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Featured researches published by Pavel Bem.


Radiation Protection Dosimetry | 2018

NEUTRON FIELD MEASUREMENT OF P(35)+Be SOURCE USING THE MULTI-FOIL ACTIVATION METHOD

Milan Štefánik; Pavel Bem; M. Majerle; Jan Novák; Eva Simeckova; Jan Stursa

Neutron field from the p+Be interaction was investigated at the NPI CAS for a proton beam energy of 35 MeV and thick beryllium target. Broad neutron spectra at close source-to-sample distances were determined using the multi-foil activation technique. Two large sets of dosimetry foils containing the Ni, Co, Au, In, Ti, Al, Y, Lu, Nb and Fe were irradiated at a distance of 74 mm at direct neutron beam axis and at a distance of 34 mm from beam axis. Supporting Monte-Carlo MCNPX calculations of the irradiation system were performed as well. From measured reaction rates, the neutron energy spectra at both positions were reconstructed employing the modified version of the SAND-II unfolding code and activation cross-section data from the EAF-2010 library. At the position of irradiated samples, the total fast neutron flux reaches the value up to 1010 cm-2 s-1, and the neutron field is utilizable for radiation hardness study and integral benchmark experiments within the International Fusion Material Irradiation Facility (IFMIF) program.


Radiation Protection Dosimetry | 2018

CROSS SECTIONS MEASURED BY QUASI-MONOENERGETIC NEUTRONS

M. Majerle; Martin Ansorge; Pavel Bem; Jan Novák; Eva Simeckova; Milan Štefánik

197Au, 209Bi, 59Co, natFe and 169Tm samples were irradiated several times with quasi-monoenergetic neutrons from the p+7Li reaction in the energy range of 18-34 MeV. The activities of the samples were measured with the HPGe detector and the reaction rates were calculated. The cross sections were extracted using the SAND-II code with the reference cross sections from the IRDFF database.


international scientific conference on electric power engineering | 2014

Accelerator driven p(37)-D 2 O fast neutron source at NPI Řeř

Milan Štefánik; Pavel Bem; Miloslav Gotz; M. Honusek; M. Majerle; Jan Novák; Eva Simeckova; Frantisek Vesely; Karel Katovsky

In the article, the fundamental information on the neutron production in the D(p,n)2p reaction is summarized, and the measurements at research facilities dealing with such types of source are described. The details about the experimental study of p + D2 and p + D2O reactions and corresponding neutron source development at the NPI in Řež are provided. The accelerator driven fast neutron generator NG-2 based on p(37) + D2O source reaction with a broad neutron spectrum up to 34 MeV is characterized, and the neutron field determined by the multi-foil activation technique validated against the Monte Carlo MCNPX calculations is presented. The research programs realized in this neutron field, commonly used for experimental simulation of the IFMIF (International Fusion Material Irradiation Facility) spectrum, are outlined.


Nuclear Data Sheets | 2014

Neutron Spectrum Determination of the p(35 MeV)-Be Source Reaction by the Dosimetry Foils Method

Milan Štefánik; Pavel Bem; Miloslav Gotz; K. Katovský; M. Majerle; Jan Novák; Eva Simeckova


Physical Review C | 2013

Low-energy deuteron-induced reactions on93Nb

M. Avrigeanu; V. Avrigeanu; Pavel Bem; U. Fischer; M. Honusek; A. J. Koning; J. Mrázek; Eva Simeckova; M. Štefánik; Lukas Zavorka


Radiation Physics and Chemistry | 2014

High-flux white neutron source based on p(35)-Be reactions for activation experiments at NPI

Milan Štefánik; Pavel Bem; Miloslav Gotz; Karel Katovsky; M. Majerle; Jan Novák; Eva Simeckova


Physical Review C | 2014

Low energy deuteron-induced reactions on Fe isotopes

M. Avrigeanu; V. Avrigeanu; Pavel Bem; U. Fischer; M. Honusek; Karel Katovsky; C. Mănăilescu; J. Mrázek; Eva Simeckova; Lukas Zavorka


Radiation Physics and Chemistry | 2017

Neutron spectrum determination of d(20)+Be source reaction by the dosimetry foils method

Milan Štefánik; Pavel Bem; M. Majerle; Jan Novák; Eva Simeckova


EPJ Web of Conferences | 2017

Neutron field of accelerator-driven p(35 MeV)+Be fast neutron source at NPI Rez

Milan Štefánik; Pavel Bem; M. Majerle; Jan Novák; Eva Simeckova


Radiation Physics and Chemistry | 2018

Neutron field study of p(35) + Be source reaction at the NPI Rez

Milan Štefánik; Pavel Bem; M. Majerle; Jan Novák; Eva Simeckova; Jan Stursa

Collaboration


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Eva Simeckova

Academy of Sciences of the Czech Republic

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Milan Štefánik

Czech Technical University in Prague

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Jan Novák

Academy of Sciences of the Czech Republic

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M. Majerle

Academy of Sciences of the Czech Republic

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Karel Katovsky

Brno University of Technology

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Miloslav Gotz

Academy of Sciences of the Czech Republic

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M. Honusek

Academy of Sciences of the Czech Republic

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Lukas Zavorka

Joint Institute for Nuclear Research

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Frantisek Vesely

Academy of Sciences of the Czech Republic

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J. Mrázek

Academy of Sciences of the Czech Republic

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