A5017683601- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Advanced NMR Techniques and Applications
- Nuclear reactor physics and engineering
- Advanced MRI Techniques and Applications
- Geophysical and Geoelectrical Methods
- Noncommutative and Quantum Gravity Theories
- Nuclear and radioactivity studies
- Superconducting Materials and Applications
- Nuclear Materials and Properties
- Radioactive Decay and Measurement Techniques
- Computational Physics and Python Applications
- Particle physics theoretical and experimental studies
- Geophysical Methods and Applications
- Cosmology and Gravitation Theories
- Advanced Frequency and Time Standards
Technical University of Munich
2010-2023
Excellence Cluster Universe
2011-2017
Munich University of Applied Sciences
1997
A versatile and portable magnetically shielded room with a field of (700 ± 200) pT within central volume 1 m × gradient less than 300 pT/m, achieved without any external stabilization or compensation, is described. This performance represents more hundredfold improvement the state art for two-layer magnetic shield provides an environment suitable next generation precision experiments in fundamental physics at low energies; particular, searches electric dipole moments systems tests...
A clock comparison experiment, analyzing the ratio of spin precession frequencies stored ultracold neutrons and 199Hg atoms, is reported. No daily variation this could be found, from which set an upper limit on Lorentz invariance violating cosmic anisotropy field b perpendicular < 2 x 10(-20) eV (95% C.L.). This first for free neutron. result also interpreted as a direct gravitational dipole moment neutron |gn| 0.3 eV/c2 m spin-dependent interaction with Sun. Analyzing Earth, based previous...
We performed ultracold neutron storage measurements to search for additional losses due (n) mirror-neutron (n′) oscillations as a function of an applied magnetic field B. In the presence mirror B′, would be maximal B≈B′. did not observe any indication nn′ and placed lower limit on oscillation time τnn′>12.0 s at 95% C.L. B′ between 0 12.5 μT.Received 26 May 2009DOI:https://doi.org/10.1103/PhysRevD.80.032003©2009 American Physical Society
The measurement of the neutron electric dipole moment (nEDM) constrains contribution CP-violating terms within both Standard Model and its extensions. experiment uses ultracold neutrons (UCN) stored in vacuum at room temperature. This technique provided last (and best) limit by RAL/Sussex/ILL collaboration 2006: dn < 2:9 × 10-26 e cm (90% C.L.). We aim to improve experimental sensitivity a factor 5 2-3 years, using an upgrade same apparatus. will take advantage increased density Paul...
We describe a new table-top electrostatic storage ring concept for 30 keV polarized ions with fixed spin orientation. The device will ultimately be capable of measuring magnetic fields resolution 10 −20 T sub-mHz bandwidth. With the possibility to store different kinds or ionic molecules and access prepare probe states systems using lasers SQUIDs, it can used search electric dipole moments (EDMs) electrons nucleons, as well axion-like particle dark matter photon matter. Its sensitivity...
I. Altarev(), S. Chesnevskaya(), W. Feldmeier(), P. Fierlinger(), A. Frei(), E. Gutsmiedl(), F. Kuchler(), Link(), T. Lins(), M. Marino(), Paul(), G. Petzoldt(), Pichlmaier(), R. Stoepler(), Stuiber(), B. Taubenheim() () Physikdepartment Technische Universitat Munchen and Excellence-Cluster ’Universe’ Munchen, Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II)
At Institut Laue-Langevin (ILL) and Paul Scherrer Institute (PSI), we have measured the losses depolarization probabilities of ultracold neutrons on various materials: (i) nickel-molybdenum alloys with weight percentages 82/18, 85/15, 88/12, 91/9, 94/6 natural nickel Ni100, (ii) nickel-vanadium NiV93/7, (iii) copper, (iv) deuterated polystyrene (dPS). For different samples, storage-time constants up to $\ensuremath{\sim}460\phantom{\rule{0.16em}{0ex}}\mathrm{s}$ were obtained at room...
Our recent neutron scattering measurements of phonons and other quasi-particle excitations in solid deuterium (sD2) the extraction density states for rotational transitions sD2 have led us to a new understanding production ultra-cold neutrons (UCN) sD2. The UCN rate reaches maximum at an equivalent temperature Tn=40 K flux with Maxwellian energy distribution. cross-section has been determined by using G1(E) combination incoherent approximation as well direct calibration our measured...
The dynamics of solid deuterium $({\text{sD}}_{2})$ is studied by means inelastic scattering (coherent and incoherent) thermal cold neutrons at different temperatures para-ortho ratios. In this paper, the results for generalized density states (GDOS) are presented discussed. measurements were performed neutron time-of-flight (TOF) instrument IN4 ILL Grenoble TOF TOFTOF FRM II Garching. GDOS comprises besides hcp phonon excitations ${\text{sD}}_{2}$ rotational transitions...
We have measured the acceleration of neutrons by material optical potential solid 2H2. Using a gravitational spectrometer, we find minimal kinetic energy Ec = (99+/-7) neV from superthermal ultracold neutron (UCN) source with 2H2 as an UCN converter. The result is in excellent agreement theoretical predictions, 106 neV.
Finite-element methods along with Monte Carlo simulations were used to design a magnetic storage device for ultracold neutrons (UCN) measure their lifetime. A setup was determined which should make it possible confine UCN negligible losses and detect the protons emerging from β-decay high efficiency: stacked superconducting solenoids create field, an electrostatic extraction field inside volume assures proton collection efficiency. Alongside optimization of design, properties trap...
A new measurement of the neutron EDM, using Ramsey's method separated oscillatory fields, is in preparation at high intensity source ultra-cold neutrons (UCN) Paul Scherrer Institute, Villigen, Switzerland (PSI). The existence a non-zero nEDM would violate both parity and time reversal symmetry and, given CPT theorem, might lead to discovery CP violating mechanisms. Already current upper limit for (|d_n|<2.9E-26 e.cm) constrains some extensions Standard Model. experiment aims two orders...
The nEDM experiment hosted at the Paul Scherrer Institute is flagship project new ultracold neutron facility.Estimations of systematic effects for determination electric dipole moment play an important role in this project.Experimental studies are supported by Monte Carlo simulations using MCUCN code.Here we briefly present first results on experimental benchmark model, and evaluation storage time dependence centre mass UCN precession chamber.Such calculations will serve as consistency tests...