192 research outputs found
Search for Cosmic Axions using an Optical Interferometer
A high finesse optical cavity can be used to search for cosmic axions in the
mass range 10^{-6}< m_a <10^{-4} eV. Either a two-arm or a single-arm cavity is
suitable and in either case the signal as resonant sidebands imposed on the
carrier. Assuming for the local axion density the usual figure of 500 MeV/cm^3
[8], the KSVZ axion line [4] g/m_a = 0.4 Gev^{-2}, can be reached over the full
mass range in a one year search.Comment: 4 pages, 2 figur
Nuclear Magnetic Resonance and Hyperfine Structure
Contains reports on three research projects
The response of laser interferometers to a gravitational wave
Laser interferometer detectors are now widely used in an attempt to detect
gravitational waves (gw). The interaction of the gw with the light circulating
in the interferometer is usually explained in terms of the motion of the "free"
mirrors that form the interferometer arms. It is however instructive to show
that the same result can be obtained by simply calculating the propagation of
an electromagnetic plane wave between "free mirrors" in the curved space-time
induced by the gw. One finds that the plane wave acquires frequency modulation
sidebands at the gw frequency, as would be expected from the absorption and
emission of gravitons from and to the gw. Such sidebands are completely
equivalent to the time-dependent phase shift imposed on the plane wave, that
follows from the conventional calculation
Integrating virtual reality and gis tools for geological mapping, data collection and analysis: An example from the metaxa mine, santorini (Greece)
In the present work we highlight the effectiveness of integrating different techniques and tools for better surveying, mapping and collecting data in volcanic areas. We use an Immersive Virtual Reality (IVR) approach for data collection, integrated with Geographic Information System (GIS) analysis in a well-known volcanological site in Santorini (Metaxa mine), a site where volcanic processes influenced the island’s industrial development, especially with regard to pumice mining. Specifically, we have focused on: (i) three-dimensional (3D) high-resolution IVR scenario building, based on Structure from Motion photogrammetry (SfM) modeling; (ii) subsequent geological survey, mapping and data collection using IVR; (iii) data analysis, e.g., calculation of extracted volumes, as well as production of new maps in a GIS environment using input data directly from the IVR survey; and finally, (iv) presentation of new outcomes that highlight the importance of the Metaxa Mine as a key geological and volcanological geosite
Nuclear Magnetic Resonance and Hyperfine Structure
Contains research objectives and reports on ten research projects
High resolution study of the Lambda p final state interaction in the reaction p + p -> K+ + (Lambda p)
The reaction pp -> K+ + (Lambda p) was measured at Tp=1.953 GeV and Theta = 0
deg with a high missing mass resolution in order to study the Lambda p final
state interaction. The large final state enhancement near the Lambda p
threshold can be described using the standard Jost-function approach. The
singlet and triplet scattering lengths and effective ranges are deduced by
fitting simultaneously the Lambda p invariant mass spectrum and the total cross
section data of the free Lambda p scattering.Comment: submitted to Physics Letters B, 10 pages, 3 figure
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