A5010180485- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- Particle physics theoretical and experimental studies
- Nuclear Materials and Properties
- Radiation Therapy and Dosimetry
- Astro and Planetary Science
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Atomic and Subatomic Physics Research
- High-Energy Particle Collisions Research
- Superconducting Materials and Applications
- Gamma-ray bursts and supernovae
- Astronomical and nuclear sciences
- Thermochemical Biomass Conversion Processes
- Subcritical and Supercritical Water Processes
- Particle accelerators and beam dynamics
- Lignin and Wood Chemistry
- Boron Compounds in Chemistry
- Advanced Mathematical Physics Problems
- Nonlinear Waves and Solitons
- Particle Accelerators and Free-Electron Lasers
- Nonlinear Photonic Systems
- Parallel Computing and Optimization Techniques
University of Łódź
2016-2024
Australian National University
2020
The degradation of biomass is studied in the ranges 330−410 °C and 30−50 MPa at 15 min reaction time. To characterize chemistry degradation, key compounds which are intermediates identified quantified. These used to compare results from earlier studies model such as, e.g., glucose or cellulose, with order identify chemical pathways. Key phenols (phenol cresols), furfurals, acids (acetic acid, formic lactic acids, levulinic acid), aldehydes aldehyde aldehyde). In addition, sum parameters as...
The energy-dependent cross section of the ^{7}Be(n,α)^{4}He reaction, interest for so-called cosmological lithium problem in big bang nucleosynthesis, has been measured first time from 10 meV to keV neutron energy. challenges posed by short half-life ^{7}Be and low reaction have overcome at n_TOF thanks an unprecedented combination extremely high luminosity good resolution beam new experimental area (EAR2) facility CERN, availability a sufficient amount chemically pure ^{7}Be, specifically...
We report on the measurement of ^{7}Be(n,p)^{7}Li cross section from thermal to approximately 325 keV neutron energy, performed in high-flux experimental area (EAR2) n_TOF facility at CERN. This reaction plays a key role lithium yield big bang nucleosynthesis (BBN) for standard cosmology. The only two previous time-of-flight measurements this did not cover energy window interest BBN, and they showed large discrepancy between each other. was with Si telescope high-purity sample produced by...
Nuclear data in general, and neutron-induced reaction cross sections particular, are important for a wide variety of research fields. They play key role the safety criticality assessment nuclear technology, not only existing power reactors but also radiation dosimetry, medical applications, transmutation waste, accelerator-driven systems, fuel cycle investigations future reactor systems as Generation IV. Applications related to fields study level densities stellar nucleosynthesis....
The spent fuel of current nuclear reactors contains fissile plutonium isotopes that can be combined with uranium to make mixed oxide (MOX) fuel. In this way the Pu from is used in a new reactor cycle, contributing long-term sustainability energy. However, an extensive use MOX fuels, particular fast reactors, requires more accurate capture and fission cross sections for some isotopes. case $^{242}\mathrm{Pu}$ there are sizable discrepancies among existing cross-section measurements included...
The newly built second experimental area EAR2 of the n_TOF spallation neutron source at CERN allows to perform (n, charged particles) experiments on short-lived highly radioactive targets. This paper describes a detection apparatus and procedure for determination cross-section 7Be(n,α)α reaction, which represents one focal points toward solution cosmological Lithium abundance problem, whose only measurement, thermal energy, dates back 1963. apparently unsurmountable difficulties stemming...
The neutron capture cross sections of several unstable nuclides acting as branching points in the $s$ process are crucial for stellar nucleosynthesis studies. $^{171}\mathrm{Tm}$ (${t}_{1/2}=1.92\text{ }\text{ }\mathrm{yr}$) is part around mass $A\ensuremath{\sim}170$ but its section a function energy not known to date. In this work, following production first time more than 5 mg at high-flux reactor Institut Laue-Langevin France, sample was produced Paul Scherrer Institute Switzerland. Two...
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...
Neutron capture data on intermediate mass nuclei are of key importance to nucleosynthesis in the weak component slow neutron processes, which occurs massive stars. The $(n,\ensuremath{\gamma})$ cross section $^{70}\mathrm{Ge}$, is mainly produced $s$ process, was measured at time-of-flight facility n_TOF CERN. Resonance kernels were determined up 40 keV energy and average sections 300 keV. Stellar calculated from $kT=5$ $kT=100$ very good agreement with a previous measurement by Walter Beer...
73Ge(n,γ) cross sections were measured at the neutron time-of-flight facility n_TOF CERN up to energies of 300 keV, providing for first time experimental data above 8 keV. Results indicate that stellar section kT=30 keV is 1.5 1.7 times higher than most theoretical predictions. The new result in a substantial decrease 73Ge produced stars, which would explain low isotopic abundance solar system.
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 neutron capture cross section of 154Gd was measured from 1 eV to 300 keV in the experimental area located 185 m CERN n_TOF spallation source, using a metallic sample gadolinium, enriched 67% 154Gd. measurement, performed with four C6D6 scintillation detectors, has been complemented by transmission measurement at GELINA time-of-flight facility (JRC-Geel), thus minimising uncertainty related composition. An accurate Maxwellian averaged (MACS) deduced over temperature range interest for s...
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...
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...
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...
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...
Since the start of its operation in 2001, based on an idea Prof. Carlo Rubbia [1], neutron time of-flight facility CERN, n_TOF, has become one most forefront facilities world for wide-energy spectrum cross section measurements. Thanks to combination excellent energy resolution and high instantaneous flux available two experimental areas, second which been constructed 2014, n_TOF is providing a wealth new data neutron-induced reactions interest nuclear astrophysics, advanced technologies...
The 33S(n,α)30Si cross section measurement, using 10B(n,α) as reference, at the n_TOF Experimental Area 2 (EAR2) facility CERN is presented. Data from 0.01 eV to 100 keV are provided and, for first time, measured in range 10 keV. These data may be used a future evaluation of because present evaluations exhibit large discrepancies. reaction interest medical physics its possible use cooperative target boron Neutron Capture Therapy (NCT).
A new experimental area, the NEAR station, has recently been built at CERN n TOF facility, a short distance from spallation target (1.5 m). The characterized by neutron beam of very high flux, designed with purpose performing activation measurements interest for astrophysics and various applications. is transported to station through hole in shielding wall target, inside which collimator inserted. area complemented {\gamma}-ray spectroscopy laboratory, GEAR equipped efficiency HPGe detector,...
The neutron-induced fission cross section of $^{230}\mathrm{Th}$ has been measured at the neutron time-of-flight facility n_TOF located CERN. experiment was performed experimental area EAR-1 with a flight path 185 m, using Micromegas detectors for detection fragments. $^{230}\mathrm{Th}(n,f)$ determined relative to $^{235}\mathrm{U}(n,f)$ one, covering energy range from threshold up 400 MeV. results present work are compared existing cross-section datasets and observed discrepancies...
The study of the resonant structures in neutron-nucleus cross-sections, and therefore compound-nucleus reaction mechanism, requires spectroscopic measurements to determine with high accuracy energy neutron interacting material under study.
Accurate neutron capture cross section data for minor actinides (MAs) are required to estimate the production and transmutation rates of MAs in light water reactors with a high burnup, critical fast like Gen-IV systems other innovative reactor such as accelerator driven (ADS). Capture reactions 244 Cm open path formation heavier isotopes elements Bk Cf. In addition, shares nearly 50% total actinide decay heat irradiated fuels even after three years cooling. Experimental this isotope very...