Study of collective dipole excitations below the giant dipole resonance at HIγS
Journal Article (Journal Article)
The High-Intensity Gamma-ray Source utilizing intra-cavity back-scattering of free electron laser photons from relativistic electrons allows one to produce a unique beam of high-flux gamma rays with 100% polarization and selectable energy and energy resolution which is ideal for low-energy γ-ray scattering experiments. Nuclear resonance fluorescence experiments have been performed on N=82 nuclei. High sensitivity studies of E1 and M1 excitations at energies close to the neutron emission threshold have been performed. The method allows the determination of excitation energies, spin, parities, and decay branching ratios of the pygmy dipole mode of excitation. The observations are compared with calculations using statistical and quasi-particle random-phase approximations. © 2007 American Institute of Physics.
Full Text
Duke Authors
Cited Authors
- Tonchev, AP; Angell, C; Boswell, M; Chyzh, A; Howell, CR; Karwowski, HJ; Kelley, JH; Tornow, W; Tsoneva, N; Wu, YK
Published Date
- April 4, 2007
Published In
Volume / Issue
- 891 /
Start / End Page
- 339 - 347
Electronic International Standard Serial Number (EISSN)
- 1551-7616
International Standard Serial Number (ISSN)
- 0094-243X
Digital Object Identifier (DOI)
- 10.1063/1.2713535
Citation Source
- Scopus