LXXI International conference "NUCLEUS – 2021. Nuclear physics and elementary particle physics. Nuclear physics technologies"

Restoration of the spectrum of delayed neutrons of the pulse reactor IBR-2.

Not scheduled

25m

Poster report Section 3. Modern nuclear physics methods and technologies. Do not paticipate

Speaker

Dr Евгения Кузнецова (JINR, INR RAS)

Description

Abstract. The new time-of-flight method for measuring the neutron lifetime τn, proposed in [1], is sensitive to the background. The effect-to-background ratio was found to be of the order of 10-6 for the time-of-flight base of 20 meters. The pulsed neutron source IBR-2 has an irremovable background from the delayed neutrons. Between the power pulses of the IBR-2 reactor, about 7% of the reactor power is allocated, according to [2]. Since the number of neutrons is proportional to the reactor power, the background from the delayed neutrons will also be 7% in 200 milliseconds. In the time range of interest to us, the background from the delayed neutrons will be on the order of 2%. Measurements of the background of the delayed neutrons were carried out on the 1st channel of the IBR-2 and a complex dependence of the background on time was established.

The authors are grateful to V.N. Shvetsov, E.V. Lychagin, E.A. Koptelov for supporting the work, as well as Sh. Zeynalov, S.I. Negovelov, K. Khramko and A. Ergashov for their help in the work.

REFERENCES

1. V.L. Kuznetsov, E.V. Kuznetsova, P.V. Sedyshev, Physics of Particles and Nuclei Letters, V 15, issue 6, pp. 678 – 684 (2018).
2. E.A. Bondarchenko, Yu.N. Pepelyshev, A.K. Popov. ECHAYA, V 35, issue 4, pp. 927-983 (2004).