Torsten Soldner

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We have observed depolarization effects when high intensity cold neutron beams are incident on alkali-metal spin-exchange-polarized 3He cells used as neutron spin filters. This was first observed as a reduction of the maximum attainable 3He polarization and was attributed to a decrease of alkali-metal polarization, which led us to directly measure(More)
Electric field gradients (EFG) at Hg were determined in mercury mercaptides H g ( S ( C H 2 ) i C H 3 ) 2 experimentally for i e {0, 1, 2} using time differential perturbed angular correlation and theoretically for i e {0, 1} with the full potential linearized augmented plane wave code WIEN95. Due to the large unit cells and small hydrogen atoms not full(More)
T. Soldner1, L. Beck 2, C. Plonka3, K. Schreckenbach3 , O. Zimmer4 1Institut Laue Langevin, BP156, F-38042 Grenoble Cedex 9, France, E-mail: soldner@ill.fr 2Beschleunigerlabor von LMU und TU München, Am Coulombwall, D-85747 Garching, Germany 3Physik-Department E21, TU München, James-Franck-Str., D-85747 Garching, Germany 4Physik-Department E18, TU München,(More)
We present a first experimental demonstration of a new method to extract a wellcollimated beam of ultra-cold neutrons (UCN) from a storage vessel. Neutrons with too large divergence are not removed from the beam by an absorbing collimation, but a diffuse or semidiffuse channel with high Fermi potential reflects them back into the vessel. This avoids(More)
This article describes measurements of angular-correlation coefficients in the decay of free neutrons with the superconducting spectrometer PERKEO II. A method for measuring the β-asymmetry coefficient A is presented, as well as a new method for determining the neutrino-asymmetry coefficient B, which allows a value for the proton-asymmetry coefficient C to(More)
The electric dipole moment of the neutron (nEDM) is a very sensitive probe for CP violation beyond the Standard Model of particle physics [1,2]. The most precise experiments today use Ramsey’s resonance method and ultra-cold neutrons (UCNs) [3,4]. Further progress is presently limited by systematics [5] and the low density of UCNs available. Here we discuss(More)
The combination of the intense cold neutron beam available at the PF1b beam position of the Institute Laue-Langevin (ILL) in Grenoble, together with the high detection efficiency of a large array of high purity Ge detectors (HPGe) has offered a unique opportunity for a set of experiments devoted to nuclear spectroscopy on stable isotopes as well as on(More)
A new measurement of the neutrino asymmetry parameter B in neutron decay, the angular correlation between neutron spin and antineutrino momentum, is presented. The result, B=0.9802(50), confirms earlier measurements but features considerably smaller corrections. It agrees with the standard model expectation and permits updated tests on "new physics" in(More)
We present the status of the development of a dedicated high density ultra-cold neutron (UCN) source dedicated to the gravitational spectrometer GRANIT. The source employs superthermal conversion of cold neutrons to UCN in superfluid helium. Tests have shown that UCN produced inside the liquid can be extracted into vacuum. Furthermore a dedicated neutron(More)
CP violation is implemented in the Standard Model (SM) of particle physics via a non-trivial phase in the Cabbibo-Kobayashi-Maskava matrix 1. Dedicated experiments and facilities have been built to check the predictions of the SM for CP violation, e.g. in the Kaon or the B meson sectors. Up to now, no significant deviations have been found. However, the CP(More)