The {sup 4}He(e,e'p) Cross Section at Large Missing Energy Page: 1 of 4
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The 4He(e, e'p) Cross Section at Large Missing Energy
J. J. van Leeuwe'a H.P. Blok,a,b J.F.J. van den Brand,C H.J. Bulten,C G.E. Dodge,a,b * R.
Ent,d W.H.A. Hesselink,ab, E. Jansa, W. J. Kasdorp,a J.M. Laget,e L. Lapikis,a C.J.G.
Onderwater'a,b A.R. Pellegrino,a ,b C.M. Spaltro,a b J. J. M. Steijgera J.A. Templon,abt$
0. Unal
aNIKHEF, P.O. Box 41882, 1009 DB Amsterdam, The Netherlands
q) bDepartment of Physics and Astronomy, Vrije Universiteit Amsterdam, de Boelelaan
1081, 1081 HV Amsterdam, The Netherlands
C
C CDepartment of Physics, University of Wisconsin, Madison, Wisconsin 53706 USA
dJefferson Laboratory, 12000 Jefferson Avenue, Newport News, Virginia, 23606 USA
r- *Service de Physique Nucleaire, Centre d'Etudes de Saclay, 91191 Gif-sur-Yvette Cedex,
France
O The (e, e'p) reaction on 4He nuclei was studied in kinematics designed to emphasize
effects of nuclear short-range correlations. The measured cross sections display a peak
in the kinematical regions where two-nucleon processes are expected to dominate. The-
oretical models incorporating short-range correlation effects agree reasonably with the
.. data.
U
1. Introduction
-" The Independent-Particle Shell Model (IPSM) of nuclei has been very successful in pro-
viding understanding of many of the observed properties of nuclei in the ground state and
ct low-lying excited states. Over the last decade, the IPSM has been extensively tested by
the results of (e, e'p) experiments, which probe the Fourier transform of individual nucleon
wavefunctions [1,2]. The data indicate that the shell model provides good understanding
of the nucleon wavefunctions, but that states that in the IPSM are fully occupied, can
be depleted by as much as 35%. Recent theoretical studies also seem to have converged
on such a picture [3]. The depletion comes about since nucleons are undergoing violent
pairwise collisions which cause a portion of their wavefunction to be quite different than
that predicted by the IPSM.
These (e, e'p) experiments first concentrated on measurements in kinematics where the
residual A - 1 nuclear systems had low recoil momenta and excitation energies, since this
*Permanent Address: Department of Physics, Old Dominion University, Norfolk, Virigina USA
tPermanent Address: Dept. of Physics and Astronomy, University of Georgia, Athens, Georgia, USA
tTalk given at the 15th International Conference on Few-Body Problems in Physics, Groningen, The
Netherlands, 22 26 July 1997
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Leeuwe, J.J. van; Blok, H.P.; Brand, J.F.J. van den; Bulten, H.J.; Dodge, G.E.; Ent, R. et al. The {sup 4}He(e,e'p) Cross Section at Large Missing Energy, article, July 1, 1997; Newport News, Virginia. (https://digital.library.unt.edu/ark:/67531/metadc743336/m1/1/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.