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Low-energy electric dipole response in 120Sn

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arxiv 1502.04305 v3 pith:JAVUM4MC submitted 2015-02-15 nucl-ex nucl-th

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
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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. Poltoratska V.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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The electric dipole strength in 120Sn has been extracted from proton inelastic scattering experiments at E_p = 295 MeV and at forward angles including 0 degree. Below neutron threshoild it differs from the results of a 120Sn(gamma,gamma') 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 (gamma,gamma') reaction. This implies a strong fragmentation of the E1 strength and/or small ground state branching ratios of the excited 1- states.

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