Data di Pubblicazione:
2021
Citazione:
Beam-normal single-spin asymmetry in elastic scattering of electrons from a spin-0 nucleus / O. Koshchii, M. Gorchtein, X. Roca-Maza, H. Spiesberger. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 103:6(2021 Jun 15), pp. 064316.1-064316.12. [10.1103/PhysRevC.103.064316]
Abstract:
We study the beam-normal single-spin asymmetry (BNSSA) in high-energy elastic electron scattering from several spin-0 nuclei. Existing theoretical approaches work in the plane-wave formalism and predict the BNSSA to scale as ∼ A /Z with the atomic number
Z
and nuclear mass number
A
. While this prediction holds for light and intermediate nuclei, a striking disagreement in both the sign and the magnitude of BNSSA was observed by the PREX collaboration for
208
Pb
, coined the “PREX puzzle.” To shed light on this disagreement, we go beyond the plane-wave approach which neglects Coulomb distortions known to be significant for heavy nuclei. We explicitly investigate the dependence of BNSSA on
A
and
Z
by (i) including inelastic intermediate states' contributions into the Coulomb problem in the form of an optical potential, (ii) by accounting for the experimental information on the
A
-dependence of the Compton slope parameter, and (iii) giving a thorough account of the uncertainties of the calculation. Despite of these improvements, the PREX puzzle remains unexplained. We discuss further strategies to resolve this riddle.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
O. Koshchii, M. Gorchtein, X. Roca-Maza, H. Spiesberger
Link alla scheda completa:
Link al Full Text: