Search

Your search keyword '"A. J., Kordyasz"' showing total 6 results
Start Over Author "A. J., Kordyasz"
6 results on '"A. J., Kordyasz"'

1. Measurement of radioactivity in buildings with a large-area silicon detector

Author

A J Kordyasz

Subjects
Physics, business.product_category, Physics::Instrumentation and Detectors, business.industry, Detector, General Physics and Astronomy, chemistry.chemical_element, Radon, Education, Filter (large eddy simulation), Optics, chemistry, Vacuum cleaner, Silicon detector, business, Background radiation
Abstract

Natural background radiation is mainly due to radon, but how much is in the air around us? A figure can be calculated by using a silicon detector to measure a particles emitted from the dust deposited on a filter through which air is drawn by a vacuum cleaner. The detector described here also allows measurement of very low macroscopic surface activities.

Published
1996
Full Text
View/download PDF

3. Scattering of protons by fission fragments

Author

A J Kordyasz

Subjects
Physics, Nuclear and High Energy Physics, Fission, Scattering, Astrophysics::High Energy Astrophysical Phenomena, Final energy, Nuclear Theory, General Physics and Astronomy, Schrödinger equation, Nuclear physics, symbols.namesake, symbols, Polar, Atomic physics, Nuclear Experiment, Current density
Abstract

The scattering of protons emitted from the neck area of the fissioning nucleus by fission fragments has been computed by solving the time-independent part of the Schrodinger equation for the symmetric fission of 235U+n. The current density (j=(h/2 pi )/2mi)( psi *GRAD psi - Psi GRAD psi *) is calculated as a function of the final energy of the protons and the interfragment distance. It was found that the ratio of 'polar emission' to 'equatorial emission' decreases with the interfragment distance. The possibility of explaining the 'polar emission' and 'equatorial emission' phenomena as a scattering of protons by fission fragments is discussed.

Published
1980
Full Text
View/download PDF

4. A wavepacket description of ternary fission

Author

A J Kordyasz

Subjects
Physics, Nuclear and High Energy Physics, Fission, Wave packet, General Physics and Astronomy, Absolute value, Function (mathematics), Schrödinger equation, symbols.namesake, Quantum mechanics, Contour line, symbols, Atomic physics, Ternary fission, Axial symmetry
Abstract

Ternary fission is approximated by the time-dependent evolution of the alpha-particle wavepacket in the potential generated by two moving fission fragments from ternary fission of 235U+n. The time-dependent Schrodinger equation is solved numerically by a finite elements method on an axially symmetric spatial mesh. The time-dependent evolution of the wavepacket is presented. It is illustrated by contour maps of the absolute value of current density j=mod.((h/4im pi )( psi *grad psi - psi grad psi *)). The angular distribution computed using the wavepacket function psi is compared with the experimental data. The calculated ratio of 'polar emission' to 'equatorial emission' is in good agreement with experiment.

Published
1981
Full Text
View/download PDF

5. Low-temperature technique of thin silicon ion implanted epitaxial detectors

Author

Giovanni Casini, Simone Valdré, Gabriele Pasquali, M. Teodorczyk, A. Chbihi, N. Le Neindre, Zbigniew Sosin, Mariano Vigilante, J.D. Frankland, P. Kulig, E. Bonnet, M. Guerzoni, Maurizio Bini, E. Scarlini, E. Vanzanella, Dariusz Lipiński, Bernard Borderie, A. Grzeszczuk, Z. Khabanowa, P. Edelbruck, M. Cinausero, M. Parlog, G. Spadaccini, Ł. Kordyasz, Andrea Stefanini, Alessandro Olmi, R. Bougault, K. Ga̧sior, M. Gajewski, J. Sarnecki, A.J. Kordyasz, A. Boiano, R. Alba, M.F. Rivet, D. Gruyer, M. Bruno, T. Twaróg, A. Zagojski, A. Brzozowski, G. Pastore, A. Meoli, Luca Morelli, T. Marchi, M. Kowalczyk, A. Bednarek, D. Santonocito, C. Maiolino, A. Ordine, K. Krzyżak, S. Serra, Y. Merrer, K. J. Tarasiuk, E. Vient, F. Salomon, Giacomo Poggi, H. Wodzińska, F. Gramegna, G. Tortone, W. Zipper, O. Lopez, Silvia Piantelli, Elio Rosato, Tomasz Kozik, G. Ademard, Sandro Barlini, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Fazia Collaboration, A. J., Kordyasz, N., Le Neindre, M., Parlog, G., Casini, R., Bougault, G., Poggi, A., Bednarek, M., Kowalczyk, O., Lopez, Y., Merrer, E., Vient, J. D., Frankland, E., Bonnet, A., Chbihi, D., Gruyer, B., Borderie, G., Ademard, P., Edelbruck, M. F., Rivet, F., Salomon, M., Bini, S., Valdré, E., Scarlini, G., Pasquali, G., Pastore, S., Piantelli, A., Stefanini, A., Olmi, S., Barlini, A., Boiano, Rosato, Elio, A., Meoli, A., Ordine, Spadaccini, Giulio, G., Tortone, Vigilante, Mariano, E., Vanzanella, M., Bruno, S., Serra, L., Morelli, M., Guerzoni, R., Alba, D., Santonocito, C., Maiolino, M., Cinausero, F., Gramegna, T., Marchi, T., Kozik, P., Kulig, T., Twaróg, Z., Sosin, K., Ga??sior, A., Grzeszczuk, W., Zipper, J., Sarnecki, D., Lipi??ski, H., Wodzi??ska, A., Brzozowski, M., Teodorczyk, M., Gajewski, A., Zagojski, K., Krzy??ak, K. J., Tarasiuk, Z., Khabanowa, Kordyasz, ?. ?., Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Silicon, 010308 nuclear & particles physics, Detector, Analytical chemistry, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Epitaxy, 01 natural sciences, Particle detector, Charged particle, Ion, Semiconductor detector, Ion implantation, chemistry, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Atomic physics, 010306 general physics
Abstract

