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Hiroshi Yashima,Norihiro Matsuda,Yoshimi Kasugai,Hiroshi Nakashima,Yukio Sakamoto,Hiroshi Matsumura,Hiroshi Iwase,Norikazu Kinoshita,David Boehnlein,Gary Lautenschlager,Anthony Leveling,Nikolai Mokhov 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The JASMIN Collaboration has performed an experiment to conduct measurements of nuclear reaction rates around the anti-proton production (Pbar) target at the Fermi National Accelerator Laboratory (FNAL). At the Pbar target station, the target, consisting an Inconel 600 cylinder, was irradiated by a 120 GeV/c proton beam from the FNAL Main Injector. The beam intensity was 3.6 X 10^(12) protons per second. Samples of Al, Nb, Cu, and Au were placed near the target to investigate the spatial and energy distribution of secondary particles emitted from it. After irradiation, the induced activities of the samples were measured by studying their gamma ray spectra using HPGe detectors. The production rates of 30 nuclides induced in Al, Nb, Cu, Au samples were obtained. These rates increase for samples placed in a forward (small angle) position relative to the target. The angular dependence of these reaction rates becomes larger for increasing threshold energy. These experimental results are compared with Monte Carlo calculations. The calculated results generally agree with the experimental results to within a factor of 2 to 3.
Hiroshi Matsumura,Norikazu Kinoshita,Hiroshi Iwase,Akihiro Toyoda,Yoshimi Kasugai,Norihiro Matsuda,Yukio Sakamoto,Hiroshi Nakashima,Hiroshi Yashima,Nikolai Mokhov,Anthony Leveling,David Boehnlein,Kamr 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
In an antiproton production (Pbar) target station of the Fermi National Accelerator Laboratory (FNAL), the secondary particles produced by bombarding a target with 120-GeV protons are shielded by a thick iron shield. In order to obtain experimental data on high-energy neutron transport at more than 100-GeV-proton accelerator facilities, we indirectly measured more than 100-MeV neutrons at the outside of the iron shield at an angle of 50˚ in the Pbar target station. The measurement was performed by using the Au activation method coupled with a low-background γ-ray counting system. As an indicator for the neutron flux, we determined the production rates of 8 spallation nuclides (^(196)Au, ^(188)Pt, ^(189)Ir, ^(185)Os, ^(175)Hf, ^(173)Lu, ^(171)Lu, and ^(169)Yb) in the Au activation detector. The measured production rates were compared with the theoretical production rates calculated using PHITS. We proved that the Au activation method can serve as a powerful tool for indirect measurements of more than100-MeV neutrons that play a vital role in neutron transport. These results will be important for clarifying the problems in theoretical calculations of high-energy neutron transport.
Neutron Energy Spectra at 180˚ from 140 MeV Proton Incident Reactions
Yosuke Iwamoto,Daiki Satoh,Yoshihiro Nakane,Hiroshi Nakashima,Akira Endo,Yukio Sakamoto 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The neutron energy spectra of carbon, iron, and gold targets with 140 MeV protons at 180˚ were measured at the RCNP cyclotron facility using the time-of-flight technique. The results were compared with results calculated using the evaluated nuclear data file (the LA150 library) and the intranuclear cascade models (JAM and JQMD) implemented in the PHITS code. The results using LA150 and JQMD generally agreed with the experimental data except for the carbon target, but the JAM could not reproduce high-energy neutrons above .