@article{oai:repo.qst.go.jp:00047928,
 author = {エンジェル, クリストファー and 羽島, 良一 and 静間, 俊行 and Ludewigt, B. and B.J., Quiter and エンジェル クリストファー and 羽島 良一 and 静間 俊行},
 issue = {14},
 journal = {Physical Review Letters},
 month = {Sep},
 note = {In recent measurements of the scissors mode in radiative decay experiments, transition strengths were
observed that were double that expected from theory and systematics well established from measurements
on the radiative excitation channel, that is, using nuclear resonance fluorescence (NRF). Additional
strength as measured with NRF can only be present as heretofore unobserved branching or fragmentation
of the scissors mode. Such possibilities were investigated in a transmission NRF measurement on the
deformed, odd-mass 181Ta, using a quasimonoenergetic γ-ray beam at two beam energies. This
measurement further influences applications using transmission NRF to assay or detect odd-mass fissile
isotopes. A large branching, ≈75%, of small resonances to excited states was discovered. In contrast,
previous studies using NRF of the scissors-mode strength in odd-mass nuclei assumed no branching
existed. The presently observed branching, combined with the observed highly fragmented elastic strength,
could reconcile the scissors-mode strength observed in NRF measurements with the expectations for
enhanced scissors-mode strength from radiative decay experiments.},
 pages = {142501-1--142501-5},
 title = {Branching and fragmentation of dipole strength in  181Ta in the region of the scissors mode},
 volume = {117},
 year = {2016}
}