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Into what?

Nevermore
in Chemistry

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Another thread mentioned that cobalt in a magnetic field beta decays. What does it decay into?

Depends on which isotope you have. Co-59 is the only stable isotope. Co isotopes that have fewer neutrons tend to undergo electron capture to an isotope of Fe (I didn't check all of the possibilities; some of the isotopes could possibly beta-plus decay instead of electron capture, but the ones I looked at were all EC), while those with more neutrons will beta-minus decay to Ni.

 

(The magnetic field has nothing to do with inducing the decay, only the spin alignment of the electron that is emitted. Co in no magnetic field will still decay)

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