AI Article Synopsis
- The study discusses how the size and shape of the neutron skin in lead-208 ((208)Pb) were analyzed using pion photoproduction cross sections measured by the Crystal Ball detector at the MAMI facility.
- The neutron distribution was characterized with specific measurements: a half-height radius of 6.70 ± 0.03 fm and a diffuseness of 0.55 ± 0.01(stat) (-0.03)(+0.02)(sys) fm, leading to a neutron skin thickness of 0.15 ± 0.03(stat) (-0.03)(+0.01)(sys) fm.
- This is the first time neutron skin thickness has been effectively measured using an electromagnetic approach, revealing that
Article Abstract
Information on the size and shape of the neutron skin on (208)Pb is extracted from coherent pion photoproduction cross sections measured using the Crystal Ball detector together with the Glasgow tagger at the MAMI electron beam facility. On exploitation of an interpolated fit of a theoretical model to the measured cross sections, the half-height radius and diffuseness of the neutron distribution are found to be c(n)=6.70±0.03(stat.) fm and a(n)=0.55±0.01(stat.)(-0.03)(+0.02)(sys.) fm, respectively, corresponding to a neutron skin thickness Δr(np)=0.15±0.03(stat.)(-0.03)(+0.01)(sys.) fm. The results give the first successful extraction of a neutron skin thickness with an electromagnetic probe and indicate that the skin of (208)Pb has a halo character. The measurement provides valuable new constraints on both the structure of nuclei and the equation of state for neutron-rich matter.
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| http://dx.doi.org/10.1103/PhysRevLett.112.242502 | DOI Listing |
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