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Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleon—that is, mass numbers and binding energies per nucleon that are closer to the “peak” of the binding energy graph near 56. Sometimes neutrons are also produced. This decomposition of a large nucleus into smaller pieces is called fission. The breaking is rather random with the formation of a large...
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The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
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The difference between the calculated and experimentally measured masses is known as the mass defect of the atom. In the case of helium-4, the mass defect indicates a “loss” in mass of 4.0331 amu – 4.0026 amu = 0.0305 amu. The loss in mass accompanying the formation of an atom from protons, neutrons, and electrons is due to the conversion of that mass into energy that is evolved as the atom forms. The nuclear binding energy is the energy produced when the atoms’ nucleons are bound...
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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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On-demand neutron field customization via multiple neutron source assemblies.

T H Zhang1, M Zhang1, X Cao1

  • 1Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, China.

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PubMed
Summary
This summary is machine-generated.

This study introduces a novel multi-port neutron source system using D-D generators for customizable neutron energy spectra and flux control. This innovative platform enhances precision neutron science applications like activation analysis and imaging.

Keywords:
Flux distributionGeant4Hybrid neutron source assemblyMulti-source irradiation system

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Area of Science:

  • Nuclear Physics and Engineering
  • Materials Science and Engineering
  • Neutron Science and Technology

Background:

  • Conventional neutron irradiation facilities struggle with dynamic control over neutron energy spectra and spatial flux.
  • Existing systems often have fixed neutron spectra, limiting experimental flexibility and applications.

Purpose of the Study:

  • To propose and evaluate a multi-port neutron source system utilizing compact D-D neutron generators.
  • To demonstrate the capability for highly customizable neutron energy spectra and precise flux distribution control.
  • To overcome the limitations of fixed-spectrum neutron sources for advanced research.

Main Methods:

  • Utilizing compact high-intensity Deuterium-Deuterium (D-D) neutron generators in a multi-port configuration.
  • Employing coordinated regulation of epithermal and fast neutron ports for spectral and spatial control.
  • Designing independent Neutron Moderator Assemblies (NMAs) and adjusting neutron yield at each port.
  • Conducting Geant4 simulations to analyze spectral distributions and flux uniformity.

Main Results:

  • Achieved continuous spectral distributions from epithermal to fast neutron ranges by independent NMA design and yield adjustment.
  • Demonstrated significant improvement in irradiation uniformity for large-volume samples with six-port configurations.
  • Observed synergistic effects in symmetric multi-port arrangements, increasing fast neutron components and creating spectral gradients.

Conclusions:

  • The proposed D-D neutron source system offers unprecedented control over neutron energy spectra and spatial flux.
  • The system overcomes the fixed-spectrum limitations of conventional neutron sources, enabling new research possibilities.
  • This innovative platform holds significant potential for applications in neutron activation analysis, dynamic neutron imaging, and homogeneous material irradiation.