English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The $^{208}$Pb($p$,$n\gamma\bar p$) $^{207}$Pb reaction at a beam energy of30 MeV has been used to excite the anti-analog of the giant dipole resonance(AGDR) and to measure its $\gamma$-decay to the isobaric analog state incoincidence with proton decay of IAS. The energy of the transition has alsobeen calculated with the self-consistent relativistic random-phaseapproximation (RRPA), and found to be linearly correlated to the predictedvalue of the neutron-skin thickness ($\Delta R_{pn}$). By comparing thetheoretical results with the measured transition energy, the value of 0.190$\pm$ 0.028 fm has been determined for $\Delta R_{pn}$ of $^{208}$Pb, inagreement with previous experimental results. The AGDR excitation energy hasalso been used to calculate the symmetry energy at saturation ($J=32.7 \pm 0.6$MeV) and the slope of the symmetry energy ($L=49.7 \pm 4.4$ MeV), resulting inmore stringent constraints than most of the previous studies.

Neutron-skin thickness of $^{208}$Pb, and symmetry-energy constraints from the study of the anti-analog giant dipole resonance