Nucleon-Pair Shell Model within a Symmetry Broken Basis

The nucleon-pair shell model (NPSM) within the framework of a broken symmetry basis is studied. results demonstrate validity such scheme, which in turn leads to significant reduction dimensionality multi-pair configuration space. Specifically, case an axially-deformed basis, yield satisfactory description low-lying spectrum, even without need for applying projection procedure. In triaxially-deformed result variation after angular momentum suggest potential using NPSM find exact solutions semi-magic system.