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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 $Q$ 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.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Org.:
CLAS Collaboration
OSTI Identifier:
1511825
Alternate Identifier(s):
OSTI ID: 1511097
Report Number(s):
JLAB-PHY-19-2926; DOE/OR/23177-4677; arXiv:1810.05343
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:  
AC05-06OR23177
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 17; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Duer, M., Schmidt, A., Pybus, J. R., Segarra, E. P., Hrnjic, A., Denniston, A. W., Weiss, R., Hen, O., Piasetzky, E., Weinstein, L. B., Barnea, N., Korover, I., Cohen, E. O., Hakobyan, H., Adhikari, S., Angelini, Giovanni, Battaglieri, M., Beck, A., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Brooks, W., Burkert, V. D., Cao, F., Carman, D. S., Celentano, A., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., Cruz Torres, R., D’Angelo, A., Dashyan, N., De Sanctis, E., De Vita, R., Deur, A., Diehl, S., Djalali, C., Dupre, R., Duran, Burcu, Egiyan, H., El Alaoui, A., El Fassi, L., Eugenio, P., Filippi, A., Forest, T. A., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guo, L., Hafidi, K., Hanretty, C., Harrison, N., Hattawy, M., Hauenstein, F., Hayward, T. B., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jo, H. S., Joo, K., Kabir, M. L., Keller, D., Khachatryan, M., Khanal, A., Khandaker, M., Kim, W., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Lanza, L., Laskaris, G., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Markov, N., McKinnon, B., Mey-Tal Beck, S., Mirazita, M., Mokeev, V., Montgomery, R. A., Movsisyan, A., Munoz Camacho, C., Mustapha, B., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Patsyuk, M., Phelps, W., Pogorelko, O., Prok, Y., Protopopescu, D., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Schmookler, B. A., Schumacher, R. A., Sharabian, Y., Skorodumina, Iu., Sokhan, D., Sparveris, N., Stepanyan, S., Strauch, S., Taiuti, M., Tan, J. A., Tyler, N., Ungaro, M., Voskanyan, H., Voutier, E., Wang, R., Wei, X., Wood, M. H., Zachariou, N., Zhang, J., Zhao, Z. W., and Zheng, X. Direct Observation of Proton-Neutron Short-Range Correlation Dominance in Heavy Nuclei. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.172502.
Duer, M., Schmidt, A., Pybus, J. R., Segarra, E. P., Hrnjic, A., Denniston, A. W., Weiss, R., Hen, O., Piasetzky, E., Weinstein, L. B., Barnea, N., Korover, I., Cohen, E. O., Hakobyan, H., Adhikari, S., Angelini, Giovanni, Battaglieri, M., Beck, A., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Brooks, W., Burkert, V. D., Cao, F., Carman, D. S., Celentano, A., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., Cruz Torres, R., D’Angelo, A., Dashyan, N., De Sanctis, E., De Vita, R., Deur, A., Diehl, S., Djalali, C., Dupre, R., Duran, Burcu, Egiyan, H., El Alaoui, A., El Fassi, L., Eugenio, P., Filippi, A., Forest, T. A., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guo, L., Hafidi, K., Hanretty, C., Harrison, N., Hattawy, M., Hauenstein, F., Hayward, T. B., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jo, H. S., Joo, K., Kabir, M. L., Keller, D., Khachatryan, M., Khanal, A., Khandaker, M., Kim, W., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Lanza, L., Laskaris, G., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Markov, N., McKinnon, B., Mey-Tal Beck, S., Mirazita, M., Mokeev, V., Montgomery, R. A., Movsisyan, A., Munoz Camacho, C., Mustapha, B., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Patsyuk, M., Phelps, W., Pogorelko, O., Prok, Y., Protopopescu, D., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Schmookler, B. A., Schumacher, R. A., Sharabian, Y., Skorodumina, Iu., Sokhan, D., Sparveris, N., Stepanyan, S., Strauch, S., Taiuti, M., Tan, J. A., Tyler, N., Ungaro, M., Voskanyan, H., Voutier, E., Wang, R., Wei, X., Wood, M. H., Zachariou, N., Zhang, J., Zhao, Z. W., & Zheng, X. Direct Observation of Proton-Neutron Short-Range Correlation Dominance in Heavy Nuclei. United States. doi:10.1103/PhysRevLett.122.172502.
