F. Rathmann
A5068581821- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Atomic and Molecular Physics
- Advanced NMR Techniques and Applications
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Dark Matter and Cosmic Phenomena
- Quantum, superfluid, helium dynamics
- Superconducting Materials and Applications
- High-Energy Particle Collisions Research
- Advanced Chemical Physics Studies
- Scientific Research and Discoveries
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Data Storage Technologies
- Magnetic confinement fusion research
- Neutrino Physics Research
- Electron and X-Ray Spectroscopy Techniques
- Photocathodes and Microchannel Plates
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- Geophysical and Geoelectrical Methods
- Scientific Computing and Data Management
Forschungszentrum Jülich
2016-2025
Brookhaven National Laboratory
2024-2025
RWTH Aachen University
2023
GSI Helmholtz Centre for Heavy Ion Research
2023
Stadtwerke Jülich (Germany)
2007-2022
Joint Institute for Nuclear Research
2009-2019
Max Planck Institute for Nuclear Physics
1992-2019
Landau Institute for Theoretical Physics
2019
Moscow Institute of Physics and Technology
2019
Belarusian State University
2019
A new experiment is described to detect a permanent electric dipole moment of the proton with sensitivity $10^{-29}e\cdot$cm by using polarized "magic" momentum $0.7$~GeV/c protons in an all-electric storage ring. Systematic errors relevant are discussed and techniques address them presented. The measurement sensitive physics beyond Standard Model at scale 3000~TeV.
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 proton and deuteron analyzing powers ten of the possible 12 spin correlation coefficients have been measured for $p+d$ elastic scattering at bombarding energies 135 200 MeV. results are compared with Faddeev calculations using two different $\mathit{NN}$ potentials. qualitative features extensive data set on dependence in over a wide range angles presented here remarkably well explained by two-nucleon force predictions without inclusion three-nucleon force. remaining discrepancies are,...
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...
An inductive compact beam position monitor based on a segmented toroidal coil surrounding the charged particle has been investigated. It makes use of induced voltages in windings instead charge imbalance capacitor plates popular monitors. We theoretically investigate response coils to bunched lumped-element model and compare it measurements laboratory storage ring COSY terms displacement. As frequency coils, we find resonant behavior, which may be exploited further increase sensitivity...
A feasibility test of a new method to polarize beams strongly interacting charged particles circulating in storage ring is described. The stored particles, here protons, pass through polarized hydrogen gas target (thickness 6\ifmmode\times\else\texttimes\fi{}${10}^{13}$ H/${\mathrm{cm}}^{2}$) the some ${10}^{10}$ times and become partially because one spin state attenuated faster than other. polarization buildup clearly demonstrated present experiment.
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,...
This letter of intent proposes an experiment to search for electric dipole moment the muon based on frozen-spin technique. We intend exploit high field, $E=1{\rm GV/m}$, experienced in rest frame with a momentum $p=125 {\rm MeV/}c$ when passing through large magnetic field $|\vec{B}|=3{\rm T}$. Current fluxes at $μ$E1 beam line permit improved sensitivity $σ(d_μ)\leq 6\times10^{-23}e{\rm cm}$, about three orders magnitude more than current upper limit $|d_μ|\leq1.8\times10^{-19}e{\rm...
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 Standard Model (SM) of Particle Physics is not capable accounting for the apparent matter-antimatter asymmetry our universe. beyond SM required and searched by (i) employing highest energies (e.g., at LHC), (ii) striving ultimate precision sensitivity in search electric dipole moments (EDMs)). Permanent EDMs particles violate both time reversal (T) parity (P) invariance, are via CPT-theorem also CP-violating. Finding an EDM would be a strong indication physics SM, reducing upper limits...
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...
In a kinematically complete experiment we have measured the two analyzing powers and five spin correlation coefficients of reaction $\stackrel{\ensuremath{\rightarrow}}{p}\stackrel{\ensuremath{\rightarrow}}{p}\ensuremath{\rightarrow}\mathrm{pp}{\ensuremath{\pi}}^{0}$ as function all parameters three-body final state for bombarding energies between 325 400 MeV. The data are in disagreement with theoretical predictions available at this time. Below MeV, fewer than dozen complex partial-wave...
Polarized antiprotons can be produced in a storage ring by spin-dependent interaction purely electron-polarized hydrogen gas target. The polarizing process is based on spin transfer from the polarized electrons of target atoms to orbiting antiprotons. After filtering for about two beam lifetimes at energies $T\ensuremath{\approx}40--170\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}$ using dedicated large acceptance ring, antiproton polarization would reach $P=0.2--0.4$. open new and unique...
The Lamb-shift polarimeter described here enables the polarization of a beam hydrogen (deuterium) atoms, or slow proton (deuteron) beam, to be measured with an absolute precision better than 1% within few seconds. measures intensity ratios Lyman-α transitions after Stark quenching metastable hyperfine substates that were selected in spin filter. For purpose atoms are ionized Glavish-type ionizer. By charge exchange protons (deuterons) cesium vapor, 2S state produced. 3×1016 atoms/s, ∼3×106...