Direct Observation of Proton-Neutron Short-Range Correlation Dominance in Heavy Nuclei
M. DuerSchool of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, IsraelA. SchmidtMassachusetts Institute of Technology, Cambridge, Massachusetts 02139, USAJ.R. PybusMassachusetts Institute of Technology, Cambridge, Massachusetts 02139, USAE. P. SegarraMassachusetts Institute of Technology, Cambridge, Massachusetts 02139, USAA. HrnjicMassachusetts Institute of Technology, Cambridge, Massachusetts 02139, USAA. DennistonMassachusetts Institute of Technology, Cambridge, Massachusetts 02139, USAR. WeissThe Racah Institute of Physics, The Hebrew University, Jerusalem, IsraelO. HenMassachusetts Institute of Technology, Cambridge, Massachusetts 02139, USAE. PiasetzkySchool of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, IsraelL. B. WeinsteinOld Dominion University, Norfolk, Virginia 23529, USANir BarneaThe Racah Institute of Physics, The Hebrew University, Jerusalem, IsraelI. KoroverE. O. CohenSchool of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, IsraelH. HakobyanUniversidad Técnica Federico Santa María, Casilla 110-V Valparaíso, ChileS. AdhikariFlorida International University, Miami, Florida 33199, USAGiovanni AngeliniThe George Washington University, Washington, DC, 20052, USAM. BattaglieriINFN, Sezione di Genova, 16146 Genova, ItalyA. BeckMassachusetts Institute of Technology, Cambridge, Massachusetts 02139, USAI. BedlinskiyInstitute of Theoretical and Experimental Physics, Moscow, 117259, RussiaA. S. BiselliCarnegie Mellon University, Pittsburgh, Pennsylvania 15213, USAS. BoiarinovThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAW. K. BrooksUniversidad Técnica Federico Santa María, Casilla 110-V Valparaíso, ChileV. D. BurkertThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAF. CaoUniversity of Connecticut, Storrs, Connecticut 06269, USAD. S. CarmanThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAA. CelentanoINFN, Sezione di Genova, 16146 Genova, ItalyT. ChetryOhio University, Athens, Ohio 45701, USAG. CiulloINFN, Sezione di Ferrara, 44100 Ferrara, ItalyL. ClarkUniversity of Glasgow, Glasgow G12 8QQ, United KingdomP. L. ColeCatholic University of America, Washington, DC, 20064, USAM. ContalbrigoINFN, Sezione di Ferrara, 44100 Ferrara, ItalyO. CortesThe George Washington University, Washington, DC, 20052, USAV. CredeFlorida State University, Tallahassee, Florida 32306, USAR. Cruz TorresMassachusetts Institute of Technology, Cambridge, Massachusetts 02139, USAA. D’AngeloINFN, Sezione di Roma Tor Vergata, 00133 Rome, ItalyN. DashyanYerevan Physics Institute, 375036 Yerevan, ArmeniaE. De SanctisINFN, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyR. De VitaINFN, Sezione di Genova, 16146 Genova, ItalyA. DeurThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAS. DiehlUniversity of Connecticut, Storrs, Connecticut 06269, USAC. DjalaliOhio University, Athens, Ohio 45701, USAR. DupreInstitut de Physique Nucl'eaire, IN2P3-CNRS, Universit'e Paris-Sud, Universit'e Paris-Saclay, F-91406 Orsay, FranceB. DuranTemple University, Philadelphia, Pennsylvania 19122, USAH. EgiyanThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAA. El AlaouiUniversidad Técnica Federico Santa María, Casilla 110-V Valparaíso, ChileL. El FassiMississippi State University, Mississippi State, Mississippi 39762-5167, USAP. EugenioFlorida State University, Tallahassee, Florida 32306, USAA. FilippiINFN, Sezione di Torino, 10125 Torino, ItalyT. A. ForestIdaho State University, Pocatello, Idaho 83209, USAG. P. GilfoyleUniversity of Richmond, Richmond, Virginia 23173, USAK. L. GiovanettiJames Madison University, Harrisonburg, Virginia 22807, USAF. X. GirodThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAE. GolovatchSkobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, RussiaR. W. GotheUniversity