FIZIKA B 12 (2003) 2, 85 - 96
COLLECTIVE AND SINGLE-PARTICLE STRUCTURES IN NEUTRON-RICH NUCLEI
J. H. HAMILTONa, S. J. ZHUa,b,c, Y. X. LUOa,c,d,
J. K. HWANGa,
A. V. RAMAYYAa, P. M. GORE, J. O. RASMUSSENc and GANDS
aPhysics Department, Vanderbilt University, Nashville, TN
37235, U. S. A.
bDepartment of Physics, Tsinghua University, Beijing 100084, China
cJoint Institute for Heavy Ion Research, Oak Ridge, TN 37830, U. S. A.
dLawrence Berkeley National Laboratory, Berkeley, CA 94720, U. S. A.
Received 14 March 2002; revised manuscript received
26 February 2003
Accepted 10 March 2003 Online 3 March 2004
The neutron-rich nuclei of 104,106Mo, 139,141Ba, 139Xe,
115,117Ag and 133,135Te have been studied by using the spontaneous
fission source of 252Cf with the Gammasphere array. In the present work, the
collective and single-particle structures in these neutron-rich nuclei have been reported.
Gamma-type vibrational bands in 104,106Mo, particle and hole states, including
candidates for tilted rotor bands in 133,135Te and a 7/2 rotational band
in both 115,117Ag have been observed. The N=83 135Te and 139Ba
show marked differences associated with differences in their particle and hole states. New
levels in 141Ba and 139Xe extend evidence for two opposite-parity
doublets characteristic of stable octupole deformation.
PACS numbers: 21.10.-k, 27.60.+j, 25.85.Ca, 21.60.Cs
Keywords: neutron-rich nuclei, fission, tilted rotor bands, particle-hole states