Abstract
Abstract The number conservation law in the odd-particle number random-phase approximation (oRPA) and its extension (EoRPA) is studied by applying them to a pairing model and 16O. It is found in the application to 16O that the number conservation law is not fulfilled in oRPA or EoRPA and that it is drastically improved in EoRPA due to the inclusion of ground-state correlation effects. PACS numbers: 21.60.Jz
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