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This isotope is noted to have an uncharacteristically low half-life (40.5 seconds) with reference to the half-lives of its nearest OO neighbors, namely OO61Pm144 (360days), and OO61Pm140 (5.87 minutes), thus causing an irregularity in the OO stability profile line. WFPM ( talk) 19:49, 29 September 2011 (UTC)
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This list and all other sources I can find says that Promethium-147 decays to Samarium-147 by emitting a beta particle. The mass of Promethium-147 is 146.9151385 amu the mass of Samarium-147 is 146.9148979 amu. The difference between the two masses is 0.0002406 amu. A beta particle is nothing other than an electron, which has a rest mass of 5.48579909070×10−4 amu or 0.000548579909070 amu. That means the mass of the electron is greater than the mass difference between the two nuclei. This is impossible, isn't it? If the difference in masses were greater than the mass of the electron, that could be explained by it being carried away in the kinetic energy of the electron or in gamma rays. But you cannot gain mass without consuming energy. And where is this energy coming from? There is about a half electron mass missing (notice that I cut off the "uncertainty" in the brackets in each case and the order of magnitude of the problem is well outside the claimed measurement error). So... How does Promethium-147 emit an electron, create Samarium-147 and in the end there's mass to spare? Where is the mistake? An electron capture reaction can of course produce a mass defect that is smaller than an electron mass, but it cannot ever produce a net mass gain. To gain mass, there must be energy coming from somewhere. Where? Hobbitschuster ( talk) 14:59, 19 February 2022 (UTC)
I was unclear above - by "not ionized" I meant the whole system. Beta decay DOES produce ions. PianoDan ( talk) 17:48, 19 February 2022 (UTC)
According to page 100 of NUBASE2020, the possibility of positron emission among beta plus decay of 144Pm is <8×10-5%. which is extremely low considering the very large energy difference between 144Pm and 144Nd ( 2.3321 MeV). 129.104.241.214 ( talk) 00:45, 24 December 2023 (UTC)
According to [1], 146Pm and 147Pm should have a partial alpha decay half-life at the order of 1018 years and 1022 years. 129.104.241.214 ( talk) 11:28, 27 January 2024 (UTC)