外国特許コード F190009746
整理番号 S2017-0910-C0
掲載日 2019年5月7日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2018JP025943
国際公開番号 WO 2019017233
国際出願日 平成30年7月10日(2018.7.10)
国際公開日 平成31年1月24日(2019.1.24)
  • 特願2017-140192 (2017.7.19) JP
発明の概要(英語) According to the present invention, provided are a neutron optical element that concentrates neutron beams with high efficiency, and a neutron source of high strength obtained by using the same. A straight line (dashed lines N1-N5 in the drawing that correspond to neutron beams) passing through each of openings (21A) (upstream-side openings) on an upstream side and each of openings (22A) (downstream-side openings) on a downstream side that correspond to the openings (21A) is configured to pass through a light-converging point (F) set at the rear of a neutron optical element (20). Among thermal neutrons which are diffused and radiated backward from the entire surface of a neutron moderator (12), only thermal neutrons toward the light-converging point (F) are extracted, so that neutral line intensity at the light-converging point (F) may be locally increased.
従来技術、競合技術の概要(英語) BACKGROUND ART
Neutron radiation is, such as neutron diffraction, neutron rays irradiated to the material of the scattering, diffraction or the like can be determined by checking, in order to examine the structure of the material used. Unlike the charge does not have an electronic neutron, a high permeability material is scattered by atomic nuclei. For this reason, when using the neutron rays, as well as scattering, diffraction of the material by a variety of structures used to examine characteristics of the electron beam and X is different from the case of using the obtained information. In particular, low energy thermal neutron scattering of the neutron can be various types of information in a small-angle scattering is extremely effective for the analysis of light elements.
On the other hand, the configuration of the neutron source that emits neutrons, characteristics, and the electron source is largely different from the X-ray source and the like. X-ray source as electron source and, energy can be adjusted with a high intensity (level) of a single electron beam and emits X-ray can be used on the other hand, with such a property and it is difficult to obtain the neutron source, which is actually used as the neutron source major, for example radioactive isotopes, a large facility (reactor or a large accelerator) is. In the former case only a very low intensity neutron cannot be obtained, in the latter case provides a high intensity neutron rays can be obtained, for the nuclear fission and nuclear crushing reaction is performed in a large-scale equipment is needed. Such maintenance of the reactor because it is not easy, is used for analysis as described above is not suitable as the neutron source.
Such as high strength and small in size than the reactor neutron line is obtained as the neutron source, for example as described in Non-Patent Document 1 (Riken Accelerator-driven compact Neutron Source) that RANS. RANS is in, the proton beam of about 7MeV generated in the accelerator, the 9Be thin film is irradiated. In this way, the neutron and 9B (fast neutron) is generated, the energy of the neutrons on the order of MeV is high, for example of small-angle scattering of the neutron is not suitable for use in an experiment. For this reason, in the RANS, fast neutron moderator for the block is composed of a polyethylene thin film 9Be as viewed from the side than at the rear of the proton beam is fixed. Thus, the speed of the high-speed neutrons scattered energy thermal neutron is about 50MeV, emitted to the rear of the high strength. In addition, the light emitted on the neutron, a proton beam generated by the accelerator off is turned on, off controlled, pulsed neutron control can be obtained.
On the other hand, in this configuration, the proton beam emitted from the accelerator can be regarded as a point source is narrow, the invention has high directivity, high-speed neutrons are generated and then is decelerated when the polyethylene expands to block scattered, is finally generated in the thermal neutron is polyethylene in a variety of directions from a wide range of sounds to be diverging. In other words, the neutron source, emits neutrons from a wide range of the polyethylene a surface light source.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • 発明者(英語)
  • KOIZUMI, Satoshi
  • NOUDA, Yohei