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We discussed proton—neutron two-quasiparticle excitations and their electromagnetic and beta decays in Chap. 15. In Chap. 17 we introduced the pn-QTDA, the simplest configuration mixing scheme of these excitations. The vacuum of the pnQTDA is the BCS vacuum, and the solutions of the pn-QTDA satisfy a variational principle.1
KeywordsMatrix Element Beta Decay Transition Matrix Element Valence Space Double Commutator
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