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1955年10月19日,美國加里福尼亞大学原子研究所所長劳倫斯宣布:这个研究所的工作人員在長期研究后,發現了一种新的基本粒子。这种粒子叫做反質子或負質子。反質子是这样發現的:將質子在同步穩相加速器中加速到63億电子伏特,然后用它來轟击安置在加速器中的銅靶。結果產生一对重的粒子一个是質子,另一个便是反質子。反質子在真空中是穩定的,并不自行分裂。但是当它与質子相遇的时候,这一对質子就轉变为一些介子而消失了。有趣的是,1955年初,在意大利罗馬大学的实驗室和美國麻省理工学院的实驗室中,几乎是同时發現,宇宙线作用在照相乳膠上的踪跡中,有的是反質子所造成的。反質子的質量与質子的質量相等(?),而电荷相反。
On October 19th, 1955, Lawrence, the director of the Institute of Atomic Research at the University of California, announced that the staff of the Institute had discovered a new type of basic particles after long-term research. The particles are called antiprotons or negative protons. Antiprotons were discovered by accelerating protons to 6.3 billion electron volts in a synchrophasic accelerator and then using it to bombard copper targets placed in accelerators. The result is a pair of heavy particles, one proton and the other antiproton. Antiprotons are stable in a vacuum and do not divide themselves. But when it meets with protons, the pair of protons turn into mesons and disappears. Interestingly, at the beginning of 1955, in the laboratory of the University of Rome, Italy, and the laboratory of the Massachusetts Institute of Technology, it was found almost simultaneously that the cosmic rays acted on the photographic latex, and some were caused by antiprotons. The mass of the antiproton is equal to the mass of the proton (?), and the charge is opposite.