Investigation Of The Fragmentation In The Reaction400A MeV¹²C In CH₂

The fragmentation of heavy ions in high energetic nucleus-nucleus interaction is very important for many different fields ofnuclear physical, astrophysics, radio-biology and radiation protection.The investigation of the total charge-changing cross sections, thepartial cross sections of projectile fragments production and angulardistribution of projectile fragments not only can help us to understandthe fragmentation properties of heavy ions at intermediate and highenergy, provide the more experimental foundations for refining thetheoretical model of the origination and propagation of galacticcosmic-rays, but also estimate the radiation close received bycosmonaut during space station, and provide the experimentalinformation of heavy ions medical therapy and cancer treatment.CH2targets interleaved with CR-39plastic nuclear track detectorwere irradiated with400A MeV carbon ions. The exposures weremade at NIRS, Japan. By calculating and analyzing the totalcharge-changing cross-section and the partial cross-section, it isfound that the total charge-changing cross-section is consistent withother experimental results and the predictions of Bradt-Peterssemi-classical formula，within experimental error. The totalcharge-changing cross-section depends on the target mass numberand the projectile mass number. The total cross section increases asa function of target mass number and projectile mass number. This paper also study and analysis the distribution of primaryparticle scattering angle and the secondary particles emission angle,results show that the primary particle scattering angle is smaller thansecondary particles emission angle is small, the scope of thesecondary particles emission angle is wider than the primary particlescattering angle.