The magnetic moment of the 10+ isomer in140Ce andE1 transitions inN=82 isotones caused by outer subshell configurations

Abstract

Using the reaction 13SBa(c~,2n)14~ the magnetic moment of the 10~ isomer at Ex = 3714.7 keV in the N = 82 nucleus 14~ has been determined by means of the TDPAD method to # = + 10.3(4)#N-Measured g-factors in ~4~ are compared to calculations within the shell model with configuration mixing. For the 10( isomer in 14~ the four proton configuration ~(lg2/2,2d2/2 ) has been found to be dominant. From the g-factor measurement strong contributions of multiparticle excitations to the 7r2d3/2, 7r3sl/2 or rclh~l/2 shells and admixtures of neutron excitations to the wave function of the 10~ state could be excluded. The strong E1 y-branch of the deexcitation of the 10( isomer in ~4~ can be explained by means of small admixtures of configurations which contain the outer subshell excitations 7r2fw 2 and n 1 h9/2. On this basis E 1 transitions experimentally observed in the N =82 nuclei ~4~ ~41Pr and ~45Eu may be understood.