This is not the latest version of this item. The latest version can be found here.
Direct Observation of Proton-Neutron Short-Range Correlation Dominance in Heavy Nuclei
Name
PhysRevLett.122.172502.pdf
Description
Published version
Size
291.34 KB
Format
Adobe PDF
Checksum (MD5)
c1c0e719da9b73aca0d2f67a2a9adfb9
Date Issued
2019
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2019 American Physical Society. We measured the triple coincidence A(e,e′np) and A(e,e′pp) reactions on carbon, aluminum, iron, and lead targets at Q2>1.5 (GeV/c)2, xB>1.1 and missing momentum >400 MeV/c. This was the first direct measurement of both proton-proton (pp) and neutron-proton (np) short-range correlated (SRC) pair knockout from heavy asymmetric nuclei. For all measured nuclei, the average proton-proton (pp) to neutron-proton (np) reduced cross-section ratio is about 6%, in agreement with previous indirect measurements. Correcting for single-charge exchange effects decreased the SRC pairs ratio to ∼3%, which is lower than previous results. Comparisons to theoretical generalized contact formalism (GCF) cross-section calculations show good agreement using both phenomenological and chiral nucleon-nucleon potentials, favoring a lower pp to np pair ratio. The ability of the GCF calculation to describe the experimental data using either phenomenological or chiral potentials suggests possible reduction of scale and scheme dependence in cross-section ratios. Our results also support the high-resolution description of high-momentum states being predominantly due to nucleons in SRC pairs.
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
10.1103/PHYSREVLETT.122.172502
