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

Title: A New Era for Jefferson Lab

Abstract

On a cool Saturday morning in late April a seemingly endless stream of cars turned off Jefferson Avenue in Newport News, Virginia, bringing 12,000 people ages 1 to 91 to the Open House to learn more about “the new era in science” at the Thomas Jefferson National Accelerator Facility. Here, the visitors were dazzled by the complex equipment, the enthusiastic staff, and the advanced technology at the Laboratory.

Authors:
 [1];  [1];  [1]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1398390
Report Number(s):
JLAB-PHY-16-2206; DOE/OR/23177-3840
Journal ID: ISSN 1061-9127; TRN: US1702596
Grant/Contract Number:
AC05-06OR23177
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Physics News
Additional Journal Information:
Journal Volume: 26; Journal Issue: 3; Journal ID: ISSN 1061-9127
Publisher:
Taylor & Francis
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 43 PARTICLE ACCELERATORS

Citation Formats

McKeown, R. D., Montgomery, H. E., and Pennington, M. R. A New Era for Jefferson Lab. United States: N. p., 2016. Web. doi:10.1080/10619127.2016.1211454.
McKeown, R. D., Montgomery, H. E., & Pennington, M. R. A New Era for Jefferson Lab. United States. doi:10.1080/10619127.2016.1211454.
McKeown, R. D., Montgomery, H. E., and Pennington, M. R. Fri . "A New Era for Jefferson Lab". United States. doi:10.1080/10619127.2016.1211454. https://www.osti.gov/servlets/purl/1398390.
@article{osti_1398390,
title = {A New Era for Jefferson Lab},
author = {McKeown, R. D. and Montgomery, H. E. and Pennington, M. R.},
abstractNote = {On a cool Saturday morning in late April a seemingly endless stream of cars turned off Jefferson Avenue in Newport News, Virginia, bringing 12,000 people ages 1 to 91 to the Open House to learn more about “the new era in science” at the Thomas Jefferson National Accelerator Facility. Here, the visitors were dazzled by the complex equipment, the enthusiastic staff, and the advanced technology at the Laboratory.},
doi = {10.1080/10619127.2016.1211454},
journal = {Nuclear Physics News},
number = 3,
volume = 26,
place = {United States},
year = {Fri Sep 16 00:00:00 EDT 2016},
month = {Fri Sep 16 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Save / Share:
  • Recently an experiment at Jefferson Lab has measured the proton form factor ratio {mu}{sub p}G{sub E}{sup p}/G{sub M}{sup p}, down to Q{sup 2} {approx} 0.3 GeV{sup 2} with unprecedented precision. Based on the results from this experiment, a re-analysis was carried out for the world data on proton form factors, and a new result was extracted for the proton charge radius. The new result is consistent with published CODATA results and is at odds with the new muonic hydrogen measurement at PSI. We present the results of the new measurement, as well as discuss an upcoming experiment to measure themore » form factor ratio down to even lower Q{sup 2}.« less
  • The Bloom-Gilman duality has been experimentally demonstrated for spin independent structure functions. Duality is observed when the smooth scaling curve at high momentum transfer is an average over the resonance bumps at lower momentum transfer, but at the same value of scaling variable x. Signs of quark-hadron duality for the spin Dependant structure function g1 of the proton has been recently reported by the Hermes collaboration. Experimental Halls A, B and C at Jefferson lab have recently measured spin structure functions in the resonance region for the proton and the neutron. Data from these experiments combined with Deep-Inelastic-Scattering data providemore » a precision test of quark-hadron duality predictions for spin structure functions for both the proton and the neutron. This will be one of the first precision tests of spin and flavor dependence of quark-hadron duality.« less
  • We present studies of single-spin and double-spin asymmetries in semi-inclusive electroproduction of pions using the CEBAF 6 GeV polarized electron beam. Kinematic dependences of single and double spin asymmetries have been measured in a wide kinematic range at CLAS with a polarized NH3 target. Significant target-spin sin 2{phi} and sin{phi} asymmetries have been observed. The hypothesis of factorization has been tested with z-dependence of the double spin asymmetry.
  • New measurements using the 6 GeV continuous electron beam and the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab have collected information on the form factors and the unpolarized structure functions of the neutron, with minimal uncertainty from nuclear binding effects. One experiment has also tried to measure these binding effects more directly, using the method of 'spectator tagging'. These experiments are forerunners for an extensive program with the energy-upgraded 12 GeV accelerator at Jefferson Lab.
  • The Q{sub weak} collaboration will make the first precision determination of the proton's weak charge, Q{sub W}{sup P} = 1-4 sin{sup 2} {theta}{sub w}, from a measurement of the parity-violating asymmetry in elastic electron-proton scattering at very low momentum transfer. The results will determine the proton's weak charge with a 4% total error. The Standard Model makes a firm prediction of Q{sub W}{sup P}, based on the running of the weak mixing angle, sin{sup 2} {theta}{sub w}, from the Z{sup 0} pole down to low energies, corresponding to a 10{sigma} effect in this experiment. Any significant deviation of sin{sup 2}more » {theta}{sub w} from the Standard Model prediction at low Q{sup 2} would be a signal of new physics, wheras agreement would place new and significant constraints on possible Standard Model extensions at the TeV mass scale.« less