Quasi-free ${\pi }^0$ Photoproduction from the Bound Nucleon

Abstract

Differential cross-sections for quasi-free ${\pi }^0$ photoproduction from the proton and neutron bound in the deuteron have been measured for $E_{\gamma }=200-400$ MeV at ${\theta }_{\gamma }^{\mathrm{lab}}=136.2^{\circ }$ usind the Glasgow photon tagger at MAMI, the Mainz 48 cm $\varnothing$ $\times$ 64 cm NaI(Tl) photon detector and the Göttingen SENECA recoil detector. For the proton measurements made with both liquid deuterium and liquid hydrogen targets allow direct comparison of "free" ${\pi }^0$ photoproduction cross-sections as extracted from the bound proton data with experimental free cross sections which are found to be in reasonable agreement below 320 MeV. At higher energies the "free" cross sections extracted from quasifree data are significantly smaller than the experimental free cross sections and theoretical predictions based on multipole analysis. For the first time, "free" neutron cross sections have been extracted in the $\Delta$-region. They are also in agreement with the predictions from multipole analysis up to 320 MeV and significantly smaller at higher photon energies.

References in corpus (13)

• The high-precision, charge-dependent Bonn nucleon-nucleon potential (CD-Bonn)
• A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
• Analysis of Pion Photoproduction Data
• Pion cloud and the $Q^2-$dependence of ${\gamma }^{\ast }N\leftrightarrow \Delta$ transition form factors
• Test of low-energy theorems for p(\vec{gamma},π^{0})p in the threshold region
• Pi0 photo- and electroproduction at threshold within a dynamical model
• Influence of final state interaction on incoherent pion photoproduction on the deuteron in the region of the Delta-resonance
• Quasi-free Compton Scattering and the Polarizabilities of the Neutron
• Neutron polarizabilities investigated by quasi-free Compton scattering from the deuteron
• Meson-exchange $\pi N$ Models in Three-Dimensional Bethe-Salpeter Formulation
• Backward spin polarizability ${\gamma }_{\pi }$ of the proton
• Quasifree pion photoproduction on the deuteron in the $\Delta$ region
• The reaction ${}^{2}H(\gamma ,{\pi }^0)np$ in the threshold region

Cited by in corpus (6)

• Incoherent pion photoproduction on the deuteron in the first resonance region
• Neutral pion photoproduction on the nucleon in a chiral quark model
• Photoproduction of {\boldmath{${\pi }^0$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region
• Extraction of $\gamma n\to \pi N$ observables from deuteron-target data
• Single-pion contribution to the Gerasimov--Drell--Hearn sum rule and related integrals
• Single ${\pi }^0$ Production Off Neutrons Bound in Deuteron with Linearly Polarized Photons