A5107303881- Quantum Chromodynamics and Particle Interactions
- Nuclear physics research studies
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum, superfluid, helium dynamics
- Atomic and Molecular Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Black Holes and Theoretical Physics
- Quantum chaos and dynamical systems
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Advanced Chemical Physics Studies
- Advanced NMR Techniques and Applications
- Nuclear Physics and Applications
- Physics of Superconductivity and Magnetism
- Nuclear reactor physics and engineering
- Neutrino Physics Research
- Superconductivity in MgB2 and Alloys
- X-ray Spectroscopy and Fluorescence Analysis
- Dark Matter and Cosmic Phenomena
- Cold Fusion and Nuclear Reactions
- Particle accelerators and beam dynamics
- Advanced Physical and Chemical Molecular Interactions
- Spectral Theory in Mathematical Physics
- Superconducting and THz Device Technology
Nara Women's University
2015-2024
High Energy Accelerator Research Organization
2014-2019
Institute of Physics
2015
Sapienza University of Rome
2015
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2015
Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre
2015
National Centre for Nuclear Research
2015
Jagiellonian University
2015
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2015
Austrian Academy of Sciences
2014
Deeply bound 1s states of pi(-) in (115,119,123)Sn were preferentially observed using the Sn(d,3He) pion-transfer reaction under recoil-free condition. The binding energies and widths precisely determined used to deduce isovector parameter s-wave pion-nucleus potential be b1=-(0.115+/-0.007)m(-1)(pi). enhancement |b(1)| over free piN value (b(free)1/b1=0.78+/-0.05) indicates a reduction chiral order parameter, f*pi(rho)2/f2pi approximately 0.64, at normal nuclear density, rho=rho(0).
We observed well-separated 1s and 2p pi(-) states in 205Pb the 206Pb(d,3He) reaction at T(d) = 604.3 MeV. The binding energies widths determined are B(1s) 6.762+/-0.061 MeV, Gamma(1s) 0.764(+0.154)(-0.171) B(2p) 5.110+/-0.045 Gamma(2p) 0.321(-0.062)(+0.060) They used to deduce real imaginary strengths of s-wave part pion-nucleus interaction, which translates into a positive mass shift 205Pb.
We discuss theoretically the possibility of observing bound states \ensuremath{\eta} and ${\ensuremath{\eta}}^{'}(958)$ mesons in nuclei. apply NJL model to study ${\ensuremath{\eta}}^{'}$ meson properties at finite density calculate formation cross sections with Green function method for ($\ensuremath{\gamma},p$) reaction. also experimental feasibility photon facilities like SPring-8. The contributions due \ensuremath{\omega} production are included obtain realistic spectra. conclude that...
The in-medium mass of the $\eta^{\prime}$ meson is discussed in a context partial restoration chiral symmetry nuclear medium. expected to be reduced by order 100 MeV at saturation density. reduction consequence suppression anomaly effect on induced symmetry. This strong attraction systems does not accompany large absorption into matter. leads possibility so narrow bound states nuclei seen hadronic reactions with light targets.
We calculate theoretically the formation spectra of ${\ensuremath{\eta}}^{\ensuremath{'}}(958)$-nucleus systems in $(p,d)$ reaction for investigation in-medium modification ${\ensuremath{\eta}}^{\ensuremath{'}}$ mass. show comprehensive numerical calculations based on a simple form optical potential nuclei with various depths. conclude that one finds evidence possible attractive interaction between and nucleus as peak structure appearing around threshold light such ${}^{11}$C, when is...
A novel method is proposed to measure eta'(958) meson bound states in 11C nuclei by missing mass spectroscopy of the 12C(p,d) reaction near eta' production threshold. It shown that peak structures will be observed experimentally an inclusive measurement case in-medium reduction sufficiently large and decay width mesic narrow enough. Such a feasible with intense proton beam supplied SIS synchrotron at GSI combined good energy resolution fragment separator FRS.
Excitation spectra of $^{11}\mathrm{C}$ are measured in the $^{12}\mathrm{C}(p,d)$ reaction near ${\ensuremath{\eta}}^{\ensuremath{'}}$ emission threshold. A proton beam extracted from synchrotron SIS-18 at GSI with an incident energy 2.5 GeV impinges on a carbon target. The momenta deuterons emitted 0\ifmmode^\circ\else\textdegree\fi{} precisely fragment separator (FRS) operated as spectrometer. In contrast to theoretical predictions possible existence deeply bound...
