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First evidence for the hyperdeformed nuclear shape at high angular momentum

A. Galindo-UribarriDepartment of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7H.R. AndrewsAECL Research, Chalk River Laboratories, Ontario, Canada, K0J 1J0G. C. BallDepartment of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7T.E. DrakeDepartment of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7V. P. JanzenAECL Research, Chalk River Laboratories, Ontario, Canada, K0J 1J0J. A. KuehnerAECL Research, Chalk River Laboratories, Ontario, Canada, K0J 1J0; Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1; Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7; Joint Institute for Heavy Ion Research, Oak Ridge, Tennessee 37831S. M. MullinsDepartment of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1Rebecca Gagnemo PerssonDepartment of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1D. PrévostAECL Research, Chalk River Laboratories, Ontario, Canada, K0J 1J0; Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1; Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7; Joint Institute for Heavy Ion Research, Oak Ridge, Tennessee 37831D. C. RadfordJoint Institute for Heavy Ion Research, Oak Ridge, Tennessee 37831J. C. WaddingtonDepartment of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7D.A. WardDepartment of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1R. WyssAECL Research, Chalk River Laboratories, Ontario, Canada, K0J 1J0

1993en

ABI

Annotatsiya

A ridge structure consisting of stretched E2 transitions and extending from \ensuremath{\Elzxh}\ensuremath{\omega}\ensuremath{\simeq}0.6 to 0.75 MeV has been found in a proton-selected \ensuremath{\gamma}-\ensuremath{\gamma} matrix in the reaction $^{120}\mathrm{Sn}$${(}^{37}$Cl, xn${)}^{152,153}$Dy at 187 MeV. The ridge spacing corresponds to a dynamic moment of inertia, ${\mathit{scrI}}^{(2)}$, of about 130${\mathrm{\ensuremath{\Elzxh}}}^{2}$ ${\mathrm{MeV}}^{\mathrm{\ensuremath{-}}1}$ and suggests the existence of a hyperdeformed prolate shape with a quadrupole deformation ${\mathrm{\ensuremath{\beta}}}_{2}$\ensuremath{\ge}0.9. Furthermore, a cascade of 10 discrete transitions with an average energy spacing of 30\ifmmode\pm\else\textpm\fi{}3 keV has been found. This result is consistent with calculations indicating conditions favorable to hyperdeformed structures.

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DOI: 10.1103/physrevlett.71.231

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