6533b855fe1ef96bd12b0468
RESEARCH PRODUCT
Role of the Delta Resonance in the Population of a Four-Nucleon State in the 56Fe to 54Fe Reaction at Relativistic Energies
Zs PodolyakLj Harkness-brennanDs Judsonsubject
Nuclear TheoryNuclear Experimentdescription
The 54Fe nucleus was populated from a 56Fe beam impinging on a Be target with an energy of E/A=500MeV. The internal decay via γ-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 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 four-nucleon states, such as the observed isomer. Therefore, it is concluded that the observation of this 10+ metastable state in 54Fe is a consequence of the quark structure of the nucleons.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-11-25 |