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Mapping the Big Island of Deformation around N=20 and 28

Abstract : Magic numbers of nucleons, which appear as large energy gaps in the spherical nuclear shell model, have been known to erode and emerge in asymmetric nuclear systems. The evolution of this behaviour is studied in two regions at, and near, magic neutron numbers N=20 and N=28 in neutron-rich neon and aluminium nuclei. Collectivity and excited state structure is studied through in-beam gamma-ray spectroscopy of one- and two-nucleon knockout reactions, and inelastic scattering. Experiments were carried out at the RIKEN Nishina Center in Tokyo, Japan. Prompt gamma-rays were observed in the DALI2 detector and the nuclear structure of neutron-rich neon and aluminium isotopes were deduced. In addition, inclusive and exclusive cross sections to bound states from one- and two-proton knockout reactions, in combination with shell model calculations and reaction theory, extends systematic trends in the region. The two neutron-rich territories of N=20 and N=28 have been discussed as an extended island of deformation, joined-up through the magnesium isotopic chain. These observations enhance the mapping of this region and contribute to understanding the driving forces behind its formation.
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Submitted on : Monday, April 8, 2019 - 3:28:15 PM
Last modification on : Wednesday, September 16, 2020 - 4:10:27 PM


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  • HAL Id : tel-02090946, version 2



Ian Murray. Mapping the Big Island of Deformation around N=20 and 28. Nuclear Experiment [nucl-ex]. Université Paris-Saclay, 2018. English. ⟨NNT : 2018SACLS196⟩. ⟨tel-02090946v2⟩



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