Abstract
Low-lying states of 93 Nb have been studied by the Coulomb excitation with oxygen ions. Cross sections were measured for six levels at 774 keV (7/2 + ), 809 keV (5/2 + ), 950 keV (13/2 + ), 979 keV (11/2 + ), 1083 keV (9/2 ′+ ) and 1297 keV. The B (E2) values obtained from the gamma-ray singles spectra are 188 ±10 (9/2 + →7/2 + ), 153 ±8 (9/2 + →5/2 + ′ ), 236 ±13 (9/2 + →13/2 + ), 186 ±10 (9/2 + →11/2 + ), 30.6 ±2.1 (9/2 + →9/2 + ′ ) and 40.1 ±4.0 (9/2 + →the 1297 keV level) in the unit of e 2 ·fm 4 , where 9/2 + denotes the ground state. Gamma-ray angular correlations were also measured and the spin and parity has been assigned as 9/2 + for the 1297 keV level. In addition, the excitation cross section of the first 2 + state for 92 Zr was measured for comparison with the excited states of 93 Nb. The deduced B (E2) value is 796 ±60 (0 + →2 + ). Level properties are discussed and compared with the unified model and the quasi-particle shell model.
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