2014/12/10 中国科学技术大学大一新生《科学与社会》研讨课 《反物质世界的探索》 Parity violation discovered WU,Chien Shiung 1912-1997 1956: studied radioactive B-decay of polarized Co6o nuclei: Co60→Ni60ev She found an asymmetry: more electrons are emitted opposite to the nuclear spin direction than along it 邦角 Violation of left-right symmetry the "mirror" BETA RAYS mitted along J direction Mirror world In the "real real world electrons are are different emitted opposite to the J direction L-R symmetry BETA RAYS is violated. (ELECTRONS) THIS WORLD 物理学院叶邦角教授主讲 版权所有，严禁传播 102014/12/10 10 WU, Chien Shiung 1912-1997 1956: studied radioactive b-decay of polarized Co60 nuclei: Co60  Ni60 e- n She found an asymmetry: more electrons are emitted opposite to the nuclear spin direction than along it J J In the “real” world electrons are emitted opposite to the J direction In the “mirror” world electrons are emitted along the J direction Mirror world & real world are different L-R symmetry is violated. 中国科学技术大学大一新生《科学与社会》研讨课 《反物质世界的探索》 物理学院叶邦角教授主讲 版权所有， 严禁传播 叶邦角主讲