Method for reducing neutron energy errors in neutron nuclear reaction section measurement

A neutron energy and neutron technology, which is applied in the field of nuclear reaction cross section measurement, can solve the problems of increasing the bin width of neutron energy and increasing the lateral error of neutron energy, so as to achieve a simple and intuitive calculation model and reduce the error of neutron energy. , easy to achieve effect

Active Publication Date: 2020-08-04
PEKING UNIV
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Problems solved by technology

Therefore, in actual data processing, the bin width of neutron energy is often artificially increased to ensure better statistics of nuclear reaction product counts, but the lateral error of neutron energy also increases accordingly

Method used

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  • Method for reducing neutron energy errors in neutron nuclear reaction section measurement
  • Method for reducing neutron energy errors in neutron nuclear reaction section measurement
  • Method for reducing neutron energy errors in neutron nuclear reaction section measurement

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Embodiment Construction

[0036] The method of the present invention is described below through specific examples, but the present invention is not limited thereto.

[0037] Such as figure 1 As shown, in the present embodiment, the charged particles generated by the nuclear reaction are measured with a double-screen grid ionization chamber 6 having a symmetrical structure on both sides, and the deuterium ion beam is accelerated by a 4.5MV electrostatic accelerator to bombard the deuterium gas target 5 so as to generate 2 H(d,n) 3 He reacts to generate neutrons, the neutron energy spectrum is measured with EJ-309 liquid scintillation detector 7, and 238 u 3 o 8 produced by the sample 238 The U(n,f) reaction measures the absolute and relative neutron fluxes, and thus the 58 Ni(n,α) 55 The cross section of the Fe reaction was measured. In the measurement, the pressure of the deuterium gas target 5 is about 0.3MPa, separated from the vacuum pipeline by a 5 μm thick molybdenum film, and the energy of t...

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Abstract

The invention discloses a method for reducing neutron energy errors in neutron nuclear reaction section measurement. For the problem that results (such as counting and energy spectrum of reaction products) of neutron nuclear reaction section measurement are contributed by superposition of neutrons with various energies, the method utilizes the neutron energy spectrum obtained through actual measurement to make the measurement result of the neutron nuclear reaction jointly contributed by neutrons with various energies deconvolved to a certain specific neutron energy through an iterative method,so that the neutron energy error is effectively reduced.

Description

technical field [0001] The invention relates to nuclear reaction section measurement technology, in particular to a method for reducing neutron energy error in neutron nuclear reaction section measurement. Background technique [0002] When measuring the neutron-induced nuclear reaction cross section, neutron sources need to be used to generate neutrons. The most commonly used neutron sources in the field of nuclear reaction cross section measurement are accelerator neutron sources and spallation neutron sources. [0003] For accelerator neutron sources, accelerator neutron sources accelerate charged particles to a certain energy to react with target nuclei to generate neutrons. The common neutron generation reactions are D(d,n) 3 He, T(d,n) 4 He et al. In the absence of other interference reactions such as D(d,np)D, T(d,np)T opening the way, when the incident particle energy is fixed, the neutron energy at a certain angle of the neutron source is also stable. However, s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T3/00G01T3/06
CPCG01T3/00G01T3/005G01T3/065
Inventor 江浩雨白怀勇张国辉崔增琪胡益伟刘杰
Owner PEKING UNIV
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