Marcin Bielewicz - Academia.edu (original) (raw)

Papers by Marcin Bielewicz

Research paper thumbnail of Practical Implementation of an Analogue and Digital Electronics System for a Modular Cosmic Ray Detector—MCORD

Electronics

A Modular COsmic Ray Detector (MCORD) was prepared for use in various physics experiments. MCORD ... more A Modular COsmic Ray Detector (MCORD) was prepared for use in various physics experiments. MCORD detectors can be used in laboratory measurements or can become a part of large measurement sets. MCORD can be used as a muon detector, a veto system, or a tool supporting the testing and calibration of other detectors. MCORD can also work as a stand-alone device for scientific and commercial purposes. The basic element of MCORD is one section consisting of eight oblong scintillators with a double-sided light reading performed by silicon photomultipliers (SiPMs). This work presents a practical description of testing, calibration, and programming of analogue and digital electronics modules. The characterisation and calibration methods of the analogue front-end electronic modules, the obtained results, and their implementation into an operating system are presented. In addition, we describe the development environment and the procedures used to prepare our kit for practical use. The archite...

Research paper thumbnail of Observation of Large Scale Precursor Correlations between Cosmic Rays and Earthquakes with a Periodicity Similar to the Solar Cycle

SSRN Electronic Journal

The search for correlations between secondary cosmic ray detection rates and seismic effects has ... more The search for correlations between secondary cosmic ray detection rates and seismic effects has long been a subject of investigation motivated by the hope of identifying a new precursor type that could feed a global early warning system against earthquakes. Here we show for the first time that the average variation of the cosmic ray detection rates correlates with the global seismic activity to be observed with a time lag of approximately two weeks, and that the significance of the effect varies with a periodicity resembling the undecenal solar cycle, with a shift in phase of around three years, exceeding 6 at local maxima. The precursor characteristics of the observed correlations point to a pioneer perspective of an early warning system against earthquakes. One-Sentence Summary: Variations of secondary cosmic ray detection rates are periodically correlated with future global earthquake magnitude sum.

Research paper thumbnail of Electronic readout system designed for MCORD in NICA experiment

Multi-Purpose Detector (MPD) system is a part of new accelerator complex (Nuclotron-based Ion Col... more Multi-Purpose Detector (MPD) system is a part of new accelerator complex (Nuclotron-based Ion Collider fAcility - NICA) located in Dubna, Russia. MPD to meet all functionalities and requirements needs designed another trigger system. That trigger system has two main task: first, responsibility for off-beam calibration of MPD subdetectors and second, identification and rejection of cosmic ray particles. Additionally, the system can be also used to observe cosmic showers initiated by high energy primary particles. To define in details requirements of the MPD Cosmic Ray Detector (MCORD), the consortium NICA-PL has been formed. In the consortium participate many polish scientific institutions. This paper presents an electronic readout system for the MCORD project. It briefly describes the data path of the signals and all signal processing subsystems: scintillators equipped with SiPM (Silicon Photo Multipliers) detector, AnalogFront End (AFE), HUB, and MTCA processing system.

Research paper thumbnail of Np-237 transmutation efficiency dependence on beam particle, energy and sample position in QUINTA setup

EPJ Web of Conferences, 2019

Np-237 samples were irradiated with spallation neutrons produced at the ADS setup QUINTA. Six exp... more Np-237 samples were irradiated with spallation neutrons produced at the ADS setup QUINTA. Six experiments were carried out at the JINR, in Dubna – one in carbon (C6+), three in deuteron, and two in proton beams. The energy in carbon was 24 GeV, in deuteron – 2, 4 and 8 GeV, respectively, and 660 MeV in the proton beam. In five cases the sample was located in a side window in a lead shield. In one case (660 MeV proton beam) two samples were located on the top of the QUINTA setup, one – on the top of section 2, and the second one – on the top of section 4. The transmutation study method was based on gamma-ray spectrometry. During the analysis of the spectra several fission products and one actinide were identified. Fission product activities yielded the number of fissions. The actinide (Np-238), a result of neutron capture by Np-237, yielded the number of captures. The main goal of this work was to find out if and how the transmutation rate depended on the accelerator beam and sample ...

