Neutron skin of 208Pb from Coherent Pion Photoproduction (CROSBI ID 210029)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Tarbert, C.M. ; ... ; Knežević, Andrea ; ... ; Korolija, Milorad ; ... ; Mekterović, Darko ; ... ; Supek, Ivan ; ... ; Zehr, F.
engleski
Neutron skin of 208Pb from Coherent Pion Photoproduction
Information on the size and shape of the neutron skin on 208Pb 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 cn=6.70±0.03(stat.)fm and an=0.55±0.01(stat.)+0.02−0.03(sys.)fm respectively, corresponding to a neutron skin thickness ∆r(np)=0.15±0.03(stat.)+0.01−0.03(sys.)fm. The results give the first successful extraction of a neutron skin thickness with an electromagnetic probe and indicate that the skin of 208Pb 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.
neutron skin ; 208Pb ; udarni presjek pionske fotoprodukcije ; CB ; MAMI
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Podaci o izdanju
112 (24)
2014.
242502
18
objavljeno
0031-9007
1079-7114
10.1103/PhysRevLett.112.242502