Exotic Cluster Shapes in Neutron-Rich Be and C Isotopes

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It is summarized that the linear-chain structure of ^16C((3/2^-_π)^2(1/2^-_σ)^2) with 3α core is the only case to have the simultaneous stabilities for the breathing-like break up path and for the bending-like path among ^12C, ^14C and ^16C. Other configurations, such as ^14C((3/2^-_π)^2) and ^16C((3/2^-_π)^2(1/2^-_π)^2) are stable against the breathing-like path but not stable against the bending-like path. A combination of the π- and the σ-orbits occupied by four neutrons plays doubly important roles to make a deep energy pocket for breathing-like path and to prevent the bending-like free motion of the system. The band head energy is calculated to be around 25 MeV in excitation, and is expected to form a rotational band with an energy slope of (h^2)/(2I) = 150 keV. The equilateral-triangular shape of 3α surrounded by valence neutrons is suggested for ^14C based on a microscopic cluster model. It is found that the attractive interaction between a valence neutron and a 3α particle stabilizes the rotational band structure built on top of the 3^- band head with an equilateral-triangular symmetry. The 3^-, 4^- and 5^- members of this rotational band appear around the ^10Be+α threshold, and these calculated states correspond to the experimentally observed 3^- state (9.80 MeV) and 4^- state (11.67 MeV). A positive-parity rotational band (0^+, 2^+, 4^+) also arises around this threshold energy, and these results suggest that the picture of inversion doublet structure work also in neutron-rich nuclei.
理論物理学刊行会の論文
2002-12-26

Exotic Cluster Shapes in Neutron-Rich Be and C Isotopes

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