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510 GeV proton-proton collisionsさこ 隆志*; 谷田 聖; 他20名*
Proceedings of Science (Internet), 301, p.337_1 - 337_8, 2018/08
The Relativistic Heavy Ion Collider forward (RHICf) experiment has measured neutral particles produced in the very forward direction in the 510 GeV proton-proton collisions at RHIC in June 2017. The production cross sections of these particles are crucial to understand the hadronic interaction relevant to the air shower development at the cosmic-ray equivalent energy of 
eV, just below the energy of the knee. Together with the data at LHC, accelerator data can cover the interaction in the cosmic-ray energy of 10
eV to 10
eV. In addition, RHICf is able to improve the former measurements of single-spin asymmetry in the polarized proton-proton collisions that is sensitive to the fundamental process of the meson exchange. Common data taking with the STAR experiment will shed light on the unexplored low mass diffraction process.
dependence of forward particle productionさこ 隆志*; 谷田 聖; 他21名*
EPJ Web of Conferences, 145, p.10005_1 - 10005_4, 2017/06
The Relativistic Heavy Ion Collider forward experiment is ready to take data in the RHIC Run2017 
GeV 
- collisions using the LHCf Arm1 detector. New accelerator data are valuable to verify the Feynman scaling of 
production and to study the evolution of the break of scaling in neutron production. Using the transversely polarized proton beam, asymmetric production of forward neutrons is precisely measured. That is useful to understand the fundamental meson exchange in the proton-proton collisions.
