| Popis: |
The idea of RAMHAND-type experiments proposed by Dagkesamanskii and Zheleznykh is similar to that of RAMAND-type experiments. Both types are based on Askaryan's effect, described by Askaryan in the beginning of the 1960s. The main difference between them is that different targets are used. RAMAND-type experiments use the massif of Antarctic ice, whereas the other experiments use the surface of the Moon. In both cases radio antennas are used as the detectors of the Cherenkov radio pulses arising in relatively dense dielectrics. Several RAMHAND-type experiments (Parks, Glue and Kalyazin experiments) carried out at frequencies around 1.4 GHz and higher had placed only an upper limit to the isotropic flux of EHE-neutrinos ( E ν ∼ 10 20 – 21 eV ) . Some advantages of observations at lower frequencies (especially for the detection of the extremely high energy neutrinos, with E ν > 10 22 eV ) were considered by several teams during the last years. A different strategy was suggested by Australian scientists, who suggested a technique of estimating the anisotropic EHE-neutrinos fluxes only from the near AGNs and their vicinities. Impressive prospects for the investigation of the EHE-neutrinos fluxes will be opened with the construction of new generation of giant radio telescopes, like LOFAR, FAST, SKA and other multi-element and multi-beam systems. Radio antennas placed on board of the lunar satellite (LORD—Lunar Orbital Radio Detector project) will provide scientists with another interesting possibility of studying neutrino physics, high-energy astrophysics and cosmology. |
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