Scientific Highlights Titel Datum Year Year201920182017201620152014201320122011201020092008 Month MonthJanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember 12 September 2018 Solid deuterium surface degradation at ultracold neutron sources Solid deuterium (sD2) is used as an efficient converter to produce ultracold neutrons (UCN). Itis known that the sD2 must be sufficiently cold, of high purity and mostly in its ortho-state in order to guarantee long lifetimes of UCN in the solid from which they are extracted into vacuum. 14 November 2017 Search for Axionlike Dark Matter through Nuclear Spin Precession in Electric and Magnetic Fields We report on a search for ultralow-mass axionlike dark matter by analyzing the ratio of the spin-precession frequencies of stored ultracold neutrons and 199Hg atoms for an axion-induced oscillating electric dipole moment of the neutron and an axion-wind spin-precession effect. No signal consistent with dark matter is observed for the axion mass range 10-24 ≤ ma ≤ 10-17eV. 19 June 2017 Comparison of ultracold neutron sources for fundamental physics measurements Ultracold neutrons (UCNs) are key for precision studies of fundamental parameters of the neutron and in searches for new charge-parity-violating processes or exotic interactions beyond the Standard Model of particle physics. The most prominent example is the search for a permanent electric-dipole moment of the neutron (nEDM). We have performed an experimental comparison of the leading UCN sources currently operating. 16 October 2015 Observation of Gravitationally Induced Vertical Striation of Polarized Ultracold Neutrons by Spin-Echo Spectroscopy We describe a spin-echo method for ultracold neutrons (UCNs) confined in a precession chamber and exposed to a |B0| = 1μT magnetic field. We have demonstrated that the analysis of UCN spin-echo resonance signals in combination with knowledge of the ambient magnetic field provides an excellent method by which to reconstruct the energy spectrum of a confined ensemble of neutrons. 18 May 2015 Constraining interactions mediated by axion-like particles with ultracold neutrons We report a new limit on a possible short range spin-dependent interaction from the precise measurement of the ratio of Larmor precession frequencies of stored ultracold neutrons and 199Hg atoms confined in the same volume. The measurement was performed in a ∼1μT vertical magnetic holding field with the apparatus searching for a permanent electric dipole moment of the neutron at the Paul Scherrer Institute. Sidebar Contact Dr. Bernhard Lauss Telephone: +41 56 310 46 47 E-mail: bernhard.lauss@psi.ch Secretary Anita Van Loon Telephone: +41 56 310 32 54 E-mail: anita.vanloon@psi.ch UCN Source User Facility Ultra Cold Neutrons Laboratory Laboratory for Particle Physics (LTP) Groups LTP Theory Group Crivellin Group High Energy Physics Group Muon Physics Group UCN Physics Group Electronics for Measuring Systems Group Detectors, Irradiation and Applied Particle Physics Group Vocational Training Homepage (in German) Facilities Proton Irraditation Facility (PIF) Ultra Cold Neutrons Source (UCN) Secondary Beamlines (SBL) Open Positions Job Opportunities at Research Division NUM. Particle Physics Events Overview Scientific Events at LTP.
12 September 2018 Solid deuterium surface degradation at ultracold neutron sources Solid deuterium (sD2) is used as an efficient converter to produce ultracold neutrons (UCN). Itis known that the sD2 must be sufficiently cold, of high purity and mostly in its ortho-state in order to guarantee long lifetimes of UCN in the solid from which they are extracted into vacuum.
14 November 2017 Search for Axionlike Dark Matter through Nuclear Spin Precession in Electric and Magnetic Fields We report on a search for ultralow-mass axionlike dark matter by analyzing the ratio of the spin-precession frequencies of stored ultracold neutrons and 199Hg atoms for an axion-induced oscillating electric dipole moment of the neutron and an axion-wind spin-precession effect. No signal consistent with dark matter is observed for the axion mass range 10-24 ≤ ma ≤ 10-17eV.
19 June 2017 Comparison of ultracold neutron sources for fundamental physics measurements Ultracold neutrons (UCNs) are key for precision studies of fundamental parameters of the neutron and in searches for new charge-parity-violating processes or exotic interactions beyond the Standard Model of particle physics. The most prominent example is the search for a permanent electric-dipole moment of the neutron (nEDM). We have performed an experimental comparison of the leading UCN sources currently operating.
16 October 2015 Observation of Gravitationally Induced Vertical Striation of Polarized Ultracold Neutrons by Spin-Echo Spectroscopy We describe a spin-echo method for ultracold neutrons (UCNs) confined in a precession chamber and exposed to a |B0| = 1μT magnetic field. We have demonstrated that the analysis of UCN spin-echo resonance signals in combination with knowledge of the ambient magnetic field provides an excellent method by which to reconstruct the energy spectrum of a confined ensemble of neutrons.
18 May 2015 Constraining interactions mediated by axion-like particles with ultracold neutrons We report a new limit on a possible short range spin-dependent interaction from the precise measurement of the ratio of Larmor precession frequencies of stored ultracold neutrons and 199Hg atoms confined in the same volume. The measurement was performed in a ∼1μT vertical magnetic holding field with the apparatus searching for a permanent electric dipole moment of the neutron at the Paul Scherrer Institute.
