Elastic 6He+ 4He data measured at E c.m.=11.6, 15.9, and 60.3 MeV have been analyzed within the coupled reaction channels (CRC) formalism, with the elastic-scattering and two-neutron (2n) transfer amplitudes coherently included. Contributions from the direct (one-step) and sequential (two-step) 2n-transfers were treated explicitly based on a realistic assumption for the 2n-transfer form factor. The oscillatory pattern observed in 4He( 6He, 6He) 4He angular distribution at low energies was found to be due to an interference between the elastic scattering and 2n-transfer amplitudes. Our CRC analysis shows consistently that the direct 2n-transfer strongly dominates over the sequential transfer and thus confirms the dominance of 2n- 4He configuration over the n- 5He one in the 6He wave function. This result suggests a strong clusterization of the two valence neutrons and allows, therefore, a reliable estimate for the di-neutron spectroscopic amplitude. © 2004 Elsevier B.V. All rights reserved.
Khoa, D. T., & Von Oertzen, W. (2004). Di-neutron elastic transfer in the 4He( 6He, 6He) 4He reaction. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 595(1–4), 193–201. https://doi.org/10.1016/j.physletb.2004.05.063