关键词: 核运动, Doppler效应, 中子输运, 反应率

Abstract: In speedy flowing medium at high temperatures the neutron transport behaviour will be affected by the macroscopic motion of the medium and the thermal agitation of the nuclei within the medium. The influence of the-macroscopic motion of the medium on the neutron transport can be described directly by the neutron transport equation (see details in Part 2.). The microscopic characteristic at high temperature can be described by studying the thermal agitation of nuclei, and its effect will be refleeted in the neutron nuclear cross section data, In this paper, the effect of the thermal motio of nuclei on neutron nuclear cross section data is studied. The Doppler broaden-problem of the Breit-Wigner single and multi-level and indinstinguishable resonance cross sections at high temperature are discussed in details.

Key words: Nucleonic Motion, Doppler Effect, Neutron Transport, Reaction rate