Talk:Isotopes of europium

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Low Half-life values of OO63Eu144 and OO63Eu140

The reported half-lives do not agree with the half-life trend line of the rest of the 63Eu Europium OO type isotopes.WFPM (talk) 23:42, 21 April 2013 (UTC)[reply]

How would ¹⁵³
Eu decay to a much less stable isotope, ¹⁴⁹
Pm?

Because ¹⁴⁹
Pm is way too unstable, so shouldn't ¹⁵³
Eu be stable too? 80.98.179.160 (talk) 07:06, 26 March 2018 (UTC)[reply]

This is pretty normal: the obvious example is that ²³⁸U (half-life 4.468 × 10⁹ years) decays to ²³⁴Th (half-life 24.1 days). The important thing is that the system of ¹⁴⁹Pm plus an alpha particle is a lower-energy arrangement of 63 protons and 90 neutrons than a single ¹⁵³Eu nucleus (just look at the binding energies), and so the decay is energetically allowed. Of course, it is kinetically hindered for other reasons. The beta-instability of ¹⁴⁹Pm has nothing to do with it. Double sharp (talk) 07:15, 26 March 2018 (UTC)[reply]

Low Half-life values of OO63Eu144 and OO63Eu140

How would 153Eu decay to a much less stable isotope, 149Pm?

How would ¹⁵³
Eu decay to a much less stable isotope, ¹⁴⁹
Pm?