E2-TRANSITION AND Q(J-MASS RUTHENIUM NUCLEI() SYSTEMATICS OF EVEN)

The yrast spectra with J(max)pi = 10+, B(E2) transition probabilities and Q(J+) values are calculated for even-even ruthenium isotopes by ca rrying out variation after projection (VAP) calculations in conjunctio n with the Hartree-Fock-Bagoliubov (HFB) ansatz employing a pairing-pl us-quadrupole-quadrupole effective interaction operating in a reasonab ly large valence space outside the 76Sr core. Our calculations describ e the shape changes as a function of mass number for ruthenium isotope s and also reveal that both the HFB technique as well as the quadrupol e-plus-pairing-quadrupole model of the two-body interaction are fairly reliable in this mass region.