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Updated: Aug 2, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
Published on: December 18, 2015
Parity measurements of nuclear levels using a free-electron-laser generated gamma-ray beam
N Pietralla1, Z Berant, V N Litvinenko
1A.W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, USA.
Abstract:
The quality and intensity of gamma rays at the High Intensity gamma-ray Source are shown to make nuclear resonance fluorescence studies possible at a new level of precision and efficiency. First experiments have been carried out using an intense (10(7) gamma/s) beam of 100% linearly polarized, nearly monoenergetic, gamma rays on the semimagic nucleus (138)Ba. Negative parity quantum numbers have been assigned to 18 dipole excitations of (138)Ba between 5.5 MeV and 6.5 MeV from azimuthal gamma-intensity asymmetries.
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