Vanishing spin alignment: Experimental indication of a triaxial<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>28</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Si</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mo>+</mml:mo></mml:mrow><mml:mrow><mml:mn>28</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Si</mml:mi></mml:math>nuclear molecule

Fragment-fragment-$\ensuremath{\gamma}$ coincidences have been measured for ${}^{28}\mathrm{Si}{+}^{28}\mathrm{Si}$ at an energy corresponding to the population of a conjectured resonance in ${}^{56}\mathrm{Ni}.$ Fragment angular distributions as well as $\ensuremath{\gamma}$-ray angular correlations indicate that the spin orientations of the outgoing fragments are perpendicular to the orbital angular momentum. This differs from the ${}^{24}\mathrm{Mg}{+}^{24}\mathrm{Mg}$ and the ${}^{12}\mathrm{C}{+}^{12}\mathrm{C}$ resonances, and suggests two oblate ${}^{28}\mathrm{Si}$ nuclei interacting in an equator-to-equator molecular configuration.

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