Five-body resonances of 8He using the complex scaling method

Abstract

The 0+ states of 8He are studied in a five-body 4He+n+n+n+n cluster model. Many-body resonances are treated on the correct boundary condition as Gamow states using the complex scaling method. The 0+_2 state of 8He is predicted as a five-body resonance in the excitation energy of 6.3 MeV with a width of 3.2 MeV, which mainly has a (p_{3/2})^2(p_{1/2})^2 configuration. In this state, number of the 0+ neuron pair shows almost two, which is different from the ground state having a large amount of the 2+ pair component. The monopole transition of 8He from the ground state into the five-body unbound states is also evaluated. It is found that the 7He+n component mostly exhausts the strength, while the 0+_2 contribution is negligible. The final states are dominated by 6He+n+n, not 4He+n+n+n+n. The results indicate the sequential breakup process of 8He to 7He+n to 6He+n+n by the monopole excitation.

6 pages, 6 figures, table I is updated for the experimental values

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• Five-body resonances of 8C using the complex scaling method
• Precise comparison of the Gaussian expansion method and the Gamow shell model
• Comprehensive application of a coupled-channel complex scaling method to the KbarN-piY system
• Interplay between the 0+_2 resonance and the nonresonant continuum of the drip-line two-neutron halo nucleus 22C
• Four-body resonances of 7B using the complex scaling method
• Possible interpretation of the complex expectation values associated with resonances
• Five-body resonances in ${}^8$He and ${}^8$C using the complex scaling method
• Mirror symmetry breaking in He isotopes and their mirror nuclei
• Structure of neutron-rich He $\Lambda$ hypernuclei using the cluster orbital shell model
• Modeling the electric dipole strength of neutron-rich ${}^8$He: Prediction of multineutron collective excitations
• Soft dipole resonance in neutron-rich ${}^8$He
• Dineutron clusters in ${}^7$He and ${}^8$He structure
• Radii of proton emitters
• Resonances and continuum states of drip-line nuclei using the complex scaling method
• Physics of many-body resonances with complex scaling and applications to light unstable nuclei