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

M Duer¹, A Schmidt², J R Pybus², E P Segarra², A Hrnjic², A W Denniston², R Weiss³, O Hen², E Piasetzky¹, L B Weinstein⁴, N Barnea³, I Korover⁵, E O Cohen¹, H Hakobyan⁶, S Adhikari⁷, Giovanni Angelini⁸, M Battaglieri⁹, A Beck², I Bedlinskiy¹⁰, A S Biselli^{11

12}, S Boiarinov¹³, W Brooks⁶, V D Burkert¹³, F Cao¹⁴, D S Carman¹³, A Celentano⁹, T Chetry¹⁵, G Ciullo^{16

17}, L Clark¹⁸, P L Cole^{19

20

21}, M Contalbrigo¹⁷, O Cortes⁸, V Crede²², R Cruz Torres², A D'Angelo^{23

24}, N Dashyan²⁵, E De Sanctis²⁶, R De Vita⁹, A Deur¹³, S Diehl¹⁴, C Djalali^{15

27}, R Dupre²⁸, Burcu Duran²⁹, H Egiyan¹³, A El Alaoui⁶, L El Fassi³⁰, P Eugenio²², A Filippi³¹, T A Forest²⁰, G P Gilfoyle³², K L Giovanetti³³, F X Girod¹³, E Golovatch³⁴, R W Gothe²⁷, K A Griffioen³⁵, L Guo^{7

13}, K Hafidi^{36

25}, C Hanretty¹³, N Harrison¹³, M Hattawy⁴, F Hauenstein⁴, T B Hayward³⁵, D Heddle^{37

13}, K Hicks¹⁵, M Holtrop³⁸, Y Ilieva^{8

27}, D G Ireland¹⁸, B S Ishkhanov³⁴, E L Isupov³⁴, H S Jo³⁹, K Joo¹⁴, M L Kabir³⁰, D Keller⁴⁰, M Khachatryan⁴, A Khanal⁷, M Khandaker⁴¹, W Kim³⁹, F J Klein¹⁹, V Kubarovsky^{42

13}, S E Kuhn⁴, L Lanza²³, G Laskaris², P Lenisa¹⁷, K Livingston¹⁸, I J D MacGregor¹⁸, D Marchand²⁸, N Markov¹⁴, B McKinnon¹⁸, S Mey-Tal Beck², M Mirazita²⁶, V Mokeev^{34

13}, R A Montgomery¹⁸, A Movsisyan¹⁷, C Munoz Camacho²⁸, B Mustapha³⁶, P Nadel-Turonski¹³, S Niccolai²⁸, G Niculescu³³, M Osipenko⁹, A I Ostrovidov²², M Paolone²⁹, R Paremuzyan³⁸, K Park³⁹, E Pasyuk^{43

13}, M Patsyuk², W Phelps⁸, O Pogorelko¹⁰, Y Prok^{4

40}, D Protopopescu¹⁸, M Ripani⁹, A Rizzo^{23

24}, G Rosner¹⁸, P Rossi^{26

13}, F Sabatié⁴⁴, B A Schmookler², R A Schumacher¹¹, Y Sharabian¹³, Iu Skorodumina^{34

27}, D Sokhan¹⁸, N Sparveris²⁹, S Stepanyan¹³, S Strauch^{8

27}, M Taiuti^{9

45}, J A Tan³⁹, N Tyler²⁷, M Ungaro^{42

13}, H Voskanyan²⁵, E Voutier²⁸, R Wang²⁸, X Wei¹³, M H Wood^{46

27}, N Zachariou⁴⁷, J Zhang⁴⁰, Z W Zhao⁴⁸, X Zheng⁴⁰; CLAS Collaboration

Affiliations

¹ School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel.
² Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
³ The Racah Institute of Physics, The Hebrew University, Jerusalem, Israel.
⁴ Old Dominion University, Norfolk, Virginia 23529, USA.
⁵ Nuclear Research Centre Negev, Beer-Sheva, Israel.
⁶ Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile.
⁷ Florida International University, Miami, Florida 33199, USA.
⁸ The George Washington University, Washington, DC, 20052, USA.
⁹ INFN, Sezione di Genova, 16146 Genova, Italy.
¹⁰ Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia.
¹¹ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
¹² Fairfield University, Fairfield Connecticut 06824, USA.
¹³ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
¹⁴ University of Connecticut, Storrs, Connecticut 06269, USA.
¹⁵ Ohio University, Athens, Ohio 45701, USA.
¹⁶ Universita' di Ferrara, 44121 Ferrara, Italy.
¹⁷ INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
¹⁸ University of Glasgow, Glasgow G12 8QQ, United Kingdom.
¹⁹ Catholic University of America, Washington, DC, 20064, USA.
²⁰ Idaho State University, Pocatello, Idaho 83209, USA.
²¹ Lamar University, 4400 MLK Blvd, PO Box 10009, Beaumont, Texas 77710, USA.
²² Florida State University, Tallahassee, Florida 32306, USA.
²³ INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy.
²⁴ Universita' di Roma Tor Vergata, 00133 Rome, Italy.
²⁵ Yerevan Physics Institute, 375036 Yerevan, Armenia.
²⁶ INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy.
²⁷ University of South Carolina, Columbia, South Carolina 29208, USA.
²⁸ Institut de Physique Nucl'eaire, IN2P3-CNRS, Universit'e Paris-Sud, Universit'e Paris-Saclay, F-91406 Orsay, France.
²⁹ Temple University, Philadelphia, Pennsylvania 19122, USA.
³⁰ Mississippi State University, Mississippi State, Mississippi 39762-5167, USA.
³¹ INFN, Sezione di Torino, 10125 Torino, Italy.
³² University of Richmond, Richmond, Virginia 23173, USA.
³³ James Madison University, Harrisonburg, Virginia 22807, USA.
³⁴ Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia.
³⁵ College of William and Mary, Williamsburg, Virginia 23187-8795, USA.
³⁶ Argonne National Laboratory, Argonne, Illinois 60439, USA.
³⁷ Christopher Newport University, Newport News, Virginia 23606, USA.
³⁸ University of New Hampshire, Durham, New Hampshire 03824-3568, USA.
³⁹ Kyungpook National University, Daegu 41566, Republic of Korea.
⁴⁰ University of Virginia, Charlottesville, Virginia 22901, USA.
⁴¹ Norfolk State University, Norfolk, Virginia 23504, USA.
⁴² Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA.
⁴³ Arizona State University, Tempe, Arizona 85287-1504, USA.
⁴⁴ IRFU, CEA, Universit'e Paris-Saclay, F-91191 Gif-sur-Yvette, France.
⁴⁵ Universita di Genova, Dipartimento di Fisica, 16146 Genova, Italy.
⁴⁶ Canisius College, Buffalo, New York 14208, USA.
⁴⁷ University of York, York YO10, United Kingdom.
⁴⁸ Duke University, Durham, North Carolina 27708-0305, USA.

