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
TL;DR
This study investigates the low-energy electric dipole response in 120Sn using proton inelastic scattering, revealing a fragmented E1 strength significantly larger than previous gamma scattering measurements, indicating complex nuclear excitation behavior.
Contribution
First measurement of electric dipole strength in 120Sn via proton scattering, showing larger strength and fragmentation compared to gamma experiments.
Findings
E1 strength peaks at 8.3 MeV
Total strength is 2.3% of the sum rule
Strength is over three times larger than gamma results
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.
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Taxonomy
TopicsSuperconducting Materials and Applications · Advanced NMR Techniques and Applications · Solid-state spectroscopy and crystallography