21 results on '"Hambsch, Franz-Josef"'
Search Results
2. Neutron induced fission of 237Np -- status, challenges and opportunities.
- Author
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Ruskov, Ivan, Goverdovski, Andrei, Furman, Walter, Kopatcha, Yury, Shcherbakov, Oleg, Hambsch, Franz-Josef, Oberstedta, Stephan, and Oberstedt, Andreas
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NUCLEAR fission ,NEUTRON scattering ,NUCLEAR science ,NUCLEAR reactors ,ACTINIDE elements - Abstract
Nowadays, there is an increased interest in a complete study of the neutroninduced fission of 237Np. This is due to the need of accurate and reliable nuclear data for nuclear science and technology. 237Np is generated (and accumulated) in the nuclear reactor core during reactor operation. As one of the most abundant long-lived isotopes in spent fuel ("waste"), the incineration of 237Np becomes an important issue. One scenario for burning of 237Np and other radio-toxic minor actinides suggests they are to be mixed into the fuel of future fast-neutron reactors, employing the so-called transmutation and partitioning technology. For testing present fission models, which are at the basis of new generation nuclear reactor developments, highly accurate and detailed neutron-induced nuclear reaction data is needed. However, the EXFOR nuclear database for 237Np on neutron-induced capture cross-section,ργ, and fission cross-section, ρf, as well as on the characteristics of capture and fission resonance parameters (Γ;γ, ρf, ρoΓf, fragments mass-energy yield distributions, multiplicities of neutronsνn and γ-rays νγ), has not been updated for decades. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
3. Scission-point model predictions of fission-fragment mass and total kinetic energy distributions for 236U and 252Cf.
- Author
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Ivanyuk, Fedor, Hambsch, Franz-Josef, and Carjan, Nicolae
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NUCLEAR fission , *KINETIC energy , *URANIUM , *CALIFORNIUM , *NUCLEAR liquid drop model - Abstract
The total deformation energy at the moment of the neck rupture for 236U and 252Cf is calculated using the Strutinsky's prescription and nuclear shapes described in terms of Cassinian ovals generalized by the inclusion of four additional shape parameters: α1, α2, α3, and α4. The corresponding fragment-mass distributions are estimated supposing that each point in the deformation space is occupied according to a canonical distribution. The energy distributions of fission fragments are calculated assuming the point-charge approximation for the Coulomb interaction of fission fragments. Finally, an alternative definition of the nuclear scission point configuration relying on the minimization of liquid drop energy (optimal shape method) is used. Both definitions lead, for these two nuclei, to a reasonably good agreement with the experimental data. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
4. Point-by-point model calculation of the prompt neutron multiplicity distribution ν(A) in the incident neutron energy range of multi-chance fission.
- Author
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Tudora, Anabella, Hambsch, Franz-Josef, and Tobosaru, Viorel
- Subjects
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NEUTRON multiplicity , *NEUTRON temperature , *NUCLEAR fission , *NEUTRON cross sections , *LEAD compounds - Abstract
Prompt neutron multiplicity distributions ?(A) are required for prompt emission correction of double energy (2E) measurements of fission fragments to determine pre-neutron fragment properties. The lack of experimental ν(A) data especially at incident neutron energies (En) where the multi-chance fission occurs impose the use of ν(A) predicted by models. The Point-by-Point model of prompt emission is able to provide the individual ν(A) of the compound nuclei of the main and secondary nucleus chains undergoing fission at a given En. The total ν(A) is obtained by averaging these individual ν(A) over the probabilities of fission chances (expressed as total and partial fission cross-section ratios). An indirect validation of the total ν(A) results is proposed. At high En, above 70MeV, the PbP results of individual ν(A) of the first few nuclei of the main and secondary nucleus chains exhibit an almost linear increase. This shape is explained by the damping of shell effects entering the super-fluid expression of the level density parameters. They tend to approach the asymptotic values for most of the fragments. This fact leads to a smooth and almost linear increase of fragment excitation energy with the mass number that is reflected in a smooth and almost linear behaviour of ν(A). [ABSTRACT FROM AUTHOR]
- Published
- 2017
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5. Neutron-multiplicity experiments for enhanced fission modelling.