Research paper thumbnail of Impact of average neutron energy on the fast neutron fluency measurement by Np237 fission to capture ratio and reverse dark current of planar silicon detector methods

EPJ Web of Conferences, 2019

This work is a subsequent step to study the feasibility of fast neutron fluency measurements usin... more This work is a subsequent step to study the feasibility of fast neutron fluency measurements using two different complementary methods. Np-237 samples and planar silicon detectors were mounted very close to each other on different sections of a subcritical assembly irradiated with the proton beam of 0,66 GeV (the Quinta assembly at the Joint Institute for Nuclear Research, Dubna, Russia) to provide both samples with the same neutron fluency. We have processed the experimental data of irradiated Np-237 actinide samples and silicon detectors directly placed on two sections of the QUINTA setup without a lead shield-reflector. Applying the try and error method we have found found that the neutron energy for which the ratio of the fission cross section to the capture cross section of the actinide Np-237 from the nuclear data base is equal to the measured ratio of the fissioned and captured actinide isotopes. The retrieved distinct fission and capture cross sections for the distinct neutr...

Research paper thumbnail of Measurements of cross sections for high energy neutron induced reactions on Co and Bi

EPJ Web of Conferences, 2020

There are few experimental data for neutron cross-section libraries in (n,xn) reactions for vario... more There are few experimental data for neutron cross-section libraries in (n,xn) reactions for various materials at energies above 20 MeV. For neutron energies above 20 MeV, these set of (n,xn) reactions are important for neutron fluence monitoring and spectra unfolding for future generation IV nuclear reactors. There were attempts to measure the cross-sections on natural cobalt and bismuth at incident neutron energies of about 90 MeV and 140 MeV. These measurements were made using the quasi-monoenergetic neutron facility at iThemba LABS, South Africa. In addition, at The Svedberg Laboratory facility in Sweden, similar experiments were performed on natural Yttrium. The measured cross-sections were compared with some of the few available data for neutron-induced reactions at high energies. Data collected from these two facilities, required corrections to be made for the contribution of the low energy tail (continuum) in the incident neutron spectrum. Preliminary results from iThemba LAB...

Research paper thumbnail of MCORD: MPD cosmic ray detector for NICA

Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2018, 2018

Multi-Purpose Detector (MPD) is a part of Nuclotron-based Ion Collider fAcility (NICA) located in... more Multi-Purpose Detector (MPD) is a part of Nuclotron-based Ion Collider fAcility (NICA) located in Dubna, Russia. For full functionality, the MPD needs an additional trigger system for off-beam calibration of MPD subdetectors and for rejection of cosmic ray particles (mainly muons). The system could also be useful for astrophysics observations of cosmic showers initiated by high energy primary particles. The consortium NICA-PL comprised of several Polish scientific institutions has been formed to define goals and basic assumptions for MPD Cosmic Ray Detector (MCORD). This article describes the early stage design of the MCORD detector based on plastic scintillators with silicon photomultiplier photodetectors for scintillation readout and electronic system based on MicroTCA crate. Plans for simulations of MCORD detector performance are also presented.

Research paper thumbnail of Measurements of Np-237 incineration in ADS setup QUINTA

Proceedings of XXII International Baldin Seminar on High Energy Physics Problems — PoS(Baldin ISHEPP XXII), Feb 23, 2015

Research paper thumbnail of The cosmic ray detector for the NICA collider

Multi-Purpose Detector (MPD) is a main part of a new Ion Collider fAcility (NICA) located in Dubn... more Multi-Purpose Detector (MPD) is a main part of a new Ion Collider fAcility (NICA) located in Dubna, Russia. To increase MPD functionality, it was proposed to add an additional muon trigger system for off-beam calibration of the MPD sub-detectors and for rejection of cosmic ray background during experiments. The system could also be very useful for astrophysical observations of cosmic showers initiated by high energy primary particles. This article describes the main goals of MCORD detector and the early stage of MCORD design, based on plastic scintillators with silicon photomultiplier photodetectors (SiPM) for scintillation readout and electronic system based on MicroTCA standard.

Research paper thumbnail of P oS(Baldin ISHEPP XXII)056 Measurements of Np-237 incineration in ADS setup

Np-237 samples were irradiated in spallation neutrons produced in ADS setup QUINTA. Three experim... more Np-237 samples were irradiated in spallation neutrons produced in ADS setup QUINTA. Three experiments were carried out. The accelerated beam consisted of deuteron ions of energy 2, 4 and 8 GeV respectively. The method was based on gamma-ray spectrometry measurement. During analysis of the spectra several fission products and one actinide were identified. Fission product activities gave the number of fissions. The actinide (Np-238), a result of neutron capture by Np-237 gave the number of captures.

