Stable and vibrational octupole modes in neutron rich nuclei
- Physics Department, Vanderbilt University, Nashville, Tennessee 37235 (United States)
Evidence for stable octupole deformation in neutron-rich nuclei bounded by Z=54-58 and N=85-92 is described. More vibrational type octupole modes are observed to either side of this region in {sup 140}Ba and {sup 152,154}Nd. The largest stable octupole deformation ({beta}{sub 3}{approx}0.1) is reported in {sup 144}Ba{sub gg}. The theoretically predicted quenching ({beta}{sub 3}{yields}0) of stable octupole deformation with increased rotation is observed in {sup 146}Ba. There is good agreement between theory and experiment for the strongly varying electric dipole moments as a function of mass for {sup 142-148}Ba. In odd-A {sup 143}Ba and odd-Z, {sup 145}La, two pairs of positive and negative parity bands with opposite spins, parity doublets are observed. In {sup 145}La the ground band with symmetric shape coexists with the asymmetric octupole shape which stabilizes above about spin 19/2{sup +}. The isotope {sup 109}Mo was identified and a new region of stable octupole deformation is identified in {sup 107,109}Mo centered around N=64-66 as earlier predicted. This is the first case of stable octupole deformation involving only one pair of orbitals. (c) 1999 American Institute of Physics.
- OSTI ID:
- 20216651
- Journal Information:
- AIP Conference Proceedings, Vol. 481, Issue 1; Other Information: PBD: 2 Sep 1999; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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