Role of the Δ Resonance in the Population of a Four-Nucleon State in the Fe56Fe54 Reaction at Relativistic Energies

Zs. Podolyák et al.
Phys. Rev. Lett. 117, 222302 – Published 23 November 2016

Abstract

The Fe54 nucleus was populated from a Fe56 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 Fe56 ground state. The isomeric state was produced in the low-momentum (-energy) tail of the parallel momentum (energy) distribution of Fe54, 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 Fe54 is a consequence of the quark structure of the nucleons.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 2 June 2016

DOI:https://doi.org/10.1103/PhysRevLett.117.222302

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Click to Expand

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 117, Iss. 22 — 25 November 2016

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×