Role of the Δ Resonance in the Population of a Four-Nucleon State in the Fe 56 → Fe 54 Reaction at Relativistic Energies
2016
The 54Fe nucleus was populated from a 56Fe beam impinging on a Be target with an energy of
E=A ¼ 500 MeV. The internal decay via γ-ray emission of the 10þ metastable state was observed. As the
structure of this isomeric state has to involve at least four unpaired nucleons, it cannot be populated in a
simple two-neutron removal reaction from the 56Fe ground state. The isomeric state was produced in the
low-momentum (-energy) tail of the parallel momentum (energy) distribution of 54Fe, suggesting that it was
populated via the decay of the Δ0 resonance into a proton. This process allows the population of fournucleon
states, such as the observed isomer. Therefore, it is concluded that the observation of this 10þ
metastable state in 54Fe is a consequence of the quark structure of the nucleons.
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