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追。但是二战的爆发使得这些国家的核武器研究计划或者被迫搁浅,或者进展缓慢。惟有美国,其本土远离战场。独占地理条件的优势,并拥有巨大的财力,再加上流亡美国的德国科学家的帮助,最终在核武器研制的竞赛中异军突起,取得了胜利。美国对核武器研制工作的关注,首先要归功于为逃避战乱而迁到美国的欧洲科学家。他们亲身经历希特勒的残暴统冶,对德国抢先研制原子弹的前景忧心忡忡,急切希望美国成为研制原子弹的先驱。在匈牙利物理学家西拉德、泰勒等人的劝说下,爱因斯坦写信给美国总统罗斯福,指出利用原子核的裂变反应,可制造出比普通炸弹威力大1000倍的原子弹,并警告说希特勒正在做这件事,建议美国政府尽早资助并加速研制原子弹。
chase. However, the outbreak of World War II made nuclear weapons research programs in these countries either stranded or slow-moving. Only the United States, its homeland away from the battlefield. The advantage of monopolizing the geographical conditions and having enormous financial resources, together with the help of German scientists in exile in the United States, culminated in the sudden emergence and victory of the nuclear weapons research and development competition. The U.S. concern over the development of nuclear weapons must first be attributed to the European scientists who moved to the United States to escape the war. They personally experienced Hitler’s brutal rule and were worried about Germany’s prospect of preemptively developing the atomic bomb. She was eager to see the United States become a pioneer in the development of the atomic bomb. Under the persuasion of Hungarian physicists Silad and Taylor, Einstein wrote to U.S. President Roosevelt pointing out that using nuclear fission reactions, atomic bombs could be manufactured 1,000 times more powerful than ordinary bombs and warned Hitler This is being done and suggested that the U.S. government fund as soon as possible and speed up the development of the atomic bomb.