DOI: 10.55176/2414-1038-2021-3-5-10

Authors & Affiliations

Egorov A.S., Gremyachkin D.E., Piksaikin V.M., Mitrofanov K.V., Mitrofanov V.F., Kobets U.A., Kolesnikov D.V., Chaplygin E.I., Matveev O V., Sutyagin I.A.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia

Egorov A.S. – Senior Researcher.
Gremyachkin D.E. – Researcher. Contacts: 1, pl. Bondarenko, Obninsk, Kaluga region, Russia, 249033. Tel.: +7 (484) 399-83-49; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Piksaikin V.M. – Leading Researcher, Cand. Sci. (Phys.-Math.).
Mitrofanov K.V. – Senior Researcher.
Mitrofanov V.F. – Senior researcher.
Kobets U.A. – Chief Engineer of the accelerator complex.
Kolesnikov D.V. – Technician of the 1st category of the accelerator complex.
Chaplygin E.I. – Technician of the 1st category of the accelerator complex.
Matveev O.V. – Leading Engineer of the accelerator complex.
Sutyagin I.A. – Research Engineer of the accelerator complex.

Abstract

Development of the technologies of nuclear energy utilization, particularly involving of the minor actinides nuclides in the fuel cycle, due to the differences of time characteristics of the fissioning systems and the number of neutrons emitted by nuclides in the fission process, including its growth with the growth of primary neutron energy require the increase of accuracy and the volume of nuclear data. In the present work the behavior of the time dependence of delayed neutron intensity is studied for the neutron induced fission of the 237Np with the growth of the excitation energy. In the process of the comparative analysis there have been used the data calculated using GEF code and experimental data. Comparative analysis of the mass distributions of fission fragments for the fission of 237Np by neutrons with energies 1 and 18 MeV shows the difference in the magnitude of the separate masses from 15 times in the region of the asymmetric fission to 100 times in the region of the symmetric fission, that is the evidence of the differences in the time behavior of the decay curves of delayed neutron intensity. Using the set-up, that allows registering the delayed neutrons, installed of the neutron-physical research channel of Tandem-3M accelerator there have been made the measurement of the decay curves of delayed neutron intensity using the primary neutrons with different energy.

Keywords
nuclear fission, delayed neutrons, delayed neutron precursors, minor actinides, time dependence of delayed neutron intensity, fission fragments mass distribution, charged particle accelerators, neptunium 237Np, protons, deuterons

Article Text (PDF, in Russian)

References

UDC 539.173.84

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2021, issue 3, 3:1