An investigation of experimental data concerning the $\mathrm{Li}(p, n)$ reaction indicates that the resonance at 2.25-Mev proton energy is due to the influence of a spin 3, isotopic spin 1, even parity level of ${\mathrm{Be}}^8$, 19.2 Mev above the ground state, and that the background reaction intensity is predominantly the result of a spin-1 state of odd parity, and a spin-2 state of odd parity and isotopic spin 0. Cross sections, angular distributions, and neutron polarizations calculated on this basis are in good agreement with previous experimental measurements of these quantities.

The neutron and proton widths of the isotropic spin-1 state in ${\mathrm{Be}}^8$ are related to the neutron width of the corresponding isotopic-spin-1 state of ${\mathrm{Li}}^8$, 2.3 Mev above the ground state, in a manner consistent with the transition probability relationships expected of a nuclear isotopic spin multiplet.

• Received 30 July 1954

DOI:https://doi.org/10.1103/PhysRev.96.709