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The $^8$Li($n,\gamma$)$^9$Li reaction plays an important role in severalastrophysics scenarios. It cannot be measured directly and indirect experimentshave so far provided only cross section limits. Theoretical predictions differby an order of magnitude. In this work we study the properties of $^9$Li boundstates and low-lying resonances and calculate the $^8$Li($n,\gamma$)$^9$Licross section within the no-core shell model with continuum (NCSMC) with chiralnucleon-nucleon and three-nucleon interactions as the only input. The NCSMC isan ab initio method applicable to light nuclei that provides a unifieddescription of bound and scattering states well suited to calculate low-energynuclear scattering and reactions. Our calculations reproduce the experimentallyknown bound states as well as the lowest $5/2^-$ resonance of $^9$Li. Wepredict a $3/2^-$ spin-parity assignment for the resonance observed at 5.38MeV. In addition to the a very narrow $7/2^-$ resonance correspondingpresumably to the experimental 6.43 MeV state, we find several other broadlow-lying resonances. Our calculated $^8$Li($n,\gamma$)$^9$Li cross section iswithin the limits derived from the 1998 National Superconducting CyclotronLaboratory Coulomb-dissociation experiment [Phys. Rev. C {\bf 57}, 959 (1998)].However, it is higher than cross sections obtained in recent phenomenologicalstudies. It is dominated by a direct E1 capture to the ground state with aresonant contribution at $\sim0.2$ MeV due to E2/M1 radiation enhanced by the$5/2^-$ resonance.

Microscopic investigation of the $^8$Li($n, \gamma$)$^9$Li reaction