scholarly journals A position-sensitive twin ionization chamber for fission fragment and prompt neutron correlation experiments

2016 ◽  
Vol 830 ◽  
pp. 366-374 ◽  
Author(s):  
A. Göök ◽  
W. Geerts ◽  
F.-J. Hambsch ◽  
S. Oberstedt ◽  
M. Vidali ◽  
...  
Keyword(s):  
Fission Fragment ◽  
Ionization Chamber ◽  
Prompt Neutron ◽  
Position Sensitive

scholarly journals Prompt Fission Neutron Investigation in 235U(nth,f) and 252Cf(sf) Reactions

2019 ◽  
Vol 211 ◽  
pp. 04003 ◽  
Author(s):  
Shakir Zeynalov ◽  
Pavel Sedyshev ◽  
Valery Shvetsov ◽  
Olga Sidorova
Keyword(s):  
Kinetic Energy ◽  
Fission Fragment ◽  
Ionization Chamber ◽  
Neutron Emission ◽  
Digital Signal ◽  
Fission Neutron ◽  
Sampling Frequency ◽  
Prompt Neutron ◽  
Prompt Fission ◽  
Prompt Fission Neutron

The prompt neutron emission in thermal neutron induced fission of 235U and spontaneous fission of 252Cf was investigated by using digital signal electronics. The goal was to check a new revised data analysis software with fission fragment (FF) kinetic energy corrections after prompt fission neutron (PFN) emission. The revised software was used to reanalyze old data measured in EC-JRC-IRMM, where 252Cf(sf) reaction was investigated. Both measurements were done using similar twin Frisch grid ionization chamber for fission fragment detection with equivalent NE213 fast neutron detector. About 0.5*106 FF with PFN coincidences have been analyzed in both measurements. The fission fragment kinetic energy, mass and angular distribution were investigated along with prompt neutron time of flight and pulse shape analysis using a six channel synchronous waveform digitizer (WFD) with sampling frequency of 250 MHz and 12 bit resolution in the 235U(nth,f) reaction. Similar WFD with sampling frequency of 100 MHz was used for PFN investigation in 252Cf(sf) reaction. These two experiments were considered as a reference for further investigations with a new setup composed of position sensitive ionization chamber to detect FF and an array of 32 liquid scintillators recently constructed in Dubna to detect neutrons.

scholarly journals Prompt fission neutron emission in the reaction 235U(n,f)

2018 ◽  
Vol 169 ◽  
pp. 00004 ◽  
Author(s):  
Alf Göök ◽  
Franz-Josef Hambsch ◽  
Stephan Oberstedt
Keyword(s):  
Fission Fragment ◽  
Ionization Chamber ◽  
Neutron Emission ◽  
Nuclear Data ◽  
Fission Neutron ◽  
Fission Fragments ◽  
Position Sensitive ◽  
Prompt Fission ◽  
Prompt Fission Neutron ◽  
Reaction 235U

Experimental activities at JRC-Geel on prompt fission neutron (PFN) emission in response to OECD/NEA nuclear data requests are presented in this contribution. Specifically, on-going investigations of PFN emission from the reaction 235U(n,f) in the region of the resolved resonances, taking place at the GELINA facility, are presented. The focus of this contribution lies on studies of PFN correlations with fission fragment properties. The experiment employs a scintillation detector array for neutron detection, while fission fragment properties are determined via the double kinetic energy technique using a position sensitive twin ionization chamber. This setup allows us to study several correlations between properties of neutron and fission fragments simultaneously. Results on PFN correlations with fission fragment properties from the present study differ significantly from earlier studies on this reaction, induced by thermal neutrons.

scholarly journals Neutron Multiplicity Correlations with Fission Fragment Mass and Energy from 239Pu(n,f)

2020 ◽  
Vol 239 ◽  
pp. 05009
Author(s):  
Alf Göök ◽  
Franz-Josef Hambsch ◽  
Stephan Oberstedt
Keyword(s):  
Fission Fragment ◽  
Ionization Chamber ◽  
Nuclear Reactor ◽  
Neutron Multiplicity ◽  
Scintillation Detectors ◽  
Mass Yield ◽  
Fragment Mass ◽  
Position Sensitive ◽  
Neutron Multiplicities ◽  
Average Neutron

There exists experimental evidence for strong fluctuations of the average neutron multiplicity from resonance to resonance in 239Pu(n,f). These fluctuations have been shown to impact nuclear reactor benchmarks by reducing the criticality. The fluctuating neutron multiplicity can be explained as a consequence of the competition between direct fission and the (n,γf) process. However, there is also evidence for fluctuations of the fission fragment mass yields from resonance to resonance. The mass yield fluctuations may also contribute to fluctuations of the neutron multiplicity averaged over all fission fragment masses. In order to model the contribution to the neutron multiplicity fluctuations by the fission fragment mass yield fluctuations new data on the correlations between fission fragment properties and neutron multiplicities are in need. We present experiments carried out to determine prompt neutron multiplicity correlations with fission fragment masses and total kinetic energies in the reaction 239Pu(n,f). The experiment has been performed at the GELINA facility at JRC-Geel. A twin position-sensitive Frisch-grid ionization chamber is used for fission fragment identification via the double kinetic energy technique. An array of scintillation detectors is employed for neutron counting. Correlations between average neutron multiplicities and fission fragment properties have been measured with improved resolution in both mass and TKE, compared to data from the literature.

