A5013091184- Nuclear Physics and Applications
- Nuclear physics research studies
- Spectroscopy and Laser Applications
- Atomic and Molecular Physics
- Mechanical and Optical Resonators
- Photoacoustic and Ultrasonic Imaging
- Particle accelerators and beam dynamics
- Thermography and Photoacoustic Techniques
- Radiation Detection and Scintillator Technologies
- Quantum Chromodynamics and Particle Interactions
- Advanced Chemical Physics Studies
- Mass Spectrometry Techniques and Applications
- Plasma Diagnostics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Inorganic Fluorides and Related Compounds
- Electron and X-Ray Spectroscopy Techniques
- Terahertz technology and applications
- Radioactive contamination and transfer
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Particle physics theoretical and experimental studies
- Molecular Spectroscopy and Structure
- Radioactive Decay and Measurement Techniques
- Laser-induced spectroscopy and plasma
- Advanced Semiconductor Detectors and Materials
Tampere University
2014-2024
Tampere University of Applied Sciences
2013
Comisión Nacional de Energía Atómica
1971-1989
Université Paris-Sud
1980
Université Paris Cité
1980
Centre National de la Recherche Scientifique
1980
Institut de Physique
1978-1979
RTX (United States)
1968
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
1965
A quantitative and simultaneous measurement of K, KCl, KOH vapors from a burning fuel sample combusted in single particle reactor was performed using collinear photofragmentation atomic absorption spectroscopy (CPFAAS) with time resolution 0.2 s. The previously presented CPFAAS technique extended this work to cover two consecutive fragmentation pulses for the KCl KOH. spectral overlapping spectra is discussed, linear equation system correction interference introduced. detection limits KOH, K...
Solid-state detectors have been used to perform on-line measurements of $\ensuremath{\gamma}$-ray and conversion-electron intensities in $^{133,\phantom{\rule{0ex}{0ex}}135,\phantom{\rule{0ex}{0ex}}136}\mathrm{Xe}$, $^{135,\phantom{\rule{0ex}{0ex}}137,\phantom{\rule{0ex}{0ex}}139}\mathrm{Cs}$, $^{138}\mathrm{Ba}$. Conversion coefficients were determined for 37 transitions. $\mathrm{Log}\mathrm{ft}$ values calculated on the basis reported level schemes. The deduced multipolarities...
The $\ensuremath{\gamma}$ rays and conversion electrons following the ${\ensuremath{\beta}}^{\ensuremath{-}}$ decay of $^{93}\mathrm{Kr}$, $^{93}\mathrm{Rb}$, $^{93}\mathrm{Sr}$ have been measured by applying on-line mass-separation techniques to $^{235}\mathrm{U}$ fission products. Level schemes for three daughter nuclei are proposed based on study $\ensuremath{\gamma}$-singles, $\ensuremath{\gamma}\ensuremath{\gamma}$-coincidence, internal-conversion electron spectra. Internal-conversion...
We report on sensitive tunable laser absorption spectroscopy using a multipass gas cell and solid-state photoacoustic optical power detector. Unlike (PAS), this method readily allows low pressure for high spectral selectivity free flow continuous measurements. Our detector has large linear dynamic range can be used at almost any wavelength, including the middle infrared THz regions that are challenging to cover with traditional detectors. Furthermore, our approach compensation of drifts...
We present an experimental comparison of photoacoustic responsivities common highly absorbing carbon-based materials. The was carried out with parameters relevant for power detectors and Fourier-transform infrared (FTIR) spectroscopy: we covered a broad wavelength range from the visible red to far (633 nm 25 um) regime low acoustic frequencies (< 1 kHz). investigated materials include candle soot-based coating, black paint coating two different carbon nanotube coatings. Of these, low-cost...
Optical power measurements are needed in practically all technologies based on light. Here, we report a general-purpose optical detector the photoacoustic effect. incident detector's black absorber produces an acoustic signal, which is further converted into electrical signal using silicon-cantilever pressure transducer. We demonstrate exceptionally large spectral coverage from ultraviolet to far infrared, with possibility for extension terahertz region. The linear dynamic range of reaches...
A program for the automatic analysis of Ge(Li) gamma-ray spectra is described. Owing to its reduced size it can be used on small (16 K memory words) computers. For design program, steps manual methods have been followed as closely possible. Most subroutines are written in Fortran II language.
In this article, we present a novel method for the elemental analysis of airborne aerosol particles using electrodynamic balance (EDB) trapping followed by laser-induced breakdown spectroscopy. The setup consists newly designed corona-based charger, double-ring trap and optical arrangement Experimental laboratory measurements show that minimum particle size successful is 1 µm in diameter, concentration order particle/cm3. addition to method, will results on charging efficiency developed...
Sources of mass-134 iodine have been produced in $^{235}\mathrm{U}$ fission and studied on line the Buenos Aires Isotope Separator On Line project using Ge(Li) Si(Li) detectors. A transition 272.2 \ifmmode\pm\else\textpm\fi{} 0.3 keV, with ${T}_{\frac{1}{2}}=3.56\ifmmode\pm\else\textpm\fi{}0.08$ min, ${\ensuremath{\alpha}}_{K}=0.20\ifmmode\pm\else\textpm\fi{}0.03$, $\frac{K}{L}+\ensuremath{\cdots}=2.6\ifmmode\pm\else\textpm\fi{}0.3$, thus $E3(+\ensuremath{\le}1%M4)$ character, was determined...
