A comprehensive study of cosmic ray air showers and hadronic interactions by very forward measurement at LHC

2014 Fiscal Year Final Research Report

• Project/Area Number: 23244050
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Nagoya University
• Principal Investigator: ITOW Yoshitaka 名古屋大学, 太陽地球環境研究所, 教授 (50272521)
• Co-Investigator(Kenkyū-buntansha): MASUDA Kimiaki 名古屋大学, 太陽地球環境研究所, 准教授 (40173744) ; SAKO Takashi 名古屋大学, 太陽地球環境研究所, 助教 (90324368)
• Research Collaborator: MENJO Hiroaki 名古屋大学, 理学研究科, 特任助教 ; MITSUKA Gaku 名古屋大学, 太陽地球環境研究所, 特任助教
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: 宇宙線 / 加速器実験 / 国際協力 / 素粒子実験 / 実験核物理 / LHCf実験 / CERN / LHC

Outline of Final Research Achievements

We have performed the LHCf experiment for measurements for very forward particle productions, which are relevant for understanding of air shower development and its implication for high energy cosmic ray measurements, by using small dedicated detectors at LHC. The results for very forward energy spectra of gamma rays, neutral pions and neutrons from root-s = 0.9 TeV and 7 TeV pp collisions and root-s = 5.02 TeV/n p-Pb collisions were obtained and compared with various hadronic interaction models commonly used for cosmic ray air shower simulations. We found any interaction models could not reproduce the observed spectra perfectly. We have also developed a new high-radiation-hard detector utilizing GSO scintillator for the purpose of coming LHC runs at root-s = 13 TeV collisions.

Free Research Field

宇宙線物理学