C.D.Anderson."The positive electron",Phys. Re,43,491(1933). MARCH 15,1933 PHYSICAL REVIEW VOLUME 43 The Positive Electron CARL D.ANDERSON,California Institute of Technology,Pasadena,California (Received February 28,1933) Out of a group of 1300 photographs of cosmic-ray tracks curvatures and ionizations produced require the mass to be in a vertical Wilson chamber 15 tracks were of positive less than twenty times the electron mass.These particles particles which could not have a mass as great as that of will be called positrons.Because they occur in groups the proton.From an examination of the energy-loss and associated with other tracks it is concluded that they must ionization produced it is coneluded that the charge is less be secondary particles ejected from atomie nuclei. than twice,and is probably exactly equal to,that of the Editor proton.If these particles carry unit positive charge the N August 2,1932,during the course of electrons happened to produce two tracks so photographing cosmic-ray tracks produced placed as to give the impression of a single in a vertical Wilson chamber (magnetic field of particle shooting through the lead plate.This 1e000 C10)0 PDF文件使用"pdfFactory”试用版本创建ww.fineprint.cn
C. D. Anderson. "The positive electron" , Phys. Rev., 43, 491 (1933). PDF 文件使用 "pdfFactory" 试用版本创建 ÿwww.fineprint.cn
Significance of Positron Discovery The positron discovery was the first evidence for ANTIMATTER Carl Anderson That is,the positron has award Nobel essentially all the same prize for the properties as an electron, discovery of the except,it's charge is positron positive Carl Anderson 1905-1991 If an electron and a positron collide,they ANNIHILATE and form pure energy (EM Radiation). This conversion of matter into energy is a common event in the life of physicists that studies these little rascals... PDF文件使用"pdfFactory”试用版本创建w.fineprint.cn
Significance of Positron Discovery The positron discovery was the first evidence for ANTIMATTER. That is, the positron has essentially all the same properties as an electron, except, it’s charge is positive ! If an electron and a positron collide, they ANNIHILATE and form pure energy (EM Radiation). This conversion of matter into energy is a common event in the life of physicists that studies these little rascals… Carl Anderson award Nobel prize for the discovery of the positron Carl Anderson 1905-1991 PDF 文件使用 "pdfFactory" 试用版本创建 ÿÖwww.fineprint.cn
Example:Matter>Energy E=5 [MeV] AAAEM人N E=5 [MeV] MW9KW1514 An electron and positron,each with energy 5 [MeV]collide, and annihilate into pure energy in the form of 2 photons. Each photon carries away of the total energy available. PDF文件使用"pdfFactory”试用版本创建w.fineprint.cn
Example: Matter à Energy e + e - E=5 [MeV] e + e - e + e - e - e%*+ &* E=5 [MeV] e - e + E=5 [MeV] E=5 [MeV] An electron and positron, each with energy 5 [MeV] collide, and annihilate into pure energy in the form of 2 photons. Each photon carries away ½ of the total energy available. PDF 文件使用 "pdfFactory" 试用版本创建 3www.fineprint.cn 3
科学史上的错案 赵忠尧先生 是发现正电子的第一人 PDF文件使用"pdfFactory”试用版本创建ffineprint.cn
赵忠尧先生 是发现正电子的第一人 科学史上的错案 PDF 文件使用 "pdfFactory" 试用版本创建 f www.fineprint.cn ÿÿf
(1902.6.27—1998.5.28) 近代物理系的创建者和首任系主任 PDF文件使用"pdfFactory”试用版本创建ww.fineprint.cn
(1902.6.27—1998.5.28) 近代物理系的创建者和首任系主任 PDF 文件使用 "pdfFactory" 试用版本创建 ÿwww.fineprint.cn