NEUTRINO2010, XXIV International Conference on Neutrino Physics and Astrophysics, Athens, GREECE

Detection of solar neutrinos by coherent scattering on high Debye temperature monocrystals

Not scheduled

Aithousa Mitropoulos

Speaker

Dr ILIE CRUCERU (Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, IFIN-HH Bucharest ROMANIA)

Description

The possibility of detecting solar neutrinos by coherent scattering on high Debye temperature monocrystals such as sapphire is presented and discussed. Preliminary experimental results estimate that 0-430 keV solar neutrinos flux produces observable torque for a high-sensitive torsion balance. Our experiment gives a result for the diurnal force as predicted by Weber's theory of enhanced solar neutrinos coherent scattering.

Summary

We prepared a robust, simple and dedicated torsion balance, designed to evidence interaction neutrinos with a force sensitivity varying between 10-6 and 10-8 dyne, i.e. comparable with those reported by Weber.The torsion balance uses two alternatives for the pendulum assembly with wolfram and molibdenum gold plated annealed wires having diameters of (25-50)micrometers and the length between (27-100)cm.The Sun as a well-defined neutrino source also provides extremely important opportunities to investigate nontrivial neutrino properties such as nonzero mass and mixing, because of the wide range of matter density and the great distance from the Sun to the Earth.Observation of solar neutrinos directly address the theory of stelar structure and evolution , which is the bases of the standard model (SSM).
Experimentally we used sapphire and lead. A diurnal effect is predicted as the position of the Sun changes relative to the balance. We have been observing the diurnal efect when the Sun is in direction of the line normal to the diameter joing the two masses.
The results are consist with Weber's hypothesis of very large cross sections for neutrinos incident on stiff perfect crystals.