Photo- and Electro-excitation of Bound Neutrons and Protons

Journal Article · 24 May 2018 · Few-Body Systems

DOI: https://doi.org/10.1007/s00601-018-1404-9 · OSTI ID:1543491

Nakamura, Satoshi X. ^[1]

---

1. Univ. Cruzeiro do Sul, Sao Paulo (Brazil). Lab. of Theoretical Physics and Scientific Computing (LFTC)

Data for pion photo-productions off the neutron ( γn→πN ) have been mainly extracted from deuteron-target data ( γd→πNN ) by applying kinematical cuts thereby isolating the quasi-free samples. We critically explore if the neutron-target data obtained through this conventional procedure can be contaminated by final state interactions (FSI) and/or the kinematical cuts. The analysis is conducted with a theoretical model for γd→πNN that takes account of the impulse mechanisms supplemented by the NN and πN rescattering mechanisms. We show that the FSI effects still visibly remain in the extracted γ ‘n’ →πN unpolarized cross sections and polarization asymmetries E even after the kinematical cuts are applied. We also find the FSI effects on γ ‘n’ →π⁰n can be somewhat different from those on γ ‘p’ →π⁰p .

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1543491
• Journal Information: Few-Body Systems, Journal Name: Few-Body Systems Journal Issue: 5 Vol. 59; ISSN 0177-7963
• Publisher: SpringerCopyright Statement
• Country of Publication: United States
• Language: English