From the results so far obtained it is difficult to avoid the conclusion that the long-range atoms arising from collision of alpha particles with nitrogen are not nitrogen atoms but probably atoms of hydrogen, or atoms of mass 2. If this be the case, we must conclude that the nitrogen atom is disintegrated under the intense forces developed in a close collision with a swift alpha particle, and that the hydrogen atom which is liberated formed a constituent part of the nitrogen nucleus.

It was almost as incredible as if you fired a 15-inch shell at a piece of tissue paper and it came back and hit you.

[From uranium] there are present at least two distinct types of radiation one that is very readily absorbed, which will be termed for convenience the α radiation, and the other of a more penetrative character, which will be termed the β radiation.

Gentlemen, now you will see that now you see nothing. And why you see nothing you will see presently.

I congratulate you both on a fine piece of work which I am sure will ultimately prove of importance. I am personally very much interested in your results... In the past I have tried a number of experiments... but without any success.

Should a young scientist working with me come to me after two years of such work and ask me what to do next, I would advise him to get out of science. After two years of work, if a man does not know what to do next, he will never make a real scientist.

The more physics you have the less engineering you need.