Character of an 8⁻ isomer of ¹³⁰Ba

The static moments and isomer shift of the J(pi) = K-pi = 8(-) isomeric state in Ba-130(56) have been measured using the technique of collinear laser spectroscopy. The isomer has been found to have a magnetic dipole moment of -0.043(28) mu(N) and a static quadrupole moment of +2.77(30) b. These values have been used to assign the state as a two neutron (7)/(+)(2) [404] circle times N (9)/(-)(2) [514] configuration corresponding to a prolate shape. The half-life of the isomer has been confirmed is 9.54(14) ms, The change in the mean square charge radius was found to be (130m) - (130g-s) = -0.0473(30) fm(2). (C) 2002 Published by Elsevier Science B.V.