Structure of 0(+) excitations in the mass A approximate to 100 region: 0(2)(+) bands in Sr-98 and Zr-100

0(2)(+) bands in Sr-98 and Zr-100, populated in spontaneous fission of Cm-248 and Cf-252, have been studied using the Eurogam2 and Gammasphere arrays. Phenomenological classification of excited 0(+) levels in even-even nuclei of the A approximate to 100 region into four categories is presented and an interpretation for each category is proposed. Highly deformed 0(1)(+) ground states and low-energy 0(2)(+) levels in both nuclei are probably due to the 2p-2h excitation of two neutrons from the 9/2(+)[404] extruder to the low-Omega prolate and the 11/2(-)[505] oblate orbitals originating from the h(11/2) shell, respectively. Candidates for 0(+), beta vibrational states in A approximate to 100 region are suggested at N > 60.