N R C FIN 82296 WBTICE PQRTlbNS OF THIS REPORT ARE ILlE64BLE. It has been reproduced from the hest availahle copf to permit the broadest possible avrllability.

Coefficients of absorption of visible radiation are determined for sea ice and snow as a function of porosity of the medium and wave-length of energy refracted into it. A comparison is made between the values derived and those obtained by other investigators under similar snow conditions. A difference in results suggests a significant rôle of crystal size and orientation in the absorption properties of sea ice and snow.

Searches for solar axions began a decade ago when the US Brookhaven Laboratory first pointed an axion telescope at the Suna highly useful source of weakly interacting particles for fundamental research, as the solar neutrino anomaly amply demonstrates. Axions would be produced in the Sun through the scattering of photons from electric charges -the Primakoff effect -and their numbers could equal those of solar neutrinos. The idea behind the Brookhaven experiment, first proposed by Pierre Sikivie, was to put the Primakoff effect to work in reverse, using a magnetic field to catalyse the conversion of solar axions back into X-ray photons of a few kilo-electronvolts.

No abstract

No abstract