Escape of cosmic rays from perpendicular shocks in the interstellar magnetic field

We investigate the escape process from a perpendicular shock region of spherical in interstellar medium (ISM). The diffusive acceleration supernova remnants (SNRs) has been expected to accelerate cosmic rays (CRs) PeV scale without an upstream magnetic field amplification. estimate maximum energy CRs limited by region. By performing test particle simulations, we confirm theoretical estimation, showing that escape-limited is several 10 TeV for typical type Ia SNRs. Therefore, order SNRs ISM scale, amplification needed. characteristic could be origin spectral break around TeV, which was reported recent direct CR observations. In addition, show that, free expansion phase, rapid works on about 20% area whole surface, larger than size superluminal also discuss electrons shock.