Dineutron formation and breaking in 8He
Abstract
We discuss the correlation of the spin-singlet two-neutron pair, the dineutron correlation, in the ground and excited 0+ states of 8He by using a method to describe the dineutron correlation in neutron-rich nuclei, the dineutron condensate wave function. The shell-model configuration and the dineutron configuration compete with each other in the ground state of 8He. We compare the ground state structure of 8He with that of 6He and suggest that the dineutron correlation is weaker in the ground state of 8He than 6He. We also suggest the possibility of the dineutron condensation in an excited 0+ state of 8He. In addition, we investigate the formation mechanism of the dineutron condensation in 8He by using a newly developed framework, α and dineutron condensate wave function, and conclude that the attraction from the core is essential for the formation of the dineutron condensation.
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