Where is the neutron drip line? How do atomic nuclei behave near the neutron drip line and beyond? With such fundamental questions in mind, I present the recent experimental studies near the neutron drip line and beyond using Coulomb and nuclear breakup reactions at about 200-250 MeV/nucleon at RIBF at RIKEN. Nuclei near the neutron drip line show characteristic structures due to the weakly-binding and large difference between neutron and proton Fermi energies. Key aspects are the shell evolution, deformation, and the strong nn correlations called dineutron revealed in such nuclei. In this seminar, I will present experimental results on the nuclei near/beyond the neutron drip line from B to Mg isotopes. The topics I’m going to talk include Borromean 2n halo nuclei 19B, and 22C[1], deformation driven halo nuclei, 29,31Ne[2-4] and 37Mg[5]. I will also show experimental studies of oxygen isotopes, 25-28O beyond the neutron drip line. In particular, I’ll focus on 26O, which has been found to have extremely small decay energy with respect to the two neutron emission [6], and thus may have strong nn correlation. Finally, I will provide perspectives on experimental studies along the neutron drip line and beyond.

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[5] N.Kobayashi, T.Nakamura, Y.Kondo et al., Phys. Rev. Lett. 112, 242501 (2014).
[6] Y. Kondo, T.Nakamura et al., Phys. Rev. Lett. 116, 102503 (2016).