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Beam-target double-spin asymmetry in quasielastic electron scattering off the deuteron with CLAS

Journal Article · · Physical Review C
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The deuteron plays a pivotal role in nuclear and hadronic physics, as both the simplest bound multinucleon system and as an effective neutron target. Quasielastic electron scattering on the deuteron is a benchmark reaction to test our understanding of deuteron structure and the properties and interactions of the two nucleons bound in the deuteron. The experimental data presented here can be used to test state-of-the-art models of the deuteron and the two-nucleon interaction in the final state after two-body breakup of the deuteron. Focusing on polarization degrees of freedom, we gain information on spin-momentum correlations in the deuteron ground state (due to the D-state admixture) and on the limits of the impulse approximation (IA) picture as it applies to measurements of spin-dependent observables like spin structure functions for bound nucleons. Information on this reaction can also be used to reduce systematic uncertainties on the determination of neutron form factors or deuteron polarization through quasielastic polarized electron scattering. Furthermore, we measured the beam-target double-spin asymmetry (A||) for quasielastic electron scattering off the deuteron at several beam energies (1.6–1.7, 2.5, 4.2, and 5.6–5.8GeV), using the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. The deuterons were polarized along (or opposite to) the beam direction. The double-spin asymmetries were measured as a function of photon virtuality Q2 (0.13–3.17(GeV/c)2), missing momentum (pm=0.0–0.5GeV/c), and the angle between the (inferred) spectator neutron and the momentum transfer direction (θnq). We compare our results with a recent model that includes final-state interactions (FSI) using a complete parametrization of nucleon-nucleon scattering, as well as a simplified model using the plane wave impulse approximation (PWIA). We find overall good agreement with both the PWIA and FSI expectations at low to medium missing momenta (pm≤0.25GeV/c), including the change of the asymmetry due to the contribution of the deuteron D state at higher momenta. At the highest missing momenta, our data clearly agree better with the calculations including FSI. Final-state interactions seem to play a lesser role for polarization observables in deuteron two-body electrodisintegration than for absolute cross sections. Our data, while limited in statistical power, indicate that PWIA models work reasonably well to understand the asymmetries at lower missing momenta. In turn, this information can be used to extract the product of beam and target polarization (PbPt) from quasielastic electron-deuteron scattering, which is useful for measurements of spin observables in electron-neutron inelastic scattering. But, at the highest missing (neutron) momenta, FSI effects become important and must be accounted for.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States); George Washington Univ., Washington, DC (United States); Mississippi State Univ., Starkville, MS (United States); Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Organization:
Instituto Nazionale di Fisica Nucleare (INFN); National Research Foundation (NRF) of Korea; National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); United Kingdom Science and Technology Facilities Council
Contributing Organization:
CLAS Collaboration
Grant/Contract Number:
AC02-06CH11357; AC05-06OR23177; FG02-07ER41528; FG02-96ER40960; SC0016583
OSTI ID:
1345562
Alternate ID(s):
OSTI ID: 1604554
OSTI ID: 1344952
OSTI ID: 1430441
OSTI ID: 1439892
OSTI ID: 1373588
Report Number(s):
DOE/OR/23177--3973; JLAB-PHY--16-2371; arXiv:1610.06109
Journal Information:
Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 95; ISSN PRVCAN; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

The spin structure of the nucleon journal January 2005
The spin structure of the nucleon journal January 1994
The spin structure of the nucleon journal June 2019
Nucleon-nucleon correlations, short-lived excitations, and the quarks within journal November 2017
The Spin Structure of the Nucleon: Proceeding of International School of Nucleon Structure: 1st Course conference April 2017
Nucleon-Nucleon Correlations, Short-lived Excitations, and the Quarks Within text January 2016

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
deuteron structure
final state interaction
quasi-elastic electron scattering
spin observables