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Measurement of Delayed-Neutron Yield from 237 Np Fission Induced by Thermal Neutrons

Measurement of Delayed-Neutron Yield from 237 Np Fission Induced by Thermal Neutrons. G. Parzych (UwB), A.N. Lihachev (JINR), V.R. Andrianov (JINR), P. Sibczynski (US), J. Ž emli č ka (CTU), Z. Mr á zová (CTU), O. Š imek (CTU), J. Sieracki (UZG).

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Measurement of Delayed-Neutron Yield from 237 Np Fission Induced by Thermal Neutrons

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  1. Measurement of Delayed-Neutron Yieldfrom 237Np Fission Induced by Thermal Neutrons G. Parzych (UwB), A.N. Lihachev (JINR), V.R. Andrianov (JINR), P. Sibczynski (US), J. Žemlička (CTU), Z. Mrázová (CTU), O.Šimek (CTU), J. Sieracki (UZG) Frank Laboratory of Neutron Physics - Dubna 24.06.2007-7.07.2007

  2. Measurement of Delayed-Neutron Yieldfrom 237Np Fission Induced by Thermal Neutrons Scheme of pulse reactor IBR-2 Frank Laboratory of Neutron Physics - Dubna 24.06.2007-7.07.2007

  3. Measurement of Delayed-Neutron Yieldfrom 237Np Fission Induced by Thermal Neutrons The mechanism of delayed neutron generation Frank Laboratory of Neutron Physics - Dubna 24.06.2007-7.07.2007

  4. Measurement of Delayed-Neutron Yieldfrom 237Np Fission Induced by Thermal Neutrons Motivations of the measurements of the yields ofthe delayed neutrons for transuranium elements • Well known the fundamental role of delayed neutrons in the safety operation and time-dependant behavior of nuclear reactors. • The delayed neutron data such as the absolute yield of DN, relative abundances of DN, half-lives of their precursors, and energy spectra of DN are important for kinetics and safety operations of nuclear reactors. • In spite of great efforts in investigation of delayed neutron physics the fundamental delayed neutron characteristics for most common fissionable reactor isotopes are little-studied. Frank Laboratory of Neutron Physics - Dubna 24.06.2007-7.07.2007

  5. Measurement of Delayed-Neutron Yieldfrom 237Np Fission Induced by Thermal Neutrons The experimental installation “Isomer-M” Fig. 1. The scheme of the “Isomer-M” installation: 1 – IBR-2 reactor core and the moderator of neutrons, 2, 3 – collimators, 4 –bent mirror guide , 5 – Cd-Ping-Pong, 6 – chopper, 7 – neutron detector assembly and combined shield, 8 – 3He-counters, 9 – Cd-shield, 10 – sample. Frank Laboratory of Neutron Physics - Dubna 24.06.2007-7.07.2007

  6. Measurement of Delayed-Neutron Yieldfrom 237Np Fission Induced by Thermal Neutrons The method of experiment and measurement The number of fission events, which happened in a sample for all time of measurement The number of prompt neutrons registered by the detector The number of delayed neutrons registered by the detector Frank Laboratory of Neutron Physics - Dubna 24.06.2007-7.07.2007

  7. Measurement of Delayed-Neutron Yieldfrom 237Np Fission Induced by Thermal Neutrons Calibration measurement of235U sample Fig. 2 . The time-of-flight spectrum of 235U measured at the “Isomer-M” installation: а – effect + background (235U), b – background (235U+Cd-shield). Frank Laboratory of Neutron Physics - Dubna 24.06.2007-7.07.2007

  8. Measurement of Delayed-Neutron Yieldfrom 237Np Fission Induced by Thermal Neutrons Calibration measurement of237Np sample Fig. 3 . The time-of-flight spectrum of 237Np measured at the “Isomer-M” installation: а – effect + background (237Np), b – background (237Np+Cd-shield). Frank Laboratory of Neutron Physics - Dubna 24.06.2007-7.07.2007

  9. Measurement of Delayed-Neutron Yieldfrom 237Np Fission Induced by Thermal Neutrons Frank Laboratory of Neutron Physics - Dubna 24.06.2007-7.07.2007

  10. Measurement of Delayed-Neutron Yieldfrom 237Np Fission Induced by Thermal Neutrons From calibration measurements with 237Np,mean value of is Known constant νp is And so, from The final result is νd = 0.0110 ±0.0009 Frank Laboratory of Neutron Physics - Dubna 24.06.2007-7.07.2007

  11. Measurement of Delayed-Neutron Yieldfrom 237Np Fission Induced by Thermal Neutrons Special thanks for our supervisors, whose patiently answered for all kinds of our questions. For Mr. Zawodny and Mr. Chmielowski for help to survive in this beautiful country. And, of course, for direction of all JINR sections for possibility to see one of the biggest laboratories in the world. Frank Laboratory of Neutron Physics - Dubna 24.06.2007-7.07.2007

  12. Thank You for attention  Grzegorz Parzych, Jaroslaw Sieracki, Pawel Sibczynski

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