- Author
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Al-Adili, Ali, Tarrío, Diego, Hambsch, Franz-Josef, Göök, Alf, Jansson, Kaj, Solders, Andreas, Rakapoulos, Vasileios, Gustavsson, Cecilia, Lantz, Mattias, Mattera, Andrea, Oberstedt, Stephan, Prokofiev, Alexander V., Sundén, Erik A., Vidali, Marzio, Österlund, Michael, and Pomp, Stephan
- Subjects
NUCLEAR fission ,NEUTRON multiplicity ,NUCLEAR models ,ISOTOPES ,NUCLEAR structure ,PROMPT neutrons - Abstract
The nuclear de-excitation process of fission fragments (FF) provides fundamental information for the understanding of nuclear fission and nuclear structure in neutron-rich isotopes. The variation of the prompt-neutron multiplicity, ?(A), as a function of the incident neutron energy (E
n ) is one of many open questions. It leads to significantly different treatments in various fission models and implies that experimental data are analyzed based on contradicting assumptions. One critical question is whether the additional excitation energy (Eexc ) is manifested through an increase of ν(A) for all fragments or for the heavy ones only. A systematic investigation of ν(A) as a function of En has been initiated. Correlations between prompt-fission neutrons and fission fragments are obtained by using liquid scintillators in conjunction with a Frisch-grid ionization chamber. The proof-of-principle has been achieved on the reaction 235U(nth,f) at the Van De Graff (VdG) accelerator of the JRC-Geel using a fully digital data acquisition system. Neutrons from252 Cf(sf) were measured separately to quantify the neutron-scattering component due to surrounding shielding material and to determine the intrinsic detector efficiency. Prelimenary results on ν(A) and spectrum in correlation with FF properties are presented. [ABSTRACT FROM AUTHOR]- Published
- 2017
- Full Text
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6. Prompt fission γ -ray data from spontaneous fission and the mechanism of fission-fragment de-excitation.
- Author
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Oberstedt, Stephan, Dragic, Aleksandar, Gatera, Angelique, Göök, Alf, Hambsch, Franz-Josef, and Oberstedt, Andreas
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SPONTANEOUS fission ,GAMMA rays ,NUCLEAR fission ,NUCLEAR reactor cores ,PROMPT neutrons ,NEUTRON multiplicity - Abstract
The investigation of prompt γ -ray emission in nuclear fission has a great relevance for the assessment of prompt heat generation in a reactor core and for the better understanding of the de-excitation mechanism of fission fragments. Some years ago experimental data was scarce and available only from a few fission reactions,
233,235 U(nth , f),239 Pu(nth , f), and252 Cf(sf). Initiated by a high priority data request published by the OECD/NEA a dedicated prompt fission γ -ray measurement program is being conducted at the Joint Research Centre Geel. In recent years we obtained new and accurate prompt fission γ -ray spectrum (PFGS) characteristics (average number of photons per fission, average total energy per fission and mean photon energy) from252 Cf(sf),235 U(nth, f) and239,241 Pu(nth, f) within 2% of uncertainty. In order to understand the dependence of prompt fission γ -ray emission on the compound nuclear mass and excitation energy, we started a first measurement campaign on spontaneously fissioning plutonium and curium isotopes. Results on PFGS characteristics from240,242 Pu(sf) show a dependence on the fragment mass distribution rather than on the average prompt neutron multiplicity, pointing to a more complex competition between prompt fission γ -ray and neutron emission. [ABSTRACT FROM AUTHOR]- Published
- 2017
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7. Local and global even-odd effects in prompt emission in fission.
