Structure ofHe7by proton removal fromLi8with the (d,3He) reaction
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Abstract
We report on a study of the structure of the unbound nucleus $^{7}\mathrm{He}$ utilizing the proton-removal reaction ${}^{2}\mathrm{H}({}^{8}\mathrm{Li},{}^{3}\mathrm{He}){}^{7}\mathrm{He}$. Combining the present results with those of our prior measurements of the neutron-adding reaction ${}^{2}\mathrm{H}({}^{6}\mathrm{He},p){}^{7}\mathrm{He}$, a consistent picture emerges for the low-lying excitations in $^{7}\mathrm{He}$. Specifically, the negative-parity sequence of resonances, in order of excitation energies, is consistent with $3/{2}^{\ensuremath{-}},1/{2}^{\ensuremath{-}}$, and $5/{2}^{\ensuremath{-}}$. The stable-beam reactions ${}^{2}\mathrm{H}({}^{7}\mathrm{Li},t){}^{6}\mathrm{Li}$ and ${}^{2}\mathrm{H}({}^{7}\mathrm{Li},{}^{3}\mathrm{He}){}^{6}\mathrm{He}$ were also measured. The results are compared with the predictions of nuclear structure models, including those of ab initio quantum Monte Carlo calculations.
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