We discuss the possibility to produce bound states of $\eta'(958)$ meson in nuclei theoretically. calculate formation cross sections $\eta'$ with Green function method for ($\gamma$,p) reaction and experimental feasibility at photon facilities like SPring-8. conclude that we can expect observe resonance peaks spectra deduce new information on properties finite density. These observations are believed be essential know possible mass shift effective restoration chiral $U_A(1)$ anomaly nuclear medium.
The structure of eta-nucleus bound systems (eta mesic nuclei) is investigated as one the tools to study in-medium properties N(1535) (N^*) resonance by using chiral doublet model incorporate medium effects N^* in a symmetric way. We find that shape and depth optical potential are strongly affected nucleon. Especially, general feature potential, existence repulsive core at nuclear center with an attractive part surface concluded. calculate level states this 'central-repulsive...
Using recent results obtained within the hidden gauge formalism for vector mesons, in which $f_0(1370)$ and $f_2(1270)$ resonances are dynamically generated from $\rho \rho$ interaction, we evaluate radiative decay of these into $\gamma \gamma$. We obtain width good agreement with experimental data state a about factor five smaller resonance, would agree preliminary Belle collaboration, hinting at an order magnitude this resonance than $f_2(1270)$.
High-resolution pionic atom X-ray spectroscopy was performed with an spectrometer based on a 240 pixel array of superconducting transition-edge sensor (TES) microcalorimeters at the πM1 beam line Paul Scherrer Institute. X-rays emitted by carbon via 4f→3d transition and parallel 4d→3p were observed full width half maximum energy resolution 6.8 eV 6.4 keV. The measured energies are consistent calculated electromagnetic values which considered strong interaction effect assessed Seki–Masutani...
We study theoretically the kaonic atom and nucleus formations in in-flight (${K}^{\ensuremath{-}},p$) reactions using Green function method, which is suited to evaluate formation rates both of stable unstable bound systems. consider $^{12}\mathrm{C}$ $^{16}\mathrm{O}$ as targets calculate spectra reactions. conclude that no peak structure resulting from expected reaction calculated with chiral unitary kaon-nucleus optical potential. In phenomenological deep potential, it may be possible...
We calculate formation spectra of the $\ensuremath{\eta}$-nucleus systems in ($\ensuremath{\pi},N$) reactions with nuclear targets, which can be performed at existing and/or forthcoming facilities, including Japan Proton Accelerator Research Complex, to investigate interaction. Based on ${N}^{*}(1535)$ dominance $\ensuremath{\eta}N$ system, $\ensuremath{\eta}$-mesic nuclei are suitable for study in-medium properties baryon resonance, such as reduction mass difference $N$ and ${N}^{*}$...
Excitation-energy spectra of $^{11}\mathrm{C}$ nuclei near the ${\ensuremath{\eta}}^{\ensuremath{'}}$-meson production threshold have been measured by missing-mass spectroscopy using $^{12}\mathrm{C}(p,d)$ reaction. A carbon target has irradiated with a 2.5 GeV proton beam supplied synchrotron SIS-18 at GSI to produce bound states in nuclei. Deuterons emitted ${0}^{\ensuremath{\circ}}$ reaction momentum analyzed fragment separator (FRS), used as high-resolution spectrometer. No distinct...
We study theoretically the formation spectra of deeply bound pionic atoms expected to be observed by experiments with high energy resolution at RIBF/RIKEN, and we discuss in detail possibilities extract new information on pion properties finite density from spectra, which may provide partial restoration chiral symmetry medium. find that non-yrast states such as 2 s are seen ( d , 3 He) will helpful reduce uncertainties theoretical calculations neutron wave functions nucleus. The observation...
The properties of eta-nucleus interaction and their experimental consequences are investigated with optical potentials obtained by postulating the N*(1535) dominance for eta-N system. in nuclear medium evaluated two kinds chiral effective models based on distinct pictures N*(1535). We find that these provide qualitatively different eta meson, reflecting in-medium models. In order to compare physical observables, we calculate spectra (d,3He) reactions mesic nucleus formation various target...