Anastasio Fratangelo
A5009726160- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Dark Matter and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear Physics and Applications
- NMR spectroscopy and applications
- Advanced MRI Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Advanced NMR Techniques and Applications
- Cosmology and Gravitation Theories
University of Bern
2020-2024
We present the result of an experiment to measure electric dipole moment (EDM) neutron at Paul Scherrer Institute using Ramsey's method separated oscillating magnetic fields with ultracold neutrons (UCN). Our measurement stands in long history EDM experiments probing physics violating time reversal invariance. The salient features this were use a Hg-199 co-magnetometer and array optically pumped cesium vapor magnetometers cancel correct for field changes. statistical analysis was performed...
We present the design of a next-generation experiment, n2EDM, currently under construction at ultracold neutron source Paul Scherrer Institute (PSI) with aim carrying out high-precision search for an electric dipole moment neutron. The project builds on experience gained previous apparatus operated PSI until 2017, and is expected to deliver order magnitude better sensitivity provision further substantial improvements. An overview experimental method setup given, requirements are derived, its...
We report on a search for dark matter axionlike particles (ALPs) using Ramsey-type apparatus cold neutrons. A hypothetical ALP-gluon coupling would manifest in neutron electric dipole moment signal oscillating time. Twenty-four hours of data have been analyzed frequency range from 23 μHz to 1 kHz, and no significant has found. The usage present dark-matter models allows one constrain the ALPs gluons mass 10^{-19} 4×10^{-12} eV. best limit C_{G}/f_{a}m_{a}=2.7×10^{13} GeV^{-2} (95% C.L.) is...
Abstract High-precision searches for an electric dipole moment of the neutron (nEDM) require stable and uniform magnetic field environments. We present recent achievements degaussing equilibrating magnetically shielded room (MSR) n2EDM experiment at Paul Scherrer Institute. final configuration that will be used after numerous studies. The optimized procedure results in a residual has been reduced by factor two. ultra-low is achieved with full magnetic-field-coil system, large vacuum vessel...
We present the magnetically shielded room (MSR) for n2EDM experiment at Paul Scherrer Institute which features an interior cubic volume with each side of length 2.92m, thus providing accessible space 25m3. The MSR has 87 openings up to 220mm diameter operate experimental apparatus inside, and intermediate between layers sensitive signal processing electronics. characterization measurements show a remanent magnetic field in central 1m3 below 100pT, 600pT entire inner volume, 4\,cm walls....
We present a novel Active Magnetic Shield (AMS), designed and implemented for the n2EDM experiment at Paul Scherrer Institute. The will perform high-sensitivity search electric dipole moment of neutron. Magnetic-field stability control is key importance n2EDM. A large, cubic, 5 m side length, magnetically shielded room (MSR) provides passive, quasi-static shielding-factor about 105 its inner sensitive volume. AMS consists system eight complex, feedback-controlled compensation coils...
Magnetic Johnson-Nyquist noise (JNN) originating from metal electrodes, used to create a static electric field in neutron electric-dipole-moment (nEDM) experiments, may limit the sensitivity of measurements. We present here first dedicated study on JNN applied large-scale long-measurement-time experiment with implementation co-magnetometry. In this study, we derive surface- and volume-averaged root-mean-square normal amplitudes at certain frequency bandwidth for cylindrical geometry....
The novel technique of frequency-offset separated oscillatory fields (FOSOF) has been originally proposed as a modification to Ramsey's method fields. It recently employed in precision measurements with atomic beams since it allows for an alternative approach determine absolute resonance frequencies. We present results from systematic investigation the FOSOF adapted beam cold neutrons.
The novel technique of frequency-offset separated oscillatory fields (FOSOF) was originally proposed as a modification to Ramsey's method fields. It has recently been employed in precision measurements with atomic beams since it allows for an alternative approach determine absolute resonance frequencies. We present results from systematic investigation the FOSOF adapted beam cold neutrons.
We present an apparatus that applies Ramsey's method of separated oscillatory fields to proton spins in water molecules. The setup consists a circuit, spin polarizer, magnetically shielded interaction region with various radio frequency elements, and nuclear magnetic resonance system measure the polarization. show this can be used for Rabi measurements investigate pseudomagnetic field effects Ramsey-type precision sensitivity below 100 pT.
We present an apparatus that applies Ramsey's method of separated oscillatory fields to proton spins in water molecules. The setup consists a circuit, spin polarizer, magnetically shielded interaction region with various radio frequency elements, and nuclear magnetic resonance system measure the polarization. show this can be used for Rabi measurements investigate pseudomagnetic field effects Ramsey-type precision sensitivity below 100 pT.
We investigate the response of a Ramsey-type experiment on an additional oscillating magnetic field. This superimposed field is oriented in same direction as static main and causes modulation original Larmor spin precession frequency. The observable magnitude this reduces at higher frequencies It disappears completely if interaction time particles matches oscillation period, which we call resonant cancellation. present analytical approach that describes effect compare it to measurement using...
We investigate the response of a Ramsey-type experiment on an additional oscillating magnetic field. This superimposed field is oriented in same direction as static main and causes modulation original Larmor spin precession frequency. The observable magnitude this decreases at higher frequencies It disappears completely if interaction time particles matches oscillation period, which we call resonant cancellation. present analytical approach that describes effect compare it to measurement...
We report on a search for dark matter axion-like particles (ALPs) using Ramsey-type apparatus cold neutrons. A hypothetical ALP-gluon-coupling would manifest in neutron electric dipole moment signal oscillating time. Twenty-four hours of data have been analyzed frequency range from 23 $μ$Hz to 1 kHz, and no significant has found. The usage present dark-matter models allows constrain the coupling ALPs gluons mass $10^{-19}$ $4 \times 10^{-12}$ eV. best limit $C_G$/$f_a m_a = 2.7 10^{13}$...