Unmatter entities inside nuclei, predicted by the brightsen nucleon cluster model

Applying the R. A. Brightsen Nucleon Cluster Model of the atomic nucleus we discuss how stable and unstable unmatter entities (the conjugations of matter and antimatter) may be formed as clusters inside a nucleus. The model supports a hypothesis that antimatter nucleon clusters are present as a parton (sensu Feynman) superposition within the spatial confinement of the proton (¹H¹), the neutron, and the deuteron (¹H²). If model predictions can be confirmed both mathematically and experimentally, a new physics is suggested. A proposed experiment is connected to orthopositronium annihilation anomalies, which, being related to one of known unmatter entity, orthopositronium (built on electron and positron), opens a way to expand the Standard Model.