Maqola

Octupole collectivity in the ground band of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Nd</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>148</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>

R. W. IbbotsonNuclear Structure Research Laboratory, University of Rochester, Rochester, New York 14627Carmen WhiteNuclear Structure Research Laboratory, University of Rochester, Rochester, New York 14627T. CzosnykaScience and Engineering Research Council, Daresbury Laboratory, Warrington WA4 4AD, United KingdomP. A. ButlerDepartment of Physics, University of York, York YO1 5DD, United KingdomN. ClarksonScience and Engineering Research Council, Daresbury Laboratory, Warrington WA4 4AD, United KingdomD. ClineOliver Lodge Laboratory, Univeristy of Liverpool, Liverpool L69 3BX, United KingdomR.A. CunninghamDepartment of Physics, University of York, York YO1 5DD, United KingdomM. DevlinDepartment of Physics, University of York, York YO1 5DD, United KingdomK. G. HelmerNuclear Structure Research Laboratory, University of Rochester, Rochester, New York 14627T. H. HoareOliver Lodge Laboratory, Univeristy of Liverpool, Liverpool L69 3BX, United KingdomJ. R. HughesDepartment of Physics, University of York, York YO1 5DD, United KingdomG. D. JonesDepartment of Physics, University of York, York YO1 5DD, United KingdomA.E. KavkaScience and Engineering Research Council, Daresbury Laboratory, Warrington WA4 4AD, United KingdomB. KotlińskiDepartment of Physics, University of York, York YO1 5DD, United KingdomR J PoynterDepartment of Physics, University of York, York YO1 5DD, United KingdomP. H. ReganOliver Lodge Laboratory, Univeristy of Liverpool, Liverpool L69 3BX, United KingdomE.G. VogtNuclear Structure Research Laboratory, University of Rochester, Rochester, New York 14627R. WadsworthOliver Lodge Laboratory, Univeristy of Liverpool, Liverpool L69 3BX, United KingdomD. L. WatsonNuclear Structure Research Laboratory, University of Rochester, Rochester, New York 14627C. Y. WuNuclear Structure Research Laboratory, University of Rochester, Rochester, New York 14627

1993lv

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ABI

Annotatsiya

E3 matrix elements have been determined for transitions between states up to ${\mathit{I}}^{\mathrm{\ensuremath{\pi}}}$=${13}^{\mathrm{\ensuremath{-}}}$ in $^{148}\mathrm{Nd}$, providing direct evidence for strong octupole collectivity in a rotational band. These values, as well as the corresponding E1 and E2 matrix elements, were obtained from Coulomb excitation data using $^{58}\mathrm{Ni}$ and $^{92}\mathrm{Mo}$ ions, projectile excitation using a $^{208}\mathrm{Pb}$ target, and from recoil distance lifetime measurements. The results are consistent with collective model predictions for $^{148}\mathrm{Nd}$ assuming intrinsic quadrupole and octupole moments of ${\mathit{Q}}_{20}$\ensuremath{\approxeq}400 e ${\mathrm{fm}}^{2}$ and ${\mathit{Q}}_{30}$\ensuremath{\approxeq}1500 e ${\mathrm{fm}}^{3}$. The E3 strength coupling the negative-parity states to the \ensuremath{\beta} band is found to be appreciable.

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DOI: 10.1103/physrevlett.71.1990

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