Swedish Nobel Prize winner dies

Kai Siegbahn, who won the Nobel Prize for physics in 1981, has died at the age of 89, the Swedish TT news agency reported on Saturday.

Siegbahn, whose father Karl also won the physics prize for his work on X-rays in 1924, was honoured for his contribution to the development of high resolution electron spectroscopy.

He was awarded half the prize, with other half being shared by Americans Nicolaas Bloembergen and Arthur Schawlow.

TT said Siegbahn, who headed the physics department at the University of Uppsala and was married with three children, died on July 20.