Measurement of very forward neutron energy spectra for 7 TeV proton-proton collisions at the Large Hadron Collider

O. Adriani, E. Berti, L. Bonechi, M. Bongi, G. Castellini, R. D'Alessandro, M. Del Prete, M. Haguenauer, Y. Itow, K. Kasahara, K. Kawade, Y. Makino, K. Masuda, E. Matsubayashi, H. Menjo, G. Mitsuka, Y. Muraki, Y. Okuno, P. Papini, A. L. Perrot & 11 others S. Ricciarini, T. Sako, N. Sakurai, Y. Sugiura, T. Suzuki, T. Tamura, A. Tiberio, Shoji Torii, A. Tricomi, W. C. Turner, Q. D. Zhou

    Research output: Contribution to journalArticle

    29 Citations (Scopus)

    Abstract

    The Large Hadron Collider forward (LHCf) experiment is designed to use the LHC to verify the hadronic-interaction models used in cosmic-ray physics. Forward baryon production is one of the crucial points to understand the development of cosmic-ray showers. We report the neutron-energy spectra for LHC √s=7 TeV proton-proton collisions with the pseudo-rapidity η ranging from 8.81 to 8.99, from 8.99 to 9.22, and from 10.76 to infinity. The measured energy spectra obtained from the two independent calorimeters of Arm1 and Arm2 show the same characteristic feature before unfolding the detector responses. We unfolded the measured spectra by using the multidimensional unfolding method based on Bayesian theory, and the unfolded spectra were compared with current hadronic-interaction models. The QGSJET II-03 model predicts a high neutron production rate at the highest pseudo-rapidity range similar to our results, and the DPMJET 3.04 model describes our results well at the lower pseudo-rapidity ranges. However, no model perfectly explains the experimental results over the entire pseudo-rapidity range. The experimental data indicate a more abundant neutron production rate relative to the photon production than any model predictions studied here.

    Original languageEnglish
    Pages (from-to)360-366
    Number of pages7
    JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
    Volume750
    DOIs
    Publication statusPublished - 2015 Nov 12

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    neutron spectra
    energy spectra
    collisions
    protons
    neutrons
    cosmic ray showers
    infinity
    calorimeters
    cosmic rays
    baryons
    interactions
    physics
    detectors
    photons
    predictions

    Keywords

    • Forward neutron production
    • Hadronic-interaction model
    • LHC

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this

    Measurement of very forward neutron energy spectra for 7 TeV proton-proton collisions at the Large Hadron Collider. / Adriani, O.; Berti, E.; Bonechi, L.; Bongi, M.; Castellini, G.; D'Alessandro, R.; Del Prete, M.; Haguenauer, M.; Itow, Y.; Kasahara, K.; Kawade, K.; Makino, Y.; Masuda, K.; Matsubayashi, E.; Menjo, H.; Mitsuka, G.; Muraki, Y.; Okuno, Y.; Papini, P.; Perrot, A. L.; Ricciarini, S.; Sako, T.; Sakurai, N.; Sugiura, Y.; Suzuki, T.; Tamura, T.; Tiberio, A.; Torii, Shoji; Tricomi, A.; Turner, W. C.; Zhou, Q. D.

    In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 750, 12.11.2015, p. 360-366.

    Research output: Contribution to journalArticle

    Adriani, O, Berti, E, Bonechi, L, Bongi, M, Castellini, G, D'Alessandro, R, Del Prete, M, Haguenauer, M, Itow, Y, Kasahara, K, Kawade, K, Makino, Y, Masuda, K, Matsubayashi, E, Menjo, H, Mitsuka, G, Muraki, Y, Okuno, Y, Papini, P, Perrot, AL, Ricciarini, S, Sako, T, Sakurai, N, Sugiura, Y, Suzuki, T, Tamura, T, Tiberio, A, Torii, S, Tricomi, A, Turner, WC & Zhou, QD 2015, 'Measurement of very forward neutron energy spectra for 7 TeV proton-proton collisions at the Large Hadron Collider', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 750, pp. 360-366. https://doi.org/10.1016/j.physletb.2015.09.041
    Adriani, O. ; Berti, E. ; Bonechi, L. ; Bongi, M. ; Castellini, G. ; D'Alessandro, R. ; Del Prete, M. ; Haguenauer, M. ; Itow, Y. ; Kasahara, K. ; Kawade, K. ; Makino, Y. ; Masuda, K. ; Matsubayashi, E. ; Menjo, H. ; Mitsuka, G. ; Muraki, Y. ; Okuno, Y. ; Papini, P. ; Perrot, A. L. ; Ricciarini, S. ; Sako, T. ; Sakurai, N. ; Sugiura, Y. ; Suzuki, T. ; Tamura, T. ; Tiberio, A. ; Torii, Shoji ; Tricomi, A. ; Turner, W. C. ; Zhou, Q. D. / Measurement of very forward neutron energy spectra for 7 TeV proton-proton collisions at the Large Hadron Collider. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2015 ; Vol. 750. pp. 360-366.
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    title = "Measurement of very forward neutron energy spectra for 7 TeV proton-proton collisions at the Large Hadron Collider",
    abstract = "The Large Hadron Collider forward (LHCf) experiment is designed to use the LHC to verify the hadronic-interaction models used in cosmic-ray physics. Forward baryon production is one of the crucial points to understand the development of cosmic-ray showers. We report the neutron-energy spectra for LHC √s=7 TeV proton-proton collisions with the pseudo-rapidity η ranging from 8.81 to 8.99, from 8.99 to 9.22, and from 10.76 to infinity. The measured energy spectra obtained from the two independent calorimeters of Arm1 and Arm2 show the same characteristic feature before unfolding the detector responses. We unfolded the measured spectra by using the multidimensional unfolding method based on Bayesian theory, and the unfolded spectra were compared with current hadronic-interaction models. The QGSJET II-03 model predicts a high neutron production rate at the highest pseudo-rapidity range similar to our results, and the DPMJET 3.04 model describes our results well at the lower pseudo-rapidity ranges. However, no model perfectly explains the experimental results over the entire pseudo-rapidity range. The experimental data indicate a more abundant neutron production rate relative to the photon production than any model predictions studied here.",
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    T1 - Measurement of very forward neutron energy spectra for 7 TeV proton-proton collisions at the Large Hadron Collider

