Extraction of anti-analog giant dipole resonance and neutron skin thickness for 208Pb

Jumpei Yasuda, Tomotsugu Wakasa, Midori Okamoto, Masanori Dozono, Kichiji Hatanaka, Munetake Ichimura, Sho Kuroita, Yukie Maeda, Tetsuo Noro, Yasuhiro Sakemi, Masaki Sasano, Kentaro Yako

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6 Citations (Scopus)


The anti-analog giant dipole resonance (AGDR) was separated from other excitations such as the spin-dipole resonance by multipole decomposition analysis of the 208Pb(→p,→n) reaction at a bombarding energy of Tp = 296MeV. The polarization transfer observables were found to be useful for carrying out this separation. The energy difference between the AGDR and the isobaric analog state (IAS)was determined to beΔE = 8.69 ± 0.36MeV,where the uncertainty includes both statistical and systematic contributions. Theoretical calculations using the proton-neutron relativistic quasi-particle random phase approximation predicted a strong correlation between ΔE and the neutron skin thickness ΔRpn. Under the assumption that the correlation predicted in this model is correct, the present ΔE value corresponds to a neutron skin thickness of ΔRpn = 0.216 ± 0.046 ± 0.015 fm, where the first and second uncertainties are the experimental and theoretical uncertainties, respectively.

Original languageEnglish
Article number063D02
JournalProgress of Theoretical and Experimental Physics
Issue number6
Publication statusPublished - 2013 Jun


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