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Beta-decay stable isobars
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<p>Beta-decay stable isobars are the set of <a href="/facts/Nuclides/97Ykvzr3">nuclides</a> which cannot undergo <a href="/facts/Beta_decay/vxTBlckp">beta decay</a>, that is, the transformation of a <a href="/facts/Neutron/oRCM1geb">neutron</a> to a <a href="/facts/Proton/clCjepXP">proton</a> or a proton to a neutron within the <a href="/facts/Atomic_nucleus/orpIm5Xl">nucleus</a>. A subset of these nuclides are also stable with regards to <a href="/facts/Double_beta_decay/ILmpbfqS">double beta decay</a> or theoretically higher simultaneous beta decay, as they have the lowest energy of all <a href="/facts/Isobar_(nuclide)/25ezJVsq">isobars</a> with the same <a href="/facts/Mass_number/VyBbJ1oI">mass number</a>. </p><p>This set of nuclides is also known as the line of beta stability, a term already in common use in 1965. This line lies along the bottom of the nuclear <a href="/facts/Valley_of_stability/hTr4dBSq">valley of stability</a>. </p>