OBSERVATION OF A STRONG CORRELATION BETWEEN G(2(-VIB) AND G(2(+)ROT) IN STRONGLY DEFORMED-NUCLEI()GAMMA)

The E2/M1 multipole mixing parameters of cascade transitions in gamma- vibrational bands of Gd-154, Er-166 and Er-168 have been determined by gamma-gamma directional correlation measurements as: delta(Gd-154(3(g amma)(+) --> 2(gamma)(+))) = - 4.3(+2.1)(-9.4) delta(Er-166(5(gamma)() --> 4(gamma)(+))) = + 1.94(-0.21)(+0.23) and delta(Er-168(3(gamma)() --> 2(gamma)(+))) = + 1.42(-0.04)(+0.04) (with conversion data [15] taken into account) These data were used to derive g(2(+) gamma vib) - g(2(+) rot). The results, together with g-factors derived from direct measurements by IPAC and Mossbuer spectroscopy [10] or by use of tran sient fields [9, 31] exhibit a strong correlation between both g-facto rs, i.e. if g(2(+) rot) is large g(2(+) gamma vib) is small and vice v ersa. The most direct and most simple interpretation is the assumption of a more or less different density distribution of protons and neutr ons in the nuclei.