A5054537109- Quantum Chromodynamics and Particle Interactions
- Nuclear physics research studies
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Advanced NMR Techniques and Applications
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Particle Accelerators and Free-Electron Lasers
- Quantum, superfluid, helium dynamics
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Dark Matter and Cosmic Phenomena
- Scientific Research and Discoveries
- Magnetic confinement fusion research
- Muon and positron interactions and applications
- Advanced Chemical Physics Studies
- Neutrino Physics Research
- Mechanical and Optical Resonators
- Scientific Computing and Data Management
- Magnetic properties of thin films
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Data Storage Technologies
- Geophysical and Geoelectrical Methods
- Experimental and Theoretical Physics Studies
University of Ferrara
2018-2024
Istituto Nazionale di Fisica Nucleare
2021-2024
Joint Institute for Nuclear Research
2012-2021
Forschungszentrum Jülich
2007-2020
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2019
McGill University
2017
Friedrich-Alexander-Universität Erlangen-Nürnberg
2008-2013
Petersburg Nuclear Physics Institute
2009-2011
Tbilisi State University
2009
University of Cologne
2009
The differential and total cross sections for the dp→3Heη reaction have been measured in a high precision statistics COSY-ANKE experiment near threshold using continuous beam energy ramp up to an excess Q of 11.3 MeV with essentially 100% acceptance. kinematics allowed mean value be determined about 9 keV. Evidence is found effects higher partial waves Q≳4 MeV. very rapid rise section its maximum within 0.5 implies large η3He scattering length hence presence quasibound state extremely close...
A new method to determine the spin tune is described and tested. In an ideal planar magnetic ring, tune-defined as number of precessions per turn-is given by ν(s)=γG (γ Lorentz factor, G gyromagnetic anomaly). At 970 MeV/c, deuteron spins coherently precess at a frequency ≈120 kHz in Cooler Synchrotron COSY. The deduced from up-down asymmetry deuteron-carbon scattering. time interval 2.6 s, was determined with precision order 10^{-8}, 1×10^{-10} for continuous 100 s accelerator cycle. This...
We observe a deuteron beam polarization lifetime near 1000 s in the horizontal plane of magnetic storage ring (COSY). This long spin coherence time is maintained through combination bunching, electron cooling, sextupole field corrections, and suppression collective effects current limits. record required for search an intrinsic electric dipole moment on at statistical sensitivity level approaching 10^{-29} e cm.
The production of phi mesons in the collisions 2.83 GeV protons with C, Cu, Ag, and Au at forward angles has been measured via -> K+K- decay using COSY-ANKE magnetic spectrometer. meson cross section follows a target mass dependence A^0.56+/-0.02 momentum region 0.6-1.6 GeV/c. comparison data model calculations suggests that in-medium width is about an order magnitude larger than its free value.
Based on the notion that local dark-matter field of axions or axionlike particles (ALPs) in our Galaxy induces oscillating couplings to spins nucleons and nuclei (via electric dipole moment latter and/or paramagnetic axion-wind effect), we establish feasibility a new method search for ALPs storage rings. previous work allows us maintain in-plane polarization stored deuteron beam few hundred seconds, perform first proof-of-principle experiment at Cooler Synchrotron (COSY) scan momenta near...
This paper presents the successful application of a phase-lock feedback system to maintain resonance condition radio frequency (rf) spin rotator (specifically, an rf Wien filter) with respect 120 kHz precession in Cooler Synchrotron (COSY) storage ring. Real-time monitoring and filter signal allows relative phase between two be stabilized at arbitrary setpoint. The compensates for deviations by adjusting and/or as needed. With this method, variation demand standard deviation...
This Letter reports the successful use of feedback from a spin polarization measurement to revolution frequency $0.97\text{ }\text{ }\mathrm{GeV}/c$ bunched and polarized deuteron beam in Cooler Synchrotron (COSY) storage ring order control both precession rate ($\ensuremath{\approx}121\text{ }\mathrm{kHz}$) phase horizontal component. Real time synchronization with radio (rf) solenoid made possible rotation out plane, yielding demonstration method manipulate polarization. In particular,...
The pp->pp phi reaction has been studied at the Cooler Synchrotron COSY-Juelich, using internal beam and ANKE facility. Total cross sections have determined three excess energies epsilon near production threshold. differential section closest to threshold epsilon=18.5 MeV exhibits a clear S-wave dominance as well noticeable effect due proton-proton final state interaction. Taken together with data for pp omega-production, significant enhancement of phi/omega ratio factor 8 is found compared...