- Author
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Giubega, Georgiana, Tudora, Anabella, and Hambsch, Franz-Josef
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ACTINIDE elements ,NUCLEAR fission ,NEUTRON emission ,SPONTANEOUS fission ,NUCLEAR fragmentation - Abstract
The investigation of the proton even-odd effects in prompt emission in fission for even-Z actinides revealed basic features of the global even-odd effect in prompt emission similar with those in fission fragment yields and some particular aspects, such as: (1) the even-odd effects in prompt emission are the result of two contributions: a dominant intrinsic even-odd effect due to the even-odd nuclear character of fragments reflected in their properties and a weak even-odd effect caused by the fragment distributions (over which the multi-parametric matrices are averaged); (2) oscillations with a periodicity of about 5 mass units are present in different prompt emission quantities corresponding to even-Z and odd-Z fragmentations independent on the size of the even-odd effect in the charge yield Y(Z). These oscillations are due to the periodicity of nuclear properties of fragments; (3) a local even-odd effect in prompt emission quantities has been recently investigated. Similarities between prompt emission quantities and fragment yields were found in the case of the local even-odd effect, too. The local even-odd effect in both fragment charge yields and prompt emission quantities exhibit a pronounced increase at asymmetry values corresponding to fragmentations in which the heavy fragment (Z = 50 and/or N = 82) or the light one (Z = 28) is magic. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
8. Measurement of high-energy prompt gamma-rays from neutron induced fission of U-235.
- Author
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Hiroyuki Makii, Katsuhisa Nishio, Kentaro Hirose, Orlandi, Riccardo, Léguillon, Romain, Tatsuhiko Ogawa, Torsten Soldner, Hambsch, Franz-Josef, Astier, Alain, Pollitt, Andrew, Petrache, Costel, Tsekhanovich, Igor, Mathieu, Ludovic, Aïche, Mourad, Frost, Robert, Czajkowski, Serge, Song Guo, and Köster, Ulli
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NUCLEAR fission ,GAMMA rays ,NEUTRONS ,URANIUM ,FISSION counters - Abstract
We have developed a new setup to measure prompt γ -rays from the
235 U(nth, f) reaction. The setup consists of two multi-wire proportional counters (MWPCs) to detect the fission fragments, two LaBr3 (Ce) scintillators to measure the γ -rays. The highly efficient setup was installed at the PF1B beam line of the Institut Laue Langevin (ILL). We have successfully measured the γ -ray spectrum up to about 20MeV for the fist time in neutron-induced fission. [ABSTRACT FROM AUTHOR]- Published
- 2017
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9. New prompt fission gamma-ray spectral data from 239Pu(nth, f) in response to a high priority request from OECD Nuclear Energy Agency.
- Author
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Gatera, Angélique, Belgya, Tamás, Geerts, Wouter, Göök, Alf, Hambsch, Franz-Josef, Lebois, Matthieu, Maróti, Boglárka, Oberstedt, Stephan, Oberstedt, Andreas, Postelt, Frederik, Liqiang Qi, Szentmiklósi, Laszló, Vidali, Marzio, and Zeiser, Fabio
- Subjects
SPONTANEOUS fission ,PHOTONS ,GAMMA rays ,NUCLEAR fission - Abstract
Benchmark reactor calculations have revealed an underestimation of γ -heat following fission of up to 28%. To improve the modelling of new nuclear reactors, the OECD/NEA initiated a nuclear data High Priority Request List (HPRL) entry for the major isotopes (
235 U,239 Pu). In response to that HPRL entry, we executed a dedicated measurement program on prompt fission γ -rays employing state-of-the-art lanthanum bromide (LaBr3) detectors with superior timing and good energy resolution. Our new results from252 Cf(sf),235 U(nth, f) and241 Pu(nth, f) provide prompt fission γ -ray spectra characteristics : average number of photons per fission, average total energy per fission and mean photon energy; all within 2% of uncertainty. We present preliminary results on239 Pu(nth, f), recently measured at the Budapest Neutron Centre and supported by the CHANDA Trans-national Access Activity, as well as discussing our different published results in comparison to the historical data and what it says about the discrepancy observed in the benchmark calculations. [ABSTRACT FROM AUTHOR]- Published
- 2017
- Full Text
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10. The new double energy-velocity spectrometer VERDI.
