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The cluster structure of the neutron-rich isotope $^{10}$Be has been probedvia the $(p,p\alpha)$ reaction at 150 MeV/nucleon in inverse kinematics and inquasifree conditions. The populated states of $^{6}$He residues wereinvestigated through missing mass spectroscopy. The triple differentialcross-section for the ground-state transition was extracted for quasifree anglepairs ($\theta_{p}$, $\theta_{\alpha}$) and compared to distorted-wave impulseapproximation reaction calculations performed in a microscopic framework usingsuccessively the Tohsaki-Horiuchi-Schuck-R\"opke product wave-function and thewave-function deduced from Antisymmetrized Molecular Dynamics calculations. Theremarkable agreement between calculated and measured cross-sections in bothshape and magnitude validates the molecular structure description of the$^{10}$Be ground-state, configured as an $\alpha$-$\alpha$ core with twovalence neutrons occupying $\pi$-type molecular orbitals.

physical review letters

Validation of the $^{10}\mathrm{Be}$ Ground-State Molecular Structure  Using $^{10}\mathrm{Be}(p,p\alpha)^{6}\mathrm{He}$ Triple Differential  Reaction Cross-Section Measurements