6533b7dbfe1ef96bd126fe18
RESEARCH PRODUCT
Role of the Δ Resonance in the Population of a Four-Nucleon State in the Fe56→Fe54 Reaction at Relativistic Energies
C. LouchartI. KojouharovG. De AngelisB. BruyneelA. MajJ. GerlW. KortenT. AlexanderD. S. JudsonM. D. SalsacL. J. Harkness-brennanM. ReeseS. PietriH. SchaffnerJ. J. Valiente DobonM. LabicheZena PatelDirk RudolphM. LettmannLuis SarmientoC. M. ShandA. PulliaP. H. ReganH. PaiZs. DombrádiJ. EberthA. GadeaR. M. Pérez-vidalP. DésesquellesHelmut WeickB. BirkenbachA. JungclausD. MengoniC. MichelagnoliPavel GolubevE. WilsonI. BurrowsM. L. CortésD. R. NapoliN. LalovićD. M. CullenL. CharlesHerbert HessE. MerchanBegoña QuintanaEric ClémentT. HabermannD. RaletT. AriciG. RainovskiN. KurzM. GórskaOliver WielandVicente GonzálezP. BoutachkovRaymond J. CarrollZs. PodolyákP. ReiterF. AmeilC. LizarazoF. C. L. CrespiEnrique SanchisNorbert PietrallaCh StahlD. Mahboubsubject
QuarkPhysicseducation.field_of_studyProton010308 nuclear & particles physicsNuclear TheoryPopulationGeneral Physics and Astronomy7. Clean energy01 natural sciencesResonance (particle physics)MomentumMetastability0103 physical sciencesAtomic physicsNuclear Experiment010306 general physicsNucleoneducationGround statedescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-11-23 | Physical Review Letters |