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Investigations in the Field of Nuclear Physics with Neutrons

Development of the IREN source:

• Commissioning of the second section of the LUE-200 accelerator with the modulator DAWONSYS and clystron TH2129 Thomson.
  
  
• Trial operation of the accelerator consisting of two accelerating sections with a beam at a frequency of 25 - 50 Hz .
  
  
• Providing the neutron beam time of 1000 hours from IREN for physical experiments.
  
  
• Modernization of experimental beamline 4 (flight path 60 m) of the IREN facility.
  
  Fundamental investigations of nuclear reactions with neutrons:
  
• Measurement of T-odd effects in the low-lying resonance of ²³⁵U.
  
  
• Measurement of angular correlations of the gamma-ray emission in inelastic scattering of neutrons by various elements in the framework of the TANGRA project.
  
  
• Investigation of reactions ²⁵Mg(n,) ²²Ne, ⁹¹Zr(n,) ⁸⁸Sr and ¹⁴⁴Nd(n,) ¹⁴¹Ce for neutron energies E_n = 5 - 6.5 MeV at the facilities EG-5 (FLNP JINR) and EG-4.5 (Institute of High Energy Physics of the Chinese Academy of Sciences). Measurements of the reactions (n,p) and (n,) for ³⁵Cl and ¹⁴N in the energy range of 0.1 - 1 and 4 - 6.5 MeV.
  
  
• Commissioning of the data acquisition system based on the PIXIE-4 module for the alpha spectrometer.
  
  
• Measurement of the P-odd correlation in the reaction ¹⁰B(n,) ⁷Li with an accuracy of 3x10 ^-8.
  
  
• Development and construction of a position-sensitive ionization chamber with 32-channel analog electronics; performing of test experiments at IBR-2. Development of a double ionization chamber with a Frisch grid for measurments of spectra and multiplicities of prompt fission neutrons in the reaction ²³⁵U(n,f) at IBR-2 and IREN.
  
  
• Measurement of proton yields and energy distributions in the ternary fission of ²⁵²Cf.
  
  
• Determination of parameters of the feromagnetic neutron resonator for neutron energies of 0.062 - 1.3 eV. Measurement of the nuclear precession for protons.
  
  
• Completion of the analysis of experimental data from the experiment performed in Dalat (Vietnam) aimed at studying two-step cascades in thermal neutron capture by an Yb-171 target. Determination of the Cooper pair breaking threshold using the developed practical model of cascade gamma-decay.
  
  
• Determination of the main characteristics of the massive natural uranium target "Quinta" irradiated by deuterons with energies of 1-8 GeV.
  Investigation of the fundamental properties of the neutron, UCN physics:
  
• Detailed test of the dynamical theory of neutron diffraction on a moving grating as a methodical basis of the experiment for testing the equivalence principle for the neutron.
  
  
• Experimental determination of characteristics of resonance transitions between quantum states of neutrons in the gravitational field of the Earth using the GRANIT spectrometer.
  
  
• Establishing of a constraint on the product of coupling constants of scalar and pseudoscalar axion-like interaction at the level of 10 ^-16 for distances ~ 10 µm on the GRANIT spectrometer.
  
  
• Experimental investigation of the properties of different hydrogen- free oil coatings to determine the optimum trap coating material in the neutron lifetime measurement setup being developed.
  
  Applied research:
  
• Analysis of the boron content in new composite materials by neutron spectroscopy at the IREN facility.
  
  
• Comparative analysis of the sensitivity of different non-destructive methods of elemental analysis.
  
  
• Investigation of surface layers using Elastic Recoil Detection method and Rutherford Backscattering Spectrometry.
  
  
• Mathematical and physical modeling and calibration of neutron and gamma detectors for spacecrafts.
  
  
• Development of a new control system for the pneumatic REGATA facility. Improvement of hardware and software for automation of the neutron activation analysis for the REGATA facility at the IBR-2 reactor. Creating a database of nuclear constants for calculation of absolute concentrations of elements using the absolute method in addition to the present relative method of calculation of concentrations.
  
  
• Participation in the UN Program on air quality in Europe - simultaneous collection of moss-biomonitors and performing neutron activation analysis on a series of samples from the regions of Russia, Europe and Asia. Application of NAA in bionanotechnology, ecology, medicine and the development of novel materials within Russian and international projects.
  
  

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