This paper describes a time-marking system that enables measurement of the in-plane (horizontal) polarization 0.97-GeV/c deuteron beam circulating in Cooler Synchrotron (COSY) at Forschungszentrum J\"ulich. The clock time each polarimeter event is used to unfold 120-kHz spin precession and assign events bins according direction horizontal polarization. After accumulation for one or more seconds, down-up scattering asymmetry can be calculated matched sinusoidal function whose magnitude...
The stable spin direction of polarized particles in a storage ring was determined first experimentally, through an accurate measurement the tune and its response to longitudinal magnetic fields.
The production of $\ensuremath{\varphi}$ mesons in proton collisions with C, Cu, Ag, and Au targets has been studied via the $\ensuremath{\varphi}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$ decay at an incident beam energy 2.83 GeV using ANKE detector system COSY. For first time, momentum dependence nuclear transparency ratio, in-medium width, differential cross section for $\ensuremath{\varphi}$-meson forward angles have determined these over range 0.6--1.6 GeV/$c$. There are...
The deuteron tensor analysing power T20 of the d→p→He3η reaction has been measured at COSY-ANKE facility in small steps excess energy Q up to Q=11 MeV. Despite square production amplitude varying by over a factor five through this range, shows little dependence. This is evidence that final state interaction causing variation not influenced spin configuration entrance channel. weak angular dependence observed for provides useful insight into structure near threshold.
We report on measurements of the differential cross section $d\ensuremath{\sigma}/d\mathrm{\ensuremath{\Omega}}$ and first measurement analyzing power ${A}_{y}$ in $\mathrm{\ensuremath{\Delta}}(1232)$ excitation energy region reaction $pp\ensuremath{\rightarrow}{{pp}}_{s}{\ensuremath{\pi}}^{0}$ where ${{pp}}_{s}$ is a $^{1}S_{0}$ proton pair. The experiment has been performed with ANKE spectrometer at COSY-J\"ulich. data reveal peak dependence forward section, minimum zero degrees its...
The proposed method exploits charged particles confined as a storage ring beam (proton, deuteron, possibly $^3$He) to search for an intrinsic electric dipole moment (EDM) aligned along the particle spin axis. Statistical sensitivities could approach 10$^{-29}$ e$\cdot$cm. challenge will be reduce systematic errors similar levels. adjusted preserve polarisation, initially parallel velocity, times in excess of 15 minutes. Large radial fields, acting through EDM, rotate polarisation from...
The quasifree $pn\ensuremath{\rightarrow}d\ensuremath{\phi}$ reaction has been studied at the Cooler Synchrotron COSY---J\"ulich, using internal proton beam incident on a deuterium cluster-jet target and detecting fast deuteron in coincidence with ${K}^{+}{K}^{\ensuremath{-}}$ decay of $\ensuremath{\phi}$ meson. energy dependence total differential cross sections are extracted for excess energies up to 80 MeV by determining Fermi momentum neutron an event-by-event basis. Though these...
Differential and total cross sections for the pp -> ppK+K- reaction have been measured at a proton beam energy of 2.83 GeV using COSY-ANKE magnetic spectrometer. Detailed model descriptions fitted to variety one-dimensional distributions permit separation phi section from that non-phi production. The differential spectra show higher partial waves represent majority an excess 76 MeV, whose dependence would then seem require some s-wave phi-p enhancement near threshold. data can be described...
The pp -> ppK+K- reaction was measured below the phi threshold at a beam energy of 2.568 GeV using COSY-ANKE magnetic spectrometer. By assuming that four-body phase space is distorted only by product two-body final state interactions, fits to variety one-dimensional distributions permit evaluation differential and total cross sections. shapes in Kp Kpp invariant masses are reproduced if K-p interaction even stronger than found higher energy. cusp effect K+K- distribution K0K0bar much more...
The vector and tensor polarizations of a deuteron beam have been measured using elastic deuteron-carbon scattering at 75.6 MeV deuteron-proton 270 MeV. After acceleration to 1170 inside the COSY ring, deuterons were checked by studying variety nuclear reactions cluster target ANKE magnet spectrometer placed an internal position storage ring. All these measurements consistent with absence depolarization during provide number secondary standards that can be used in subsequent experiments facility.
The differential and total cross sections for the $\mathit{dp}\ensuremath{\rightarrow}^{3}\mathrm{He}\ensuremath{\eta}$ reaction have been measured at COSY--ANKE excess energies of 19.5, 39.4, 59.4 MeV over full angular range. results are in line with trends apparent from detailed near-threshold studies also largely agree those CELSIUS, though present data much better coverage near forward backward directions, thus allowing firmer conclusions to be drawn. While 19.5 can described terms $s$-...