The lack of $p$-wave strength in a recent measurement of the low-energy ${}^7$Li(n,${\gamma }_0{)}^8$Li cross section, as compared with significant strength found in the ${}^7$Li(p,${\gamma }_0{)}^8$Be reaction, may be attributed to the qualitatively different low-energy behaviors of penetration factors for neutron and charged-particle channels.

• Received 3 September 1996

DOI:https://doi.org/10.1103/PhysRevC.55.535