Research paper thumbnail of P oS(Baldin ISHEPP XXII)060

Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercia... more Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

Research paper thumbnail of Radiation monitoring of the slow control electronic equipment of the NICA-MPD detector

Research paper thumbnail of Measurements of High Energy Neutron Spectrum (> 10 MeV) by Using Yttrium Foils in a U/Pb Assembly

Nuclear Data Sheets, 2014

ABSTRACT Study of deep subcritical electronuclear systems and radioactive waste transmutation usi... more ABSTRACT Study of deep subcritical electronuclear systems and radioactive waste transmutation using relativistic beams were performed. This work is a preliminary step toward the study of the physical properties of Accelerator Driven Systems, in which a deeply subcritical active core is irradiated by a pulsed beam of relativistic ions. The long-range goal of the project is to study the capabilities of such systems with a hard neutron spectrum, for transmutation of radioactive nuclear wastes. Two experimental assemblies, “Energy plus Transmutation” (2006-2009) and “Quinta” (2011-), were irradiated by 1 to 6 GeV deuteron beams using the JINR NUCLOTRON accelerator. The main difference between the two experimental setups is the spallation target - lead or natural uranium. We attempt to obtain neutron energy spectra inside the volume of these assemblies using threshold reactions in natural yttrium (89Y) foils. Some results from three different experiments are presented.

Research paper thumbnail of Measurement of Cross-sections of Yttrium (n,xn) Threshold Reactions by Means of Gamma Spectroscopy

Physics Procedia, 2014

Neutron activation and gamma spectrometry are usable also for the determination of cross-sections... more Neutron activation and gamma spectrometry are usable also for the determination of cross-sections of different neutron reactions. We have studied the cross-section of yttrium (n,xn) threshold reactions using quasi mono-energetic neutron source based on the reaction on 7 Li target at Nuclear Physics Institute of ASCR in Rez. Yttrium (n,xn) threshold reactions are suitable candidates for fast neutron field measurement by activation detectors. Fast neutron field monitoring is necessary already today at a wide range of accelerator facilities and will gain on importance in future fast reactors of generation IV, accelerator transmutation systems or fusion reactors. The knowledge of the cross-sections is crucial for such purpose. Unfortunately, the cross-section is sufficiently known only for 89 Y(n,2n) 88 Y reaction. For higher orders of reactions there are almost no experimental data. Special attention was paid to the 89 Y(n,3n) 87 Y reaction. The nuclei are produced, both in the ground state with half-life 79.8 hours and in the isomeric state with half-life 13.38 hours. The isomer decays mainly through the gamma transition to the ground state, the beta decay of the excited state is negligible within our accuracy. The cross-sections of both 87 Y productions were analyzed.

Research paper thumbnail of Poland as a Euro-Atlantic Power: The Determinants of U.S.-Polish Relations 1989-2005

: The present study treats the evolution of Polish-American security relations since 1989 with sp... more : The present study treats the evolution of Polish-American security relations since 1989 with special focus on the diplomatic events since 11 September 2001. The study poses the question as to what forces personalities and events led to the rise of Poland as a power in the transformed Europe of the 21st century particularly as this phenomenon has been visible in US-Polish alliance statecraft. The newly democratic Poland eager to avoid the fate as in the years from the end of the 18th century until 1945 sought a durable security bond with the United States via Euro-Atlantic structures as well as integration into what became the European Union. Polish diplomatic and political elites hoped that a formal alliance with the United States would eliminate the vulnerabilities and risks of the first half of the 20th century. The new turmoil of the 21st century however poses a great question mark over such statecraft as was evident in the events of diplomacy and alliance cohesion as developed...

Research paper thumbnail of E 13-2018-37

Research paper thumbnail of The prototype dosimetry system to protect MPD electronic equipment at the new NICA collider

The Multi-Purpose Detector (MPD) is a main detection system of the new collider located in Dubna,... more The Multi-Purpose Detector (MPD) is a main detection system of the new collider located in Dubna, Russia (Nuclotron-based Ion Collider fAcility -NICA). During the work, the Slow Control electronic equipment which is located on the MPD surface and on the special platform near the MPD body, an accidental irradiation caused by the NICA’s failure or its abnormal functioning may occur. Thus, there is a risk of destroying the electronics by a radiation exposure in the platform area, and in the consequence the emergency/fast switch off of the MPD sub-detectors might become impossible. We present the preliminary dosimetry system i.e. the method of prevention of such situation by the continuous monitoring on the Slow Control electronics on the platform. System will be alarming when the radiation levels threshold will be surpassed.

