A5034749686- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Radioactive Decay and Measurement Techniques
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Quantum Mechanics and Applications
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- X-ray Spectroscopy and Fluorescence Analysis
- High-pressure geophysics and materials
- Ionosphere and magnetosphere dynamics
- Biofield Effects and Biophysics
- Noncommutative and Quantum Gravity Theories
- Muon and positron interactions and applications
- Advanced Semiconductor Detectors and Materials
- History and advancements in chemistry
- Quantum, superfluid, helium dynamics
- Neutrino Physics Research
- Geophysics and Gravity Measurements
- Atomic and Molecular Physics
- Magnetic confinement fusion research
- Solar and Space Plasma Dynamics
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2016-2025
Istituto Nazionale di Fisica Nucleare
2018-2025
Nippon Soken (Japan)
2019-2022
RIKEN
2010-2022
Japan Atomic Energy Agency
2019-2022
Tokyo Institute of Technology
2010-2022
Excellence Cluster Universe
2021-2022
Technical University of Munich
2022
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2022
Czech Academy of Sciences, Institute of Physics
2022
The $\bar{K}N$ system at threshold is a sensitive testing ground for low energy QCD, especially the explicit chiral symmetry breaking. Therefore, we have measured $K$-series x rays of kaonic hydrogen atoms DA$\Phi$NE electron-positron collider Laboratori Nazionali di Frascati, and determined most precise values strong-interaction energy-level shift width $1s$ atomic state. As x-ray detectors, used large-area silicon drift detectors having excellent timing resolution, which were developed...
We report the measurement of K− absorption processes in Σ0p final state and first exclusive two nucleon (2NA) with KLOE detector. The 2NA process without further interactions is found to be 9% sum all other contributing processes, including on three more nucleons or followed by residual nucleons. also determine possible contribution ppK− bound state. yield ppK−/Kstop− (0.044±0.009stat−0.005+0.004syst)⋅10−2 but its statistical significance based an F-test only 1σ.
We observed a distinct peak in the Λp invariant mass spectrum of He3(K−,Λp)n, well below mK+2mp, i.e., threshold K− to be bound two protons. By selecting relatively large momentum-transfer region q=350∼650 MeV/c, one can kinematically separate from quasi-free process, K‾N→K‾N followed by non-resonant absorption spectator-nucleons K‾NN→ΛN. found that simplest fit gives us Breit–Wigner pole position at BKpp=47±3(stat.)−6+3(sys.) MeV having width ΓKpp=115±7(stat.)−20+10(sys.) MeV, and S-wave...
Abstract Particle identification techniques are fundamental tools in nuclear physics experiments. Discriminating particles or nuclei produced interactions allows to better understand the underlying mechanisms. The energy interval of these reactions is very broad, from sub-eV up TeV. For this reason, many different approaches have been developed, often combining two more observables. This paper reviews several with emphasis on expertise gained within current scientific program Italian...
About a hundred years ago, the Russian biologist A. Gurwitsch, based on experiments with onion plants by measuring their growth rate, hypothesized that emit weak electromagnetic field somehow influences cell growth. This interesting observation remained fundamentally ignored scientific community; only in 1950s emission from some was measured using photomultiplier used single counting mode. Later, 1980s, several groups around world started extensive work to understand origin and role of this...
A model where a Dirac fermion is coupled to background dilaton field considered study s-wave scattering of by back ground black hole. It found that an uncomfortable situation towards information loss scenario arises when one loop correction gets involved during bosonization.
The possible existence of deeply bound $\bar K$-nucleus states (kaonic nuclei) has been widely discussed as a consequence the strongly attractive K N$ interaction in I = 0 channels. For simplest kaonic nucleus, KNN$, we observed significant peak structure that can be interpreted ``$K^-pp$'' state using $^3$He$(K^-,N)$ reactions at J-PARC. To further understand nuclei, have proposed and prepared an experiment to precisely measure NNN$ system $^4$He$(K^-,N)$ first step towards comprehensive...
The SIDDHARTA-2 collaboration is performing research in the field of kaonic atoms spectroscopy. In this work, following an introduction on and their importance for development low-energy strong interaction theories, first result experiment (kaonic helium) presented. This measurement was promising view main goal experiment, i.e. deuterium transitions to 1s level, important model kaon-nucleon interaction. last part paper future plans measure new key quantities with beyond stat-of-the-art...
High-Precision X-ray Measurements 2023 is a Special Issue of the journal Condensed Matter enclosing scientific content (HPXRM) conference [...]
A large area silicon drift detectors (SDDs) system and its readout electronics have been developed by the SIDDHARTA-2 Collaboration, aiming to perform high-precision light kaonic atoms x-ray spectroscopy for investigation of strong interaction in low-energy QCD regime. To these measurements, a linear energy response good resolution are mandatory requirements system, be preserved along whole DAQ (analog digital) chain; such task is made even harder experimental environment particles...
Abstract The current work presents the optimization of large area silicon drift detectors developed by SIDDHARTA-2 collaboration for high precision x-ray measurements light exotic atom transitions. Two different radiation sources were employed in study: an tube, investigating energy resolution and charge collection efficiency device range 4000 eV–13 000 eV, a β − 90 Sr radioactive source measuring timing response, thus qualifying parameters inside semiconductor. study reports spectroscopic...
