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Title: New measurements of the EMC effect in few-body nuclei.

Abstract

Measurements of the EMC effect show that the quark distributions in nuclei are not simply the sum of the quark distributions of the constituent nucleons. However, interpretation of the EMC effect is limited by the lack of a reliable baseline calculation of the effects of Fermi motion and nuclean binding. We present preliminary results from JLab experiment E03-103, a precise measurement of the EMC effect in few-body and heavy nuclei. These data emphasize the large-xregion, where binding and Fermi motion effects dominate, and thus will provide much better constraints an the effects of binding. These data will also allow for comparisons to calculations far few-body nuclei, where the uncertainty in the nuclear structure is minimized.

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
971454
Report Number(s):
ANL/PHY/CP-58334
TRN: US1001202
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Journal Name: J. Phys.: Conf. Ser.; Journal Volume: 69; Journal Issue: 2007; Conference: 2nd Annual Meeting of the American Physical Society Topical Group on Hadron Physics; Oct. 22, 2006 - Oct. 24, 2006; Nashville, TN
Country of Publication:
United States
Language:
ENGLISH
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; EMC EFFECT; HADRONS; HEAVY NUCLEI; NUCLEAR STRUCTURE; NUCLEI; NUCLEONS; PHYSICS; QUARKS

Citation Formats

Arrington, J., and Physics. New measurements of the EMC effect in few-body nuclei.. United States: N. p., 2007. Web. doi:10.1088/1742-6596/69/1/012024.
Arrington, J., & Physics. New measurements of the EMC effect in few-body nuclei.. United States. doi:10.1088/1742-6596/69/1/012024.
Arrington, J., and Physics. Mon . "New measurements of the EMC effect in few-body nuclei.". United States. doi:10.1088/1742-6596/69/1/012024.
@article{osti_971454,
title = {New measurements of the EMC effect in few-body nuclei.},
author = {Arrington, J. and Physics},
abstractNote = {Measurements of the EMC effect show that the quark distributions in nuclei are not simply the sum of the quark distributions of the constituent nucleons. However, interpretation of the EMC effect is limited by the lack of a reliable baseline calculation of the effects of Fermi motion and nuclean binding. We present preliminary results from JLab experiment E03-103, a precise measurement of the EMC effect in few-body and heavy nuclei. These data emphasize the large-xregion, where binding and Fermi motion effects dominate, and thus will provide much better constraints an the effects of binding. These data will also allow for comparisons to calculations far few-body nuclei, where the uncertainty in the nuclear structure is minimized.},
doi = {10.1088/1742-6596/69/1/012024},
journal = {J. Phys.: Conf. Ser.},
number = 2007,
volume = 69,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
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  • Measurements of the EMC effect show that the quark distributions in nuclei are not simply the sum of the quark distributions of the constituent nucleons. However, interpretation of the EMC effect is limited by the lack of a reliable baseline calculation of the effects of Fermi motion and nucleon binding. We present preliminary results from JLab experiment E03-103, a precise measurement of the EMC effect in few-body and heavy nuclei. These data emphasize the large-x region, where binding and Fermi motion effects dominate, and thus will provide much better constraints on the effects of binding. These data will also allowmore » for comparisons to calculations for few-body nuclei, where the uncertainty in the nuclear structure is minimized.« less
  • Recent data on the EMC effect from Jefferson Lab experiment E03103 suggest that the nuclear dependence of the high x quark distribution may depend on the local nuclear environment, rather than being a purely bulk effect. We briefly discuss the analysis and results of the E03103 experiment focusing on the light nuclei and high x region. In addition, we also discuss a future experiment at the upgraded 12 GeV Jefferson Lab facility which will further investigate the role of the local nuclear environment and the influence of detailed nuclear structure on the modification of quark distributions.
  • Recent data on the EMC effect from Jefferson Lab experiment E03103 suggest that the nuclear dependence of the high x quark distribution may depend on the local nuclear environment, rather than being a purely bulk effect. We briefly discuss the analysis and results of the E03103 experiment focusing on the light nuclei and high x region. In addition, we also discuss a future experiment at the upgraded 12 GeV Jefferson Lab facility which will further investigate the role of the local nuclear environment and the influence of detailed nuclear structure on the modification of quark distributions.
  • While the modification of structure functions in nuclei (the EMC Effect) has been the focus of intense experimental and theoretical study since the original discovery in 1983, the experimental emphasis has been on heavy or mediumheavy nuclei. The theoretical interpretation of the EMC Effect is far from clear; it remains difficult to disentangle the "conventional" nuclear physics effects of binding and Fermi motion from more exotic effects. The study of the EMC Effect in light nuclei, where the detailed nuclear structure is well understood, and at large x, where effects from Fermi motion dominate, will add new insight into themore » underlying mechanism at work. Experiment E03103 at Jefferson Lab measured electron scattering cross sections from nuclei (A=3 to 197) and the deuteron to provide new data on the EMC Effect. These measurements will greatly improve the precision of the existing data set on 4He, provide the first measurement of the EMC Effect in 3He for x>0.5, a« less
  • Modifications of structure functions in nuclei (EMC effect) suggest that the nuclear quark distribution function is not just the incoherent sum of the proton and neutron distributions, and made clear the importance of nuclear effects even in high energy measurements. Jefferson Lab experiment E03-103 made precise measurements of the EMC effect in few-body and heavy nuclei with emphasis on the large x region. Data from the light nuclei suggests that the nuclear dependence of the high x quark distribution may depend on the nucleon's local environment, rather than being a purely bulk effect.