic Rays from Young Neutron Stars

Abstract

Cosmic ray spectrum has an intensity enhancement at energy range 10 14–16 eV/nuc. Recently Takahasi et al. (1986) called an attention to chemical composition there. Although the data still contain large uncertainties, they argued an overabundance of calcium at high energies (Ca/Fe ≥ 2 above 10 14 eV/nucleus) and some enhancements of medium heavy nuclei (C ∼ Ar) instead of no anomalous p, He, and Fe abundances.