Low-energy electric dipole response in 120Sn

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...

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Veröffentlicht in:	Physics letters. B 2015-05, Vol.744, p.7-12
Hauptverfasser:	Krumbholz, A.M., von Neumann-Cosel, P., Hashimoto, T., Tamii, A., Adachi, T., Bertulani, C.A., Fujita, H., Fujita, Y., Ganioglu, E., Hatanaka, K., Iwamoto, C., Kawabata, T., Khai, N.T., Krugmann, A., Martin, D., Matsubara, H., Neveling, R., Okamura, H., Ong, H.J., Poltoratska, I., Ponomarev, V.Yu, Richter, A., Sakaguchi, H., Shimbara, Y., Shimizu, Y., Simonis, J., Smit, F.D., Susoy, G., Thies, J.H., Suzuki, T., Yosoi, M., Zenihiro, J.
Format:	Artikel
Sprache:	eng
Schlagworte:	[formula omitted], [formula omitted] E1 strength below neutron threshold Relativistic Coulomb excitation
Online-Zugang:	Volltext
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Zusammenfassung:	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.
ISSN:	0370-2693 1873-2445
DOI:	10.1016/j.physletb.2015.03.023