Information Content of the Parity-Violating Asymmetry in Pb208

Reinhard, Paul-Gerhard; Roca-Maza, Xavier; Nazarewicz, Witold

doi:10.1103/physrevlett.127.232501

Information Content of the Parity-Violating Asymmetry in Pb 208

Journal Article · Mon Nov 29 00:00:00 EST 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.127.232501· OSTI ID:1871675

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Univ. Erlangen (Germany); FRIB/MSU
Univ. degli Studi di Milano (Italy); INFN, Milano (Italy)
Michigan State Univ., East Lansing, MI (United States)

The parity-violating asymmetry A_PV in ²⁰⁸Pb, recently measured by the PREX-2 Collaboration, is studied using modern relativistic (covariant) and nonrelativistic energy density functionals. We first assess the theoretical uncertainty on A_PV which is intrinsic to the adopted approach. To this end, we use quantified functionals that are able to accommodate our previous knowledge on nuclear observables such as binding energies, charge radii, and the dipole polarizability α_D of ²⁰⁸Pb. We then add the quantified value of A_PV together with α_D to our calibration dataset to optimize new functionals. Based on these results, we predict a neutron skin thickness in ²⁰⁸Pb r_skin = 0.19 ± 0.02 fm and the symmetry-energy slope L = 54 ± 8 MeV. These values are consistent with other estimates based on astrophysical data and are significantly lower than those recently reported using a particular set of relativistic energy density functionals. Here, we also make a prediction for the A_PV value in ⁴⁸Ca that will be soon available from the CREX measurement.

View Accepted Manuscript (DOE)

Research Organization:: Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0013365; SC0018083

OSTI ID:: 1871675

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 23 Vol. 127; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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