The d + N systems are studied in a three-body model, using phenomenological N-N interactions. The scattering matrices are calculated by using the Kohn-Hulthén variational method. Then, they are analytically continued to complex energies and their singularities are localized. We find a virtual state at E = −1.66 MeV in 3 H and a pair of states at E = (−0.42 ± i0.52) MeV in 3 He relative to the d + N thresholds, respectively. In addition, we discuss some general aspects and problems of virtual states which may be useful also in the study of other systems, like 10 Li. PACS number(s): 21.45.+v, 24.30.Gd, 27.10.+h
Differential cross sections of the reaction 4 He(t,n) 6 Li, including some data of the first and second excited states of 6 Li, were measured and compared with an R-matrix analysis of previous data in the 7 Li system. Excellent agreement is observed for the angular distribution at the 0.24-MeV resonance of n-6 Li, and the shape of the angular distribution for 4 Hs(t,n,) 6 Li at 12.9 MeV is predicted qualitatively by the R-matrix analysis. However, for neutron energies greater than 0.5 MeV for 6 Li(n,t)*He the zero-degree excitation function is consistently lower (about 30%) in the R-matrix analysis.
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