Duer, M., Schmidt, A., Pybus, J. R., Segarra, E. P., Hrnjic, A., Denniston, A. W., Weiss, R., Hen, O., Piasetzky, E., Weinstein, L. B., Barnea, N., Korover, I., Cohen, E. O., Hakobyan, H., Adhikari, S., Angelini, Giovanni, Battaglieri, M., Beck, A., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Brooks, W., Burkert, V. D., Cao, F., Carman, D. S., Celentano, A., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., Cruz Torres, R., D’Angelo, A., Dashyan, N., De Sanctis, E., De Vita, R., Deur, A., Diehl, S., Djalali, C., Dupre, R., Duran, Burcu, Egiyan, H., El Alaoui, A., El Fassi, L., Eugenio, P., Filippi, A., Forest, T. A., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guo, L., Hafidi, K., Hanretty, C., Harrison, N., Hattawy, M., Hauenstein, F., Hayward, T. B., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jo, H. S., Joo, K., Kabir, M. L., Keller, D., Khachatryan, M., Khanal, A., Khandaker, M., Kim, W., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Lanza, L., Laskaris, G., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Markov, N., McKinnon, B., Mey-Tal Beck, S., Mirazita, M., Mokeev, V., Montgomery, R. A., Movsisyan, A., Munoz Camacho, C., Mustapha, B., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Patsyuk, M., Phelps, W., Pogorelko, O., Prok, Y., Protopopescu, D., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Schmookler, B. A., Schumacher, R. A., Sharabian, Y., Skorodumina, Iu., Sokhan, D., Sparveris, N., Stepanyan, S., Strauch, S., Taiuti, M., Tan, J. A., Tyler, N., Ungaro, M., Voskanyan, H., Voutier, E., Wang, R., Wei, X., Wood, M. H., Zachariou, N., Zhang, J., Zhao, Z. W., and Zheng, X. Fri . "Direct Observation of Proton-Neutron Short-Range Correlation Dominance in Heavy Nuclei". United States. doi:10.1103/PhysRevLett.122.172502.
@article{osti_1511825,
title = {Direct Observation of Proton-Neutron Short-Range Correlation Dominance in Heavy Nuclei},
author = {Duer, M. and Schmidt, A. and Pybus, J. R. and Segarra, E. P. and Hrnjic, A. and Denniston, A. W. and Weiss, R. and Hen, O. and Piasetzky, E. and Weinstein, L. B. and Barnea, N. and Korover, I. and Cohen, E. O. and Hakobyan, H. and Adhikari, S. and Angelini, Giovanni and Battaglieri, M. and Beck, A. and Bedlinskiy, I. and Biselli, A. S. and Boiarinov, S. and Brooks, W. and Burkert, V. D. and Cao, F. and Carman, D. S. and Celentano, A. and Chetry, T. and Ciullo, G. and Clark, L. and Cole, P. L. and Contalbrigo, M. and Cortes, O. and Crede, V. and Cruz Torres, R. and D’Angelo, A. and Dashyan, N. and De Sanctis, E. and De Vita, R. and Deur, A. and Diehl, S. and Djalali, C. and Dupre, R. and Duran, Burcu and Egiyan, H. and El Alaoui, A. and El Fassi, L. and Eugenio, P. and Filippi, A. and Forest, T. A. and Gilfoyle, G. P. and Giovanetti, K. L. and Girod, F. X. and Golovatch, E. and Gothe, R. W. and Griffioen, K. A. and Guo, L. and Hafidi, K. and Hanretty, C. and Harrison, N. and Hattawy, M. and Hauenstein, F. and Hayward, T. B. and Heddle, D. and Hicks, K. and Holtrop, M. and Ilieva, Y. and Ireland, D. G. and Ishkhanov, B. S. and Isupov, E. L. and Jo, H. S. and Joo, K. and Kabir, M. L. and Keller, D. and Khachatryan, M. and Khanal, A. and Khandaker, M. and Kim, W. and Klein, F. J. and Kubarovsky, V. and Kuhn, S. E. and Lanza, L. and Laskaris, G. and Lenisa, P. and Livingston, K. and MacGregor, I. J. D. and Marchand, D. and Markov, N. and McKinnon, B. and Mey-Tal Beck, S. and Mirazita, M. and Mokeev, V. and Montgomery, R. A. and Movsisyan, A. and Munoz Camacho, C. and Mustapha, B. and Nadel-Turonski, P. and Niccolai, S. and Niculescu, G. and Osipenko, M. and Ostrovidov, A. I. and Paolone, M. and Paremuzyan, R. and Park, K. and Pasyuk, E. and Patsyuk, M. and Phelps, W. and Pogorelko, O. and Prok, Y. and Protopopescu, D. and Ripani, M. and Rizzo, A. and Rosner, G. and Rossi, P. and Sabatié, F. and Schmookler, B. A. and Schumacher, R. A. and Sharabian, Y. and Skorodumina, Iu. and Sokhan, D. and Sparveris, N. and Stepanyan, S. and Strauch, S. and Taiuti, M. and Tan, J. A. and Tyler, N. and Ungaro, M. and Voskanyan, H. and Voutier, E. and Wang, R. and Wei, X. and Wood, M. H. and Zachariou, N. and Zhang, J. and Zhao, Z. W. and Zheng, X.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.122.172502},
journal = {Physical Review Letters},
number = 17,
volume = 122,
place = {United States},
year = {2019},
month = {5}
}

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