Research paper thumbnail of Conceptual design report of the MPD Cosmic Ray Detector (MCORD)

Journal of Instrumentation

This report presents a concept of constructing a detector dedicated for detection of muons observ... more This report presents a concept of constructing a detector dedicated for detection of muons observed during measurements carried out at the MPD (Multi-Purpose Detector) detector that is currently under construction at the NICA facility, Russia, Dubna. It has been proposed to design and build an additional detector that will complement the current MPD set and increase its measurement capabilities. The main goal of this project is to provide information from cosmic muons that pass the MPD detector in both in-beam and off-beam experiments. Hence, the detector is called the MPD COsmic Ray Detector (MCORD).The conceptual design of MCORD is proposed by a Polish consortium NICA-PL comprising several Polish scientific institutions. The data from cosmic ray muons could be used as a trigger for calibration of other detection systems comprising the MPD detector. Large surface covered by the MCORD offers also possibility for efficient registration of muons generated in expanding atmospheric show...

Research paper thumbnail of Measurements of fast neutron spectrum in QUINTA assembly irradiated with 2, 4 and 8 GeV deuterons

Proceedings of XXII International Baldin Seminar on High Energy Physics Problems — PoS(Baldin ISHEPP XXII)

Research paper thumbnail of Lead shielding impact on fast neutron spectrum (>10MeV) in QUINTA uranium target

Proceedings of XXII International Baldin Seminar on High Energy Physics Problems — PoS(Baldin ISHEPP XXII)

Lead shielding impact on fast neutron spectrum (> 10 MeV) in QUINTA uranium target M. Szuta PoS(B... more Lead shielding impact on fast neutron spectrum (> 10 MeV) in QUINTA uranium target M. Szuta PoS(Baldin ISHEPP XXII)060 Lead shielding impact on fast neutron spectrum (> 10 MeV) in QUINTA uranium target M. Szuta

Research paper thumbnail of Practical Implementation of an Analogue and Digital Electronics System for a Modular Cosmic Ray Detector—MCORD

Electronics

A Modular COsmic Ray Detector (MCORD) was prepared for use in various physics experiments. MCORD ... more A Modular COsmic Ray Detector (MCORD) was prepared for use in various physics experiments. MCORD detectors can be used in laboratory measurements or can become a part of large measurement sets. MCORD can be used as a muon detector, a veto system, or a tool supporting the testing and calibration of other detectors. MCORD can also work as a stand-alone device for scientific and commercial purposes. The basic element of MCORD is one section consisting of eight oblong scintillators with a double-sided light reading performed by silicon photomultipliers (SiPMs). This work presents a practical description of testing, calibration, and programming of analogue and digital electronics modules. The characterisation and calibration methods of the analogue front-end electronic modules, the obtained results, and their implementation into an operating system are presented. In addition, we describe the development environment and the procedures used to prepare our kit for practical use. The archite...

Research paper thumbnail of Observation of Large Scale Precursor Correlations between Cosmic Rays and Earthquakes with a Periodicity Similar to the Solar Cycle

SSRN Electronic Journal

The search for correlations between secondary cosmic ray detection rates and seismic effects has ... more The search for correlations between secondary cosmic ray detection rates and seismic effects has long been a subject of investigation motivated by the hope of identifying a new precursor type that could feed a global early warning system against earthquakes. Here we show for the first time that the average variation of the cosmic ray detection rates correlates with the global seismic activity to be observed with a time lag of approximately two weeks, and that the significance of the effect varies with a periodicity resembling the undecenal solar cycle, with a shift in phase of around three years, exceeding 6 at local maxima. The precursor characteristics of the observed correlations point to a pioneer perspective of an early warning system against earthquakes. One-Sentence Summary: Variations of secondary cosmic ray detection rates are periodically correlated with future global earthquake magnitude sum.

