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Title: Direct Observation of Proton-Neutron Short-Range Correlation Dominance in Heavy Nuclei

Journal Article · · Physical Review Letters
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Here, 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 phenomeno- logical 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 poten- tials 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.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Old Dominion Univ., Norfolk, VA (United States); George Washington Univ., Washington, DC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); Israel Science Foundation (ISF); Chilean Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); Centre National de la Recherche Scientifique (CNRS); Commissariat a l’Energie Atomique (CEA); National Research Foundation of Korea (NRF); United Kingdom Science and Technology Facilities Council
Contributing Organization:
CLAS Collaboration
Grant/Contract Number:
AC05-06OR23177; AC02-06CH11357; FG02-96ER40960; SC0016583
OSTI ID:
1511825
Alternate ID(s):
OSTI ID: 1511097; OSTI ID: 1545768; OSTI ID: 1593824; OSTI ID: 1594378; OSTI ID: 1656763
Report Number(s):
JLAB-PHY-19-2926; DOE/OR/23177-4677; arXiv:1810.05343; PRLTAO
Journal Information:
Physical Review Letters, Vol. 122, Issue 17; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 66 works
Citation information provided by
Web of Science

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PANDA as midrapidity detector for a future HESR Collider at FAIR journal June 2020
PANDA as midrapidity detector for a future HESR Collider at FAIR text January 2020
PANDA as midrapidity detector for a future HESR Collider at FAIR text January 2020
Probing the core of the strong nuclear interaction text January 2020