    AU - Adriani, O.

    AU - Berti, E.

    AU - Bonechi, L.

    AU - Bongi, M.

    AU - Castellini, G.

    AU - D'Alessandro, R.

    AU - Del Prete, M.

    AU - Haguenauer, M.

    AU - Itow, Y.

    AU - Kasahara, K.

    AU - Kawade, K.

    AU - Makino, Y.

    AU - Masuda, K.

    AU - Matsubayashi, E.

    AU - Menjo, H.

    AU - Mitsuka, G.

    AU - Muraki, Y.

    AU - Okuno, Y.

    AU - Papini, P.

    AU - Perrot, A. L.

    AU - Ricciarini, S.

    AU - Sako, T.

    AU - Sakurai, N.

    AU - Sugiura, Y.

    AU - Suzuki, T.

    AU - Tamura, T.

    AU - Tiberio, A.

    AU - Torii, Shoji

    AU - Tricomi, A.

    AU - Turner, W. C.

    AU - Zhou, Q. D.

    PY - 2015/11/12

    Y1 - 2015/11/12

    N2 - The Large Hadron Collider forward (LHCf) experiment is designed to use the LHC to verify the hadronic-interaction models used in cosmic-ray physics. Forward baryon production is one of the crucial points to understand the development of cosmic-ray showers. We report the neutron-energy spectra for LHC √s=7 TeV proton-proton collisions with the pseudo-rapidity η ranging from 8.81 to 8.99, from 8.99 to 9.22, and from 10.76 to infinity. The measured energy spectra obtained from the two independent calorimeters of Arm1 and Arm2 show the same characteristic feature before unfolding the detector responses. We unfolded the measured spectra by using the multidimensional unfolding method based on Bayesian theory, and the unfolded spectra were compared with current hadronic-interaction models. The QGSJET II-03 model predicts a high neutron production rate at the highest pseudo-rapidity range similar to our results, and the DPMJET 3.04 model describes our results well at the lower pseudo-rapidity ranges. However, no model perfectly explains the experimental results over the entire pseudo-rapidity range. The experimental data indicate a more abundant neutron production rate relative to the photon production than any model predictions studied here.

    AB - The Large Hadron Collider forward (LHCf) experiment is designed to use the LHC to verify the hadronic-interaction models used in cosmic-ray physics. Forward baryon production is one of the crucial points to understand the development of cosmic-ray showers. We report the neutron-energy spectra for LHC √s=7 TeV proton-proton collisions with the pseudo-rapidity η ranging from 8.81 to 8.99, from 8.99 to 9.22, and from 10.76 to infinity. The measured energy spectra obtained from the two independent calorimeters of Arm1 and Arm2 show the same characteristic feature before unfolding the detector responses. We unfolded the measured spectra by using the multidimensional unfolding method based on Bayesian theory, and the unfolded spectra were compared with current hadronic-interaction models. The QGSJET II-03 model predicts a high neutron production rate at the highest pseudo-rapidity range similar to our results, and the DPMJET 3.04 model describes our results well at the lower pseudo-rapidity ranges. However, no model perfectly explains the experimental results over the entire pseudo-rapidity range. The experimental data indicate a more abundant neutron production rate relative to the photon production than any model predictions studied here.

    KW - Forward neutron production

    KW - Hadronic-interaction model

    KW - LHC

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