Clean measurements of the nucleon axial-vector and free-neutron magnetic form factors

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We discuss the feasibility of a weak charged current experiment using a low energy electron beam. A first goal is to measure the Q^2 dependence of the axial-vector form factor g_a(Q^2). It can be measured model-independently and as robustly as for electromagnetic form factors from typical electron scattering experiments, in contrast to the methods used so far to measure g_a(Q^2). If g_a(Q^2) follows a dipole form, the axial mass can be extracted with a better accuracy than the world data altogether. The most important detection equipment would be a segmented neutron detector with good momentum and angular resolution that is … continued below

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Deur, Alexandre P. November 1, 2013.

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We discuss the feasibility of a weak charged current experiment using a low energy electron beam. A first goal is to measure the Q^2 dependence of the axial-vector form factor g_a(Q^2). It can be measured model-independently and as robustly as for electromagnetic form factors from typical electron scattering experiments, in contrast to the methods used so far to measure g_a(Q^2). If g_a(Q^2) follows a dipole form, the axial mass can be extracted with a better accuracy than the world data altogether. The most important detection equipment would be a segmented neutron detector with good momentum and angular resolution that is symmetric about the beam direction, and covers a moderate angular range. A high intensity beam (100 uA) is necessary. Beam polarization is highly desirable as it provides a clean measurement of the backgrounds. Beam energies between 70 and 110 MeV are ideal. This range would provide a Q^2 mapping of g_a between 0.01

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  • Journal Name: AIP Conf. Proc.; Journal Volume: 1563; Conference: Workshop to explore physics opportunities with intense, polarized electron beams at 50-300 MeV, 14-16 March 2013, Cambridge, Massachusetts

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  • Report No.: JLAB-PHY-13-1753
  • Report No.: DOE/OR/23177-2614
  • Report No.: arXiv:1307.2927
  • Grant Number: AC05-06OR23177
  • Digital Object Identifier: https://doi.org/10.1063/1.4829413
  • Office of Scientific & Technical Information Report Number: 1108414
  • Archival Resource Key: ark:/67531/metadc868614

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  • November 1, 2013

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  • Sept. 16, 2016, 12:32 a.m.

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  • Nov. 4, 2016, 6:50 p.m.

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Deur, Alexandre P. Clean measurements of the nucleon axial-vector and free-neutron magnetic form factors, article, November 1, 2013; Newport News, Virginia. (https://digital.library.unt.edu/ark:/67531/metadc868614/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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