IONEL LAZANU - Academia.edu (original) (raw)

Papers by IONEL LAZANU

Research paper thumbnail of A comparative study of the radiation properties of SiC in respect to silicon and diamond

Silicon carbide represents a class of semiconductors, due to its polytypism. Besides its properti... more Silicon carbide represents a class of semiconductors, due to its polytypism. Besides its properties of interest for semiconductor devices, sometimes better than silicon and diamond, it is supposed to have a good radiation tolerance. In the present work, the bulk degradation of SiC in hadron fields (pions and protons), in the energy range between 100 MeV and 10 GeV has been estimated theoretically: the nuclear stopping power and the concentration of primary defects. The results are compared to the similar ones corresponding to diamond and silicon.

Research paper thumbnail of Some considerations about cosmogenic production of radioactive isotopes in Ar as target for the next neutrino experiments

The concept of the LAr TPC technology that is an excellent tracking calorimeter detector will be ... more The concept of the LAr TPC technology that is an excellent tracking calorimeter detector will be used for the next generations of neutrino experiments. In this class of detectors both the scintillation light emitted and the charge produced by the ionization are used to detect and identify the characteristics of the primary particle. The reduction of the radioactive background, the knowledge of the sources and mechanisms of its production as well as the characteristics of the signals have as consequence the increase of the sensitivity of huge detectors and the capability to discriminate between various particles interacting with the detector. Cosmogenic sources of background or activation of different materials become more important in this context. The radioactivity induced by cosmogenic reactions in Ar is discussed by considering muon capture and reactions induced by neutrons as sources of background. The simulated cross sections for the considered nuclear reactions are obtained us...

Research paper thumbnail of Expression of Interest for a very long baseline neutrino oscillation experiment (LBNO)

This Expression of Interest (EoI) describes the motivation for and the feasibility studies of a l... more This Expression of Interest (EoI) describes the motivation for and the feasibility studies of a long baseline neutrino oscillation experiment (LBNO) with a new conventional neutrino beamline facility (CN2PY). The beam will be aimed at a next generation deep-underground neutrino observatory comprising a double phase liquid argon (LAr) detector and a magnetized iron calorimeter, located at the Pyhasalmi (Finland) mine at a distance of 2300~km. The double phase LAr Large Electron Multiplier Time Projection Chamber (LAr LEM-TPC) is known to provide excellent tracking and calorimetry performance that can outperform other techniques. An initial 20~kton LAr fiducial volume, as considered here, comparable to the fiducial mass of SuperKamiokande and NOvA, offers a new insight and an increase in sensitivity reach for many physics channels. A magnetized iron calorimeter with muon momentum and charge determination collects an independent neutrino sample, and serves as a tail catcher for CERN be...

Research paper thumbnail of Role of Phase and Group Velocities in Cerenkov Radiation and Applications in Hep Experiments

Emission of Cerenkov radiation represents a phenomenon used in detector systems, in a very wide t... more Emission of Cerenkov radiation represents a phenomenon used in detector systems, in a very wide type of applications: high energy physics, nuclear physics, astroparticles, high energy neutrino and gamma-ray astronomy. This phenomenon is supposed to exist in strong interactions and gravity as well. Some peculiarities of the electromagnetic Cherenkov radiation, very important in HEP experiments, are not always completely considered and could conduce to mistaken interpretations. In this paper, the role of phase and group velocities is revised and discussed for media with different dispersive and symmetry properties. The energy distribution of the electric field of the emitted radiation is analysed and the essential role of group velocity is evidenced. For possible practical applications, these characteristics are calculated and essential aspects are analysed for some media where Cerenkov radiation could be produced: water, ice, noble gases (liquids and solids) and alkali.

Research paper thumbnail of Radioactive background for ProtoDUNE detector

The Deep Underground Neutrino Experiment (DUNE) is a leading-edge, international experiment for n... more The Deep Underground Neutrino Experiment (DUNE) is a leading-edge, international experiment for neutrino science and proton decay studies. This experiment is looking for answers regarding several fundamental questions about the nature of matter and the evolution of the universe: origin of matter, unification of forces, physics of black holes. Two far detector prototypes using two distinct technologies have been developed at CERN. The prototypes are testing and validating the liquid argon time projection chamber technology (LArTPC). In neutrino physics, as well as in any experiment with rare interaction rate, the good knowledge of the radioactive backgrounds is important to the success of the study. Muons and neutrons represent the main sources of background for this kind of experiments. In this paper, we have considered two sources of neutrons: cosmic neutrons and neutrons coming from the accelerating tunnel. Also, cosmic muons are taken into account. The contribution of these parti...