Impact of prompt-neutron corrections on final fission-fragment distributions

2012 ◽  
Vol 86 (5) ◽  
Author(s):  
A. Al-Adili ◽  
F.-J. Hambsch ◽  
S. Pomp ◽  
S. Oberstedt
Keyword(s):  
Fission Fragment ◽  
Prompt Neutron

Fast ionization chamber for fission fragment detection with a large amount of U-235

1982 ◽  
Vol 200 (2-3) ◽  
pp. 407-410 ◽  
Author(s):  
A.A. Bogdzel ◽  
A. Duka-Zólyomi ◽  
J. Kliman ◽  
V. Presperin ◽  
S.P. Avdeev ◽  
...  
Keyword(s):  
Fission Fragment ◽  
Ionization Chamber

Sensitivity of Prompt Neutron Multiplicity to Fission Fragment Characteristics

2015 ◽  
Vol 181 (3) ◽  
pp. 289-301 ◽  
Author(s):  
A. Tudora ◽  
F.-J. Hambsch ◽  
S. Oberstedt ◽  
G. Giubega ◽  
I. Visan
Keyword(s):  
Fission Fragment ◽  
Neutron Multiplicity ◽  
Prompt Neutron

scholarly journals Implementing and testing theoretical fission fragment yields in a Hauser-Feshbach statistical decay framework

2018 ◽  
Vol 169 ◽  
pp. 00006 ◽  
Author(s):  
Patrick Jaffke ◽  
Peter Möller ◽  
Ionel Stetcu ◽  
Patrick Talou ◽  
Christelle Schmitt
Keyword(s):  
Kinetic Energy ◽  
Potential Energy ◽  
Potential Energy Surface ◽  
Fission Fragment ◽  
Energy Surface ◽  
Prompt Neutron ◽  
Fission Fragments ◽  
Statistical Decay ◽  
Γ Ray ◽  
The Impact

We implement fission fragment yields, calculated using Brownian shape-motion on a macroscopic-microscopic potential energy surface in six dimensions, into the Hauser-Feshbach statistical decay code CGMF. This combination allows us to test the impact of utilizing theoretically-calculated fission fragment yields on the subsequent prompt neutron and γ-ray emission. We draw connections between the fragment yields and the total kinetic energy TKE of the fission fragments and demonstrate that the use of calculated yields can introduce a difference in the 〈TKE〉 and, thus, the prompt neutron multiplicity v, as compared with experimental fragment yields. We deduce the uncertainty on the 〈TKE〉 and v from this procedure and identify possible applications.

scholarly journals Performance validation of the first arm of FALSTAFF: 252Cf and 235U fission fragment characterisation

2019 ◽  
Vol 211 ◽  
pp. 04002 ◽  
Author(s):  
D. Doré ◽  
E. Berthoumieux ◽  
Q. Deshayes ◽  
L. Thulliez ◽  
P. Legou ◽  
...  
Keyword(s):  
Fission Fragment ◽  
Ionization Chamber ◽  
Nuclear Data ◽  
Nuclear Fission ◽  
Fragment Mass ◽  
Proportional Chamber ◽  
Before And After ◽  
Energy Domain ◽  
Gen Iv ◽  
Performance Validation

The renewed interest for the study of nuclear fission is mainly motivated by the development of GEN-IV reactor concepts, mostly foreseen to operate in the fast neutron energy domain. To support this development, new high-quality nuclear data are needed. In this context, a new experimental setup, the FALSTAFF spectrometer, dedicated to the study of nuclear fission is under development. Employing the double-velocity (2V) and energy-velocity (EV) methods, the fission fragment mass before and after neutron evaporation will be deduced and the correlation between prompt neutron multiplicity and fragment mass will be determined. The first arm of the spectrometer is achieved. It is composed of two SED-MWPC detectors (a combination of a foil to produce secondary electrons and a Multi-Wire Proportional Chamber to detect them) and an axial ionization chamber. The SED-MWPC give access to the velocity (V) via time-of-flight and position measurements. The ionization chamber measures the fragment kinetic energy (E) and the energy loss profile. Preliminary results for spontaneous fission of 252Cf and from the thermal-neutron induced fission experiment on 235U, performed at the Orphée reactor (CEA-Saclay, France), are presented.

scholarly journals Prompt and Delayed Neutron Emissions and Fission Product Yield Calculations with Hauser-Feshbach Statistical Decay Theory and Summation Calculation Method

2019 ◽  
Vol 211 ◽  
pp. 04005 ◽  
Author(s):  
Shin Okumura ◽  
Toshihiko Kawano ◽  
Satoshi Chiba
Keyword(s):  
Fission Product ◽  
Fission Fragment ◽  
Neutron Emission ◽  
Product Yield ◽  
Prompt Neutron ◽  
Delayed Neutron ◽  
Statistical Decay ◽  
Fission Product Yield ◽  
Neutron Multiplicities ◽  
D Model

We demonstrate the neutron emission and fission product yield calculations using the Hauser–Feshbach Fission Fragment Decay (HF3D) model and β decay. The HF3D model calculates the statistical decay of more than 500 primary fission fragment pairs formed by the neutron induced fission of 235U. In order to calculate the prompt neutron and photon emissions, the primary fission fragment distributions, i.e. mass, charge, excitation energy, spin and parity are deterministically generated and numerically integrated for all fission fragments. The calculated prompt neutron multiplicities, independent fission product yield are fully consistent each other. We combine the β-decay and the summation calculations with the HF3D model calculation to obtain the cumulative fission product yield, decay heat and delayed neutron yield. The calculated fission observables are compared with available experimental data.

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