Three-body resonances in He-6, Li-6, and Be-6, and the soft dipole mode problem of neutron halo nuclei
Abstract
Using the complex scaling method, the low-lying three-body resonances of 6He, 6Li, and 6Be are investigated in a parameter-free microscopic three-cluster model. In 6He a 2+, in 6Li a 2+ and a 1+, and in 6Be the 0+ ground state and a 2+ excited state is found. The other experimentally known 2+ state of 6Li cannot be localized by our present method. We have found no indication for the existence of the predicted 1- soft dipole state in 6He. We argue that the sequential decay mode of 6He through the resonant states of its two-body subsystem can lead to peaks in the excitation function. This process can explain the experimental results in the case of 11Li, too. We propose an experimental analysis, which can decide between the soft dipole mode and the sequential decay mode.
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