Measurements of secondary neutrons produced from thick targets bombarded by high-energy helium and carbon ions

被引:95
作者
Kurosawa, T [1 ]
Nakao, N
Nakamura, T
Uwamino, Y
Shibata, T
Nakanishi, N
Fukumura, A
Murakami, K
机构
[1] Tohoku Univ, Ctr Cyclotron & Radioisotope, Aoba Ku, Sendai, Miyagi 9808578, Japan
[2] High Energy Accelerator Res Org, Tanashi Branch, Tanashi, Tokyo 1888501, Japan
[3] Inst Phys & Chem Res, Wako, Saitama 3510198, Japan
[4] Natl Inst Radiol Sci, Inage Ku, Chiba 2638555, Japan
关键词
D O I
10.13182/NSE98-53
中图分类号
TL [原子能技术]; O571 [原子核物理学];
学科分类号
0827 ; 082701 ;
摘要
The angular and energy distributions of neutrons produced by 100 and 180 MeV/nucleon He and 100 180 and 400 MeV/nucleon C ions stopping in thick C, Al, Cu, and Pb targets were measured wing the Heavy-Ion Medical Accelerator in Chiba of the National Institute of Radiological Science (NIRS), Japan. The neutron spectra in the forward direction have Broad peaks of similar to 60 to 70% of the incident particle energy per nucleon due to the break-rep process, and they spread up to almost twice the projectile energy per nucleon. The neutron spectra are similar for the same incident energy of 100 MeV/nucleon for both He and C ions. The phenomenological hybrid analysis, based on the moving source model and the Gaussian fitting of the break-lip process, could well represent the measured thick target neutron spectra. The experimental results are also compared with the calculations using the heavy-ion code, and the calculated results agree with the measured results within a factor of 2 margin of accuracy. This systematic study on neutron production from thick targets by high-energy heavy ions is the first experimental work performed by NIRS and will be useful for designing the shielding for the high-energy heavy-ion accelerator facility.
引用
收藏
页码:30 / 57
页数:28
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