Dr. Marvin Marshak, professor at the University of Minnesota, with a massive detector that searches for proton decay - the spontaneous conversion of matter to energy. Proton decay is a hypothetical form of radioactive decay. There is not yet any experimental evidence that proton decay occurs. Photo taken circa 1986. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Morgan, Hank |
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