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Den 30.06.2025 21:33, skrev guido wugi:Thank you for the examples, kindof reminding me of things I never assimilated in nuclear chemistry courses or whatever it was called at that time ;-)Op 30/06/2025 om 21:23 schreef Paul.B.Andersen:>>>
β− decay is when a neutron in the core changes to a proton
by emitting an electron.
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β+ decay is when a proton in the core changes to a neutron
by emitting a positron.
Or that particle transforms are time-reversible (within the limits of later and previous interactions) and that β- and β+ are time mirrors of each other?
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It is not time reversible in the sense that a β− decay can be
'undone' by a β+ decay so we get the same isotope back.
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Example of β− decay:
Carbon-14 with 6 protons and 8 neutrons decays into
Nitrogen-14 with 7 protons and 7 neutrons + electron and antineutrino
Nitrogen-14 is stable
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Example of β+ decay:
Carbon-10 with 6 protons and 4 neutrons decays into
Boron-10 with 5 protons and 5 neutrons + positron and neutrino
Boron-10 is stable
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Note that the decay tend to make the number of protons and neurons
(more) equal.
Isotopes with equal (or more balanced) number of protons and neutrons
tend to be stable.
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