Impact of Clustering on the .sup.8./sup.Li β Decay and Recoil Form Factors

0558303 - ÚJF 2023 RIV US eng J - Článek v odborném periodiku
Sargsyan, G. H. - Launey, K. D. - Burkey, M. T. - Gallant, A. T. - Scielzo, N. D. - Savard, G. - Mercenne, A. - Dytrych, Tomáš - Langr, D. - Varriano, L. - Longfellow, B. - Hirsh, T. Y. - Draayer, J. P.
Impact of Clustering on the ⁸Li β Decay and Recoil Form Factors.
Physical Review Letters. Roč. 128, č. 10 (2022), č. článku 202503. ISSN 0031-9007. E-ISSN 1079-7114
Grant CEP: GA ČR(CZ) GA22-14497S
Institucionální podpora: RVO:61389005
Klíčová slova: beta decay * Li-8 * corrections
Obor OECD: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Impakt faktor: 8.6, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1103/PhysRevLett.128.202503

We place unprecedented constraints on recoil corrections in the beta decay of Li-8, by identifying a strong correlation between them and the Li-8 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 a + a system that is energetically accessible to beta decay but has not been observed in the experimental Be-8 energy spectrum, and has an important effect on the recoil corrections and beta 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.
Trvalý link: http://hdl.handle.net/11104/0332030