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Title: Transparency of {sup 12}C for protons

Abstract

Existing cross-section data for 1p-shell knockout in the reaction {sup 12}C(e,e{sup '}p){sup 11}B --as obtained under different kinematic conditions--are shown to be mutually consistent, apart from a recent measurement performed in Mainz. New data have been collected at the Amsterdam Pulse Stretcher that confirm the normalization of the older measurements. An analysis of the world's {sup 12}C(e,e{sup '}p){sup 11}B data has yielded precise values of the spectroscopic factor for 1p-shell and 1s-shell knockout from {sup 12}C. These values have been used to evaluate the transparency of the {sup 12}C nucleus for 1p-shell and 1s-shell protons separately on the basis of recent high-energy {sup 12}C(e,e{sup '}p){sup 11}B data taken at a four-momentum transfer squared Q{sup 2} of 1.1 (GeV/c){sup 2}. As the resulting average value of the nuclear transparency, 0.81{+-}0.04, is considerably higher than the value obtained from previous analyses and theoretical estimates, the high Q{sup 2} data were used instead for an independent determination of the spectroscopic strength for 1p+1s knockout. Combining these results with the low Q{sup 2} data the spectroscopic factors appear to be momentum-transfer dependent. Possible explanations of these surprising results in terms of reaction-mechanism effects or a possible breakdown of the quasiparticle concept at high Q{supmore » 2} are discussed as well. (c) 2000 The American Physical Society.« less

Authors:
 [1];  [1];  [2];  [3];  [4];  [5]
  1. Nationaal Instituut voor Kernfysica en Hoge-Energiefysica (NIKHEF), P.O. Box 41882, 1009 DB Amsterdam, The Netherlands (Netherlands)
  2. School of Physics and Astronomy, Tel Aviv University, 69978 Tel Aviv, (Israel)
  3. Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
  4. (DESY), Hamburg, (Germany)
  5. Institute for Nuclear Physics, St. Petersburg, (Russian Federation)
Publication Date:
OSTI Identifier:
20216925
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 61; Journal Issue: 6; Other Information: PBD: Jun 2000; Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ELECTRON REACTIONS; CARBON 12 TARGET; SPECTROSCOPIC FACTORS; KNOCK-OUT REACTIONS; EXPERIMENTAL DATA; THEORETICAL DATA

Citation Formats

Lapikas, L., Steenhoven, G. van der, Frankfurt, L., Strikman, M., Deutsches Elektronen Synchrotron, and Zhalov, M. Transparency of {sup 12}C for protons. United States: N. p., 2000. Web. doi:10.1103/PhysRevC.61.064325.
Lapikas, L., Steenhoven, G. van der, Frankfurt, L., Strikman, M., Deutsches Elektronen Synchrotron, & Zhalov, M. Transparency of {sup 12}C for protons. United States. doi:10.1103/PhysRevC.61.064325.
Lapikas, L., Steenhoven, G. van der, Frankfurt, L., Strikman, M., Deutsches Elektronen Synchrotron, and Zhalov, M. Thu . "Transparency of {sup 12}C for protons". United States. doi:10.1103/PhysRevC.61.064325.
@article{osti_20216925,
title = {Transparency of {sup 12}C for protons},
author = {Lapikas, L. and Steenhoven, G. van der and Frankfurt, L. and Strikman, M. and Deutsches Elektronen Synchrotron and Zhalov, M.},
abstractNote = {Existing cross-section data for 1p-shell knockout in the reaction {sup 12}C(e,e{sup '}p){sup 11}B --as obtained under different kinematic conditions--are shown to be mutually consistent, apart from a recent measurement performed in Mainz. New data have been collected at the Amsterdam Pulse Stretcher that confirm the normalization of the older measurements. An analysis of the world's {sup 12}C(e,e{sup '}p){sup 11}B data has yielded precise values of the spectroscopic factor for 1p-shell and 1s-shell knockout from {sup 12}C. These values have been used to evaluate the transparency of the {sup 12}C nucleus for 1p-shell and 1s-shell protons separately on the basis of recent high-energy {sup 12}C(e,e{sup '}p){sup 11}B data taken at a four-momentum transfer squared Q{sup 2} of 1.1 (GeV/c){sup 2}. As the resulting average value of the nuclear transparency, 0.81{+-}0.04, is considerably higher than the value obtained from previous analyses and theoretical estimates, the high Q{sup 2} data were used instead for an independent determination of the spectroscopic strength for 1p+1s knockout. Combining these results with the low Q{sup 2} data the spectroscopic factors appear to be momentum-transfer dependent. Possible explanations of these surprising results in terms of reaction-mechanism effects or a possible breakdown of the quasiparticle concept at high Q{sup 2} are discussed as well. (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevC.61.064325},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 6,
volume = 61,
place = {United States},
year = {2000},
month = {6}
}