Low-energy electric dipole response in 120Sn

A. M. Krumbholz, P. von Neumann-Cosel, T. Hashimoto, A. Tamii, T. Adachi, C. A. Bertulani, H. Fujita, Y. Fujita, E. Ganioglu, K. Hatanaka, C. Iwamoto, T. Kawabata, N. T. Khai, A. Krugmann, D. Martin, H. Matsubara, R. Neveling, H. Okamura, H. J. Ong, I. PoltoratskaV. Yu Ponomarev, A. Richter, H. Sakaguchi, Y. Shimbara, Y. Shimizu, J. Simonis, F. D. Smit, G. Susoy, J. H. Thies, T. Suzuki, M. Yosoi, J. Zenihiro

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    Abstract

    The electric dipole strength distribution in 120Sn has been extracted from proton inelastic scattering experiments at Ep=295 MeV and at forward angles including 0°. It differs from the results of a Sn120(γ,γ') experiment and peaks at an excitation energy of 8.3 MeV. The total strength corresponds to 2.3(2)% of the energy-weighted sum rule and is more than three times larger than what is observed with the (γ, γ') reaction. This implies a strong fragmentation of the E1 strength and/or small ground state branching ratios of the excited 1- states.

    Original languageEnglish
    Pages (from-to)7-12
    Number of pages6
    JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
    Volume744
    DOIs
    Publication statusPublished - 2015 May 1

    Keywords

    • E1 strength below neutron threshold
    • Relativistic Coulomb excitation
    • Sn120(p,p'), E=295 MeV

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

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