Research paper thumbnail of Electronic readout system designed for MCORD in NICA experiment

Multi-Purpose Detector (MPD) system is a part of new accelerator complex (Nuclotron-based Ion Col... more Multi-Purpose Detector (MPD) system is a part of new accelerator complex (Nuclotron-based Ion Collider fAcility - NICA) located in Dubna, Russia. MPD to meet all functionalities and requirements needs designed another trigger system. That trigger system has two main task: first, responsibility for off-beam calibration of MPD subdetectors and second, identification and rejection of cosmic ray particles. Additionally, the system can be also used to observe cosmic showers initiated by high energy primary particles. To define in details requirements of the MPD Cosmic Ray Detector (MCORD), the consortium NICA-PL has been formed. In the consortium participate many polish scientific institutions. This paper presents an electronic readout system for the MCORD project. It briefly describes the data path of the signals and all signal processing subsystems: scintillators equipped with SiPM (Silicon Photo Multipliers) detector, AnalogFront End (AFE), HUB, and MTCA processing system.

Research paper thumbnail of Np-237 transmutation efficiency dependence on beam particle, energy and sample position in QUINTA setup

EPJ Web of Conferences, 2019

Np-237 samples were irradiated with spallation neutrons produced at the ADS setup QUINTA. Six exp... more Np-237 samples were irradiated with spallation neutrons produced at the ADS setup QUINTA. Six experiments were carried out at the JINR, in Dubna – one in carbon (C6+), three in deuteron, and two in proton beams. The energy in carbon was 24 GeV, in deuteron – 2, 4 and 8 GeV, respectively, and 660 MeV in the proton beam. In five cases the sample was located in a side window in a lead shield. In one case (660 MeV proton beam) two samples were located on the top of the QUINTA setup, one – on the top of section 2, and the second one – on the top of section 4. The transmutation study method was based on gamma-ray spectrometry. During the analysis of the spectra several fission products and one actinide were identified. Fission product activities yielded the number of fissions. The actinide (Np-238), a result of neutron capture by Np-237, yielded the number of captures. The main goal of this work was to find out if and how the transmutation rate depended on the accelerator beam and sample ...

Research paper thumbnail of Impact of average neutron energy on the fast neutron fluency measurement by Np237 fission to capture ratio and reverse dark current of planar silicon detector methods

EPJ Web of Conferences, 2019

This work is a subsequent step to study the feasibility of fast neutron fluency measurements usin... more This work is a subsequent step to study the feasibility of fast neutron fluency measurements using two different complementary methods. Np-237 samples and planar silicon detectors were mounted very close to each other on different sections of a subcritical assembly irradiated with the proton beam of 0,66 GeV (the Quinta assembly at the Joint Institute for Nuclear Research, Dubna, Russia) to provide both samples with the same neutron fluency. We have processed the experimental data of irradiated Np-237 actinide samples and silicon detectors directly placed on two sections of the QUINTA setup without a lead shield-reflector. Applying the try and error method we have found found that the neutron energy for which the ratio of the fission cross section to the capture cross section of the actinide Np-237 from the nuclear data base is equal to the measured ratio of the fissioned and captured actinide isotopes. The retrieved distinct fission and capture cross sections for the distinct neutr...

Research paper thumbnail of Measurements of cross sections for high energy neutron induced reactions on Co and Bi

EPJ Web of Conferences, 2020

There are few experimental data for neutron cross-section libraries in (n,xn) reactions for vario... more There are few experimental data for neutron cross-section libraries in (n,xn) reactions for various materials at energies above 20 MeV. For neutron energies above 20 MeV, these set of (n,xn) reactions are important for neutron fluence monitoring and spectra unfolding for future generation IV nuclear reactors. There were attempts to measure the cross-sections on natural cobalt and bismuth at incident neutron energies of about 90 MeV and 140 MeV. These measurements were made using the quasi-monoenergetic neutron facility at iThemba LABS, South Africa. In addition, at The Svedberg Laboratory facility in Sweden, similar experiments were performed on natural Yttrium. The measured cross-sections were compared with some of the few available data for neutron-induced reactions at high energies. Data collected from these two facilities, required corrections to be made for the contribution of the low energy tail (continuum) in the incident neutron spectrum. Preliminary results from iThemba LAB...

