Speaker
N. T. Brewer
(Vanderbilt University)
Description
Gamma-rays from the Spontaneous Fission of 252Cf were measured with Gammasphere and have given great insight into the structure of neutron rich nuclei. We have examined high-spin states and the gamma-transitions associated with octupole correlations in {143-146{Ba and 148Ce. Coexisting quadrupole/octupole deformation is characterized by two Delta I = 1 rotational bands with opposite parities. The states in these two rotational bands are described by a quantum number called simplex with s^2 = (-1)^A. In 143Ba, the levels are extended to 43/2^+ with a total of six new levels along with two new transitions. In 144Ba, we have placed new levels including three E1 transitions and 8 linking transitions to the s = +1 band to give more definitive evidence for the s = -1 band. Six new levels are found in 145Ba. For 144Ba and 148Ce we have, for the first time in even-even isotopes, confirmed the spin/parity of some s = -1 levels using angular correlations.
Co-authors
A. V. Daniel
(Joint Institute for Nuclear Research)
A. V. Ramayya
(Vanderbilt University)
C. Goodin
(Vanderbilt University)
G. M. Ter-Akopian
(Joint Institute for Nuclear Research)
J. H. Hamilton
(Vanderbilt University)
J. K. Hwang
(Vanderbilt University)
J. O. Rasmussen
(Lawrence Berkeley National Laboratory)
N. T. Brewer
(Vanderbilt University)
S. H. Liu
(Vanderbilt University)
S. J. Zhu
(Vanderbilt University and Tsinghua University)
W. A. Yzaguirre
(Vanderbilt University)
Y. X. Luo
(Vanderbilt University and Lawrence Berkeley National Laboratory)