Research paper thumbnail of Measurement of low energy component of the flux of cosmic rays using nuclear track detectors

The effects induced by muons with very low energies are usually neglected. In fact, they could re... more The effects induced by muons with very low energies are usually neglected. In fact, they could represent a source of radioactive background due to capture processes in different materials, which in most of cases produce radioactive isotopes, and thus they must be taken into account. Plastic track detectors have been used in the present paper to measure the ratio between the vertical and horizontal components of the flux of very low energy terrestrial muons at ground level. The data have been collected during 160 days.

Research paper thumbnail of Can strangelets be detected in a large LAr neutrino detector?

Predicted as possible bound states of up, down and strange quarks, strangelets could be more ener... more Predicted as possible bound states of up, down and strange quarks, strangelets could be more energetically favourable and more stable than nuclear matter. In this paper we explore the possibility of detecting such particles with the future large liquid argon detectors developed for neutrino physics. Using signals from ionization and scintillations we suggest that a calorimetric TCP detector is able to put in evidence and to discriminate between light strangelets at intermediate energy. Corresponding author. ar X iv :2 10 7. 05 25 7v 1 [ ph ys ic s. in sde t] 1 2 Ju l 2 02 1

Research paper thumbnail of Muon induced radioactivity in the next generation of neutrino experiments

Research paper thumbnail of Short analysis of cosmogenic production of radioactive isotopes in argon as target for the next neutrino experiments

Radiation Physics and Chemistry

Research paper thumbnail of Silicon detectors for the sLHC

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Dec 1, 2011

In current particle physics experiments, silicon strip detectors are widely used as part of the i... more In current particle physics experiments, silicon strip detectors are widely used as part of the inner tracking layers. A foreseeable large-scale application for such detectors consists of the luminosity upgrade of the Large Hadron Collider (LHC), the super-LHC or sLHC, where silicon detectors with extreme radiation hardness are required. The mission statement of the CERN RD50 Collaboration is the development of radiation-hard semiconductor devices for very high luminosity colliders. As a consequence, the aim of the R&D programme ...

Research paper thumbnail of About detecting very low mass black holes in LAr detectors

Journal of Cosmology and Astroparticle Physics

Research paper thumbnail of Lindhard Factors and Concentrations of Primary Defects in Semiconductor Materials for uses in HEP

Research paper thumbnail of Semiconductor detectors for high radiation fields: microscopic processes in materials and the control of device parameters

Journal of Optoelectronics and Advanced Materials, 2009

Research paper thumbnail of Contribution of the electron-phonon coupling to Lindhard partition at low energy in Ge and Si detectors for astroparticle physics

The influence of the transient thermal effects on the partition of the energy of selfrecoils in g... more The influence of the transient thermal effects on the partition of the energy of selfrecoils in germanium and silicon into energy eventually given to electrons and to atomic recoils respectively is studied. The transient effects are treated in the frame of the thermal spike model, which considers the electronic and atomic subsystems coupled through the electron - phonon interaction. For low energies of selfrecoils, we show that the corrections to the energy partition curves due to the energy exchange during the transient processes modify the Lindhard predictions. These effects depend on the initial temperature of the target material, as the energies exchanged between electronic and lattice subsystems have different signs for temperatures lower and higher than about 15 K. Many of the experimental data reported in the literature support the model.

Research paper thumbnail of New aspects of the contribution of primary defects of silicon to long-time degradation of detectors operating in high fields of radiation

Journal of Optoelectronics and Advanced Materials, 2007

Research paper thumbnail of Elementary Remarks About the Time, Mass and Relativistic Dynamics of Quantum Systems

