M. Romaniuk
A5014111807- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Astronomical and nuclear sciences
- Atomic and Subatomic Physics Research
- Atomic and Molecular Physics
- Superconducting Materials and Applications
- Dark Matter and Cosmic Phenomena
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Advanced NMR Techniques and Applications
- Scientific Computing and Data Management
- Astronomy and Astrophysical Research
- Quantum optics and atomic interactions
- Adaptive optics and wavefront sensing
- Photocathodes and Microchannel Plates
- Distributed and Parallel Computing Systems
- Quantum and electron transport phenomena
- Particle Accelerators and Free-Electron Lasers
- Cold Fusion and Nuclear Reactions
- Advanced Optical Sensing Technologies
- Advanced Semiconductor Detectors and Materials
Institute for Nuclear Research
2009-2024
University of Bonn
2020-2023
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2015-2022
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2022
Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
2020
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2018
University of Messina
2010-2014
Istituto Nazionale di Fisica Nucleare, Sezione di Catania
2010-2014
Istituto Nazionale di Fisica Nucleare
2011-2013
National Academy of Sciences of Ukraine
2009
The BGOOD photoproduction experiment accesses forward meson angles and low momentum exchange kinematics in the $uds$ sector, which may be sensitive to molecular-like hadron structure. Our results strangeness sector suggest a dominant role of meson-baryon dynamics. This includes structures $K^0\Sigma^0$, $K^+\Sigma^0$ $K^+\Sigma^0(1385)$ residing at $\Sigma^{(*)}K^{(*)}$ thresholds have an equivalence $P_C$ states $\Sigma_C^{(*)}\bar D^{(*)}$ thresholds. In non-strange baryon-baryon...
$K^+\Lambda(1405)$ photoproduction has been studied at the BGOOD experiment via all neutral decay, $\Lambda(1405)\rightarrow\Sigma^0\pi^0$. The unique experimental setup allows both cross section and $\Lambda(1405)$ invariant mass distribution (line shape) to be measured over a broad $K^+$ polar angle range, extending extreme forward angles unattainable previous experiments. Evidence is provided for role of triangle singularity driven by $N^*(2030)$ resonance, which appears contribute...
Abstract $$\gamma p \rightarrow K^{+} \Lambda $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>γ</mml:mi> <mml:mi>p</mml:mi> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>K</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mi>Λ</mml:mi> </mml:mrow> </mml:math> differential cross sections and recoil polarisation data from threshold for extremely forward angles are presented. The measurements were performed at the BGOOD experiment ELSA, utilising high angular momentum...
The coherent reaction, $\gamma d \rightarrow \pi^0\pi^0 d$ was studied with the BGOOD experiment at ELSA from threshold to a centre-of-mass energy of 2850\,MeV. A full kinematic reconstruction made, final state deuterons identified in forward spectrometer and $\pi^0$ decays central BGO Rugby Ball. strength differential cross section exceeds what can be described by models photoproduction instead supports three isoscalar dibaryon candidates reported ELPH collaboration 2.38, 2.47...
The fusion excitation function is the important quantity in planning experiments for synthesis of superheavy elements. Its values seem to be determined by experimental study hindrance complete observation mass, angular and energy distributions fissionlike fragments. There ambiguity establishment reaction mechanism leading observed binary fragments can produced quasifission, fast fission, fusion-fission processes which have overlapping mass (angular, kinetic energy) branching ratio between...
The γp→K+Σ0 differential cross section at extremely forward angles was measured the BGOOD experiment. A three-quarter drop in strength over a narrow range energy and strong dependence on polar angle of K+ centre-of-mass reaction is observed 1900 MeV. Residing close to multiple open hidden strangeness thresholds, structure appears consistent with meson-baryon threshold effects which may contribute mechanism.
High energy bremsstrahlung emission during spontaneous fission of 252 Cf is observed. The new experimental method to detect rare coincident events by digital storage oscilloscope used. γ-rays with energies up 60 MeV have been measured (by a BGO detector) in coincidence neutrons detected plastic scintillator. determination γ-ray probability the value about 8 × 10 -9 event/(MeV fission) at E γ = achieved.
The first measurement of the helicity dependence total inclusive 3He photo-absorption cross section and partial sections for several reaction channels was carried out at MAMI (Mainz) in photon energy range between 150 500 MeV. experiment used large acceptance Crystal Ball spectrometer, complemented by charged particle vertex detectors, a circularly polarised tagged beam longitudinally high-pressure gas target. results obtained give information on GDH integral neutron allow an investigation...
In order to explore the possibilities synthesize new superheavy elements with Z =120, 122, 124, 126 some hot-fusion (mass asymmetric) reactions and cold-fusion (less mass are studied. The dynamics of reaction massive nuclei formation probability heavy =90-126 in asymmetric symmetric discussed. systematics fusion P CN evaporation residue cross section σ ER these presented. Moreover, we possibility synthesis by use neutron rich radioactive beam 132 Sn , like 136 Xe + 139,149 La .
By using the dinuclear system (DNS) model we determine capture of reactants at first stage reaction, competition between DNS decay by quasifission (QF) and complete fusion (CF) process up to formation compound nucleus (CN) having compact shape. Further evolution CN is considered as its fission into two fragments or evaporation residues (ER) cooling after emission neutrons or/and charged light particles. Disappearance barrier due fast rotation leads (FF) fissionlike fragments. The results...
