A5053722759- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Nuclear physics research studies
- Nuclear Materials and Properties
- Radioactive contamination and transfer
- Medical Imaging Techniques and Applications
- Radiation Effects in Electronics
- Rare-earth and actinide compounds
- Atomic and Subatomic Physics Research
- Radiation Therapy and Dosimetry
Swedish Radiation Safety Authority
2020
European Commission
2011-2018
Studsvik (Sweden)
2018
Extreme Light Infrastructure - Nuclear Physics
2018
Joint Research Center
2009-2016
Chalmers University of Technology
2011-2015
Örebro University
2009-2011
Örebro University Hospital
2010
We present results from new spectral prompt $\ensuremath{\gamma}$-ray measurements the spontaneous fission of ${}^{252}$Cf. Apart one recent experiment, about four decades have passed since last dedicated experiments were reported in literature. Hence, there was a need for revision. measured $\ensuremath{\gamma}$ rays with both cerium-doped LaBr${}_{3}$ and CeBr${}_{3}$ scintillation detectors, which exhibit excellent timing good energy resolution. The emission yield determined to be...
In this paper we present results from measurements of prompt $\ensuremath{\gamma}$ rays the thermal neutron induced fission ${}^{235}$U. Photons were measured in coincidence with fragments cerium-doped LaCl${}_{3}$ and LaBr${}_{3}$ as well CeBr${}_{3}$ scintillation detectors, which offer an intriguing combination excellent timing resolution good resolving power. The spectra all employed detectors are agreement respect to their shapes. Characteristic parameters extracted for a...
In this paper we report on a new study of prompt $\ensuremath{\gamma}$-rays from the spontaneous fission ${}^{252}\mathrm{Cf}$. Photons were measured in coincidence with fragments by employing four different lanthanide halide scintillation detectors. Together results previous work ours, determined characteristic parameters high precision, such as average $\ensuremath{\gamma}$-ray multiplicity...
In this paper we present results from the first high-precision prompt-$\ensuremath{\gamma}$-ray spectral measurements reaction $^{241}\mathrm{Pu}$(${n}_{\mathrm{th}}$, $f$). Apart one recent experiment, no data are reported in literature for fissioning system, which motivated a new dedicated experiment. We have measured prompt-fission $\ensuremath{\gamma}$ rays with three cerium-doped $\mathrm{La}{\mathrm{Br}}_{3}$ (two...
In recent years the measurement of prompt fission $\gamma$ -ray spectra (PFGS) has gained renewed interest, after about forty since first comprehensive studies reactions 235U(n th , f), 239Pu(n ,f) and 252Cf(sf). The renaissance was initiated by requests for new values especially multiplicity average total energy release per in neutron-induced 235U 239Pu. Both isotopes are considered most important ones with respect to modeling innovative cores required Generation-IV reactors, majority...
Aircraft crew are one of the groups radiation workers which receive highest annual exposure to ionizing radiation. Validation computer codes used routinely for calculation due cosmic and observation nonpredictable changes in level solar energetic particles, requires continuous measurements onboard aircraft. Appropriate calibration suitable instruments is crucial, however, very complex atmospheric field there no single reference covering all particles energies involved. Further...
In this work we give an overview of our investigations prompt γ-ray emission in nuclear fission. This was conducted during the last five years response to a high priority data request formulated by OECD/NEA. The aim reveal deficiencies responsible for severe under-prediction γ heating reactor cores. We obtained new fission spectral (PFGS) 252Cf(SF) as well thermal-neutron induced on 235U(nth,f) and 241Pu(nth,f). addition, first PFGS measurements with fast-neutron beam were accomplished, too....
In this work we present first results from measurements of prompt fission γ-rays the spontaneous in 252Cf. New and accurate data on corresponding reactions 235U(nth,f) 239Pu(nth,f) are highly demanded for modeling new Generation-IV nuclear reactor systems. For these experiments employed scintillation detectors made out materials (LaBr3, LaCl3 CeBr3), whose properties were necessary to know order obtain reliable results. Hence, have characterized detectors. all important outshine...
