@Article{Podolyak2016,
author="Podolyak, Z.",
title="Role of the Delta Resonance in the Population of a Four-Nucleon State in the Fe-56 -> Fe-54 Reaction at Relativistic Energies",
journal="Physical Review Letters",
year="2016",
publisher="Amer Physical Soc",
volume="117",
number="22",
pages="222302--6pp",
abstract="The Fe-54 nucleus was populated from a Fe-56 beam impinging on a Be target with an energy of E/A = 500 MeV. The internal decay via gamma-ray emission of the 10(+) 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 Fe-56 ground state. The isomeric state was produced in the low-momentum (-energy) tail of the parallel momentum (energy) distribution of Fe-54, suggesting that it was populated via the decay of the Delta(0) 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 10(+) metastable state in Fe-54 is a consequence of the quark structure of the nucleons.",
optnote="WOS:000388630000009",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2875), last updated on Thu, 22 Dec 2016 15:48:35 +0000",
issn="0031-9007",
doi="10.1103/PhysRevLett.117.222302",
opturl="https://doi.org/10.1103/PhysRevLett.117.222302",
language="English"
}