Investigation on the Asymmetrical Radical Formation in β-Irradiated D-and L-Alanines Using ESR Spectroscopy  

作　　者：王文清 赵健 丁翔 

机构地区：[1]Department of Technical Physics, Peking University, Beijing 100871 PRC

出　　处：《Chinese Science Bulletin》1993年第11期966-967,共2页

基　　金：Project supported by the Program-Specific Foundation for Doctoral Advisor of China

摘　　要：Studies on positron annihilation have shown that the positrons emitted from ²²Na decay favour the formation of the triplet positroniums in L-leucine. On the basis of the consideration about the difference in helicity between particles and positrons, β^- particle with its spin opposite to its momentum shows left-handed helicity, while positron with its spin parallel to its momentum shows fight-handed helicity. This letter specifically studies the effect of ⁹⁰Sr-⁹⁰Y β-irradiation.D-and L-alanines were separately packed in

关 键 词：handed MOMENTUM irradiation packed FIGHT QUARTZ POSITRON decay separately emitted 

分 类 号：N[自然科学总论]