Rapid nuclear cross section Doppler broadening method

Abstract

The invention discloses a rapid nuclear cross section Doppler broadening method. Firstly the pole array of nuclides under the 0K temperature is calculated, and the cross section of the nuclides under the temperature T is derived in the form of pole expression under energy, temperature, atomic weight and 0K temperature; and then pole corresponding energy points of a distinguishable resonance area are equally divided through the number of parallel computing units, threads are allocated to each equally divided area according to the energy level span of energy E, and each thread independently performs Doppler broadening computation so as to generate the nuclear cross selection under the temperature T. Ordering is performed according to different energy corresponding to the pole array so that the cross section value of the whole energy interval after broadening under the temperature T is obtained; and finally a broadened energy framework under the temperature T is reestablished according to the energy corresponding to the pole array and the cross section value and a specified tolerance error value and the corresponding nuclear cross section is obtained. The simplified pole nuclear cross section expression form and multi-area and multi-thread parallel computing are put forward so that the effect of rapid and accurate computation of multiple temperature cross sections can be achieved.

Description

technical field [0001] The invention relates to a method for generating nuclear cross sections, which belongs to the nuclear database processing direction in the fields of nuclear physics, nuclear system design, etc., and specifically relates to a method for dynamically adjusting continuous energy neutron cross sections according to temperature changes in Monte Carlo neutron transport calculations. Background technique [0002] Nuclear cross-section data is the basis of neutron transport calculations, and has an extremely important impact on the accuracy of calculation results. On the other hand, the measurement of the neutron cross-section mainly depends on the relative motion between the incident particle and the target nucleus, and the incident velocity of the incident neutron in the laboratory system needs to be known in the actual calculation process. At absolute zero, the target nucleus is at rest, and the neutron velocity is equal to its velocity relative to the targe...

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Problems solved by technology

However, for heavy nuclei, especially the resonance region, due to the drastic changes in the cross-section of this section, repeated sampling is required many times, which greatly reduces the efficiency of the method.

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