Elastic Scattering of Neutrons by ${Li}^{6}$ and ${Li}^{7}$

Differential cross sections for elastic scattering of neutrons by

{Li}^{6}

and

{Li}^{7}

have been measured in the region of 200- to 600-kev incident energy. The results for

{Li}^{6}

confirm the assignment of

\frac{5}{2^{-}}

for the 7.46-Mev level in

{Li}^{7 *}

and indicate that the

s

-wave potential scattering has a statistical channel spin mixture and negative phase shift. Similarly in the case of

{Li}^{7}

, the 2.28-Mev level in

{Li}^{8 *}

is indeed

3^{+}

, the

s

-wave potential scattering has very nearly a statistical channel spin mixture, but the phase shift is positive.

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Elastic Scattering of Neutrons byLi6andLi7