- Author
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Jansson, Kaj, Frégeau, Marc Olivier, Al-Adili, Ali, Göök, Alf, Gustavsson, Cecilia, Hambsch, Franz-Josef, Oberstedt, Stephan, and Pomp, Stephan
- Subjects
FISSION fragment spectrometers ,KINETIC energy ,NUCLEAR fission ,NEUTRON emission ,SPONTANEOUS fission - Abstract
VERDI (VElocity foR Direct particle Identification) is a fission-fragment spectrometer recently put into operation at JRC-Geel. It allows measuring the kinetic energy and velocity of both fission fragments simultaneously. The velocity provides information about the pre-neutron mass of each fission fragment when isotropic prompt-neutron emission from the fragments is assumed. The kinetic energy, in combination with the velocity, provides the post-neutron mass. From the difference between pre- and post-neutron masses, the number of neutrons emitted by each fragment can be determined. Multiplicity as a function of fragment mass and total kinetic energy is one important ingredient, essential for understanding the sharing of excitation energy between fission fragments at scission, and may be used to benchmark nuclear de-excitation models. The VERDI spectrometer design is a compromise between geometrical efficiency and mass resolution. The spectrometer consists of an electron detector located close to the target and two arrays of silicon detectors, each located 50 cm away from the target. In the present configuration pre-neutron and post-neutron mass distributions are in good agreement with reference data were obtained. Our latest measurements performed with spontaneously fissioning
252 Cf is presented along with the developed calibration procedure to obtain pulse height defect and plasma delay time corrections. [ABSTRACT FROM AUTHOR]- Published
- 2017
- Full Text
- View/download PDF
11. Even-odd effects in the prompt fission emission of even Z actinides.
- Author
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Tudora, Anabella, Hambsch, Franz-Josef, Giubega, Georgiana, and Visan, Iuliana
- Subjects
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NUCLEAR fission , *NUCLEAR reactions , *ACTINIDE elements , *NEUTRON temperature , *NUCLEAR energy - Abstract
The investigation of even-odd effects in the prompt emission of even Z actinides showed a sawtooth shape of ν(Z) with staggering in the asymmetric fission region. Average prompt emission quantities as a function of A, e.g. ν(A), of even Z fragmentations are higher than those of odd Z fragmentations and they exhibit oscillations with a periodicity of about 5 mass units in the asymmetric fission region. This periodicity is not due to the Z even-odd effect in fragment distributions. The even-odd effect in <ν>(TKE) is increasing with increasing TKE and it decreases with increasing mass of the fissioning nucleus. The global even-odd effect in total average prompt emission quantities is decreasing with increasing mass of the fissioning nucleus. In the case of an even-odd fissioning nucleus, 234U(n,f), the global even-odd effect in prompt emission quantities exhibits a very slow variation with the incident neutron energy. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
12. Photo-fission at the S-DALINAC.
- Author
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Göök, Alf, Barday, Roman, Chernykh, Maksym, Eckardt, Christian, Eichhorn, Ralf, Enders, Joachim, Hambsch, Franz-Josef, von Neumann-Cosef, Peter, Oberstedt, Andreas, Oberstedt, Stephan, Poltoratska, Yuliya, Richter, Achim, and Wagner, Markus
- Subjects
NUCLEAR fission ,ENERGY dissipation ,PARTICLES (Nuclear physics) ,NUCLEAR reactions ,NUCLEAR physics - Abstract
Experiments on photo-induced fission of
238 U and234 U using bremsstrahlung with endpoint energies between 6 MeV and 9 MeV have been carried out at the superconducting Darmstadt electron linear accelerator S-DALINAC. A twin Frisch grid ionization chamber has been used to determine energy and mass distributions via the 2E-technique. The fission fragment emission angle, which is used to correct for energy loss in the target and backing material for a correct determination of fragment energy and mass, is deduced from the time difference between cathode and anode signals. The research program including the foreseen search for parity violation in photo-induced fission and first experimental results will be presented. [ABSTRACT FROM AUTHOR]- Published
- 2009
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13. FISSION RESEARCH AT IRMM.
