CHANGE OF SHAPE IN THE YRAST SEQUENCE IN CR-50

In shell model calculations for the yrast even-spin states of Cr-50, t he static quadrupole moments of the low-spin states 2(1)(+), 4(1)(+), 6(1)(+), and 8(1)(+) are negative but those of the high-spin states 10 (1)(+), 12(1)(+), and 14(1)(+) are positive. Yrast states with even sp ins greater than the single j shell limit, J(max)=14, again have negat ive quadrupole moments.