Level structure of 141 Ba and 139 Xe and the level systematics of N = 85 even-odd isotones
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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.
Physical Review C - Nuclear Physics
author list (cited authors)
Luo, Y. X., Rasmussen, J. O., Hamilton, J. H., Ramayya, A. V., Hwang, J. K., Beyer, C. J., ... Asztalos, S. J.
complete list of authors
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