Scattering and reaction cross sections in the seven-nucleon system are calculated in a multiconfiguration resonating-group study which consists of t${+}^4$He, n${+}^6$Li, and n${+}^6$${\mathrm{Li}}^{\mathrm{*}}$ cluster configurations. The results show that the diffraction and interference features of the experimental angular distributions can be well explained, but that the calculated magnitudes of the differential cross sections are generally too large. In addition, it is found that the calculated total reaction cross sections for the t${+}^4$He and n${+}^6$Li channels are only 30–40 % of the measured values, indicating that, for a satisfactory explanation of all the important features of the seven-nucleon system, more cluster configurations must still be incorporated into the resonating-group formulation.

• Received 29 April 1988

DOI:https://doi.org/10.1103/PhysRevC.38.1531