科研之友
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摘要
We study the ground and excited resonance states of O-26 with a three-body model of O-24 + n + n taking into account the coupling to the continuum. To this end, we use the new experimental data for the invariant mass spectroscopy of the unbound O-25 and O-26 nuclei, and present an update of three-body model calculations for the two-neutron decay of the O-26 nucleus. With the new model inputs determined with the ground-state decay of O-26, we discuss the dineutron correlations and a halo nature of this nucleus, as well as the structure of the excited states. For the energy of the 2(+) state, we achieve an excellent agreement with the experimental data with this calculation. We show that the 2(+) state consists predominantly of the (d(3/2))(2) configuration, for which the pairing interaction between the valence neutrons slightly decreases its energy from the unperturbed one. We also discuss the structure of excited 0(+) states of the O-26 nucleus. In particular, we show the existence of an excited 0(+) state at 3.38 MeV, which is mainly composed of the (f(7/2))(2) configuration.
- 出版日期2016-3-24
- 单位RIKEN; 中国科学院国家天文台