The decay of $^{86}\mathrm{Br}$ has been studied with high-resolution Ge(Li) detectors by applying online mass-separation techniques to $^{235}\mathrm{U}$ fission products. 19 transitions were positively assigned this through half-life comparisons, and for 10 them direct measurements the performed, yielding an average value 59 \ifmmode\pm\else\textpm\fi{} 4 sec. Levels $^{86}\mathrm{Kr}$ are proposed at ($({J}^{\ensuremath{\pi}}...
Level schemes for $^{91}\mathrm{Rb}$ and $^{91}\mathrm{Sr}$ are proposed based on the study of $\ensuremath{\beta}$ decay $^{91}\mathrm{Kr}$ $^{91}\mathrm{Rb}$, respectively. The samples were obtained using on-line mass-separation techniques applied to $^{235}\mathrm{U}$ fission products. $\ensuremath{\gamma}$-, $\ensuremath{\beta}$-, x-ray singles spectra, as well ($\ensuremath{\gamma},\ensuremath{\gamma}$) ($\ensuremath{\beta},\ensuremath{\gamma}$) coincidence taken with Ge(Li) Si(Li)...
Samples of $^{123}$,125Cd were obtained by on-line mass separator techniques applied to natural U fast-neutron fission products. Special emphasis was devoted half-life measurements the decays and level schemes $^{123}$,125In. Two half-lives 2.12\ifmmode\pm\else\textpm\fi{}0.03 s 1.81\ifmmode\pm\else\textpm\fi{}0.03 have been measured for $^{123}\mathrm{Cd}$. Also, $^{125}\mathrm{Cd}$ two 0.68\ifmmode\pm\else\textpm\fi{}0.04 0.48\ifmmode\pm\else\textpm\fi{}0.03 observed measured. Four...
A sensitive photoacoustic detection approach employing a silicon cantilever is investigated for power measurement of electromagnetic radiation. The technique which actuated by pressure waves generated through radiation-induced heat depicts high sensitivity considerably large spectral range from 325 nm to 1523 nm. implemented method shows linear response in the radiation 15 nW 6 mW demonstrating dynamic almost six orders magnitude. numerical model has been developed analyze and optimize...
Fast neutrons were produced with deuteron beams of 27 MeV and 800 nA from the $^{9}\mathrm{Be}$${(}^{2}$H,n) reaction. These induced, in turn, natural-uranium fission. Samples $^{123}\mathrm{Ag}$ obtained by means on-line mass separation techniques applied to fission products. The half-life ${\ensuremath{\beta}}^{\mathrm{\ensuremath{-}}}$ decaying was measured be 0.35\ifmmode\pm\else\textpm\fi{}0.04 s agreement previously reported data. energy level scheme $^{123}\mathrm{Cd}$ built...
Samples of $^{129}\mathrm{Sn}$ and $^{129}\mathrm{Sb}$ were obtained by on-line mass-separation techniques applied to $^{235}\mathrm{U}$ thermal-fission products. Half-lives (6.9\ifmmode\pm\else\textpm\fi{}0.1) (2.5\ifmmode\pm\else\textpm\fi{}0.1) min have been measured for the beta decays. Decay schemes are proposed based on gamma-ray energies intensities gamma-gamma coincidence results. A new half-life (17.7\ifmmode\pm\else\textpm\fi{}0.1) min, besides well known 4.4 h one, was observed in...
The energy levels of $^{138}\mathrm{Cs}$ populated in the decay 14.2-min $^{138}\mathrm{Xe}$ have been investigated using on-line techniques. $\ensuremath{\gamma}$-ray energies and intensities range 0.1-2.5 MeV were determined with Ge(Li) detectors. Using a Si(Li) x-ray detector, 10.7-keV $\ensuremath{\gamma}$ ray was found its $L$-shell conversion coefficient to be 150 \ifmmode\pm\else\textpm\fi{} 70. Conversion-electron lines measured detector following $K$ coefficients calculated...
A level scheme for $^{131}\mathrm{Sb}$ is proposed taking into account the gamma-ray energy and intensity gamma-gamma coincidences obtained in decay of $^{131}\mathrm{Sn}$. The samples were using on-line mass-separation techniques applied to $^{235}\mathrm{U}$ thermal-neutron fission products. half-life $^{131}\mathrm{Sn}$ was measured be 61\ifmmode\pm\else\textpm\fi{}1 s. structure compared with a particle-core coupling calculation quadrupole protonneutron interaction.RADIOACTIVITY (from...
We report the photoacoustic (PA) response in terahertz (THz) range by employing a detection process actuated with silicon cantilever pressure sensor and carbon-based radiation absorber. The relies on mechanical of cantilever, when volume carrier gas inside PA cell expands heat produced detector interferometrically monitors movement to generate signal. selected absorber material highest THz responsivity for detailed studies at 1.4 (214 µm wavelength). observed responsivities two different...