Impact of clustering on the 8Li β decay and recoil form factors
Abstract
We place unprecedented constraints on recoil corrections in the β decay of 8Li, by identifying a strong correlation between them and the 8Li ground state quadrupole moment in large-scale ab initio calculations. The results are essential for improving the sensitivity of high-precision experiments that probe the weak interaction theory and test physics beyond the Standard Model (BSM). In addition, our calculations predict a 2+ state of the α+α system that is energetically accessible to β decay but has not been observed in the experimental 8Be energy spectrum, and has an important effect on the recoil corrections and β decay for the A=8 systems. This state and an associated 0+ state are notoriously difficult to model due to their cluster structure and collective correlations, but become feasible for calculations in the ab initio symmetry-adapted no-core shell-model framework.
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