Abstract
We measured the triple coincidence and reactions on carbon, aluminum, iron, and lead targets at , and missing momentum . This was the first direct measurement of both proton-proton () and neutron-proton () short-range correlated (SRC) pair knockout from heavy asymmetric nuclei. For all measured nuclei, the average proton-proton () to neutron-proton () 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 , 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 to 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.
- Received 5 November 2018
- Revised 11 March 2019
- Corrected 7 May 2019
DOI:https://doi.org/10.1103/PhysRevLett.122.172502
© 2019 American Physical Society
Physics Subject Headings (PhySH)
Corrections
7 May 2019
Correction: The name and affiliation of an author were missing in the original publication and have been inserted.