Research paper thumbnail of MCORD: MPD cosmic ray detector for NICA

Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2018, 2018

Multi-Purpose Detector (MPD) is a part of Nuclotron-based Ion Collider fAcility (NICA) located in... more Multi-Purpose Detector (MPD) is a part of Nuclotron-based Ion Collider fAcility (NICA) located in Dubna, Russia. For full functionality, the MPD needs an additional trigger system for off-beam calibration of MPD subdetectors and for rejection of cosmic ray particles (mainly muons). The system could also be useful for astrophysics observations of cosmic showers initiated by high energy primary particles. The consortium NICA-PL comprised of several Polish scientific institutions has been formed to define goals and basic assumptions for MPD Cosmic Ray Detector (MCORD). This article describes the early stage design of the MCORD detector based on plastic scintillators with silicon photomultiplier photodetectors for scintillation readout and electronic system based on MicroTCA crate. Plans for simulations of MCORD detector performance are also presented.

Research paper thumbnail of Measurements of Np-237 incineration in ADS setup QUINTA

Proceedings of XXII International Baldin Seminar on High Energy Physics Problems — PoS(Baldin ISHEPP XXII), Feb 23, 2015

Research paper thumbnail of The cosmic ray detector for the NICA collider

Multi-Purpose Detector (MPD) is a main part of a new Ion Collider fAcility (NICA) located in Dubn... more Multi-Purpose Detector (MPD) is a main part of a new Ion Collider fAcility (NICA) located in Dubna, Russia. To increase MPD functionality, it was proposed to add an additional muon trigger system for off-beam calibration of the MPD sub-detectors and for rejection of cosmic ray background during experiments. The system could also be very useful for astrophysical observations of cosmic showers initiated by high energy primary particles. This article describes the main goals of MCORD detector and the early stage of MCORD design, based on plastic scintillators with silicon photomultiplier photodetectors (SiPM) for scintillation readout and electronic system based on MicroTCA standard.

Research paper thumbnail of P oS(Baldin ISHEPP XXII)056 Measurements of Np-237 incineration in ADS setup

Np-237 samples were irradiated in spallation neutrons produced in ADS setup QUINTA. Three experim... more Np-237 samples were irradiated in spallation neutrons produced in ADS setup QUINTA. Three experiments were carried out. The accelerated beam consisted of deuteron ions of energy 2, 4 and 8 GeV respectively. The method was based on gamma-ray spectrometry measurement. During analysis of the spectra several fission products and one actinide were identified. Fission product activities gave the number of fissions. The actinide (Np-238), a result of neutron capture by Np-237 gave the number of captures.

Research paper thumbnail of P oS(Baldin ISHEPP XXII)060

Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercia... more Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

Research paper thumbnail of Radiation monitoring of the slow control electronic equipment of the NICA-MPD detector

Research paper thumbnail of Measurements of High Energy Neutron Spectrum (> 10 MeV) by Using Yttrium Foils in a U/Pb Assembly

Nuclear Data Sheets, 2014

ABSTRACT Study of deep subcritical electronuclear systems and radioactive waste transmutation usi... more ABSTRACT Study of deep subcritical electronuclear systems and radioactive waste transmutation using relativistic beams were performed. This work is a preliminary step toward the study of the physical properties of Accelerator Driven Systems, in which a deeply subcritical active core is irradiated by a pulsed beam of relativistic ions. The long-range goal of the project is to study the capabilities of such systems with a hard neutron spectrum, for transmutation of radioactive nuclear wastes. Two experimental assemblies, “Energy plus Transmutation” (2006-2009) and “Quinta” (2011-), were irradiated by 1 to 6 GeV deuteron beams using the JINR NUCLOTRON accelerator. The main difference between the two experimental setups is the spallation target - lead or natural uranium. We attempt to obtain neutron energy spectra inside the volume of these assemblies using threshold reactions in natural yttrium (89Y) foils. Some results from three different experiments are presented.

Research paper thumbnail of Measurement of Cross-sections of Yttrium (n,xn) Threshold Reactions by Means of Gamma Spectroscopy

Physics Procedia, 2014

Neutron activation and gamma spectrometry are usable also for the determination of cross-sections... more Neutron activation and gamma spectrometry are usable also for the determination of cross-sections of different neutron reactions. We have studied the cross-section of yttrium (n,xn) threshold reactions using quasi mono-energetic neutron source based on the reaction on 7 Li target at Nuclear Physics Institute of ASCR in Rez. Yttrium (n,xn) threshold reactions are suitable candidates for fast neutron field measurement by activation detectors. Fast neutron field monitoring is necessary already today at a wide range of accelerator facilities and will gain on importance in future fast reactors of generation IV, accelerator transmutation systems or fusion reactors. The knowledge of the cross-sections is crucial for such purpose. Unfortunately, the cross-section is sufficiently known only for 89 Y(n,2n) 88 Y reaction. For higher orders of reactions there are almost no experimental data. Special attention was paid to the 89 Y(n,3n) 87 Y reaction. The nuclei are produced, both in the ground state with half-life 79.8 hours and in the isomeric state with half-life 13.38 hours. The isomer decays mainly through the gamma transition to the ground state, the beta decay of the excited state is negligible within our accuracy. The cross-sections of both 87 Y productions were analyzed.

