Atac H, Constantinou M, Meziani ZE, Paolone M, Sparveris N. Measurement of the neutron charge radius and the role of its constituents.
Nat Commun 2021;
12:1759. [PMID:
33741952 PMCID:
PMC7979702 DOI:
10.1038/s41467-021-22028-z]
[Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 02/22/2021] [Indexed: 11/24/2022] Open
Abstract
The neutron is a cornerstone in our depiction of the visible universe. Despite the neutron zero-net electric charge, the asymmetric distribution of the positively- (up) and negatively-charged (down) quarks, a result of the complex quark-gluon dynamics, lead to a negative value for its squared charge radius, \documentclass[12pt]{minimal}
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\begin{document}$$\langle {r}_{{\rm{n}}}^{2}\rangle$$\end{document}⟨rn2⟩. The precise measurement of the neutron’s charge radius thus emerges as an essential part of unraveling its structure. Here we report on a \documentclass[12pt]{minimal}
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\begin{document}$$\langle {r}_{{\rm{n}}}^{2}\rangle$$\end{document}⟨rn2⟩ measurement, based on the extraction of the neutron electric form factor, \documentclass[12pt]{minimal}
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\begin{document}$${G}_{{\rm{E}}}^{{\rm{n}}}$$\end{document}GEn, at low four-momentum transfer squared (Q2) by exploiting the long known connection between the N → Δ quadrupole transitions and the neutron electric form factor. Our result, \documentclass[12pt]{minimal}
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\begin{document}$$\langle {r}_{{\rm{n}}}^{2}\rangle =-0.110\pm 0.008\,({{\rm{fm}}}^{2})$$\end{document}⟨rn2⟩=−0.110±0.008(fm2), addresses long standing unresolved discrepancies in the \documentclass[12pt]{minimal}
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\begin{document}$$\langle {r}_{{\rm{n}}}^{2}\rangle$$\end{document}⟨rn2⟩ determination. The dynamics of the strong nuclear force can be viewed through the precise picture of the neutron’s constituent distributions that result into the non-zero \documentclass[12pt]{minimal}
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\begin{document}$$\langle {r}_{{\rm{n}}}^{2}\rangle$$\end{document}⟨rn2⟩ value.
The charge radius of nucleons provides information about their structure. Here the authors present a method, based values of neutron electric form factors, to determine the charge radius of the neutron and provide information on improving the uncertainty of neutron charge radius measurements
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