Role of the Δ Resonance in the Population of a Four-Nucleon State in the $^{56}$Fe → $^{54} $Fe Reaction at Relativistic Energies

Abstract : 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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Submitted on : Thursday, November 24, 2016 - 9:00:18 AM
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Zs. Podolyák, M. Shand, N. Lalović, J. Gerl, D. Rudolph, et al.. Role of the Δ Resonance in the Population of a Four-Nucleon State in the $^{56}$Fe → $^{54} $Fe Reaction at Relativistic Energies. Physical Review Letters, American Physical Society, 2016, 117 (22), ⟨10.1103/PhysRevLett.117.222302⟩. ⟨in2p3-01401953⟩

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