A New Method of Prompt Fission Neutron Energy Spectrum Unfolding

Journal Article · Thu Nov 25 00:00:00 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]

---

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, Vol. 1301, Issue 1; Conference: 2. international conference on application of mathematics in technical and natural sciences, Sozopol (Bulgaria), 21-26 Jun 2010; Other Information: DOI: 10.1063/1.3526610; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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