Abstract:
The structure of Be and C isotopes are investigated based on the molecular-orbit (MO) model. The low-lying states are characterized by several configurations of valence neutrons, which are constructed as combinations of basic orbits. In 10Be, all of the observed positive-parity bands and the negative-parity bands are described within the model. The second 0+ state of 10Be has a large α-α cluster structure, and this is characterized by a (1/2+ σ)2 configuration. An enlargement of the α-α distance due to two-valence neutrons along the α-α axis makes their wave function smooth and reduces the kinetic energy drastically. Furthermore, the contribution of the spin-orbit interaction due to coupling between the S z = 0 and the S z = 1 configurations, is important. In the ground state of 12Be, the calculated energy exhibits similar characteristics, that the remarkable α clustering and the contribution of the spin-orbit interaction make the binding of the state with (3/2- π)2(1/2+ σ)2 configuration properly stronger in comparison with the closed p-shell (3/2- π)2(1/2- π)2 configuration. This is related to the breaking of the N = 8 (closed p-shell) neutron magic number. Also, the molecule-like structure of the C isotopes is investigated using a microscopic α+α+α+n+n+ . . . model. The combination of the valence neutrons in the π- and the σ-orbit is promising to stabilize the linear-chain state against the breathing and bending modes, and it is found that the excited states of 16C are the most promising candidates for such structure.
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Received: 1 May 2001 / Accepted: 4 December 2001
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Itagaki, N., Okabe, S., Ikeda, K. et al. Molecular-orbital structure in neutron-rich Be and C isotopes. Eur Phys J A 13, 43–47 (2002). https://doi.org/10.1140/epja1339-07
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DOI: https://doi.org/10.1140/epja1339-07