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

被引：50

作者：

Adriani, O. ^{[1
,2
]}

Berti, E. ^{[1
,2
]}

Bonechi, L. ^{[1
]}

Bongi, M. ^{[1
,2
]}

Castellini, G. ^{[1
,3
]}

D'Alessandro, R. ^{[1
,2
]}

Del Prete, M. ^{[1
,2
]}

Haguenauer, M. ^{[4
]}

Itow, Y. ^{[5
,6
]}

Kasahara, K. ^{[7
]}

Kawade, K. ^{[5
]}

Makino, Y. ^{[5
]}

Masuda, K. ^{[5
]}

Matsubayashi, E. ^{[5
]}

Menjo, H. ^{[8
]}

Mitsuka, G. ^{[2
]}

Muraki, Y. ^{[5
]}

Okuno, Y. ^{[5
]}

Papini, P. ^{[1
]}

Perrot, A. -L. ^{[9
]}

Ricciarini, S. ^{[1
,3
]}

Sako, T. ^{[5
,6
]}

Sakurai, N. ^{[6
]}

Sugiura, Y. ^{[5
]}

Suzuki, T. ^{[7
]}

Tamura, T. ^{[10
]}

Tiberio, A. ^{[1
,2
]}

Torii, S. ^{[7
]}

Tricomi, A. ^{[11
,12
]}

Turner, W. C. ^{[13
]}

Zhou, Q. D. ^{[5
]}

机构：

[1] Ist Nazl Fis Nucl, Sect Florence, Florence, Italy

[2] Univ Florence, I-50121 Florence, Italy

[3] IFAC CNR, Naples, Italy

[4] Ecole Polytech, F-91128 Palaiseau, France

[5] Nagoya Univ, Solar Terr Environm Lab, Nagoya, Aichi 4648601, Japan

[6] Nagoya Univ, Kobayashi Maskawa Inst Origin Particles & Univers, Nagoya, Aichi 4648601, Japan

[7] Waseda Univ, RISE, Tokyo, Japan

[8] Nagoya Univ, Grad Sch Sci, Nagoya, Aichi 4648601, Japan

[9] CERN, CH-1211 Geneva 23, Switzerland

[10] Kanagawa Univ, Yokohama, Kanagawa, Japan

[11] Ist Nazl Fis Nucl, Sect Catania, Catania, Italy

[12] Univ Catania, I-95124 Catania, Italy

[13] LBNL, Berkeley, CA USA

来源：

PHYSICS LETTERS B | 2015年 / 750卷

关键词：

LHC; Forward neutron production; Hadronic-interaction model; ISR;

D O I：

10.1016/j.physletb.2015.09.041

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 root s = 7 TeV proton-proton collisions with the pseudo-rapidity eta 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. (C) 2015 The Authors. Published by Elsevier B.V.

引用

页码：360 / 366

页数：7

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