Category: Paper

  • N = 8 Shell Breaking in 12Be from a Single-Particle Perspective

    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…

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  • Direct Evidence for the πœˆβ’π‘‘5/2 Orbital in 69Ni: Implications for the 𝑁=40 Island of Inversion

    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 πœˆβ’π‘‘5/2 orbital, the quadrupole partner of πœˆβ’π‘”9/2, in driving deformation. However, experimental constraints on the location and properties of neutron orbitals in neutron-rich…

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  • Evolution of single-particle structure near the N = 20 island of inversion

    Evolution of single-particle structure near the N = 20 island of inversion The single-particle properties of 29Mg have been investigated via a measurement of the 28Mg(d,p)29Mg reaction, in inverse kinematics, using the ISOLDE Solenoidal Spectrometer. The negative-parity intruder states from the fp shell have been identified and used to benchmark modern shell-model calculations. The systematic…

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  • First Exploration of Neutron Shell Structure Below Lead and Beyond N=126

    The nuclei below lead but with more than 126 neutrons are crucial to an understanding of the astrophysical r-process in producing nuclei heavier than A ∼ 190. Despite their importance, the structure and properties of these nuclei remain experimentally untested as they are difficult to produce in nuclear reactions with stable beams. In a first…

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