Low-spin isomer ofBa127

High spin level structure in127Ba produced by the118Sn(12C, 3n) reaction

“…Two isomers were found and the high-spin isomer is reported to lie approximately 200 keV below the low-spin one. The main results of two recent studies [6,7] on the ~27Ba decay are in good agreement: 7-rays of 66.0, 114.8 and 180.8 keV are associated with the (13.0_+0.5) rain. decay of the l ZTBa low-spin isomer.…”

“…Apparently there is no transition with an energy greater than 60 keV and sufficiently strong intensity to depopulate this 9/2-state. After bombardment of the 118Sn target by carbon beam, we have essentially observed gammas of 66.0, 115.1 and 180.8 keV with intensities and half-life previously reported [6,7] in the decay of 127Ba and actually we have no additional informations about the two isomers already identified [5]. So we don't know if the 9/2-state is the ground state or an isomeric state.…”

New isomers in neutron-deficient isotopes of124Cs and127Ba

“…Two different values were proposed by d'AURIA et al [4], one associated with a highspin state in 127Ba (TI/2 = iO min) and another one corresponding to a low-spin state in the same isotope (TI/2 = 18 minutes). We have not observed these two half-lives but only one, in agreement with the results given by Pathak and Preiss [5] (TI/2 = 13.O • 0.5 minutes) in the case of 127Ba fed from its 127La precursor. Moreover, one low-energy y-ray at 56.2 keV associated with Ba X-rays has been identified with a new half-life of 1.9• seconds ( fig.…”

On-line perturbed angular correlation studies with the short lived 127Cs probe

“…Since Rb is isovalent to Cs, we can assume that V (CsGa)/ V (RbGa) (1 À c I (Cs))/(1 À c I (Rb)). We thus obtain |Q( 127 Cs)| 0.58 (12)b. The magnitudes of both values found for Q, which were obtained in two independent ways, are in excellent agreement.…”