P. Campbell et al., ISOTOPE SHIFTS OF THE NEUTRON-DEFICIENT BISMUTH ISOTOPES - CHARGE RADII SYSTEMATICS ACROSS THE Z=82 SHELL CLOSURE, Physics letters. Section B, 346(1-2), 1995, pp. 21-26
The isotope shifts (IS) of Bi-202,Bi-203,Bi-204 have been measured on
the 306.7 nm line using an extremely sensitive gas cell technique of l
aser spectroscopy. A King plot analysis of this data with other IS mea
surements in neighbouring isotope chains reveals that the known scalin
g behaviour of relative changes in mean square nuclear charge radius i
s only strictly ovserved above the Z = 82 shell closure.