Backward emitted high-energy neutrons in hard reactions of p and [Formula Presented] on carbon

A. Malki, J. Alster, G. Asryan, Y. Averichev, D. Barton, V. Baturin, N. Bukhtoyarova, A. Carroll, Steven Heppelmann, T. Kawabata, A. Leksanov, Y. Makdisi, E. Minina, I. Navon, H. Nicholson, A. Ogawa, Yu Panebratsev, E. Piasetzky, A. Schetkovsky, S. Shimanskiy & 4 others A. Tang, J. W. Watson, H. Yoshida, D. Zhalov

Research output: Contribution to journalArticle

Abstract

Beams of protons and pions of [Formula Presented] were incident on a C target. Neutrons emitted into the backward hemisphere, in the laboratory system, were detected in (triple) coincidence with two emerging particles of tranverse momenta [Formula Presented] We determined that for [Formula Presented] of the proton-induced events and for [Formula Presented] of the pion-induced events with the two high-[Formula Presented] particles, there is also at least one backward emitted neutron with momentum greater than [Formula Presented] This observation is in sharp contrast to a well- established universal pattern from a large variety of earlier inclusive measurements with hadrons, electrons, photons, neutrinos, and antineutrinos where the probability for backward nucleon emission was in the 5 to [Formula Presented] range. We present also a measurement of the momentum spectra for the backward going neutrons. The spectra have the same universal shape observed in the inclusive reactions. We speculate that the enhanced backward neutron emission in this semi-inclusive region could be an indication for a strong dependence of the cross section on the squared total center-of-mass energy (s) and for the importance of short-range nucleon-nucleon correlations.

Original languageEnglish (US)
Number of pages1
JournalPhysical Review C - Nuclear Physics
Volume65
Issue number1
DOIs
StatePublished - Jan 1 2002

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neutrons
carbon
energy
momentum
pions
neutron emission
antineutrinos
protons
hemispheres
hadrons
center of mass
emerging
indication
neutrinos
cross sections
photons
electrons

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Malki, A. ; Alster, J. ; Asryan, G. ; Averichev, Y. ; Barton, D. ; Baturin, V. ; Bukhtoyarova, N. ; Carroll, A. ; Heppelmann, Steven ; Kawabata, T. ; Leksanov, A. ; Makdisi, Y. ; Minina, E. ; Navon, I. ; Nicholson, H. ; Ogawa, A. ; Panebratsev, Yu ; Piasetzky, E. ; Schetkovsky, A. ; Shimanskiy, S. ; Tang, A. ; Watson, J. W. ; Yoshida, H. ; Zhalov, D. / Backward emitted high-energy neutrons in hard reactions of p and [Formula Presented] on carbon. In: Physical Review C - Nuclear Physics. 2002 ; Vol. 65, No. 1.
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abstract = "Beams of protons and pions of [Formula Presented] were incident on a C target. Neutrons emitted into the backward hemisphere, in the laboratory system, were detected in (triple) coincidence with two emerging particles of tranverse momenta [Formula Presented] We determined that for [Formula Presented] of the proton-induced events and for [Formula Presented] of the pion-induced events with the two high-[Formula Presented] particles, there is also at least one backward emitted neutron with momentum greater than [Formula Presented] This observation is in sharp contrast to a well- established universal pattern from a large variety of earlier inclusive measurements with hadrons, electrons, photons, neutrinos, and antineutrinos where the probability for backward nucleon emission was in the 5 to [Formula Presented] range. We present also a measurement of the momentum spectra for the backward going neutrons. The spectra have the same universal shape observed in the inclusive reactions. We speculate that the enhanced backward neutron emission in this semi-inclusive region could be an indication for a strong dependence of the cross section on the squared total center-of-mass energy (s) and for the importance of short-range nucleon-nucleon correlations.",
author = "A. Malki and J. Alster and G. Asryan and Y. Averichev and D. Barton and V. Baturin and N. Bukhtoyarova and A. Carroll and Steven Heppelmann and T. Kawabata and A. Leksanov and Y. Makdisi and E. Minina and I. Navon and H. Nicholson and A. Ogawa and Yu Panebratsev and E. Piasetzky and A. Schetkovsky and S. Shimanskiy and A. Tang and Watson, {J. W.} and H. Yoshida and D. Zhalov",
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Malki, A, Alster, J, Asryan, G, Averichev, Y, Barton, D, Baturin, V, Bukhtoyarova, N, Carroll, A, Heppelmann, S, Kawabata, T, Leksanov, A, Makdisi, Y, Minina, E, Navon, I, Nicholson, H, Ogawa, A, Panebratsev, Y, Piasetzky, E, Schetkovsky, A, Shimanskiy, S, Tang, A, Watson, JW, Yoshida, H & Zhalov, D 2002, 'Backward emitted high-energy neutrons in hard reactions of p and [Formula Presented] on carbon', Physical Review C - Nuclear Physics, vol. 65, no. 1. https://doi.org/10.1103/PhysRevC.65.015207

