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. 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
DOIAbstract
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. Keywords: Sn120(p,p′), Ep=295 MeV, Relativistic Coulomb excitation, E1 strength below neutron threshol
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