中國先進研究堆中子束應用關鍵技術及若干科學問題立項報告

陳東風

摘 要：該研究的研究內容涵蓋物理、化學、材料和工程等領域，擬解決以下3個方面的關鍵科學問題：（1）中子散射關鍵技術方法研究；（2）新型功能材料結構和性質關系的中子散射研究；（3）工程部件應力分布和中子成像的方法學研究。為此，項目設置6個子研究：（1）反應堆中子束優(yōu)化及特殊樣品環(huán)境研究；（2）單晶和多晶新材料的中子衍射研究；（3）強關聯(lián)體系中原子與自旋動態(tài)的中子散射研究；（4）磁性材料的中子散射研究；（5）中子應力三維無損深度測量技術研究；（6）中子在物質中的衰減與中子成像研究。

關鍵詞：中國先進研究堆 中子散射技術 先進功能材料 殘余應力 中子成像

Project Report of Neutron Beam Application on China Advanced Research Reactor

Chen Dongfeng

（China Institute of Atomic Energy）

Abstract：Nowadays to study the relation between structures and properties of materials is one of the main tasks in Physics， Chemistry， material science and others research fields， and it is a usual way to get the information using particles interaction with matters， among which X ray and neutron are two basic ones. It is well know that the interaction principle of neutrons and photons with atoms is quite different， so more information will be obtained using both complementary tools. The neutron has the following properties： no charge， low energy， inherence magnetic moment， deep penetration， sensitivity on light element （such as H， C， N， O， etc）， distinguishability on isotopes （such as 7Li、11B etc.） and near neighbor elements （such as Mn， Fe and so on）. So neutron scattering technique can not only study the crystal structure， but also obtain the magnetic structure information； not only investigate the static microstructure of materials， but also prove the reliabilities of theoretical models. CARR is expected to be critical in 2009， 60 MW and 8×1014N/（cm2·S-1） unperturbed thermal neutron flux make it standing on an international advanced level. Using the four circle， powder， residual stress neutron diffractometers and neutron imaging instrument at CARR， in this project studies focus on three aspects： （1）the methodology study of neutron scattering technique； （2）the neutron scattering study on the relation between the structures and properties of novel function materials； （3）studies of the residual stress distribution in engineering components and the methodology of neutron imaging. Six topics are set as following： （1）Optimization on reactor neutron beam and studies on special sample environment； （2）Atomic and spin dynamics in strongly correlated system studied by neutron scattering； （3）Neutron Diffraction Study on Novel Crystal Materials； （4）Neutron scattering study on magnetic materials； （5）Neutron Diffraction Study on Three-Dimensional Nondestructive Deep Measurement of The Residual Stress； （6）Study on neutron attenuation in matter and neutron imaging.

Key Words：China advanced research reactor； Neutron scattering； Novel function materials； Residue stress； Neutron imaging

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