Speaker
Description
Abstract. A new time-of-flight method for measuring the neutron lifetime $\tau_{\mathrm{n}}$ was proposed in [1] The time-of-flight method for measuring the neutron lifetime $\tau_{\mathrm{n}}$ is very sensitive to the background. It was found that the background should be less than $10^{-6}$. According to [2] , between the power pulses of the IBR-2 reactor, about $7 \%$ of the reactor power is allocated. Since the number of neutrons is proportional to the power of the reactor, the background from the delayed neutrons will also be $7 \%$ in 200 milliseconds. Measurements of the background of delayed neutrons were made and a complex dependence of the background on time was established. The influence of the background of the delayed neutron on the accuracy of measuring the neutron lifetime by the time-of-flight method is estimated.
References
1. V.L.Kuznetsov, E.V.Kuznetsova, P.V.Sedyshev. Measuring Neutron Lifetime on an $IBR-2$ Pulsed Neutron Source. Physics of Particles and Nuclei Letters, 2018 . Vol. $15,$ No. $6,$ pp. $678-684$
2. E.A.Bondarchenko, Yu.N.Pepelyshev, A.K.Popov. An experimental and model study of the dynamics of a pulsed batch reactor $IBR-2$. ECHAYA, $2004,$ v. $35,$ issue $4,$ pp. 927 983
