Separation of pygmy dipole and M1 resonances in Zr90 by a High-resolution inelastic proton scattering near 0°

C. Iwamoto, H. Utsunomiya, A. Tamii, H. Akimune, H. Nakada, T. Shima, T. Yamagata, T. Kawabata, Y. Fujita, H. Matsubara, Y. Shimbara, M. Nagashima, T. Suzuki, H. Fujita, Makoto Sakuda, T. Mori, T. Izumi, A. Okamoto, T. Kondo, B. BilgierH. C. Kozer, Y. W. Lui, K. Hatanaka

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Abstract

A high-resolution measurement of inelastic proton scattering off Zr90 near 0° was performed at 295 MeV with a focus on a pronounced strength previously reported in the low-energy tail of giant dipole resonance. A forest of fine structure was observed in the excitation energy region 7-12 MeV. A multipole decomposition analysis of the angular distribution for the forest was carried out using the ECIS95 distorted-wave Born approximation code with the Hartree-Fock plus random-phase approximation model of E1 and M1 transition densities and inclusion of E1 Coulomb excitation. The analysis separated pygmy dipole and M1 resonances in the forest at E PDR=9.15±0.18MeV with Γ PDR=2.91±0.64MeV and at E M1=9. 53±0.06MeV with Γ M1=2.70±0.17MeV in the Lorentzian function, respectively. The B(E1) value for pygmy dipole resonance over 7-11 MeV is 0.75±0.08e2fm2, which corresponds to 2.1±0.2% of the Thomas-Reiche-Kuhn sum rule.

Original languageEnglish
Article number262501
JournalPhysical Review Letters
Volume108
Issue number26
DOIs
Publication statusPublished - Jun 27 2012

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proton scattering
inelastic scattering
dipoles
high resolution
Born approximation
multipoles
sum rules
excitation
angular distribution
fine structure
inclusions
decomposition
energy
approximation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Iwamoto, C., Utsunomiya, H., Tamii, A., Akimune, H., Nakada, H., Shima, T., ... Hatanaka, K. (2012). Separation of pygmy dipole and M1 resonances in Zr90 by a High-resolution inelastic proton scattering near 0°. Physical Review Letters, 108(26), [262501]. https://doi.org/10.1103/PhysRevLett.108.262501

Separation of pygmy dipole and M1 resonances in Zr90 by a High-resolution inelastic proton scattering near 0°. / Iwamoto, C.; Utsunomiya, H.; Tamii, A.; Akimune, H.; Nakada, H.; Shima, T.; Yamagata, T.; Kawabata, T.; Fujita, Y.; Matsubara, H.; Shimbara, Y.; Nagashima, M.; Suzuki, T.; Fujita, H.; Sakuda, Makoto; Mori, T.; Izumi, T.; Okamoto, A.; Kondo, T.; Bilgier, B.; Kozer, H. C.; Lui, Y. W.; Hatanaka, K.

In: Physical Review Letters, Vol. 108, No. 26, 262501, 27.06.2012.

Research output: Contribution to journalArticle

Iwamoto, C, Utsunomiya, H, Tamii, A, Akimune, H, Nakada, H, Shima, T, Yamagata, T, Kawabata, T, Fujita, Y, Matsubara, H, Shimbara, Y, Nagashima, M, Suzuki, T, Fujita, H, Sakuda, M, Mori, T, Izumi, T, Okamoto, A, Kondo, T, Bilgier, B, Kozer, HC, Lui, YW & Hatanaka, K 2012, 'Separation of pygmy dipole and M1 resonances in Zr90 by a High-resolution inelastic proton scattering near 0°', Physical Review Letters, vol. 108, no. 26, 262501. https://doi.org/10.1103/PhysRevLett.108.262501
Iwamoto, C. ; Utsunomiya, H. ; Tamii, A. ; Akimune, H. ; Nakada, H. ; Shima, T. ; Yamagata, T. ; Kawabata, T. ; Fujita, Y. ; Matsubara, H. ; Shimbara, Y. ; Nagashima, M. ; Suzuki, T. ; Fujita, H. ; Sakuda, Makoto ; Mori, T. ; Izumi, T. ; Okamoto, A. ; Kondo, T. ; Bilgier, B. ; Kozer, H. C. ; Lui, Y. W. ; Hatanaka, K. / Separation of pygmy dipole and M1 resonances in Zr90 by a High-resolution inelastic proton scattering near 0°. In: Physical Review Letters. 2012 ; Vol. 108, No. 26.
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abstract = "A high-resolution measurement of inelastic proton scattering off Zr90 near 0° was performed at 295 MeV with a focus on a pronounced strength previously reported in the low-energy tail of giant dipole resonance. A forest of fine structure was observed in the excitation energy region 7-12 MeV. A multipole decomposition analysis of the angular distribution for the forest was carried out using the ECIS95 distorted-wave Born approximation code with the Hartree-Fock plus random-phase approximation model of E1 and M1 transition densities and inclusion of E1 Coulomb excitation. The analysis separated pygmy dipole and M1 resonances in the forest at E PDR=9.15±0.18MeV with Γ PDR=2.91±0.64MeV and at E M1=9. 53±0.06MeV with Γ M1=2.70±0.17MeV in the Lorentzian function, respectively. The B(E1) value for pygmy dipole resonance over 7-11 MeV is 0.75±0.08e2fm2, which corresponds to 2.1±0.2{\%} of the Thomas-Reiche-Kuhn sum rule.",
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AU - Iwamoto, C.

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AU - Akimune, H.

AU - Nakada, H.

AU - Shima, T.

AU - Yamagata, T.

AU - Kawabata, T.

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AU - Mori, T.

AU - Izumi, T.

AU - Okamoto, A.

AU - Kondo, T.

AU - Bilgier, B.

AU - Kozer, H. C.

AU - Lui, Y. W.

AU - Hatanaka, K.

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N2 - A high-resolution measurement of inelastic proton scattering off Zr90 near 0° was performed at 295 MeV with a focus on a pronounced strength previously reported in the low-energy tail of giant dipole resonance. A forest of fine structure was observed in the excitation energy region 7-12 MeV. A multipole decomposition analysis of the angular distribution for the forest was carried out using the ECIS95 distorted-wave Born approximation code with the Hartree-Fock plus random-phase approximation model of E1 and M1 transition densities and inclusion of E1 Coulomb excitation. The analysis separated pygmy dipole and M1 resonances in the forest at E PDR=9.15±0.18MeV with Γ PDR=2.91±0.64MeV and at E M1=9. 53±0.06MeV with Γ M1=2.70±0.17MeV in the Lorentzian function, respectively. The B(E1) value for pygmy dipole resonance over 7-11 MeV is 0.75±0.08e2fm2, which corresponds to 2.1±0.2% of the Thomas-Reiche-Kuhn sum rule.

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