The kaonic (3)He and (4)He X-rays emitted in the [Formula: see text] transitions were measured SIDDHARTA experiment. widths of 2p states determined to be text], respectively. Both results are consistent with theoretical predictions. width is much smaller than value by experiments performed 70's 80's, while was for first time.
We have measured the 3d→2p transition x rays of kaonic ^{3}He and ^{4}He atoms using superconducting transition-edge-sensor microcalorimeters with an energy resolution better than 6 eV (FWHM). determined energies to be 6224.5±0.4(stat)±0.2(syst) 6463.7±0.3(stat)±0.1(syst) eV, widths 2.5±1.0(stat)±0.4(syst) 1.0±0.6(stat)±0.3(stat) for ^{4}He, respectively. These values are nearly 10 times more precise in previous measurements. Our results exclude large strong-interaction shifts that suggested...
Pauli exclusion principle (PEP) violations induced by space-time noncommutativity, a class of universality for several models quantum gravity, are investigated the VIP-2 Lead experiment at Gran Sasso underground National Laboratory INFN. The experimental bound on noncommutative scale $\mathrm{\ensuremath{\Lambda}}$ excludes $\ensuremath{\theta}$-Poincar\'e far above Planck non anishing ``electriclike'' components ${\ensuremath{\theta}}_{\ensuremath{\mu}\ensuremath{\nu}}$, and up to...
The most important information still missing in the field of low-energy antikaon-nucleon inter actions studies is experimental determination hadronic energy shift and width kaonic deuterium. This measurement will be performed by SIDDHARTA-2 experiment, installed at DAΦNE collider presently data taking campaign. precise 1s level with respect to purely electromagnetic calculated values, generated presence strong interaction, through X-ray transitions this level, hydrogen, was SIDDHARTA...
The spin–statistics connection, in particular the Pauli exclusion principle (PEP), plays a very important role our comprehension of matter and nature. Presently, PEP violation, possible within some theories, generates lively debate; it has given birth to few experiments looking for tiny effects. violation experiment put strong limit on probability by electrons, using method searching forbidden atomic transitions copper target. In this paper we present experiment, obtained results future...
To search for an |${\rm S} = -1$| di-baryonic state which decays to |$\Lambda p$|, the |${}^3{\rm He}(K^-,\Lambda p)n_{\rm missing}$| reaction was studied at 1.0 GeV}/c$|. Unobserved neutrons were kinematically identified from missing mass |$M_{X}$| of p)X$| in order have a large acceptance pn$| final state. The observed events, distributed widely over allowed region Dalitz plot, establish that major component comes three-nucleon absorption process. A concentration events specific neutron...
We present the analysis of K− absorption processes on He4 leading to Λπ− final states, measured with KLOE spectrometer at DAΦNE e+e− collider and extract, for first time, modulus non-resonant K−n →Λπ− direct production amplitude about 33 MeV below K‾N threshold. This also allows disentangle nuclear at-rest from in-flight capture, momenta 120 MeV. The data are interpreted help a phenomenological model, is found be |AK−n→Λπ−|=(0.334±0.018stat−0.058+0.034syst)fm.
The determination of low-energy cross sections and branching ratios the $$\hbox {K}^-$$ multi-nucleon absorption processes in $$\Lambda \hbox {p}$$ $$\Sigma ^0\hbox final states performed by AMADEUS collaboration is presented. Low momentum ( $$p_{\mathrm{K}} \simeq 127\ {MeV}/\hbox {c}$$ ) produced at {DA}\Phi {NE}$$ collider are impinged on a Carbon target within KLOE detector two three nucleon disentangled comparing experimental data to phenomenological calculations. spectra interpreted...
The VIolation of Pauli exclusion principle -2 experiment, or VIP-2 at the Laboratori Nazionali del Gran Sasso searches for X-rays from copper atomic transitions that are prohibited by principle. Candidate direct violation events come transition a 2p electron to ground state is already occupied two electrons. From first data taking campaign in 2016 we determined best upper limit [Formula: see text] probability such exists. Significant improvement control experimental systematics was also...
Novel, large-area silicon drift detectors (SDDs) have been developed to perform precision measurements of kaonic atom X-ray spectroscopy, for the study K ¯ N strong interaction in low-energy regime. These devices special geometries, field configurations and read-out electronics, resulting excellent performances terms linearity, stability energy resolution. In this work SDDs response region between 4000 eV 12,000 is reported, revealing a stable linear within 1 good
We have performed an exclusive measurement of the K−+He3→Λpn reaction at incident kaon momentum 1GeV/c. In Λp invariant mass spectrum, a clear peak was observed below threshold K¯+N+N, as signal kaonic nuclear bound state, K¯NN. The binding energy, decay width, and S-wave Gaussian form factor this state were to be BK=42±3(stat.)−4+3(syst.)MeV, ΓK=100±7(stat.)−9+19(syst.)MeV, QK=383±11(stat.)−1+4(syst.)MeV/c, respectively. total production cross section K¯NN, determined by its mode,...