Molecular Alpha-Particle Clustering in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ra</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>218</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>; Dipole Collectivity in the Vicinity of Nuclear Shell Closures
M. GaiA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511J. F. EnnisA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511M. RuscevA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511E. C. SchloemerA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511B. ShivakumarA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511S. M. SterbenzA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511N. TsoupasA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511D. A. BromleyA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511
1983lv
ABI
Annotatsiya
Evidence for the presence of alpha-particle clustering in $^{218}\mathrm{Ra}$ comes from a number of observables: binding energy, ${S}_{2n}$, ${Q}_{\ensuremath{\alpha}}$, ${E}_{x}({J}^{\ensuremath{\pi}})$, ${{\ensuremath{\theta}}_{\ensuremath{\alpha}}}^{2}$, and ${F}_{\ensuremath{\alpha}}$. That this clustering is a signature for the new dipole collectivity suggested by Iachello and Jackson follows from observation of simultaneous enhancement of selected $E1$, $E2$, and $E3$ deexcitation transition matrix elements; of these the $E1$ enhancement is most pronounced as would be expected for dipole collectivity.
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