FIZIKA B 12 (2003)  2, 85 - 96

COLLECTIVE AND SINGLE-PARTICLE STRUCTURES IN NEUTRON-RICH NUCLEI

J. H. HAMILTON^a, S. J. ZHU^a,b,c, Y. X. LUO^a,c,d, J. K. HWANG^a,
A. V. RAMAYYA^a, P. M. GORE, J. O. RASMUSSEN^c and GANDS collaborations

^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.

Paper devoted to honour the memory of Professor Nikola Cindro

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[413] 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
UDC 539.165

Keywords: neutron-rich nuclei, fission, tilted rotor bands, particle-hole states

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