A. Kalamara
A5015832412- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Nuclear physics research studies
- Radiation Therapy and Dosimetry
- Nuclear Materials and Properties
- Radiation Detection and Scintillator Technologies
- Boron Compounds in Chemistry
- Particle accelerators and beam dynamics
- Radiopharmaceutical Chemistry and Applications
- Atomic and Subatomic Physics Research
- Astronomical and nuclear sciences
- Particle physics theoretical and experimental studies
- Astro and Planetary Science
- Quantum Chromodynamics and Particle Interactions
- Graphite, nuclear technology, radiation studies
- Radiation Effects and Dosimetry
- Gamma-ray bursts and supernovae
- X-ray Spectroscopy and Fluorescence Analysis
- Atomic and Molecular Physics
- Fusion materials and technologies
- Medical Imaging Techniques and Applications
- Chemical Reactions and Isotopes
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- High-Energy Particle Collisions Research
National Centre of Scientific Research "Demokritos"
2020-2024
National Technical University of Athens
2014-2023
Institute of Nuclear & Radiological Sciences and Technology, Energy & Safety
2020-2023
National Taiwan University of Arts
2019
Following the completion of second neutron beam line and related experimental area (EAR2) at n_TOF spallation source CERN, several experiments were planned performed. The high instantaneous flux available in EAR2 allows to investigate induced reactions with charged particles exit channel even employing targets made out small amounts short-lived radioactive isotopes. After successful measurement 7Be(n,α)α cross section, 7Be(n,p)7Li reaction was studied order provide still missing section data...
The $^{241}\mathrm{Am}(n,2n)^{240}\mathrm{Am}$ reaction cross section has been measured at four energies, 10.0, 10.4, 10.8, and 17.1 MeV, by means of the activation technique, relative to $^{27}\mathrm{Al}(n,\ensuremath{\alpha})^{24}\mathrm{Na}$ reference section. Quasi-monoenergetic neutron beams were produced via $^{2}\mathrm{H}(d,n)^{3}\mathrm{He}$ $^{3}\mathrm{H}(d,n)^{4}\mathrm{He}$ reactions 5.5 MV Tandem T11/25 accelerator laboratory NCSR ``Demokritos''. high purity...
The cross section of the $^{197}\mathrm{Au}(n,2n)^{196}\mathrm{Au}$ reaction has been determined at six energies ranging from 15.3--20.9 MeV by means activation technique, relative to $^{27}\mathrm{Al}(n,\ensuremath{\alpha})^{24}\mathrm{Na}$ reaction. Quasimonoenergetic neutron beams were produced via $^{3}\mathrm{H}(d,n)^{4}\mathrm{He}$ 5.5 MV Tandem T11/25 accelerator laboratory NCSR ``Demokritos''. After irradiations, induced $\ensuremath{\gamma}$-ray activity target and reference foils...
The 235U(n, f ) cross section was measured at n_TOF relative to 6Li(n, t) and 10B(n,$ \alpha$) , with high resolution ( $ L=183.49(2)$ m) in a wide energy range (25meV-170keV) 1.5% systematic uncertainty, making use of stack six samples silicon detectors placed the neutron beam. This allowed us make direct comparison yields two reference reactions under same experimental conditions, taking into account forward/backward emission asymmetry. A hint an anomaly 10-30keV had been previously...
The $^{26}\mathrm{Al}(n,p)^{26}\mathrm{Mg}$ reaction is the key impacting on abundances of cosmic $\ensuremath{\gamma}$-ray emitter $^{26}\mathrm{Al}$ produced in massive stars and impacts potential pollution early solar system with by asymptotic giant branch stars. We performed a measurement cross section at high-flux beam line EAR-2 n_TOF facility (CERN). report resonance strengths for eleven resonances, nine being measured first time, while there only one previous other two. Our are...
