Solar receiver absorber and solar receiver comprising at least one such absorber

An absorber for a solar power tower solar receiver comprising:

• an enclosure in which at least one panel is configured to be illuminated;
• a core made of at least one material with heat conductivity at least partially encompassed by the enclosure and at least one tube passing through the core and extending substantially in a parallel direction with respect to the panel configured to be illuminated;
• the tube configured for circulation of a fluid to be heated, wherein the at least one material of the core has a heat conductivity coefficient greater than or equal to 100 Wm−1K−1 at ambient temperature.