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Experimental observations of the low-lying states in 12Be and their accurate modeling play an essential role in understanding the disappearance of the N=8 magic number. Long-standing experimental ambiguities have been clarified using an one-neutron adding (d,p) reaction on 11Be using the ISOLDE Solenoidal Spectrometer at CERN’s HIE-ISOLDE facility. The single-particle energies of 1s1=2, 0d5=2, and…

Shape coexistence, a collective manifestation of nuclear structure, emerges from the underlying single-particle dynamics and is prominently observed in the region below 68Ni. Theoretical studies have emphasized the key role of the 𝜈⁢𝑑5/2 orbital, the quadrupole partner of 𝜈⁢𝑔9/2, in driving deformation. However, experimental constraints on the location and properties of neutron orbitals in neutron-rich…