Backward emitted high-energy neutrons in hard reactions of p and [Formula Presented] on carbon. / Malki, A.; Alster, J.; Asryan, G.; Averichev, Y.; Barton, D.; Baturin, V.; Bukhtoyarova, N.; Carroll, A.; Heppelmann, Steven; Kawabata, T.; Leksanov, A.; Makdisi, Y.; Minina, E.; Navon, I.; Nicholson, H.; Ogawa, A.; Panebratsev, Yu; Piasetzky, E.; Schetkovsky, A.; Shimanskiy, S.; Tang, A.; Watson, J. W.; Yoshida, H.; Zhalov, D.

In: Physical Review C - Nuclear Physics, Vol. 65, No. 1, 01.01.2002.

Research output: Contribution to journalArticle

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T1 - Backward emitted high-energy neutrons in hard reactions of p and [Formula Presented] on carbon

AU - Malki, A.

AU - Alster, J.

AU - Asryan, G.

AU - Averichev, Y.

AU - Barton, D.

AU - Baturin, V.

AU - Bukhtoyarova, N.

AU - Carroll, A.

AU - Heppelmann, Steven

AU - Kawabata, T.

AU - Leksanov, A.

AU - Makdisi, Y.

AU - Minina, E.

AU - Navon, I.

AU - Nicholson, H.

AU - Ogawa, A.

AU - Panebratsev, Yu

AU - Piasetzky, E.

AU - Schetkovsky, A.

AU - Shimanskiy, S.

AU - Tang, A.

AU - Watson, J. W.

AU - Yoshida, H.

AU - Zhalov, D.

PY - 2002/1/1

Y1 - 2002/1/1

N2 - Beams of protons and pions of [Formula Presented] were incident on a C target. Neutrons emitted into the backward hemisphere, in the laboratory system, were detected in (triple) coincidence with two emerging particles of tranverse momenta [Formula Presented] We determined that for [Formula Presented] of the proton-induced events and for [Formula Presented] of the pion-induced events with the two high-[Formula Presented] particles, there is also at least one backward emitted neutron with momentum greater than [Formula Presented] This observation is in sharp contrast to a well- established universal pattern from a large variety of earlier inclusive measurements with hadrons, electrons, photons, neutrinos, and antineutrinos where the probability for backward nucleon emission was in the 5 to [Formula Presented] range. We present also a measurement of the momentum spectra for the backward going neutrons. The spectra have the same universal shape observed in the inclusive reactions. We speculate that the enhanced backward neutron emission in this semi-inclusive region could be an indication for a strong dependence of the cross section on the squared total center-of-mass energy (s) and for the importance of short-range nucleon-nucleon correlations.

AB - Beams of protons and pions of [Formula Presented] were incident on a C target. Neutrons emitted into the backward hemisphere, in the laboratory system, were detected in (triple) coincidence with two emerging particles of tranverse momenta [Formula Presented] We determined that for [Formula Presented] of the proton-induced events and for [Formula Presented] of the pion-induced events with the two high-[Formula Presented] particles, there is also at least one backward emitted neutron with momentum greater than [Formula Presented] This observation is in sharp contrast to a well- established universal pattern from a large variety of earlier inclusive measurements with hadrons, electrons, photons, neutrinos, and antineutrinos where the probability for backward nucleon emission was in the 5 to [Formula Presented] range. We present also a measurement of the momentum spectra for the backward going neutrons. The spectra have the same universal shape observed in the inclusive reactions. We speculate that the enhanced backward neutron emission in this semi-inclusive region could be an indication for a strong dependence of the cross section on the squared total center-of-mass energy (s) and for the importance of short-range nucleon-nucleon correlations.

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