1743 CAST Meetings false [["1", "Abstract"], ["0", "Abstract"], ["minutes", "Minutes"], ["notes", "Notes"], ["paper", "Paper"], ["poster", "Poster"], ["slides", "Slides"], ["summary", "Summary"]] University of Oxford (GB) alan.barr@cern.ch 19868 zioutas@physics.upatras.gr False University of Patras

University of Patras Rio, 26500 Patras Greece

Conference Center 2006-05-18T09:00:00 2006-05-19T20:00:00 2006-04-08T22:20:51 2011-09-13T20:02:40 Europe/Zurich 6 false [["1", "Abstract"], ["0", "Abstract"], ["minutes", "Minutes"], ["notes", "Notes"], ["paper", "Paper"], ["poster", "Poster"], ["slides", "Slides"], ["summary", "Summary"]] University of Washington Association zurkat@u.washington.edu University of Patras

University of Patras Rio, 26500 Patras Greece

Conference Center 2006-05-18T14:50:00 2006-05-18T15:30:00 00:40 Kathryn Zurek University of Washington Association zurkat@u.washington.edu 0 We consider non-standard axion cosmologies in theories which exhibit a phase transition below the QCD scale. In these theories, the cosmological upper bound on the axion decay constant is evaded. There also result from this theory heavy (eV mass or higher) axion-like pseudoscalars which may be detectable. We discuss implication for current axion detection experiments. 1 Due to their outstanding property to be storable and hence observable for long periods of time (several hundreds of seconds) in suitable material or magnetic traps, ultra-cold neutrons (UCN) with energies around 100 neV are an unique tool to study fundamental properties of the free neutron. A brief introduction to the Institute Laue-Langevin (ILL) in Grenoble, France, which is a world leader in academic research with neutrons will be given. The scope of fundamental physics studies with neutrons is outlined. The main instruments provided for such studies are described and some past and current flagship experiments with ultra-cold neutrons (UCN) in this field (lifetime and quantum states) are highlighted. The properties and the production of UCN are described in detail. For particles to have electric dipole moments, the forces concerned in their structure must be asymmetric with regard to space-parity (P) and time reversal (T). P violation is a well-known intrinsic feature of the weak interaction which is responsible for the beta-decay of the free neutron. T violation turns out to be necessary to explain the survival of matter at the expense of antimatter after the Big Bang. By searching for an EDM of the free neutron hypothetical new channels of T-violation can be investigated. In this talk two EDM projects will be presented in detail, an experiment at room temperature that has recently been completed and a cryogenic experiment that is currently being constructed. The experiments are based on a precision measurement of the Larmor precession frequency of polarised ultracold neutrons stored in a cell in a magnetic field. An EDM would reveal itself by a response of the Larmor precession frequency of the neutron to an electric field applied over the storage volume. The room temperature experiment has been carefully analysed. An upper limit on the absolute value of the neutron EDM of |dn| < 3.0x10-26 e∙cm (90% CL) has been found (paper submitted to PRL, preprint hep-ex/0602020). The two experiments at the ILL will be compared to competing EDM projects worldwide. 0 In addition to the very well-known photon coupling, the coupling of axions to nucleons provides several interesting and experimentally accessible production channels. Such axions can be classified as “high-energy” with respect to the much lower energy relic and Primakoff axions, with typical kinetic energies in the tens of MeV region. For a helioscope experiment that relies on the axion-photon conversion, the high kinetic energy of these nuclear axions improves the coherence condition along the magnetic field length, thereby improving the conversion probability compared to that of Primakoff axions for a given axion mass. During the 2004 Phase 1 run, the CAST calorimeter conducted the first helioscope search for high-energy axions. I will introduce the production mechanisms of high-energy axions that are of interest in general and go through the modified axion-photon conversion probability and expected signal. I will then describe the CAST calorimeter and the results obtained. paper poster 2013-06-19 2013-06-20