A new technique of large-area thin ion implanted silicon detectors has been developed within the R&D performed by the FAZIA Collaboration. The essence of the technique is the application of a low-temperature baking process instead of high-temperature annealing. This thermal treatment is performed after B+ ion implantation and Al evaporation of detector contacts, made by using a single adjusted Al mask. Extremely thin silicon pads can be therefore obtained. The thickness distribution along the X and Y directions was measured for a prototype chip by the energy loss of α-particles from 241Am (〈E α 〉 = 5.5 MeV). Preliminary tests on the first thin detector (area ≈ 20 × 20 mm2) were performed at the INFN-LNS cyclotron in Catania (Italy) using products emitted in the heavy-ion reaction 84Kr (E = 35 A MeV) + 112Sn. The ΔE − E ion identification plot was obtained using a telescope consisting of our thin ΔE detector (21 μm thick) followed by a typical FAZIA 510 μm E detector of the same active area. The charge distribution of measured ions is presented together with a quantitative evaluation of the quality of the Z resolution. The threshold is lower than 2 A MeV depending on the ion charge.

Published
2015
Full Text
View/download PDF

6. Progresses in the pulse shape identification with silicon detectors within the FAZIA Collaboration

Author

J.A. Dueñas, Maurizio Bini, Giovanni Casini, V. L. Kravchuk, A. Ordine, B. Borderie, R. Bougault, R. Berjillos, Giacomo Poggi, Tomasz Kozik, A. Chbihi, P. Edelbruck, Ismael Martel, G. Tobia, E. Scarlini, N. Le Neindre, Gabriele Pasquali, Sandro Barlini, A.J. Kordyasz, M. Bruno, G. Spadaccini, E. Wanlin, S. Carboni, O. Lopez, C. Huss, E. Rosato, L. Bardelli, M. D'Agostino, Luca Morelli, M. F. Rivet, F. Gramegna, Julien Gautier, Mariano Vigilante, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), FAZIA, L., Bardelli, M., Bini, G., Casini, P., Edelbruck, G., Pasquali, G., Poggi, S., Barlini, R., Berjillo, B., Borderie, R., Bougault, M., Bruno, S., Carboni, A., Chbihi, M., D’Agostino, J. A., Duena, J. M., Gautier, F., Gramegna, C., Hu, A. J., Kordyasz, T., Kozik, V. L., Kravchuk, N., Le Neindre, O., Lopez, I., Martel, L., Morelli, A., Ordine, M. F., Rivet, Rosato, Elio, E., Scarlini, Spadaccini, Giulio, G., Tobia, Vigilante, Mariano, E., Wanlin, Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), L. Bardelli, M. Bini, G. Casini, P. Edelbruck, G. Pasquali, G. Poggi, S. Barlini, R. Berjillo, B. Borderie, R. Bougault, M. Bruno, S. Carboni, A. Chbihi, M. D'Agostino, J.A. Dueña, J.M. Gautier, F. Gramegna, C. Hu, A.J. Kordyasz, T. Kozik, V.L. Kravchuk, N. Le Neindre, O. Lopez, I. Martel, L. Morelli, A. Ordine, M.F. Rivet, E. Rosato, E. Scarlini, G. Spadaccini, G. Tobia, M. Vigilante, and E. Wanlin

Subjects
Nuclear and High Energy Physics, Silicon, SILICON DETECTORS, Phase (waves), chemistry.chemical_element, 01 natural sciences, Particle identification, Optics, Crystal orientation effects, Electrical resistivity and conductivity, 0103 physical sciences, Pulse shape analysis, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Solid state detectors, 010306 general physics, Instrumentation, Physics, Digital electronics, 010308 nuclear & particles physics, business.industry, Detector, Digital sampling, Digital signal processing, Pulse (physics), chemistry, business, Beam (structure)
Abstract

In the last few years the FAZIA [1] collaboration has been investigating the properties of silicon detectors – in particular the crystal orientation and resistivity non-uniformity – in order to better pin down the detector characteristics that influence their performances for particle identification using Δ E − E and Pulse Shape Analysis (PSA) techniques. In this paper we present the first particle identification results obtained with detectors selected for good resistivity uniformity and using a “non-channeled” configuration. A new digital electronics was also designed for the R&D phase of FAZIA and was tested under beam for the first time. A quantitative procedure to measure the observed performances is applied in order to quantify the particle identification thresholds. Particle identification thresholds of ∼ 2.5 AMeV for Z ∼ 3 – 10 have been reached with the studied reaction.

Published
2011
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results