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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "In nuclear physics, beta decay (β-decay) is a type of radioactive decay in which a proton is transformed into a neutron, or vice versa, inside an atomic nucleus. This process allows the atom to move closer to the optimal ratio of protons and neutrons. As a result of this transformation, the nucleus emits a detectable beta particle, which is an electron or positron.Beta decay is mediated by the weak force. There are two types of beta decay, known as beta minus and beta plus." ] ,
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