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Kai, Takeshi; Yonetani, Yoshiteru*
no journal, ,
Study for radiation DNA damage is very important to understand initial factors for mutation and cancer inductions. From much investigation for DNA base damage, oxidative and reductive base damage are much detected, rather than abasic damage originated from molecular dissociation. To reveal the reason, the dynamic behavior of secondary electrons was analyzed using semi-classical dynamic Monte-Carlo code developed in this study. From the results, it was found that the abasic damage was slightly produced because 15% of electronic excited electrons were formed in liquid water. The results will contribute to analyses for the radiation DNA damage, and will provide us a significant fundamental insight for formation of deleterious complex clustered DNA damage leading further biological effects.
Kai, Takeshi; Ishida, Akira*; Oshima, Nagayasu*
no journal, ,
When a positron was injected into the condensed phase, positronium (Ps) which constructs of an electron and a positron was generated. Although we expect that Bose-Einstein condensation (BEC) using the densely positroniums creates newly physics such as gravity accurate measurement of antimatter and annihilation gamma-rays laser, the BEC have never been achieved. The aims of this study are that fundamental explication of Ps generation as well as elucidation of experimental condition for Ps-BEC achievement from the positrons deceleration simulation in the condensed phase. For the aims, we applied a dynamic Monte Carlo code of the electrons to deceleration simulation of positrons bunch. We present current states of development of the high dense positrons transport simulation in the condensed phase.