Measurement of double-polarization asymmetries in the quasi-elastic He→3(e→,ep) process

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3 Scopus citations

Abstract

We report on a precise measurement of double-polarization asymmetries in electron-induced breakup of He3 proceeding to pd and ppn final states, performed in quasi-elastic kinematics at Q2=0.25(GeV/c)2 for missing momenta up to 250MeV/c. These observables represent highly sensitive tools to investigate the electromagnetic and spin structure of He3 and the relative importance of two- and three-body effects involved in the breakup reaction dynamics. The measured asymmetries cannot be satisfactorily reproduced by state-of-the-art calculations of He3 unless their three-body segment is adjusted, indicating that the spin-dependent part of the nuclear interaction governing the three-body breakup process is much smaller than previously thought.

Original languageEnglish
Pages (from-to)117-121
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume788
DOIs
StatePublished - Jan 10 2019

Bibliographical note

Funding Information:
We thank the Jefferson Lab Hall A and Accelerator Operations technical staff for their outstanding support. This work was supported in part by the National Science Foundation and the U.S. Department of Energy . Jefferson Science Associates, LLC, operates Jefferson Lab for the U.S. DOE under U.S. DOE contract DE-AC05-06OR23177 . This work was supported in part by the Slovenian Research Agency (research core funding No. P1–0102 ). This work is a part of the LENPIC project and was supported by the Polish National Science Centre under Grants No. 2016/22/M/ST2/00173 and 2016/21/D/ST2/01120 . The numerical calculations of the Krakow group were partially performed on the supercomputer cluster of the JSC, Jülich, Germany.

Funding Information:
We thank the Jefferson Lab Hall A and Accelerator Operations technical staff for their outstanding support. This work was supported in part by the National Science Foundation and the U.S. Department of Energy. Jefferson Science Associates, LLC, operates Jefferson Lab for the U.S. DOE under U.S. DOE contract DE-AC05-06OR23177. This work was supported in part by the Slovenian Research Agency (research core funding No. P1–0102). This work is a part of the LENPIC project and was supported by the Polish National Science Centre under Grants No. 2016/22/M/ST2/00173 and 2016/21/D/ST2/01120. The numerical calculations of the Krakow group were partially performed on the supercomputer cluster of the JSC, Jülich, Germany.

Publisher Copyright:
© 2018 The Author

Keywords

  • Double-polarization asymmetry
  • Helium-3 nucleus
  • Proton knock-out

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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