2019, Issue 3

DOI: 10.55176/2414-1038-2019-3-170-179

Authors & Affiliations

Andreev S.A., Gabbasov D.M., Kostenko I.I., Litvin V.I., Lukin A.V., Moseeva A.R., Namakonov V.V., Sokolov Yu.A., Khmelnitskii D.V., Yudov A.A.
Russian Federal Nuclear Center — Zababakhin All-Russia Research Institute of Technical Physics, Snezhinsk, Russia

Andreev S.A. – Head of Department, Cand. Sci. (Phys.-Math.), Russian Federal Nuclear Center — Zababakhin All-Russia Research Institute of Technical Physics.
Gabbasov D.M. – Engineer, Russian Federal Nuclear Center – Zababakhin All-Russia Research Institute of Technical Physics.
Kostenko I.I. – Group Leader, Russian Federal Nuclear Center – Zababakhin All-Russia Research Institute of Technical Physics.
Litvin V.I. – Leading Researcher, Cand. Sci. (Techn.), Russian Federal Nuclear Center – Zababakhin All-Russia Research Institute of Technical Physics.
Lukin A.V. – Chief Researcher, Dr. Sci. (Phys.-Math.), Russian Federal Nuclear Center – Zababakhin All-Russia Research Institute of Technical Physics.
Moseeva A.R. – Engineer, Russian Federal Nuclear Center – Zababakhin All-Russia Research Institute of Technical Physics.
Namakonov V.V. – Engineer, Russian Federal Nuclear Center – Zababakhin All-Russia Research Institute of Technical Physics.
Sokolov Yu.A. – Leading Researcher, Cand. Sci. (Phys.-Math.), Russian Federal Nuclear Center – Zababakhin All-Russia Research Institute of Technical Physics.
Khmelnitskii D.V. – Deputy Head of Department, Cand. Sci. (Phys.-Math.), Russian Federal Nuclear Center – Zababakhin All-Russia Research Institute of Technical Physics.
Yudov A.A. – Head of the Laboratory, Russian Federal Nuclear Center – Zababakhin All-Russia Research Institute of Technical Physics. Contacts: post box 245, 13, Vasilyev st., Snezhinsk, Chelyabinsk region, Russia, 456770. Tel.: +7(351)465-11-49; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

Abstract

The paper presents the results of experiments in 14-MeV neutron transmission through lithium hydride layers 25 cm thick. Measurements were performed by neutron-activation analysis using NG-12I neutron generator. The neutron generator operated in static mode. In order to determine 14-MeV neutron transmission through sample layers and to evaluate neutron spectrum changes we have used neutron-activation detectors based on the following activation reactions: ¹⁹F(n,2n)¹⁸F, ²⁷Al(n,α)²⁴Na, ⁶⁴Zn(n,p)⁶⁴Cu, ¹¹⁵In(n,n')^115mIn, ⁶⁵Cu(n,2n)⁶⁴Cu, ⁶³Cu(n,γ)⁶⁴Cu. The activity of irradiated neutron-activation detectors was measured by the gamma-spectrometer with a semiconductor HPGe-detector. Neutron yield from the generator target was determined by monitor readings with fluoroplastic neutron-activation detector. The average 14-MeV neutron flow from the target came up to ~10¹⁰ n/s.
The experimental geometry and measurement results are described. Based on measurement data we determined the number of reactions for each neutron-activation detector, as well as coefficients of 14-MeV neutron transmission through lithium hydride layers of different thickness. The obtained results can be used to validate neutron-physical calculations and to update neutron constant libraries.

Keywords
lithium hydride, 14-MeV neutron generator, neutron activation detectors, HPGe-detector, neutron transmission coefficients

Article Text (PDF, in Russian)

References

UDC 539.172

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2019, issue 3, 3:16