arXiv:1502.04305·v3·Nuclear Experiment
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🇯🇵
Abstract
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.
Comments: 7 pages, 6 figures