PMID: 31107086
DOI: 10.1103/PhysRevLett.122.172502

Free article

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

M Duer et al. Phys Rev Lett. 2019.

Free article

. 2019 May 3;122(17):172502.

doi: 10.1103/PhysRevLett.122.172502.

Authors

Affiliations

¹ School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel.
² Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
³ The Racah Institute of Physics, The Hebrew University, Jerusalem, Israel.
⁴ Old Dominion University, Norfolk, Virginia 23529, USA.
⁵ Nuclear Research Centre Negev, Beer-Sheva, Israel.
⁶ Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile.
⁷ Florida International University, Miami, Florida 33199, USA.
⁸ The George Washington University, Washington, DC, 20052, USA.
⁹ INFN, Sezione di Genova, 16146 Genova, Italy.
¹⁰ Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia.
¹¹ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
¹² Fairfield University, Fairfield Connecticut 06824, USA.
¹³ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
¹⁴ University of Connecticut, Storrs, Connecticut 06269, USA.
¹⁵ Ohio University, Athens, Ohio 45701, USA.
¹⁶ Universita' di Ferrara, 44121 Ferrara, Italy.
¹⁷ INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
¹⁸ University of Glasgow, Glasgow G12 8QQ, United Kingdom.
¹⁹ Catholic University of America, Washington, DC, 20064, USA.
²⁰ Idaho State University, Pocatello, Idaho 83209, USA.
²¹ Lamar University, 4400 MLK Blvd, PO Box 10009, Beaumont, Texas 77710, USA.
²² Florida State University, Tallahassee, Florida 32306, USA.
²³ INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy.
²⁴ Universita' di Roma Tor Vergata, 00133 Rome, Italy.
²⁵ Yerevan Physics Institute, 375036 Yerevan, Armenia.
²⁶ INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy.
²⁷ University of South Carolina, Columbia, South Carolina 29208, USA.
²⁸ Institut de Physique Nucl'eaire, IN2P3-CNRS, Universit'e Paris-Sud, Universit'e Paris-Saclay, F-91406 Orsay, France.
²⁹ Temple University, Philadelphia, Pennsylvania 19122, USA.
³⁰ Mississippi State University, Mississippi State, Mississippi 39762-5167, USA.
³¹ INFN, Sezione di Torino, 10125 Torino, Italy.
³² University of Richmond, Richmond, Virginia 23173, USA.
³³ James Madison University, Harrisonburg, Virginia 22807, USA.
³⁴ Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia.
³⁵ College of William and Mary, Williamsburg, Virginia 23187-8795, USA.
³⁶ Argonne National Laboratory, Argonne, Illinois 60439, USA.
³⁷ Christopher Newport University, Newport News, Virginia 23606, USA.
³⁸ University of New Hampshire, Durham, New Hampshire 03824-3568, USA.
³⁹ Kyungpook National University, Daegu 41566, Republic of Korea.
⁴⁰ University of Virginia, Charlottesville, Virginia 22901, USA.
⁴¹ Norfolk State University, Norfolk, Virginia 23504, USA.
⁴² Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA.
⁴³ Arizona State University, Tempe, Arizona 85287-1504, USA.
⁴⁴ IRFU, CEA, Universit'e Paris-Saclay, F-91191 Gif-sur-Yvette, France.
⁴⁵ Universita di Genova, Dipartimento di Fisica, 16146 Genova, Italy.
⁴⁶ Canisius College, Buffalo, New York 14208, USA.
⁴⁷ University of York, York YO10, United Kingdom.
⁴⁸ Duke University, Durham, North Carolina 27708-0305, USA.

PMID: 31107086
DOI: 10.1103/PhysRevLett.122.172502

Abstract

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

Affiliations

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

Authors

Affiliations

Abstract

LinkOut - more resources

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