Abstract
The double-polarization observable E and helicity-dependent cross sections σ_{1/2}, σ_{3/2} have been measured for the photoproduction of π^{0} pairs off quasifree protons and neutrons at the Mainz MAMI accelerator with the Crystal Ball/TAPS setup. A circularly polarized photon beam was produced by bremsstrahlung from longitudinally polarized electrons and impinged on a longitudinally polarized deuterated butanol target. The reaction products were detected with an almost 4π covering calorimeter. The results reveal for the first time the helicity- and isospin-dependent structure of the γN→Nπ^{0}π^{0} reaction. They are compared to predictions from reaction models in view of nucleon resonance contributions and also to a refit of one model that predicted results for the proton and for the neutron target. The comparison of the prediction and the refit demonstrates the large impact of the new data.
Highlights
The double-polarization observable E and helicity-dependent cross sections σ1=2, σ3=2 have been measured for the photoproduction of π0 pairs off quasifree protons and neutrons at the Mainz MAMI accelerator with the Crystal Ball/TAPS setup
The results reveal for the first time the helicity- and isospin-dependent structure of the γN → Nπ0π0 reaction
Atomic spectroscopy has revealed the properties of the electromagnetic interaction in great detail
Summary
The double-polarization observable E and helicity-dependent cross sections σ1=2, σ3=2 have been measured for the photoproduction of π0 pairs off quasifree protons and neutrons at the Mainz MAMI accelerator with the Crystal Ball/TAPS setup. Helicity-Dependent Cross Sections for the Photoproduction of π0 Pairs from Nucleons The double-polarization observable E and helicity-dependent cross sections σ1=2, σ3=2 have been measured for the photoproduction of π0 pairs off quasifree protons and neutrons at the Mainz MAMI
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