of South Carolina, Columbia, South Carolina 29208, USAK. A. GriffioenCollege of William and Mary, Williamsburg, Virginia 23187-8795, USAL. GuoFlorida International University, Miami, Florida 33199, USAK. HafidiArgonne National Laboratory, Argonne, Illinois 60439, USAC. HanrettyThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAN. HarrisonThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAM. HattawyOld Dominion University, Norfolk, Virginia 23529, USAF. HauensteinOld Dominion University, Norfolk, Virginia 23529, USAT. B. HaywardCollege of William and Mary, Williamsburg, Virginia 23187-8795, USAD. HeddleChristopher Newport University, Newport News, Virginia 23606, USAK. HicksOhio University, Athens, Ohio 45701, USAM. HoltropUniversity of New Hampshire, Durham, New Hampshire 03824-3568, USAY. IlievaThe George Washington University, Washington, DC, 20052, USAD. G. IrelandUniversity of Glasgow, Glasgow G12 8QQ, United KingdomB. S. IshkhanovSkobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, RussiaE. L. IsupovSkobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, RussiaH. S. JoKyungpook National University, Daegu 41566, Republic of KoreaK. JooUniversity of Connecticut, Storrs, Connecticut 06269, USAM. L. KabirMississippi State University, Mississippi State, Mississippi 39762-5167, USAD. KellerUniversity of Virginia, Charlottesville, Virginia 22901, USAM. KhachatryanOld Dominion University, Norfolk, Virginia 23529, USAA. KhanalFlorida International University, Miami, Florida 33199, USAMayeen Uddin KhandakerNorfolk State University, Norfolk, Virginia 23504, USAW. KimKyungpook National University, Daegu 41566, Republic of KoreaF. J. KleinCatholic University of America, Washington, DC, 20064, USAV. KubarovskyRensselaer Polytechnic Institute, Troy, New York 12180-3590, USAS. E. KuhnOld Dominion University, Norfolk, Virginia 23529, USAL. LanzaINFN, Sezione di Roma Tor Vergata, 00133 Rome, ItalyG. LaskarisMassachusetts Institute of Technology, Cambridge, Massachusetts 02139, USAP. LenisaINFN, Sezione di Ferrara, 44100 Ferrara, ItalyK. LivingstonUniversity of Glasgow, Glasgow G12 8QQ, United KingdomI. J. D. MacGregorUniversity of Glasgow, Glasgow G12 8QQ, United KingdomD. MarchandInstitut de Physique Nucl'eaire, IN2P3-CNRS, Universit'e Paris-Sud, Universit'e Paris-Saclay, F-91406 Orsay, FranceN. MarkovUniversity of Connecticut, Storrs, Connecticut 06269, USAB. McKinnonUniversity of Glasgow, Glasgow G12 8QQ, United KingdomS. Mey-Tal BeckMassachusetts Institute of Technology, Cambridge, Massachusetts 02139, USAM. MirazitaINFN, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyV. MokeevSkobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, RussiaR. A. MontgomeryUniversity of Glasgow, Glasgow G12 8QQ, United KingdomA. MovsisyanINFN, Sezione di Ferrara, 44100 Ferrara, ItalyC. Munoz CamachoInstitut de Physique Nucl'eaire, IN2P3-CNRS, Universit'e Paris-Sud, Universit'e Paris-Saclay, F-91406 Orsay, FranceB. MustaphaArgonne National Laboratory, Argonne, Illinois 60439, USAP. Nadel-TurońskiThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAS. NiccolaiInstitut de Physique Nucl'eaire, IN2P3-CNRS, Universit'e Paris-Sud, Universit'e Paris-Saclay, F-91406 Orsay, FranceG. NiculescuJames Madison University, Harrisonburg, Virginia 22807, USAM. OsipenkoINFN, Sezione di Genova, 16146 Genova, ItalyA. OstrovidovFlorida State University, Tallahassee, Florida 32306, USA
2019en
ABI
Аннотация
We measured the triple coincidence A(e,e^{'}np) and A(e,e^{'}pp) reactions on carbon, aluminum, iron, and lead targets at Q^{2}>1.5 (GeV/c)^{2}, x_{B}>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.
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