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Pygmy and core polarization dipole modes in Pb-206: Connecting nuclear structure to stellar nucleosynthesis
https://repo.qst.go.jp/records/48643
https://repo.qst.go.jp/records/4864311088478-f586-473d-9c67-b95c928e6b66
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2018-03-27 | |||||
| タイトル | ||||||
| タイトル | Pygmy and core polarization dipole modes in Pb-206: Connecting nuclear structure to stellar nucleosynthesis | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Tonchev, A.P.
× Tonchev, A.P.× Tsoneva, T.× Bhatia, C.× Arnold, C.W.× Goriely, S.× Hammond, S.L.× Kelley, J.H.× Kwan, E.× Lenske, H.× Piekarewicz, J.× Raut, R.× Rusev, G.× 静間, 俊行× Tornow, W.× 静間 俊行 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | A high-resolution study of the electromagnetic response of 206Pb below the neutron separation energy is performed using a (g,g) experiment at the HIgS facility. Nuclear resonance fluorescence with 100% linearly polarized photon beams is used to measure spins, parities, branching ratios, and decay widths of excited states in 206Pb from 4.9to 8.1 MeV. The extracted B(E1) ↑ and B(M1) ↑ values for the total electric and magnetic dipole strength below the neutron separation energy are 0.9 ± 0.2e2 fm2 and 8.3 ± 2.0μ2N , respectively. These measurements are found to be in very good agreement with the predictions from an energy-density functional (EDF) plus quasiparticle phonon model (QPM). Such a detailed theoretical analysis allows to separate the pygmy dipole resonance from both the tail of the giant dipole resonance and multi-phonon excitations. Combined with earlier photonuclear experiments above the neutron separation energy, one extracts a value for the electric dipole polarizability of 206Pb of αD = 122 ± 10 mb/MeV. When compared to predictions from both the EDF+QPM aand a corresponding range for the slope of the symmetry energy of L = 48–60 MeV. This newly obtained information is also used to estimate the Maxwellian-averaged radiative cross section 205Pb(n, γ )206Pb at 30 keV to be σ = 130 ± 25 mb. The astrophysical impact of this measurement—on both the s-process in stellar nucleosynthesis and on the equation of state of neutron-rich matter—is discussed. | |||||
| 書誌情報 |
Physics Letters B 巻 773, p. 20-25, 発行日 2017-08 |
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| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1016/j.physletb.2017.07.062 | |||||
