skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Measurement of the generalized spin polarizabilities of the neutron in the low-Q2 region

Journal Article · · Nature Physics
; ; ; ORCiD logo; ; ; ORCiD logo; ; ; ; ; ; ; ; ORCiD logo; ; ; ; ; ORCiD logo more »; ; ; ; ; ; ; ; ; ; ; ORCiD logo; ; ; ; ; ; ; ; ; ; ORCiD logo; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ORCiD logo; ; ORCiD logo; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ORCiD logo; ; ; ; ; ORCiD logo; « less

Understanding the nucleon spin structure in the regime where the strong interaction becomes truly strong poses a challenge to both experiment and theory. At energy scales below the nucleon mass of about 1 GeV, the intense interaction among the quarks and gluons inside the nucleon makes them highly correlated. Their coherent behaviour causes the emergence of effective degrees of freedom, requiring the application of non-perturbative techniques such as chiral effective field theory1. Here we present measurements of the neutron’s generalized spin polarizabilities that quantify the neutron’s spin precession under electromagnetic fields at very low energy-momentum transfer squared down to 0.035 GeV2. In this regime, chiral effective field theory calculations2,3,4 are expected to be applicable. Finally, our data, however, show a strong discrepancy with these predictions, presenting a challenge to the current description of the neutron’s spin properties.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF)
Contributing Organization:
Jefferson Lab E97-110 Collaboration
Grant/Contract Number:
AC05-06OR23177; PHY-0099557
OSTI ID:
1798459
Report Number(s):
JLAB-PHY-21-3312; DOE/OR/23177-5119; arXiv:2103.03333; TRN: US2210675
Journal Information:
Nature Physics, Vol. 17, Issue 6; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English

References (30)

Source Theory Viewpoints in Deep Inelastic Scattering journal January 1975
Forward doubly-virtual Compton scattering off the nucleon in chiral perturbation theory. II. Spin polarizabilities and moments of polarized structure functions journal December 2020
On the extraction of the neutron spin structure functions and the Gerasimov-Drell-Hearn integral from the process in the resonance region journal July 1997
Precise determination of the deuteron spin structure at low to moderate Q 2 with CLAS and extraction of the neutron contribution journal November 2015
Proton and neutron electromagnetic form factors and uncertainties journal February 2018
Measurement of the Q 2 Dependence of the Deuteron Spin Structure Function g 1 and its Moments at Low Q 2 with CLAS journal February 2018
Spin structure of the nucleon at low energies journal April 2003
Measurement of the 3He spin-structure functions and of neutron (3He) spin-dependent sum rules at 0.035 ≤ Q2 ≤ 0.24 GeV2 journal June 2020
Updating spin-dependent Regge intercepts journal August 2018
Momentum-space treatment of the Coulomb interaction in three-nucleon reactions with two protons journal May 2005
Proton polarizations in polarized He 3 studied with the He 3 → ( e → , e ' p ) d and He 3 → ( e → , e ' p ) pn processes journal November 2005
A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV journal January 1999
The Gerasimov–Drell–Hearn sum rule journal October 2006
Moments of spin Structure Functions: sum Rules and Polarizabilities journal October 2010
Use of Causality Conditions in Quantum Theory journal September 1954
The QCD running coupling journal September 2016
The spin structure of the nucleon journal June 2019
New insights into the spin structure of the nucleon journal March 2013
Virtual compton scattering and generalized polarizabilities of the proton journal September 1995
Nucleon polarizabilities: From Compton scattering to hydrogen atom journal May 2016
Basic instrumentation for Hall A at Jefferson Lab
  • Alcorn, J.; Anderson, B. D.; Aniol, K. A.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 522, Issue 3 https://doi.org/10.1016/j.nima.2003.11.415
journal April 2004
High-resolution hypernuclear spectroscopy at Jefferson Lab, Hall A journal May 2019
Measurement of the Generalized Forward Spin Polarizabilities of the Neutron journal October 2004
Exact Sum Rule for Nucleon Magnetic Moments journal May 1966
Chiral Dynamics in Nucleons and Nuclei journal June 1995
Nucleon Structure Functions from Operator Product Expansion on the Lattice journal June 2017
Moments of nucleon structure functions at next-to-leading order in baryon chiral perturbation theory journal November 2014
Sum rules for forward virtual compton scattering journal February 1970
Burkhardt-Cottingham sum rule and forward spin polarizabilities in heavy baryon chiral perturbation theory journal January 2003
Experimental Investigation of Pion Electroproduction journal February 1963

Similar Records

Measurement of the Generalized Spin Polarizabilities of the Neutron in the Low-Q{sup 2} Region
Journal Article · Tue Jun 01 00:00:00 EDT 2021 · Nature Physics · OSTI ID:1798459
+8 more
The Spin Structure of the Proton at Low $Q^2$: A Measurement of the Structure Function $g^2_p$
Thesis/Dissertation · Wed Jun 01 00:00:00 EDT 2016 · OSTI ID:1798459
New results on the neutron spin polarizabilities at low Q**2.
Conference · Sat Oct 01 00:00:00 EDT 2011 · AIP Conf. Proc. · OSTI ID:1798459

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
experimental nuclear physics
experimental particle physics
theoretical nuclear physics
theoretical particle physics