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(Actually, it was wrong: it was off, really, by 1 percent, for a reason we hadn’t appreciated, which was only understood later by Nicola Cabibbo. So that 2 percent was not all experimental.)
Murray Gell-Ma
A good example of this was an experiment by Valentine Telegdi, in which he measured the number of electrons that go out in each direction when a neutron disintegrates. Our theory had predicted that the number should be the same in all directions, whereas Telegdi found that 11 percent more came out in one direction than the others. Telegdi was an excellent experimenter, and very careful. And once, when he was giving a talk somewhere, he referred to our theory and said, “The trouble with theorists is, they never pay attention to the experiments!”
Telegdi also sent us a letter, which wasn’t exactly scathing, but nevertheless showed he was convinced that our theory was wrong. At the end he wrote, “The F-C (Feynman—Gell-Ma
Murray says, “What should we do about this? You know, Telegdi’s pretty good.”
I say, “We just wait.”
Two days later there’s another letter from Telegdi. He’s a complete convert. He found out from our theory that he had disregarded the possibility that the proton recoiling from the neutron is not the same in all directions. He had assumed it was the same. By putting in corrections that our theory predicted instead of the ones he had been using, the results straightened out and were in complete agreement.
I knew that Telegdi was excellent, and it would be hard to go upstream against him. But I was convinced by that time that something must be wrong with his experiment, and that he would find it—he’s much better at finding it than we would be. That’s why I said we shouldn’t try to figure it out but just wait.
I went to Professor Bacher and told him about our success, and he said, “Yes, you come out and say that the neutron-proton coupling is V instead of T. Everybody used to think it was T. Where is the fundamental experiment that says it’s T? Why don’t you look at the early experiments and find out what was wrong with them?”
I went out and found the original article on the experiment that said the neutron-proton coupling is T, and I was shocked by something. I remembered reading that article once before (back in the days when I read every article in the Physical Review—it was small enough). And I remembered, when I saw this article again, looking at that curve and thinking, “That doesn’t prove anything!”
You see, it depended on one or two points at the very edge of the range of the data, and there’s a principle that a point on the edge of the range of the data—the last point—isn’t very good, because if it was, they’d have another point further along. And I had realized that the whole idea that neutron-proton coupling is T was based on the last point, which wasn’t very good, and therefore it’s not proved. I remember noticing that!
And when I became interested in beta decay, directly, I read all these reports by the “beta-decay experts,” which said it’s T. I never looked at the original data; I only read those reports, like a dope. Had I been a good physicist, when I thought of the original idea back at the Rochester Conference I would have immediately looked up “how strong do we know it’s T?”—that would have been the sensible thing to do. I would have recognized right away that I had already noticed it wasn’t satisfactorily proved.
Since then I never pay any attention to anything by “experts.” I calculate everything myself. When people said the quark theory was pretty good, I got two Ph. D.s, Fi
Thirteen Times
One time a science teacher from the local city college came around and asked me if I’d give a talk there. He offered me fifty dollars, but I told him I wasn’t worried about the money. “That’s the city college, right?”
“Yes.”
I thought about how much paperwork I usually had to get involved with when I deal with the government, so I laughed and said, “I’ll be glad to give the talk. There’s only one condition on the whole thing”—I pulled a number out of a hat and continued—”that I don’t have to sign my name more than thirteen times, and that includes the check!”
The guy laughs too. “Thirteen times! No problem.”
So then it starts. First I have to sign something that says I’m loyal to the government, or else I can’t talk in the city college. And I have to sign it double, OK? Then I have to sign some kind of release to the city—I can’t remember what. Pretty soon the numbers are begi
I have to sign that I was suitably employed as a professor—to ensure, of course, since it’s a city thing, that no jerk at the other end was hiring his wife or a friend to come and not even give the lecture. There were all kinds of things to ensure, and the signatures kept mounting.
Well, the guy who started out laughing got pretty nervous, but we just made it. I signed exactly twelve times. There was one more left for the check, so I went ahead and gave the talk.
A few days later the guy came around to give me the check, and he was really sweating. He couldn’t give me the money unless I signed a form saying I really gave the talk.
I said, “If I sign the form, I can’t sign the check. But you were there. You heard the talk; why don’t you sign it?”
“Look,” he said, “Isn’t this whole thing rather silly?”
“No. It was an arrangement we made in the begi
He said, “I’ve been working very hard, calling all around. I’ve been trying everything, and they tell me it’s impossible. You simply can’t get your money unless you sign the form.”
“It’s OK,” I said. “I’ve only signed twelve times, and I gave the talk. I don’t need the money.”
“But I have to do this to you.”
“It’s all right. We made a deal; don’t worry.”
The next day he called me up. “They can’t not give you the money! They’ve already earmarked the money and they’ve got it set aside, so they have to give it to you!”
“OK, if they have to give me the money, let them give me the money.”
“But you have to sign the form.”
“I won’t sign the form!”
They were stuck. There was no miscellaneous pot which was for money that this man deserves but won’t sign for.
Finally, it got straightened out. It took a long time, and it was very complicated—but I used the thirteenth signature to cash my check.