Relative energy spectrum of the ⁶He + n system, showing on the left a newly observed ⁷He excited-state resonance at I = 1/2^?. This state is interpreted to be a neutron in a p_1/2 orbital coupled to the ⁶He ground state. The experimentally determined position of this resonance is in reasonable agreement with recent quantum Monte Carlo calculations of the ⁷He system. The energies shown are in MeV.

From the article:

Evidence for a New Low-Lying Resonance State in ${}_{}{}^7{}_{}{}^{}He$
M. Meister et al.
Phys. Rev. Lett. 88, 102501 (2002)

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