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Title: JLab Measurement of the 4He Charge Form Factor at Large Momentum Transfers

The charge form factor of 4He has been extracted in the range 29 fm-2 <= Q2 <= 77 fm-2 from elastic electron scattering, detecting 4He nuclei and electrons in coincidence with the High Resolution Spectrometers of the Hall A Facility of Jefferson Lab. The results are in qualitative agreement with realistic meson-nucleon theoretical calculations. The data have uncovered a second diffraction minimum, which was predicted in the Q2 range of this experiment, and rule out conclusively long-standing predictions of dimensional scaling of high-energy amplitudes using quark counting.
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Publication Date:
OSTI Identifier:
1126913
Report Number(s):
JLAB-PHY--13-1798; DOE/OR/23177--2803; arXiv:1309.5297
Journal ID: ISSN 0031-9007; NSF-PHY-0701679; NSF-PHY- 0652713; TRN: US1400276
DOE Contract Number:
AC05-06OR23177; AC02-06CH11357; FG02-96ER40950
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 112; Journal Issue: 13
Publisher:
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC) (United States)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS