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High precision studies of soft dipole mode in two-neutron halo nuclei: 6^{6}He case

Abstract

The "soft dipole" E1 strength function is calculated for the transition from the 6^{6}He 0+0^+ ground state to the 1−1^- continuum 4^{4}He+nn+nn. The calculations were performed within the hyperspherical harmonics formalism. The sensitivity of the results to the 6^{6}He ground state structure and to final state interactions, are analyzed. The large-basis calculations show the reliably converged results for soft dipole strength function and for momentum correlations of the ^{6}\mbox{He} \rightarrow \, ^{4}He+nn+nn dissociation products. Transition mechanisms are analyzed based on the momentum correlations. The comparison with experimental data is provided.Comment: 16 pages, 17 figure

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