Talk:Isotopes of europium

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)

How would decay to a much less stable isotope, ?
Because is way too unstable, so shouldn't  be stable too? 80.98.179.160 (talk) 07:06, 26 March 2018 (UTC)
 * 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)
 * It may be worth noted that 149Pm also has a greater alpha decay energy (1.135 MeV) than that of 153Eu (0.273 MeV). Roughly speaking, 149Pm havs 3 more protons than the alpha-stable nuclide 146Ce, while 153Eu has only 2 more protons than the alpha-stable 151Pm.
 * In the example of 238U-234Th this is not the case (4.270 MeV for 238U vs. 3.672 MeV for 234Th). Of course lower alpha decay energy does not necessarily mean longer alpha decay partial half-life: 231Th has an alpha decay energy of 4.213 MeV and partial half-life 2.91×107 years, compared to 4.678 MeV and 7.04×108 years for 235U. 129.104.241.214 (talk) 00:55, 24 November 2023 (UTC)

Because 153Eu have a larger mass than a combination of 149Pm and 4He (atomic mass of 153Eu is 152.9212303, atomic mass of 149Pm is 148.918334, atomis of 4He is 4.002602) but the kenetic energy of alpha particle in this case is quite small meaning the half-life is quite largeCristiano Toàn (talk) 08:54, 16 May 2022 (UTC)


 * At the order of 10140 year as stated in . 129.104.241.214 (talk) 06:25, 28 October 2023 (UTC)

Theoretical decay chain of 153Eu:153Eu => 149Pm => 149Sm => 145Nd => 141Ce => 141Pm (the last nuclide contains 82 neutrons, magic number). Both 149Sm and 145Nd has theoretical half-life shorter than 128Te's half-life

Could 150Eu possibly undergo β- decay to 150Gd?
This is energetically allowed, and also we observe a 89% probability of the β- decay of 150mEu. However, just like to case of 98Tc whose decay to 98Mo is unknown, do we know that it is impossible, or it's just we haven't observed that mode of decay? 129.104.241.214 (talk) 00:26, 11 October 2023 (UTC) Cristiano Toàn (talk) 14:37, 11 February 2024 (UTC). Cristiano Toàn (talk) 14:37, 11 February 2024 (UTC)Theoretical decay chain of 153Eu:153Eu => 149Pm => 149Sm => 145Nd => 141Ce => 141Pm (the last nuclide contains 82 neutrons, magic number). Both 149Sm and 145Nd has theoretical half-life shorter than 128Te's half-life

Possible alpha decay of 144,145,146,149Eu
According to, 146Eu (N = 83) and 149Eu (N = 86) should respectively have a partial alpha decay half-life of at least 1022 years and 109 years. 149Eu has similar alpha decay energy as its decay product (2.40 MeV for 149Eu and 2.32 MeV for 145Pm), and 146Eu has lower decay energy than 151Eu (1.60 MeV vs. 1.96 MeV).

As for 144Eu (N = 81) and 145Eu (N = 82), they have respectively an alpha decay energy of 0.16 MeV and 0.10 MeV, which are much too low, so their partial alpha decay half-lives should be long beyond imagination. 129.104.241.214 (talk) 06:14, 24 October 2023 (UTC)

disagreement between beginning and table
Beginning of the article states that 152m2Eu has a half-life of 96 min, but the table states that it's false and that it's actually 152m5Eu with a half-life of 96 min. 24.115.255.37 (talk) 20:49, 19 May 2024 (UTC)


 * Fixed, as given in NUBASE2020; thanks for catching this. Complex / Rational  21:02, 19 May 2024 (UTC)
 * you're welcome. 24.115.255.37 (talk) 22:25, 19 May 2024 (UTC)