Quadrupole-quadrupole interaction calculations which include N=2 mixing

We carry out a study of the study of the Q.Q interaction in a model space which consists of several nucleons in an open shell and all <2(h)over bar omega> excitations. This interaction is -t(chi(0)/2)Q.Q, where for t = 1 we get the ''accepted strength.'' In the 0p space, the spectrum would scale with t. In this space, the 2(1)(+) and 2(2)(+) states of Be-10 are degenerate, as are the [330] and [411] sets of J = 0(+), 1(+), and 2(+) triplets. When <2(h)over bar omega> admixtures are included, the degeneracies are removed. For t greater than or equal to 1.8 we have new ground state and a new 2: state. These are states in which two particles are excited from the 0p to the Is-Od shell. There is no mixing of these two-particle-two-hole (2p-2h) states with the other states. For these 2p-2h states the occupancy for 0s, 0p, 1s-0d, and 1p-0f are 4, 4, 2, and 0 respectively.