Three-body resonances in [sup 6]He, [sup 6]Li, and [sup 6]Be, and the soft dipole mode problem of neutron halo nuclei
- W. K. Kellogg Radiation Laboratory, 106-38, California Institute of Technology, Pasadena, California 91125 (United States)
Using the complex scaling method, the low-lying three-body resonances of [sup 6]He, [sup 6]Li, and [sup 6]Be are investigated in a parameter-free microscopic three-cluster model. In [sup 6]He a 2[sup +], in [sup 6]Li a 2[sup +] and a 1[sup +], and in [sup 6]Be the 0[sup +] ground state and a 2[sup +] excited state are found. The other experimentally known 2[sup +] state of [sup 6]Li cannot be localized by our present method. We have found no indication for the existence of the predicted 1[sup [minus]] soft dipole state in [sup 6]He. We argue that the sequential decay mode of [sup 6]He 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 [sup 11]Li, too. We propose an experimental analysis, which can decide between the soft dipole mode and the sequential decay mode.
- OSTI ID:
- 7238910
- Journal Information:
- Physical Review, C (Nuclear Physics); (United States), Vol. 49:6; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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MILLISEC LIVING RADIOISOTOPES
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