Research paper thumbnail of Poland as a Euro-Atlantic Power: The Determinants of U.S.-Polish Relations 1989-2005

: The present study treats the evolution of Polish-American security relations since 1989 with sp... more : The present study treats the evolution of Polish-American security relations since 1989 with special focus on the diplomatic events since 11 September 2001. The study poses the question as to what forces personalities and events led to the rise of Poland as a power in the transformed Europe of the 21st century particularly as this phenomenon has been visible in US-Polish alliance statecraft. The newly democratic Poland eager to avoid the fate as in the years from the end of the 18th century until 1945 sought a durable security bond with the United States via Euro-Atlantic structures as well as integration into what became the European Union. Polish diplomatic and political elites hoped that a formal alliance with the United States would eliminate the vulnerabilities and risks of the first half of the 20th century. The new turmoil of the 21st century however poses a great question mark over such statecraft as was evident in the events of diplomacy and alliance cohesion as developed...

Research paper thumbnail of E 13-2018-37

Research paper thumbnail of The prototype dosimetry system to protect MPD electronic equipment at the new NICA collider

The Multi-Purpose Detector (MPD) is a main detection system of the new collider located in Dubna,... more The Multi-Purpose Detector (MPD) is a main detection system of the new collider located in Dubna, Russia (Nuclotron-based Ion Collider fAcility -NICA). During the work, the Slow Control electronic equipment which is located on the MPD surface and on the special platform near the MPD body, an accidental irradiation caused by the NICA’s failure or its abnormal functioning may occur. Thus, there is a risk of destroying the electronics by a radiation exposure in the platform area, and in the consequence the emergency/fast switch off of the MPD sub-detectors might become impossible. We present the preliminary dosimetry system i.e. the method of prevention of such situation by the continuous monitoring on the Slow Control electronics on the platform. System will be alarming when the radiation levels threshold will be surpassed.

Research paper thumbnail of Conceptual design report of the MPD Cosmic Ray Detector (MCORD)

Journal of Instrumentation

This report presents a concept of constructing a detector dedicated for detection of muons observ... more This report presents a concept of constructing a detector dedicated for detection of muons observed during measurements carried out at the MPD (Multi-Purpose Detector) detector that is currently under construction at the NICA facility, Russia, Dubna. It has been proposed to design and build an additional detector that will complement the current MPD set and increase its measurement capabilities. The main goal of this project is to provide information from cosmic muons that pass the MPD detector in both in-beam and off-beam experiments. Hence, the detector is called the MPD COsmic Ray Detector (MCORD).The conceptual design of MCORD is proposed by a Polish consortium NICA-PL comprising several Polish scientific institutions. The data from cosmic ray muons could be used as a trigger for calibration of other detection systems comprising the MPD detector. Large surface covered by the MCORD offers also possibility for efficient registration of muons generated in expanding atmospheric show...

Research paper thumbnail of Measurements of fast neutron spectrum in QUINTA assembly irradiated with 2, 4 and 8 GeV deuterons

Proceedings of XXII International Baldin Seminar on High Energy Physics Problems — PoS(Baldin ISHEPP XXII)

Research paper thumbnail of Lead shielding impact on fast neutron spectrum (>10MeV) in QUINTA uranium target

Proceedings of XXII International Baldin Seminar on High Energy Physics Problems — PoS(Baldin ISHEPP XXII)

Lead shielding impact on fast neutron spectrum (> 10 MeV) in QUINTA uranium target M. Szuta PoS(B... more Lead shielding impact on fast neutron spectrum (> 10 MeV) in QUINTA uranium target M. Szuta PoS(Baldin ISHEPP XXII)060 Lead shielding impact on fast neutron spectrum (> 10 MeV) in QUINTA uranium target M. Szuta