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14—15.
TRANSMUTATÏON OF
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LÏTHÏUM
323
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14—15.
The Transmuta‘tion of Lithium by Proteus. In 1932,
Cockroft and Walton20 succeeded for the rst time in accomplish—…
ing a transmutation by the use of particles which had been accel—..
”
erated to a high velocity. It had just been shown by wave—nie—
chanics, that charged particles can enter a nucleus, not only when
they have energies equal to or greater than that at the top of the
potential barrier (gure 12—8), but also through the potential wall.
In other words, a particle With energy less than that at the top of
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