Quasi-free photoproduction of eta-mesons of the neutron
I. Jaegle, T. Mertens, A.V. Anisovich, J.C.S. Bacelar, B. Bantes, O., Bartholomy, D. Bayadilov, R. Beck, Y.A. Beloglazov, R. Castelijns, V. Crede,, H. Dutz, A. Ehmanns, D. Elsner, K. Essig, R. Ewald, I. Fabry, M. Fuchs, C., Funke, R. Gothe, R. Gregor, A.B. Gridnev, E. Gutz
TL;DR
This study measures eta-meson photoproduction off bound neutrons and protons, revealing a unique resonance structure for neutrons that enhances understanding of nucleon excitation states.
Contribution
It provides the first detailed comparison of eta photoproduction on bound neutrons and protons, identifying a neutron-specific resonance feature.
Findings
A pronounced bump at W=1.68 GeV for neutrons
No similar structure observed for protons
Enhanced understanding of nucleon resonance behavior
Abstract
Quasi-free photoproduction of eta-mesons off nucleons bound in the deuteron has been measured with the CBELSA/TAPS detector for incident photon energies up to 2.5 GeV at the Bonn ELSA accelerator. The eta-mesons have been detected in coincidence with recoil protons and recoil neutrons, which allows a detailed comparison of the quasi-free n(gamma,eta)n and p(gamma,eta)p reactions. The excitation function for eta-production off the neutron shows a pronounced bump-like structure at W=1.68 GeV (E_g ~ 1 GeV), which is absent for the proton.
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