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Lifetimes of states in the opposite-parity bands of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>153</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">E</mml:mi><mml:mi mathvariant="normal">u</mml:mi><mml:mo>:</mml:mo></mml:math>Recoil-distance measurements following Coulomb excitation

J. F. SmithOliver Lodge Laboratory, University of Liverpool, Liverpool, L69 3BX, United KingdomM. W. SimonNuclear Structure Research Laboratory, University of Rochester, Rochester, New York 14627R. W. IbbotsonNuclear Structure Research Laboratory, University of Rochester, Rochester, New York 14627P. A. ButlerOliver Lodge Laboratory, University of Liverpool, Liverpool, L69 3BX, United KingdomA. AprahamianPhysics Department, University of Notre Dame, Notre Dame, Indiana 46556A. M. BruceDepartment of Mechanical and Manufacturing Engineering, University of Brighton, Brighton, BN2 4GJ, United KingdomD. ClineNuclear Structure Research Laboratory, University of Rochester, Rochester, New York 14627M. DevlinNuclear Structure Research Laboratory, University of Rochester, Rochester, New York 14627Graeme JonesOliver Lodge Laboratory, University of Liverpool, Liverpool, L69 3BX, United KingdomPeter G. JonesOliver Lodge Laboratory, University of Liverpool, Liverpool, L69 3BX, United KingdomC. Y. WuNuclear Structure Research Laboratory, University of Rochester, Rochester, New York 14627

1998lv

ABI

Annotatsiya

The lifetimes of 12 states in the opposite-parity bands of ${}^{153}\mathrm{Eu}$ have been measured using a recoil-distance technique following Coulomb excitation with a 220-MeV ${}^{58}\mathrm{Ni}$ beam. Electric-quadrupole ${(Q}_{0})$ and -dipole ${(D}_{0})$ moments, and intrinsic g factors ${(g}_{K})$ have been extracted from the lifetimes. The ${Q}_{0}$ and ${D}_{0}$ values show very little dependence on spin and parity, and have the values of approximately 6.6 e b and 0.077 e fm, respectively. The ${g}_{K}$ values are found to differ for the positive- and negative-parity states. Although the large ${D}_{0}$ values suggest a reflection-asymmetric octupole-deformed nuclear shape, the different ${g}_{K}$ values contradict this interpretation. A discussion of the nuclear structure of ${}^{153}\mathrm{Eu}$ in terms of potential parity-doublet bands and octupole deformation is given.

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DOI: 10.1103/physrevc.58.3171

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