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. PerrotS. Ricciarini, T. Sako, N. Sakurai, Y. Sugiura, T. Suzuki, T. Tamura, A. Tiberio, Shoji Torii, A. Tricomi, W. C. Turner, Q. D. Zhou

*この研究の対応する著者

    研究成果: Article査読

    40 被引用数 (Scopus)

    抄録

    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.

    本文言語English
    ページ(範囲)360-366
    ページ数7
    ジャーナルPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
    750
    DOI
    出版ステータスPublished - 2015 11 12

    ASJC Scopus subject areas

    • 核物理学および高エネルギー物理学

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