Abstract
In the framework of TANGRA-project at the Frank Laboratory of Neutron Physics of the Joint Institute for Nuclear research in Dubna (Russia), two experimental setups (Fig. 1) have been designed and tested for investigation of 14-MeV neutron-induced nuclear reactions on a number of important for nuclear science and engineering isotopes. As a source of 14-MeV “tagged” neutrons we are using the VNIIA ING-27 steady-state portable neutron generator with embedded in its vacuum tube 64-pixel charge-particle detector. The “Romashka” system is an array of up-to 24 hexagonal NaI(Tl)-crystal scintillation probes, while the “Romasha” array consists of 18 cylindrical BGO-crystal detectors of neutrons and gamma-rays. In addition to these detectors there is a HPGe gamma-ray spectrometer and a number of Stilbene detectors that can be added for high-resolution gamma-ray spectrometry and neutron-gamma detection. The main characteristics of the neutron-induced nuclear reaction products can be investigated by commissioning the detectors in suitable for these experiments’ geometries. Both setups can be used for doing basic and applied scientific research, because they permit simultaneously to measure the energy, angle and multiplicity distributions of gamma-rays and neutrons, produced in the competitive neutron-induced nuclear reactions (n, n’γ), (n,2n), (n, xnγ) and (n, f) in pure or complex substances.
Highlights
Our society and the modern technologies and in future will need much more energy that in the past
To measure the energy and angular distributions of gamma-rays form neutron induced nuclear reactions we are using NaI(Tl) and BGO detectors in configurations shown in Figure 2
To highlight the problems one can have when is doing this type of measurements with special nuclear materials (SNM) and to show the importance of using tagged neutrons and the TCAPM, we show only the energy spectra, obtained with TANGRA-HPGe setup (Fig. 2, right) and a rod-sample from natural uranium (natU) in the γ-ray energy interval from 60 keV up to 2 MeV
Summary
Our society and the modern technologies and in future will need much more energy that in the past. The libraries with experimental and evaluated nuclear data, on 238U, need to be enhanced with more precise and confident information about the characteristics (i.e. total and partial, di↵erential, cross-sections) of di↵erent type of fast neutron induced reactions (elastic and nonelastic neutron scattering, fission, etc.), and of the products (mass-energy, multiplicity and angular distributions) from them [1, 2]. The gammarays producing in the (n, xnγ) and (n, fission) are of a particular ifnterest from fundamental, practical and methodological points of view They are helping to investigate the nuclear structure of the atomic nuclei as well as the neutron induced processes themselves, performing theoretical calculations, model simulations and/or experiments. As a source of tagged neutrons, we are using the portable neutron generator ING-27 of VNIIA (Moscow) [4]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