One of the most profound and difficult problems of physics in the last century is the constructio... more One of the most profound and difficult problems of physics in the last century is the construction of a simple theory which unites the ideas of quantum mechanics and relativity. The concepts which are used in quantum mechanics related to the measurements of positions, momenta, energy and time, are the same concepts in terms of which the special relativistic postulates are formulated. Hence, it is at least possible to formulate the requirement of special relativistic invariance for quantum theories and to ascertain whether these requirements are satisfied. The fact that the answer is nearer to no than to yes, that quantum mechanics has not yet been fully adjusted to the postulates of the special theory, is perhaps irritating. In the general theory of relativity, the situation is different: the space-time coordinates are only auxiliary quantities to which arbitrary values for every event could be given. Hence, the measurement of position, that is, of the space coordin ates, is certainly not a significant measurement if the postulates of the general theory are adopted: any arbitrary value can be given to the coordinates. The same holds for momenta. The purpose of this brief paper is to make in principle some personal and particular remarks on the fundamental concepts of time and mass. Some comments about the consequences on the relativistic dynamics of quantum systems are also formulated.

Research paper thumbnail of The Wave Packet Formalism of Neutrino Oscillations and the Maximal Mixing Scenario

Some aspects of the neutrino o scillation phenomena a re studied in this contribution in the fram... more Some aspects of the neutrino o scillation phenomena a re studied in this contribution in the framework of quantum mechanics wave packet formalism. Based on the experimental arguments we consider the implications of the threefold maximal mixing scenarios in this formalism. Some possible predicted consequences are discussed.

Research paper thumbnail of Mass predictions for baryons

Research paper thumbnail of Silicon detectors operating beyond LHC conditions: scenarios for radiation fields and detector degradation

Research paper thumbnail of Re-Analysis of Some Bubble Chamber Data on NN Annihilation 1

A re-analysis of some pp and pn data, at rest and in flight, obtained in bub- ble chamber experim... more A re-analysis of some pp and pn data, at rest and in flight, obtained in bub- ble chamber experiments, is presented. The (�+�−) and (KSKS) final states for the channels (2�−�+) and (KSKS�) are investigated. Evidence for a narrow meson resonance structure, cautiously suggested as f0(1500), is given. In the (�+�−) invari- ant mass distribution from pn annihilations in flight, using the method of difference spectra, a very clear evidence for �0, f2(1270) and f0(1500) is first time obtained from these data. This re-analysis suggests that the old bubble chamber data can still provide relevant information on the annihilation process in liquid hydrogen and deuterium, and can elucidate controversial aspects of the annihilation mechanism.

Research paper thumbnail of A comparative study of the radiation properties of SiC in respect to silicon and diamond

Silicon carbide represents a class of semiconductors, due to its polytypism. Besides its properti... more Silicon carbide represents a class of semiconductors, due to its polytypism. Besides its properties of interest for semiconductor devices, sometimes better than silicon and diamond, it is supposed to have a good radiation tolerance. In the present work, the bulk degradation of SiC in hadron fields (pions and protons), in the energy range between 100 MeV and 10 GeV has been estimated theoretically: the nuclear stopping power and the concentration of primary defects. The results are compared to the similar ones corresponding to diamond and silicon.

Research paper thumbnail of Some considerations about cosmogenic production of radioactive isotopes in Ar as target for the next neutrino experiments

The concept of the LAr TPC technology that is an excellent tracking calorimeter detector will be ... more The concept of the LAr TPC technology that is an excellent tracking calorimeter detector will be used for the next generations of neutrino experiments. In this class of detectors both the scintillation light emitted and the charge produced by the ionization are used to detect and identify the characteristics of the primary particle. The reduction of the radioactive background, the knowledge of the sources and mechanisms of its production as well as the characteristics of the signals have as consequence the increase of the sensitivity of huge detectors and the capability to discriminate between various particles interacting with the detector. Cosmogenic sources of background or activation of different materials become more important in this context. The radioactivity induced by cosmogenic reactions in Ar is discussed by considering muon capture and reactions induced by neutrons as sources of background. The simulated cross sections for the considered nuclear reactions are obtained us...

Research paper thumbnail of Expression of Interest for a very long baseline neutrino oscillation experiment (LBNO)

This Expression of Interest (EoI) describes the motivation for and the feasibility studies of a l... more This Expression of Interest (EoI) describes the motivation for and the feasibility studies of a long baseline neutrino oscillation experiment (LBNO) with a new conventional neutrino beamline facility (CN2PY). The beam will be aimed at a next generation deep-underground neutrino observatory comprising a double phase liquid argon (LAr) detector and a magnetized iron calorimeter, located at the Pyhasalmi (Finland) mine at a distance of 2300~km. The double phase LAr Large Electron Multiplier Time Projection Chamber (LAr LEM-TPC) is known to provide excellent tracking and calorimetry performance that can outperform other techniques. An initial 20~kton LAr fiducial volume, as considered here, comparable to the fiducial mass of SuperKamiokande and NOvA, offers a new insight and an increase in sensitivity reach for many physics channels. A magnetized iron calorimeter with muon momentum and charge determination collects an independent neutrino sample, and serves as a tail catcher for CERN be...