- Author
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HAMBSCH, FRANZ-JOSEF
- Subjects
FISSION neutrons ,INSTITUTE for Reference Materials & Measurements (Geel, Belgium) ,NEUTRON cross sections ,SCISSION point model ,NUCLEAR fission - Published
- 2008
14. Calculation of Prompt Neutron Multiplicities and Spectra for Several Actinides.
- Author
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Hambsch, Franz-Josef, Tudora, Anabella, Vladuca, Gheorghita, and Oberstedt, Stephan
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NUCLEAR fission , *NUCLEAR reactions , *NEUTRONS spectra , *NEUTRON scattering , *ACTINIDE elements , *RADIOACTIVE substances , *NUCLEAR physics - Abstract
The prompt fission neutron multiplicity and spectra of actinides are nuclear data of crucial importance. Based on experimental fission yield and total kinetic energy data, new calculations for the prompt neutron multiplicity and spectra for 238U(n,f), 237Np(n,f) in the incident neutron energy range up to the second chance fission threshold, for 238U(n,f), up to 50 MeV, and for 252Cf(SF) have been performed. For the first time the multi-modality of the fission process was taken into account up to the second fission chance (about 6 MeV). Additionally, for some isotopes a more realistic fission fragment residual temperature distribution as well as an anisotropy of the prompt neutron emission led to improved agreement between the calculation and experimental results. Also, the range of fission fragment pairs entering in the multiplicity and spectrum model was extended over the entire experimental fission-fragment mass range. This led to an improved version of the Los Alamos (LA) model and especially to an improved determination of the input model parameters. In addition the LA model is extended towards higher incident neutron energy, where the fission of compound nuclei formed by charged particle emission occurs. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
15. Possible Fine Structure in the Delayed Neutron Yields in the Resonance Region for Pu-239.
- Author
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Ohsawa, Takaaki, Hambsch, Franz-Josef, and Torii, Takayuki
- Subjects
- *
NEUTRONS , *NUCLEAR fission , *NUCLEAR reactions , *THERMAL neutrons , *NUCLEAR reactors , *NUCLEAR physics - Abstract
A method of analysis of fluctuation in the delayed neutron yield on the basis of the multimodal fission model was applied to the low-energy resolved resonances for Pu-239. The present calculation using recent data of the fluctuation of the mode branching ratios for the resolved resonances showed both positive and negative resonance structure in the delayed neutron yield relative to the thermal neutron value. This is in contrast to the U-235 case, for which mainly negative dips of about -3.5% were predicted. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
16. Prompt Fission Neutron Emission in Resonance Fission of 239Pu.
- Author
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Hambsch, Franz-Josef, Varapai, Natallia, Zeinalov, Shakir, Oberstedt, Stephan, and Serot, Olivier
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NUCLEAR fission , *NEUTRONS , *NEUTRON counters , *SCINTILLATION counters , *NEUTRON resonance , *NUCLEAR physics - Abstract
The prompt neutron emission probability from neutron-induced fission in the resonance region is being investigated at the time-of-flight facility GELINA of the IRMM. A double Frisch-gridded ionization chamber is used as a fission-fragment detector. For the data acquisition of both the fission-fragment signals as well as the neutron detector signals the fast digitization technique has been applied. For the neutron detection, large-volume liquid scintillation detectors from the DEMON collaboration are used. A specialized data analysis program taking advantage of the digital filtering technique has been developed to treat the acquired data. Neutron multiplicity investigations for actinides, especially in resonance neutron-induced fission, are rather scarce. They are, however, important for reactor control and safety issues as well as for understanding the basic physics of the fission process. Fission yield measurements on both 235U and 239Pu without prompt neutron emission coincidence have shown that fluctuation of the fission-fragment mass distribution exists from resonance to resonance, larger in the case of 235U. To possibly explain these observations, the question now is whether the prompt neutron multiplicity shows similar fluctuations with resonance energy. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