Monte Carlo simulations were carried out using the MCNP 6.1 code to predict energy deposition at microscopic level in vitro Neutron Capture Therapy studies. Irradiations with neutron beams of energies from 25 meV 14.2 MeV small spherical targets loaded either 1000 ppm natB (200 10B) or natGd (156 157Gd) and located center a phantom simulated. ENDF/B-VII.1 TENDL-2017 libraries, as well INCL4/ABLA Bertini models tested published experimental data benchmark, i.e. proportional counter that...
In the 5.5 MV tandem T11/25 Accelerator Laboratory of NCSR "Demokritos" monoenergetic neutron beams have been produced in energy range∼ 15-20 MeV using anew Ti-tritiated target 373 GBq activity, by means 3H(d,n)4He reaction. The corresponding deuteron beam energies obtained from accelerator, were 1.5-4.5MeV range.The maximum flux has determined to be order 106 n/cm2 s, implementing reference reactions. 17.1MeV used for measurement 197Au(n,2n) reaction cross section. Theoretical calculations...
Abstract The fission cross section of $$^{232}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow/> <mml:mn>232</mml:mn> </mml:msup> </mml:math> Th has been measured at fast neutron energies, using a setup based on Micromegas detectors. experiment was performed the 5.5 MV Van de Graaff Tandem accelerator in beam facility National Centre for Scientific Research “Demokritos”. quasi-monoenergetic beams were produced via $$^{3}$$ <mml:mn>3</mml:mn> H(p,n), $$^{2}$$...
Neutron destruction reactions of the cosmic $\ensuremath{\gamma}$-ray emitter $^{26}\mathrm{Al}$ are importance to determine amount ejected into our galaxy by supernova explosions and for production in asymptotic giant branch stars. We performed a new measurement $^{26}\mathrm{Al}(n,\ensuremath{\alpha})$ reaction up 160-keV neutron energy at time-of-flight facilities n_TOF CERN GELINA EC-JRC. provide strengths ten resonances, six them first time. use data calculate astrophysical reactivities...
The $^{162}\mathrm{Er}(n,2n)^{161}\mathrm{Er}$ reaction cross section (${E}_{th}=9.26\phantom{\rule{0.28em}{0ex}}\mathrm{MeV}$) was measured at six incident neutron beam energies by means of the activation technique. Two energy regions were covered in present work: near-threshold between 10.7 and 11.3 MeV, as well higher from 17.1 up to 19.0 MeV. In this way, range threshold 19 MeV experimentally mapped, considering also existing experimental information around 14 quasi-monoenergetic...
Abstract The 235 U(n,f) cross section was measured in a wide energy range (18 meV–170 keV) at the n_TOF facility CERN, relative to 6 Li(n,t) and 10 B(n,α) standard reactions, with high resolution accuracy, setup based on stack of six samples silicon detectors placed neutron beam. In this paper we report results region between 18 meV keV energy. A resonance analysis has been performed up 200 eV, code SAMMY. resulting fission kernels are compared ones extracted basis parameters most recent...
The $^{72}\mathrm{Ge}(n,\ensuremath{\gamma})$ cross section was measured for neutron energies up to $300\phantom{\rule{4pt}{0ex}}\mathrm{keV}$ at the time-of-flight facility $\mathrm{n}_\mathrm{TOF}$ (CERN), Geneva, first time covering relevant heavy-element synthesis in stars. measurement performed high-resolution beamline EAR-1, using an isotopically enriched $^{72}\mathrm{Ge}\mathrm{O}_{2}$ sample. prompt capture $\ensuremath{\gamma}$ rays were detected with four liquid scintillation...
In this paper, we present a useful Monte Carlo (MC)-based methodology that can be utilized to calculate the absorbed dose and initial levels of complex DNA damage (such as double strand breaks-DSBs) in case an environmental ionizing radiation (IR) exposure incident (REI) i.e., nuclear accident. Our objective is assess doses by isolating only one component total released environment after REI will affect health exposed individual. More specifically, emitted radionuclide 137Cs ground (under...
