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A method for reducing neutron energy error in the measurement of neutron nuclear reaction cross section

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

Active Publication Date: 2021-11-02
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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  • A method for reducing neutron energy error in the measurement of neutron nuclear reaction cross section
  • A method for reducing neutron energy error in the measurement of neutron nuclear reaction cross section
  • A method for reducing neutron energy error in the measurement of neutron nuclear reaction cross section

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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 the neutron energy error in the measurement of the neutron nuclear reaction section. Aiming at the problem that the results of neutron nuclear reaction cross-section measurement (such as the count and energy spectrum of reaction products) are contributed by the superposition of neutrons of various energies, the present invention utilizes the neutron energy spectrum obtained by actual measurement, and through an iterative method, multiple The measurement results of neutron nuclear reactions jointly contributed by neutrons of different energies are deconvoluted to a specific neutron energy, thereby effectively reducing the neutron energy error.

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 Patents(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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