A New Method of Prompt Fission Neutron Energy Spectrum Unfolding

Journal Article · Thu Nov 25 04:00:00 EST 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3526610· OSTI ID:21506814

Zeynalova, O V ^[1]; Zeynalov, Sh ^[2]; Hambsch, F -J; Oberstedt, S ^[3]

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1. Moscow State Institute of Radioengineering, Electronics and Automation, Moscow (Russian Federation)
2. Joint Institute for Nuclear Research, Dubna (Russian Federation)
3. EC-JRC-Institute for Reference Materials and Measurements, Geel (Belgium)

The prompt neutron emission in spontaneous fission of {sup 252}Cf has been investigated applying digital signal electronics along with associated digital signal processing algorithms. The goal was to find out the reasons of a long time existing discrepancy between theoretical calculations and the measurements of prompt fission neutron (PFN) emission dependence on the total kinetic energy (TKE) of fission fragments (FF). On the one hand the {sup 252}Cf(sf) reaction is one of the main references for nuclear data, on the other hand the understanding of PFN emission mechanism is very important for nuclear fission theory. Using a twin Frisch-grid ionization chamber for fission fragment (FF) detection and a NE213-equivalent neutron detector in total about 10{sup 7} fission fragment-neutron coincidences have been registered. Fission fragment kinetic energy, mass and angular distribution, neutron time-of-flight and pulse shape have been investigated using a 12 bit waveform digitizer. The signal waveforms have been analyzed using digital signal processing algorithms. For the first time the dependence of the number of emitted neutrons as a function of total kinetic energy (TKE) of the fragments is in very good agreement with theoretical calculations in the range of TKE from 140-220 MeV.

• OSTI ID: 21506814
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1301; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE NUCLEI
ALGORITHMS
ALPHA DECAY RADIOISOTOPES
ANGULAR DISTRIBUTION
BARYONS
CALIFORNIUM 252
CALIFORNIUM ISOTOPES
DECAY
DETECTION
DISTRIBUTION
ELECTRONIC CIRCUITS
ELEMENTARY PARTICLES
EMISSION
ENERGY
ENERGY RANGE
ENERGY SPECTRA
EVEN-EVEN NUCLEI
FERMIONS
FISSION
FISSION FRAGMENTS
FISSION NEUTRONS
HADRONS
HEAVY NUCLEI
IONIZATION CHAMBERS
ISOTOPES
KINETIC ENERGY
MASS
MATHEMATICAL LOGIC
MEASURING INSTRUMENTS
MEV RANGE
MEV RANGE 100-1000
NEUTRON DETECTORS
NEUTRON EMISSION
NEUTRONS
NUCLEAR DECAY
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PROMPT NEUTRONS
PULSE CIRCUITS
PULSE SHAPERS
RADIATION DETECTORS
RADIOISOTOPES
SIGNAL CONDITIONERS
SPECTRA
SPONTANEOUS FISSION
SPONTANEOUS FISSION RADIOISOTOPES
TIME-OF-FLIGHT METHOD
WAVE FORMS
YEARS LIVING RADIOISOTOPES