@article{6b8a4d11bae24767aeb8df32ac1ab137,
title = "Direct Observation of Proton-Neutron Short-Range Correlation Dominance in Heavy Nuclei",
abstract = "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.",
author = "{(CLAS Collaboration)} and M. Duer and A. Schmidt and Pybus, {J. R.} and Segarra, {E. P.} and A. Hrnjic and Denniston, {A. W.} and R. Weiss and O. Hen and E. Piasetzky and Weinstein, {L. B.} and N. Barnea and I. Korover and Cohen, {E. O.} and H. Hakobyan and S. Adhikari and Giovanni Angelini and M. Battaglieri and A. Beck and I. Bedlinskiy and Biselli, {A. S.} and S. Boiarinov and W. Brooks and Burkert, {V. D.} and F. Cao and Carman, {D. S.} and A. Celentano and T. Chetry and G. Ciullo and L. Clark and Cole, {P. L.} and M. Contalbrigo and O. Cortes and V. Crede and {Cruz Torres}, R. and A. D'Angelo and N. Dashyan and {De Sanctis}, E. and {De Vita}, R. and A. Deur and S. Diehl and C. Djalali and R. Dupre and Burcu Duran and H. Egiyan and {El Alaoui}, A. and {El Fassi}, L. and P. Eugenio and A. Filippi and Forest, {T. A.} and Gilfoyle, {G. P.}",
note = "Publisher Copyright: {\textcopyright} 2019 American Physical Society.",
year = "2019",
month = may,
day = "3",
doi = "10.1103/PhysRevLett.122.172502",
language = "אנגלית",
volume = "122",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "17",
}