Authors
Sargsyan, G.; Launey, K.; Burkey, M. T.; Gallant, A; Scielzo, N.; Savard, G.; Mercenne, A.; Dytrych, T.; Langr, D.; Varriano, L.
Abstract
We place unprecedented constraints on recoil corrections in the 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. In addition, our calculations predict a 2 state of the system that is energetically accessible to decay but has not been observed in the experimental 8Be energy spectrum, and has an important effect on the recoil corrections and decay for the A 8 systems. This state and an associated 0 state are notoriously difficult to model due to their clusterstructure and collective correlations, but become feasible for calculations in the ab initio symmetry-adapted no-core shell-model framework