Document Type
Report
Publication Date
2018
Pages
1-29
Abstract
Short-ranged correlated (SRC) nucleon-nucleon (NN) pairs account for about 20% of all nucleons in medium to heavy nuclei and about 75% of the nuclear kinetic energy. In addition, there is strong evidence linking these pairs to nucleon structure modification in nuclei (the EMC effect). A Significant amount of our knowledge of SRC pairs comes from hard two nucleon knockout measurements, conducted using electron (i.e. (e e'pp) and (e,e'pn)) and proton probes (i.e. (p, 2pn)). These studies show that almost all high-momentum nucleons belong to SRC pairs, that these pairs are predominantly pn pairs in all measured nuclei, that pair center-of-mass momentum distributions is small, and that increasing the neutron fraction increases the probability that a proton in the nucleus belongs to the correlated pair.
These discoveries were extracted from remarkably small data samples, containing only a few dozen to a few hundred (e, e'pN) events on each measured nucleus. There are many open questions in SRC studies that can only be addressed via high-statistics studies of selected nuclei. These include the existance and properties of Three-Nucleon SRCs, constraining the NN interaction and ab-initio calculations of the nuclear wave function at short distances, understanding factorized effective theories and effective SRC formation mechanisms, studies of three-nucleon correlations, and exploring the detailed connection of SRCs and the EMC effect. This proposal sets to address these and other outstanding issues by performing new measurements of SRCs using exclusive reactions at Hall B with the CLAS12 spectrometer. We expect an increase in statistics of x10 to x40 as compared to energies and the wide acceptance of CLAS12 provides an increased kinematical coverage, allowing for a 3N-SRC search in exclusive reactions, detailed studies of Q² and kinematical dependencies, as well as the mass-number (A) and nuclear asymmetry (N/Z) dependencies of SRCs.
We request 38 PAC days at Hall B using CLAS12 at with 4.4 GeV and 6.6 GeV beam energies on ²H, ⁴He, C, Si ⁴⁰, ⁴⁸Ca, Sn, and Pb.
Rights
© 2018 The Authors and Thomas Jefferson National Accelerator Facility. All rights reserved.
Included with permission of the author and in accordance with copyright holder's policy.
Original Publication Citation
Ashkenazy, A., Cruz Torres, R., Gilad, S., Hen, O., Laskaris, G., Papadopoulou, A., Patsyuk, M., Schmidt, A., Schmookler, B., Segarra, E. P., Hauenstein, F., Hattawy, M., Hyde, C., Khachatryan, M., Kuhn, S., Weinstein, L. B., Cohen, E. O., Duer, M., Piasetzky, E.,…Li, S. (2018). Exclusive studies of short range correlations in nuclei using CLAS12 proposal to Jefferson Lab PAC46 (Report No. PR12-18-003). Thomas Jefferson National Accelerator Facility.
ORCID
0000-0002-1265-2212 (Hauenstein), 0000-0003-2086-2807 (Hattawy), 0000-0001-7282-8120 (Hyde), 0000-0003-2243-6836 (Kuhn)
Repository Citation
Ashkenazy, A.; Cruz Torres, R.; Gilad, S.; Hen, O.; Laskaris, G.; Papadopoulou, A.; Patsyuk, M.; Schmidt, A.; Schmookler, B.; Segarra, E. P.; Hauenstein, F.; Hattawy, M.; Hyde, C.; Khachatryan, M.; Kuhn, S.; Weinstein, L. B.; Cohen, E. O.; Duer, M.; Piasetzky, E.; Higinbotham, D.; Stepanyan, S.; Szumila-Vance, H.; Wood, S. A.; Marshall, Christopher; Mahn, K.; Morrison, J.; Pickering, L.; Beck, A.; Korover, I.; Mey-Tal Beck, S.; El Alaoui, A.; Hakobian, H.; Mineeva, T.; Miller, J.; Brooks, W.; Betancourt, M.; Katori, T.; Balossino, I.; Watts, D.; Zana, L.; Ireland, D.; Sokhan, D.; Kalantarians, N.; and Li, S., "Exclusive Studiess of Short Range Correlations in Nuclei Using CLAS12 Proposal to Jefferson Lab PAC 46" (2018). Physics Faculty Publications. 906.
https://digitalcommons.odu.edu/physics_fac_pubs/906
Comments
A proposal of the CLAS12 Collaboration.