T. Ishiwatari
A5019735386- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Atomic and Molecular Physics
- Nuclear physics research studies
- Radioactive Decay and Measurement Techniques
- High-pressure geophysics and materials
- X-ray Spectroscopy and Fluorescence Analysis
- Quantum Mechanics and Applications
- Ionosphere and magnetosphere dynamics
- Muon and positron interactions and applications
- Nuclear Physics and Applications
- Particle Detector Development and Performance
- Geophysics and Gravity Measurements
- Quantum, superfluid, helium dynamics
- Earthquake Detection and Analysis
- History and advancements in chemistry
- Biofield Effects and Biophysics
- Cold Atom Physics and Bose-Einstein Condensates
- Dark Matter and Cosmic Phenomena
- Superconducting Materials and Applications
- Scientific Research and Discoveries
- Magnetic confinement fusion research
- Advanced Chemical Physics Studies
Stefan Meyer Institute for Subatomic Physics
2010-2022
Austrian Academy of Sciences
2007-2022
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2001-2019
European Organization for Nuclear Research
2016
Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering
2011-2015
University of Vienna
2015
Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre
2015
Jagiellonian University
2015
Institute of Physics
2015
Sapienza University of Rome
2015
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...
The DEAR (DAPhiNE exotic atom research) experiment measured the energy of x rays emitted in transitions to ground state kaonic hydrogen. values for shift epsilon and width Gamma 1s due K(-)p strong interaction are epsilon(1s)=-193 +/- 37 (stat) 6 (syst) eV Gamma(1s)=249 111 30 eV, most precise yet obtained. pattern hydrogen K-series lines, K(alpha), K(beta), K(gamma), was disentangled first time.
Kaonic atoms are exotic atomic systems where an electron is replaced by a negatively charged kaon which also experiences the strong interaction with nucleus. Precision spectroscopy of kaonic represents excellent tool to study particles strangeness. This work reviews progress and prospects in modern era atom experiments, discusses constraints on low-energy theories strangeness sector.
We have measured the Balmer-series x-rays of kaonic $^4$He atoms using novel large-area silicon drift x-ray detectors in order to study low-energy $\bar{K}$-nucleus strong interaction. The energy $3d \to 2p$ transition was determined be 6467 $\pm$ 3 (stat) 2 (syst) eV. resulting strong-interaction energy-level shift is agreement with theoretical calculations, thus eliminating a long-standing discrepancy between theory and experiment.
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 Pauli exclusion principle (PEP) is one of the basic principles modern physics and, even if there are no compelling reasons to doubt its validity, it still debated today because an intuitive, elementary explanation missing, and unique stand among symmetries physics. present Letter reports a new limit on probability that PEP violated by electrons, in search for anomalous Kα line copper: presence this soft X-ray copper fluorescence would signal transition ground state already occupied 2...
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 observed an intense high-energy component in inclusive He4(stopped K−,d) spectrum. For back-to-back Λd pairs a prominent event cluster has been found just below the m4He+mK−−mn mass threshold invariant spectrum of Λdn events, which is evidence for three-nucleon absorption process K− He4. In addition, appreciable strength revealed ~3220 MeV/c2. Well separated Σ0dn events show peak similar to case Λdn.Received 5 September 2007DOI:https://doi.org/10.1103/PhysRevC.76.068202©2007 American...
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...
The first measurement of the yields three kaonic nitrogen X-ray transitions, using DEAR (DAΦNE Exotic Atom Research) setup at DAΦNE collider Frascati, is reported. are 41.5±8.7(stat.)±4.1(sys.)% for n=7→6 transition, 55.0±3.9(stat.)±5.5(sys.)% n=6→5 transition and 57.4±15.2(stat.)±5.7(sys.)% n=5→4 a density ρ=3.4ρNTP. By experimental in an atomic cascade calculation, 1 to 3% K-shell electron population n=6 level was deduced.
We have investigated non-mesonic reactions of the stopped K − on 4 He in terms correlations coincident ΛN pairs. As result, Λp and Λn branches two-nucleon absorption process were clearly observed invariant mass spectra. The spin-isospin dependence was for first time.
The $(3p\ensuremath{-}1s)$ x-ray transition to the muonic hydrogen ground state was measured with a high-resolution crystal spectrometer. A Doppler effect broadening of line established which could be attributed different Coulomb deexcitation steps preceding transition. assumption statistical population hyperfine levels directly confirmed by experiment, and values for splitting can reported. results allow decisive test advanced cascade model calculations establish method extract fundamental...
A new spectrometer system has been designed and constructed at the secondary beam line K1.8BR in hadron hall of J-PARC to investigate |$\bar {K} N$| interactions {K}$|-nuclear bound systems. The consists a high precision spectrometer, liquid 3He/4He/D2 target system, cylindrical detector that surrounds detect decay particles from region, neutron time-of-flight counter array located ∼15 m downstream position. Details design, construction, performance components are described.
One of the fundamental rules nature and a pillar in foundation quantum theory thus modern physics is represented by Pauli Exclusion Principle. We know that this principle extremely well fulfilled due to many observations. Numerous experiments were performed search for tiny violation rule various systems. The experiment VIP at Gran Sasso underground laboratory searching possible small violations Principle electrons leading forbidden X-ray transitions copper atoms. aiming test with high...