Dineutron configurations in neutron-excess nuclei from the viewpoint of the diffraction model

Cross sections measured for the interactions of incident neutron-excess nuclei ⁶He and ¹¹Li with other nuclei are analyzed in terms of expressions obtained for relevant integrated cross sections within the diffraction approximation. The results of this analysis suggest that there exists a dineutron configuration in the ⁶He nucleus and that there is no such configuration in the ¹¹Li nucleus. On the basis of calculations performed for various observables, some new specific experiments are proposed for discovering dineutrons more reliably in nuclei having a neutron halo.