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Title: Photo- and Electro-excitation of Bound Neutrons and Protons

Abstract

Data for pion photo-productions off the neutron ( γn→πN ) have been primarily extracted from deuteron-target data ( γd→πNN ) by applying kinematical cuts thereby isolating the quasi-free samples. We critically examine 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 .

Authors:
 [1]
  1. Univ. Cruzeiro do Sul, Sao Paulo (Brazil). Lab. of Theoretical Physics and Scientific Computing (LFTC)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1543491
DOE Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Few-Body Systems
Additional Journal Information:
Journal Volume: 59; Journal Issue: 5; Journal ID: ISSN 0177-7963
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
Physics

Citation Formats

Nakamura, Satoshi X. Photo- and Electro-excitation of Bound Neutrons and Protons. United States: N. p., 2018. Web. doi:10.1007/s00601-018-1404-9.
Nakamura, Satoshi X. Photo- and Electro-excitation of Bound Neutrons and Protons. United States. doi:10.1007/s00601-018-1404-9.
Nakamura, Satoshi X. Thu . "Photo- and Electro-excitation of Bound Neutrons and Protons". United States. doi:10.1007/s00601-018-1404-9.
@article{osti_1543491,
title = {Photo- and Electro-excitation of Bound Neutrons and Protons},
author = {Nakamura, Satoshi X.},
abstractNote = {Data for pion photo-productions off the neutron ( γn→πN ) have been primarily extracted from deuteron-target data ( γd→πNN ) by applying kinematical cuts thereby isolating the quasi-free samples. We critically examine 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 .},
doi = {10.1007/s00601-018-1404-9},
journal = {Few-Body Systems},
issn = {0177-7963},
number = 5,
volume = 59,
place = {United States},
year = {2018},
month = {5}
}