17. Nuclear Fission Research at IRMM.
- Author
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Hambsch, Franz-Josef
- Subjects
- *
NUCLEAR fission , *NUCLEAR reactions , *COLLISIONS (Nuclear physics) , *NUCLEAR energy , *FISSION cross sections , *NUCLEAR cross sections , *NUCLEAR physics , *PHYSICS - Abstract
The Institute for Reference Materials and Measurements (IRMM) will celebrate its 45th anniversary in 2005. With its 150-MeV Geel Electron Linear Accelerator (GELINA) and 7-MV Van de Graaff accelerator as multi-purpose neutron sources, it served the nuclear physics community for this period. The research in the field of nuclear fission was focused in recent years on both the measurement and calculation of fission cross sections, and the measurement of fission fragment properties. Fission cross sections were determined for 233Pa and 234U; the fission process was studied in the resolved resonance region of 239Pu(n,f) and for 251Cf(nth,f). These measurements derive their interest from accelerator driven systems, the thorium fuel cycle, high temperature reactors, safety issues of current reactors, and basic physics. The measurements are supported by several modeling efforts that aim at improving model codes and nuclear data evaluation. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
18. Preface.
- Author
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Hambsch, Franz-Josef, Ruskov, Ivan, and Carjan, Nicolae
- Subjects
- *
NUCLEAR fission , *GAMMA rays - Published
- 2018
- Full Text
- View/download PDF
19. Prompt neutrons in correlation with fission fragments from 235U(n,f).
- Author
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Göök, Alf, Hambsch, Franz-Josef, Oberstedt, Stephan, and Vidali, Marzio
- Subjects
- *
NEUTRONS , *IONIZATION chambers , *NUCLEAR fission - Abstract
Improved knowledge of prompt emission in fission has significant implications for our understanding of the fission process. It is also important for improving nuclear data evaluation, with impact on applications. The correlation between prompt neutrons and fragments emitted in binary neutron induced fission of 235U has been studied at the GELINA facility. The experiment employs an array of proton recoil scintillators and a position-sensitive twin ionization chamber. This experimental arrangement permits measurement of the correlations between neutron emission, fragment angle, and mass and energy of the fission fragments. In this article, we present results on prompt fission neutron energy and multiplicity correlations with mass and total kinetic energy of the fission fragments. Results from the present measurement shows distinct differences compared to earlier studies of the correlated fission fragment and prompt neutron emission quantities. The differences with respect to earlier investigations are interpreted as improved fission fragment energy resolution in the present measurement. The present result supports several recent model calculations of prompt neutron and fission fragment correlations. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
20. High precision measurements on fission-fragment de-excitation.
- Author
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Oberstedt, Stephan, Gatera, Angélique, Geerts, Wouter, Göök, Alf, Hambsch, Franz-Josef, Vidali, Marzio, and Oberstedt, Andreas
- Subjects
- *
NUCLEAR fission , *NUCLEAR energy , *ISOTOPES , *MULTIPLICITY of nuclear particles , *NUCLEAR reactions - Abstract
In recent years nuclear fission has gained renewed interest both from the nuclear energy community and in basic science. The first, represented by the OECD Nuclear Energy Agency, expressed the need for more accurate fission cross-section and fragment yield data for safety assessments of Generation IV reactor systems. In basic science modelling made much progress in describing the de-excitation mechanism of neutron-rich isotopes, e.g. produced in nuclear fission. Benchmarking the different models require a precise experimental data on prompt fission neutron and γ -ray emission, e.g. multiplicity, average energy per particle and total dissipated energy per fission, preferably as function of fission-fragment mass and total kinetic energy. A collaboration of scientists from JRC Geel (formerly known as JRC IRMM) and other institutes took the lead in establishing a dedicated measurement programme on prompt fission neutron and γ -ray characteristics, which has triggered even more measurement activities around the world. This contribution presents new advanced instrumentation and methodology we use to generate high-precision spectral data and will give a flavour of future data needs and opportunities. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
21. Fission Product Yields Data Current status and perspectives : Summary report of an IAEA Technical meeting
- Author
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Dimitriou, Paraskevi, Hambsch, Franz-Josef, and Pomp, Stephan
- Subjects
Subatomär fysik ,Subatomic Physics ,Nuclear fission ,fission yields ,nuclear data - Abstract
A Technical Meeting on Fission Product Yields Data: current status and perspectives, was held from 23 to 26 May 2016, at the IAEA, Vienna. The purpose of the meeting was to review the current status of Fission Product Yield data, and discuss the progress in measurements, theories, evaluation and covariances. The presentations, technical discussions and recommendations of the meeting are given in detail in this summary report.
- Published
- 2016
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