title: Arrangement of high-energy neutron irradiation field and shielding experiment using 4 m concrete at KENS.
abstract: An irradiation field of high-energy neutrons produced in the forward direction from a thick tungsten target bombarded by 500 MeV protons was arranged at the KENS spallation neutron source facility. In this facility, shielding experiment was performed with an ordinary concrete shield of 4 m thickness assembled in the irradiation room, 2.5 m downstream from the target centre. Activation detectors of bismuth, aluminium, indium and gold were inserted into eight slots inside the shield and attenuations of neutron reaction rates were obtained by measurements of gamma-rays from the activation detectors. A MARS14 Monte Carlo simulation was also performed down to thermal energy, and comparisons between the calculations and measurements show agreements within a factor of 3. This neutron field is useful for studies of shielding, activation and radiation damage of materials for high-energy neutrons, and experimental data are useful to check the accuracies of the transmission and activation calculation codes.
authors.affiliation: High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan. noriaki.nakao@kek.jp
authors.forename: N
authors.initials: N
authors.lastname: Nakao
authors.forename: H
authors.initials: H
authors.lastname: Yashima
authors.forename: M
authors.initials: M
authors.lastname: Kawai
authors.forename: K
authors.initials: K
authors.lastname: Oishi
authors.forename: H
authors.initials: H
authors.lastname: Nakashima
authors.forename: K
authors.initials: K
authors.lastname: Masumoto
authors.forename: H
authors.initials: H
authors.lastname: Matsumura
authors.forename: S
authors.initials: S
authors.lastname: Sasaki
authors.forename: M
authors.initials: M
authors.lastname: Numajiri
authors.forename: T
authors.initials: T
authors.lastname: Sanami
authors.forename: Q
authors.initials: Q
authors.lastname: Wang
authors.forename: A
authors.initials: A
authors.lastname: Toyoda
authors.forename: K
authors.initials: K
authors.lastname: Takahashi
authors.forename: K
authors.initials: K
authors.lastname: Iijima
authors.forename: K
authors.initials: K
authors.lastname: Eda
authors.forename: S
authors.initials: S
authors.lastname: Ban
authors.forename: H
authors.initials: H
authors.lastname: Hirayama
authors.forename: S
authors.initials: S
authors.lastname: Muto
authors.forename: T
authors.initials: T
authors.lastname: Nunomiya
authors.forename: S
authors.initials: S
authors.lastname: Yonai
authors.forename: D R H
authors.initials: DR
authors.lastname: Rasolonjatovo
authors.forename: K
authors.initials: K
authors.lastname: Terunuma
authors.forename: K
authors.initials: K
authors.lastname: Yamauchi
authors.forename: P K
authors.initials: PK
authors.lastname: Sarkar
authors.forename: E
authors.initials: E
authors.lastname: Kim
authors.forename: T
authors.initials: T
authors.lastname: Nakamura
authors.forename: A
authors.initials: A
authors.lastname: Maruhashi
mesh_terms: D003198:Computer Simulation; D003252:Construction Materials / Q000032:analysis*; D005214:Fast Neutrons; D007564:Japan; D018499:Linear Energy Transfer; D008422:Materials Testing / Q000379:methods; D015233:Models, Statistical; D009010:Monte Carlo Method; D010315:Particle Accelerators / Q000295:instrumentation*; D011829:Radiation Dosage; D011835:Radiation Protection / Q000295:instrumentation* / Q000379:methods*; D011874:Radiometry / Q000379:methods*; D012984:Software