Research paper thumbnail of Role of Phase and Group Velocities in Cerenkov Radiation and Applications in Hep Experiments

Emission of Cerenkov radiation represents a phenomenon used in detector systems, in a very wide t... more Emission of Cerenkov radiation represents a phenomenon used in detector systems, in a very wide type of applications: high energy physics, nuclear physics, astroparticles, high energy neutrino and gamma-ray astronomy. This phenomenon is supposed to exist in strong interactions and gravity as well. Some peculiarities of the electromagnetic Cherenkov radiation, very important in HEP experiments, are not always completely considered and could conduce to mistaken interpretations. In this paper, the role of phase and group velocities is revised and discussed for media with different dispersive and symmetry properties. The energy distribution of the electric field of the emitted radiation is analysed and the essential role of group velocity is evidenced. For possible practical applications, these characteristics are calculated and essential aspects are analysed for some media where Cerenkov radiation could be produced: water, ice, noble gases (liquids and solids) and alkali.

Research paper thumbnail of Radioactive background for ProtoDUNE detector

The Deep Underground Neutrino Experiment (DUNE) is a leading-edge, international experiment for n... more The Deep Underground Neutrino Experiment (DUNE) is a leading-edge, international experiment for neutrino science and proton decay studies. This experiment is looking for answers regarding several fundamental questions about the nature of matter and the evolution of the universe: origin of matter, unification of forces, physics of black holes. Two far detector prototypes using two distinct technologies have been developed at CERN. The prototypes are testing and validating the liquid argon time projection chamber technology (LArTPC). In neutrino physics, as well as in any experiment with rare interaction rate, the good knowledge of the radioactive backgrounds is important to the success of the study. Muons and neutrons represent the main sources of background for this kind of experiments. In this paper, we have considered two sources of neutrons: cosmic neutrons and neutrons coming from the accelerating tunnel. Also, cosmic muons are taken into account. The contribution of these parti...

Research paper thumbnail of Measurement of low energy component of the flux of cosmic rays using nuclear track detectors

The effects induced by muons with very low energies are usually neglected. In fact, they could re... more The effects induced by muons with very low energies are usually neglected. In fact, they could represent a source of radioactive background due to capture processes in different materials, which in most of cases produce radioactive isotopes, and thus they must be taken into account. Plastic track detectors have been used in the present paper to measure the ratio between the vertical and horizontal components of the flux of very low energy terrestrial muons at ground level. The data have been collected during 160 days.

Research paper thumbnail of Can strangelets be detected in a large LAr neutrino detector?

Predicted as possible bound states of up, down and strange quarks, strangelets could be more ener... more Predicted as possible bound states of up, down and strange quarks, strangelets could be more energetically favourable and more stable than nuclear matter. In this paper we explore the possibility of detecting such particles with the future large liquid argon detectors developed for neutrino physics. Using signals from ionization and scintillations we suggest that a calorimetric TCP detector is able to put in evidence and to discriminate between light strangelets at intermediate energy. Corresponding author. ar X iv :2 10 7. 05 25 7v 1 [ ph ys ic s. in sde t] 1 2 Ju l 2 02 1

Research paper thumbnail of Muon induced radioactivity in the next generation of neutrino experiments

Research paper thumbnail of Short analysis of cosmogenic production of radioactive isotopes in argon as target for the next neutrino experiments

Radiation Physics and Chemistry

Research paper thumbnail of Silicon detectors for the sLHC

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Dec 1, 2011

In current particle physics experiments, silicon strip detectors are widely used as part of the i... more In current particle physics experiments, silicon strip detectors are widely used as part of the inner tracking layers. A foreseeable large-scale application for such detectors consists of the luminosity upgrade of the Large Hadron Collider (LHC), the super-LHC or sLHC, where silicon detectors with extreme radiation hardness are required. The mission statement of the CERN RD50 Collaboration is the development of radiation-hard semiconductor devices for very high luminosity colliders. As a consequence, the aim of the R&D programme ...