Meson photoproduction is a key tool for the experimental investigation of nucleon excitation spectrum. To disentangle specific couplings resonances, in addition to rather well measured pion and eta channels it mandatory obtain information on involving strange vector mesons higher mass pseudoscalar mesons, associated multi-particle final states with both charged neutral particles. In this respect, new BGO-OD experiment at ELSA accelerator University Bonn's Physikalisches Institut provides...
The new applications of the three-dimensional tunnelling and time analysis to low-energy nuclear processes are presented. is strictly quantum-mechanical considers internal multiple reflections. nucleon-nucleons scattering near a resonance, distorted by non-resonant background, does show solution in L -system paradox delay-advance C -system.
Abstract The BGOOD experiment at the ELSA facility in Bonn has been commissioned within framework of an international collaboration. pursues a systematic investigation non-strange and strange meson photoproduction, particular t -channel processes low momentum transfer. setup uniquely combines central almost $$4\pi $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>4</mml:mn><mml:mi>π</mml:mi></mml:mrow></mml:math> acceptance BGO crystal calorimeter with large...
Abstract A search for double-beta decay of $$^{190}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>190</mml:mn> </mml:msup> </mml:math> Pt and $$^{198}$$ <mml:mn>198</mml:mn> with emission $$\gamma $$ <mml:mi>γ</mml:mi> -ray quanta was realized at the HADES underground laboratory a 148 g platinum sample measured by two ultralow-background HPGe detectors over 8946 h. The isotopic composition has been high precision using inductively coupled plasma...
Abstract The differential cross section for the quasi-free photoproduction reaction $$\gamma n\rightarrow K^0\Sigma ^0$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>γ</mml:mi> <mml:mi>n</mml:mi> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>K</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mi>Σ</mml:mi> </mml:mrow> </mml:math> was measured at BGOOD ELSA from threshold to a centre-of-mass energy of $$2400\,\hbox {MeV}$$ <mml:mn>2400</mml:mn> <mml:mspace />...
BGO-OD is a newly commissioned experiment to investigate the internal structure of nucleon, using an energy tagged bremsstrahlung photon beam at ELSA electron facility.The setup consists highly segmented BGO calorimeter surrounding target, with particle tracking magnetic spectrometer forward angles.BGO-OD ideal for investigating meson photoproduction.The extensive physics programme open strangeness photoproduction introduced, and preliminary analysis presented.
The BGOOD photoproduction experiment accesses forward meson angles and low momentum exchange kinematics in the uds sector, which may be sensitive to molecular-like hadron structure. Recent results are presented, including strangeness at angles, π 0 co herent off deuteron.
The coherent reaction, $\gamma d \rightarrow \pi^0\eta d$ was studied with the BGOOD experiment at ELSA from threshold to a centre-of-mass energy of 3200\,MeV. A full kinematic reconstruction made, final state deuterons identified in forward spectrometer and $\pi^0$ $\eta$ decays central BGO Rugby Ball. strength differential cross section exceeds what can be described by models photoproduction angles orders magnitude. distribution has an excellent agreement model including quasi-free $\Delta...
The BGOOD photoproduction experiment accesses forward meson angles and low momentum exchange kinematics in the uds sector, which may be sensitive to molecular-like hadron structure. Recent results are presented, including strangeness at angles, π 0 coherent off deuteron.
The high energy bremsstrahlung γ-rays accompanying the spontaneous fission of 252 Cf were measured in 10–70 MeV range. photons detected by two BGO scintillator detectors (ø7.6cm × 7.6cm) coincidence with neutrons plastic detector, 90° and 180° geometry respect to axis scintillator. distance from 252Cf source was 10 cm, one detector 50 cm. fast digital shape analysis technique time-of-flight method used reject pile-up effects cosmic ray background. γ-ray emission probability 3 10−8photon/(MeV...
The possibility to synthesize heavier superheavy elements in massive nuclei reactions is strongly limited by the hindrance complete fusion of reacting nuclei: due onset quasifission process entrance channel, which competes with fusion, and strong increase fission yield along de-excitation cascade compound nucleus comparison evaporation residue formation. We present a wide detailed procedure allowing us describe experimental results (evaporation fissionlike products) mass asymmetric symmetric...
The differential cross section for $\gamma p\rightarrow K^+\Lambda(1520)$ was measured from threshold to a centre-of-mass energy of 2090\,MeV at forward angles the BGOOD experiment. high statistical precision and resolution in angle allows detailed characterisation this low-momentum transfer kinematic region. data agree with previous LEPS measurement support effective Lagrangian models that indicate contact term dominates near threshold.
Since the discovery of Λ(1405), it remains poorly described by conventional constituent quark models, and is a candidate for having an “exotic” meson-baryon or “penta-quark” structure, similar to states recently reported in hidden charm sector. The Λ(1405) can be produced reaction γp K + Λ(1405). pure I=0 decay mode into Σ 0 π prohibited mass-overlapping Σ(1385). Combining large aperture forward magnetic spectrometer central BGO crystal calorimeter, BGO-OD experiment ideally suited measure...