Level structure of <sup>141</sup> Ba and <sup>139</sup> Xe and the level systematics of N = 85 even-odd isotones

New level schemes of 141 Ba and 139 Xe are proposed from analysis of the gamma data from 252 Cf spontaneous fission in Gammasphere. By analogy with the N = 85 even-odd isotones 149 Gd, 147 Sm, and 145 Nd, spins and parities were assigned to the observed excited states in 141 Ba and 139 Xe. Level systematics in the N = 85 even-odd isotones from Gd (Z = 64) to Te (Z = 52) are discussed. The level systematics and comparison with neighboring even-even isotopes indicate that quadrupole and octupole collectivities play a role in 141 Ba and 139 Xe. From Gd (Z = 64) to Te (Z=52), increasing excitation energies of the 13/2 + states and lowering relative intensities of the positive-parity bands in the N = 85 even-odd isotones may indicate that the octupole strength is becoming weaker for the isotones when approaching the Z = 50 closed shell.

Luo, Y. X., Rasmussen, J. O., Hamilton, J. H., Ramayya, A. V., Hwang, J. K., Beyer, C. J., ... Asztalos, S. J.

Luo, YX||Rasmussen, JO||Hamilton, JH||Ramayya, AV||Hwang, JK||Beyer, CJ||Zhu, SJ||Kormicki, J||Zhang, XQ||Jones, EF||Gore, PM||Ginter, TN||Gregorich, KE||Lee, IY||Macchiavelli, AO||Zielinski, P||Folden, CM||Fallon, P||Ter-Akopian, GM||Oganessian, YT||Daniel, AV||Stoyer, MA||Cole, JD||Donangelo, R||Wu, SC||Asztalos, SJ

Level structure of ¹⁴¹ Ba and ¹³⁹ Xe and the level systematics of N = 85 even-odd isotones Academic Article