Re: Einstein/Roosevelt letter.

"Geoffrey Sinclair" <gsinclairnb@xxxxxxxxxxxxx> wrote in message
news:49c63f39$0$5639$5a62ac22@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Correction time,

There are something like 15 isotopes of Uranium, U227 to 240,
then comes the 15 isotopes of Neptunium Np 229 to 241 which
is the next element, then comes the 16 isotopes of Plutonium,
Pu232 to 246. This is counting isomers, that is excited nuclear
states that eventually decay without changing the number of protons
or neutrons.

Isomers can decay or change in a way that changes the number
of protons and/or neutrons in the nucleus, it depends on the isomer.

Geoffrey Sinclair
Remove the nb for email.

.

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