Research paper thumbnail of About detecting very low mass black holes in LAr detectors

Journal of Cosmology and Astroparticle Physics

Research paper thumbnail of Lindhard Factors and Concentrations of Primary Defects in Semiconductor Materials for uses in HEP

Research paper thumbnail of Semiconductor detectors for high radiation fields: microscopic processes in materials and the control of device parameters

Journal of Optoelectronics and Advanced Materials, 2009

Research paper thumbnail of Contribution of the electron-phonon coupling to Lindhard partition at low energy in Ge and Si detectors for astroparticle physics

The influence of the transient thermal effects on the partition of the energy of selfrecoils in g... more The influence of the transient thermal effects on the partition of the energy of selfrecoils in germanium and silicon into energy eventually given to electrons and to atomic recoils respectively is studied. The transient effects are treated in the frame of the thermal spike model, which considers the electronic and atomic subsystems coupled through the electron - phonon interaction. For low energies of selfrecoils, we show that the corrections to the energy partition curves due to the energy exchange during the transient processes modify the Lindhard predictions. These effects depend on the initial temperature of the target material, as the energies exchanged between electronic and lattice subsystems have different signs for temperatures lower and higher than about 15 K. Many of the experimental data reported in the literature support the model.

Research paper thumbnail of New aspects of the contribution of primary defects of silicon to long-time degradation of detectors operating in high fields of radiation

Journal of Optoelectronics and Advanced Materials, 2007

Research paper thumbnail of Elementary Remarks About the Time, Mass and Relativistic Dynamics of Quantum Systems

One of the most profound and difficult problems of physics in the last century is the constructio... more One of the most profound and difficult problems of physics in the last century is the construction of a simple theory which unites the ideas of quantum mechanics and relativity. The concepts which are used in quantum mechanics related to the measurements of positions, momenta, energy and time, are the same concepts in terms of which the special relativistic postulates are formulated. Hence, it is at least possible to formulate the requirement of special relativistic invariance for quantum theories and to ascertain whether these requirements are satisfied. The fact that the answer is nearer to no than to yes, that quantum mechanics has not yet been fully adjusted to the postulates of the special theory, is perhaps irritating. In the general theory of relativity, the situation is different: the space-time coordinates are only auxiliary quantities to which arbitrary values for every event could be given. Hence, the measurement of position, that is, of the space coordin ates, is certainly not a significant measurement if the postulates of the general theory are adopted: any arbitrary value can be given to the coordinates. The same holds for momenta. The purpose of this brief paper is to make in principle some personal and particular remarks on the fundamental concepts of time and mass. Some comments about the consequences on the relativistic dynamics of quantum systems are also formulated.

Research paper thumbnail of The Wave Packet Formalism of Neutrino Oscillations and the Maximal Mixing Scenario

Some aspects of the neutrino o scillation phenomena a re studied in this contribution in the fram... more Some aspects of the neutrino o scillation phenomena a re studied in this contribution in the framework of quantum mechanics wave packet formalism. Based on the experimental arguments we consider the implications of the threefold maximal mixing scenarios in this formalism. Some possible predicted consequences are discussed.

Research paper thumbnail of Mass predictions for baryons

Research paper thumbnail of Silicon detectors operating beyond LHC conditions: scenarios for radiation fields and detector degradation

Research paper thumbnail of Re-Analysis of Some Bubble Chamber Data on NN Annihilation 1

A re-analysis of some pp and pn data, at rest and in flight, obtained in bub- ble chamber experim... more A re-analysis of some pp and pn data, at rest and in flight, obtained in bub- ble chamber experiments, is presented. The (�+�−) and (KSKS) final states for the channels (2�−�+) and (KSKS�) are investigated. Evidence for a narrow meson resonance structure, cautiously suggested as f0(1500), is given. In the (�+�−) invari- ant mass distribution from pn annihilations in flight, using the method of difference spectra, a very clear evidence for �0, f2(1270) and f0(1500) is first time obtained from these data. This re-analysis suggests that the old bubble chamber data can still provide relevant information on the annihilation process in liquid hydrogen and deuterium, and can elucidate controversial aspects of the annihilation mechanism.