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Structure and neutron decay of the unbound Beryllium isotopes 15,16Be

Abstract : Near the dripline, where the energy needed to remove one nucleon is low enough or even negative, neutron emission from neutron-rich nuclei is a characteristic phenomenon. Ground state two-neutron decays are a special case that may occur once we go beyond the dripline. The spectroscopy and neutron decay of the most neutron-rich isotopes of Beryllium 14Be, 15Be and especially 16Be have been investigated during different experimental campaigns at RIBF-RIKEN using the SAMURAI setup and the NEBULA neutron array. For the latter, the state-of-the-art MINOS target was added to the standard setup.Our experimental approach and a thorough treatment of multi-neutron events have made possible an extensive analysis on the three-body correlations in fragment+n+n decays from two-neutron unbound states. For the first time, the ground state and first excited state of 16Be have been unambiguously observed, and the correlation analyses show a clear direct neutron-pair emission from both states. In order to interpret the experimental distributions, the neutron-pair emission (nn) has been characterized from microscopic principles. A joint effort between experiment and theory has allowed a direct comparison to connect the experimental nn signal we observe with the three-body wave-function.
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Submitted on : Wednesday, March 25, 2020 - 11:47:18 AM
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Belen Monteagudo Godoy. Structure and neutron decay of the unbound Beryllium isotopes 15,16Be. Physics [physics]. Normandie Université, 2019. English. ⟨NNT : 2019NORMC254⟩. ⟨tel-02518505⟩



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