• Open Access

Helicity-Dependent Cross Sections for the Photoproduction of π0 Pairs from Nucleons

M. Dieterle et al. (A2 Collaboration)
Phys. Rev. Lett. 125, 062001 – Published 5 August 2020

Abstract

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. 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 γNNπ0π0 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.

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  • Received 10 January 2020
  • Revised 17 May 2020
  • Accepted 15 July 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.062001

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 125, Iss. 6 — 7 August 2020

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