In the present work $^{165}\mathrm{Ho}(n,2n)$ reaction was studied experimentally and theoretically for population of ground state (${J}^{\ensuremath{\pi}}={1}^{+}$) $^{164}\mathrm{Ho}$ product nucleus, as well its isomeric (${E}_{ex}=139.8$ keV, ${J}^{\ensuremath{\pi}}={6}^{\ensuremath{-}}$). The cross sections both channels were measured at energies near threshold (${E}_{th}=8.04$ MeV), 10.1, 10.4, 10.7 MeV, higher than 17 17.1, 18.1, 19.0, 19.6 MeV. adopted method activation technique...
The cross section of 191Ir(n,2n)190Irg+m1 and 191Ir(n,2n)190Irm2 reactions has been measured at 17.1 20.9 MeV neutron energies the 5.5 MV tandem T11/25 Accelerator Laboratory NCSR "Demokritos", using activation method. beams were produced by means 3H(d,n)4He reaction a flux order 2 × 105 n/cm2s. deduced implementing 27Al(n,α) reaction, while variation beam was monitored BF3 detector. 193Ir(n,2n)192Ir also determined, taking into account contribution from contaminant 191Ir(n,γ)192Ir reaction....
Neutron-induced reaction cross sections are important for a wide variety of research fields ranging from the study nuclear level densities, nucleosynthesis to applications technology like design, and criticality safety assessment existing future reactors, radiation dosimetry, medical applications, waste transmutation, accelerator-driven systems fuel cycle investigations. Simulations calculations largely rely on evaluated data libraries. The evaluations in these libraries based both...
The n_TOF neutron time-of-flight facility at CERN is used for high quality nuclear data measurements from thermal energy up to hundreds of MeV. In line with the open policy, Collaboration takes actions preserve its unique data, facilitate access them in standardised format, and allow their re-use by a wide community fields physics, astrophysics various technologies. present contribution briefly describes outcomes, as well status dissemination preservation final international EXFOR library.
The cross sections of the $^{191}\mathrm{Ir}(n,2n)^{190}\mathrm{Ir}$ and $^{191}\mathrm{Ir}(n,3n)^{189}\mathrm{Ir}$ reactions have been determined by means activation technique, relative to $^{27}\mathrm{Al}(n,\ensuremath{\alpha})^{24}\mathrm{Na}$ reaction, at neutron beam energies higher than 15 MeV. quasi-monoenergetic beams were produced 5.5 MV Tandem T11/25 Accelerator Laboratory NCSR ``Demokritos'' implementing $^{3}\mathrm{H}(d,n)^{4}\mathrm{He}$ reaction. induced...
In counting experiments associated with pulsed sources, a high data collection rate can lead to considerably large losses, especially in the case of spallation Time-of-Flight facilities equipped medium and short flight paths where research interest is focused on higher neutron energies losses be quite due flux, more compressed time frame compared one lower cross-section depending reaction. Examples such measurements are induced fission at new experimental area EAR-2 n_TOF facility CERN....
In the measurement of neutron capture cross-sections fissile isotopes, fission channel is a source background which can be removed efficiently using so-called fission-tagging or fission-veto technique. For this purpose new compact and fast chamber has been developed. The design criteria technical description are given within context 233U(n, γ) cross-section at n_TOF facility CERN, where it was coupled to Total Absorption Calorimeter. detector optimized for time resolution, minimization...
The ISOLDE radioactive beam facility is the dedicated CERN installation for production and acceleration of nuclei.Exotic nuclei most chemical elements are available study nuclear structure, astrophysics, fundamental symmetries atomic physics, as well applications in condensed matter life sciences.In order to broaden scientific opportunities beyond reach present facility, on-going HIE-ISOLDE (High Intensity Energy) project provides major improvements energy range, intensity quality.A element...
Boron Neutron Capture Therapy (BNCT) is a promising re-emerging therapeutic approach for brain tumors, such as glioblastoma multiforme, where conventional treatments have limited efficacy. BNCT based on neutron irradiation of tumors to selectively kill malignant cells that accumulated boron compounds with high LET particles produced from the thermal absorption reaction in 10B. Two sets simulations were performed using MCNP6.1 code. The first involves study dose components function depth...