In this paper we talk about our work in developing a method to measure and analyze prompt fission γ-rays, as well re- sults from the measurement of three different reactions, namely 252Cf(SF), 235U(nth, f) 241Pu(nth, f). The first two had, at beginning measurements, not been examined since early 1970s, last reaction had never measured. Our results show slight improvement over evaluated data-tables comparison with benchmark experiments, but can still explain all underestimation witnessed....
The knowledge of prompt fission $\ensuremath{\gamma}$-ray emission has been major interest in reactor physics for a few years. Only experimental spectra were published until now fast-neutron-induced fission, and measurements would be also valuable order to improve our understanding the process. A simple method was used measure first up 10 MeV. In this approach, $\ensuremath{\gamma}$ rays are measured with bismuth germanate (BGO) detector which offers two significant advantages respect other...
Systematics from 2001, describing prompt-fission $\ensuremath{\gamma}$-ray spectra (PFGS) characteristics as a function of mass and atomic number the fissioning system, was revisited parameters were revised, based on recent experimental results. Although originally expressed for spontaneous thermal-neutron induced fission, validity fast neutrons assumed applied to predict PFGS reaction $n+^{238}\mathrm{U}$ up incident neutron energies ${E}_{n}=20\phantom{\rule{0.16em}{0ex}}\mathrm{MeV}$. The...
For the development of future nuclear fission applications and for a responsible handling waste a-priori assessment fission-fragments’ heat production toxicity is fundamental necessity. The success an indispensable modelling process strongly depends on good understanding particular mechanism scission, mass fragmentation partition excitation energy. Experimental observables are fission-fragment properties like mass- energy-distributions, prompt neutron as well γ-ray multiplicities emission...
LICORNE is a new neutron source recently installed at the tandem accelerator of Institut de Physique Nucléaire d'Orsay, where Li7-beam used to bombard hydrogen-containing target produce an intense forward-directed beam. The directionality beam, which unique characteristic LICORNE, will permit installation γ-ray detectors dedicated investigation fission fragment de-excitation are unimpeded by neutrons from source. A first experimental program focus on measurement prompt emission in...
Recently developed cerium-doped lanthanum bromide (LaBr3: Ce) scintillation detectors have shown to possess promising properties with respect the detection of γ-rays compared previously known materials. In this work however, we demonstrate how these may be used obtain information not only about γ-rays, but also neutrons, i.e. thinking"inside" and"outside" box, respectively. For purpose were detected in coincidence fission fragments and both their energy time-of-flight relative instant a...
In a recent measurement of prompt γ rays from the spontaneous fission 252 Cf an experimental setup was chosen that allowed study angular correlations between and nuclei which they were emitted. The observed distribution then analyzed to estimate relative contributions radiation different multipolarity. First preliminary results are presented compared previous correlation measurements processes calculations with Monte Carlo Hauser-Feshbach code FIFRELIN.
In a recent measurement of prompt γ rays from the spontaneous fission 252 Cf an experimental setup was chosen that allowed study angular correlations between and nuclei which they were emitted. The observed distribution then analyzed to estimate relative contributions radiation different multipolarity. From we hope obtain more detailed information about early stage de-excitation process fragments, right after neutron emission. First preliminary results are presented below.
Systematics from 2001, describing prompt fission γ-ray spectra (PFGS) characteristics as function of mass and atomic number the fissioning system, has been revisited parameters have revised, based on recent experimental results.Although originally expressed for spontaneous thermal neutron induced fission, validity fast neutrons was assumed applied to predict PFGS reaction n + 238 U up incident energies E = 20 MeV.The results this work are compared with preliminary results.
The properties of cylindrical 1.5″×1.5″LaCl3:Ce scintillation detectors were determined. For the energy resolution values between 3.8 and 4.2% at 662 keV observed, following expected E−1/2 behavior. intrinsic full peak efficiency was determined to be more than 50% higher for NaI:Tl same size. observed timing 60Co estimated 441 ps activity lanthanum crystals assessed.
In recent years JRC-IRMM has been investigating fission cross-sections of 240,242Pu in the fast-neutron energy range relevant for innovative reactor systems and requested High Priority Request List (HPRL) OECD/Nuclear Energy Agency (NEA). addition to that, prompt neutron multiplicities are being investigated major isotopes 235U, 239Pu neutron-resonance region using a newly developed scintillation detector array (SCINTIA) an modification Frisch-grid ionisation chamber fission-fragment...