Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session FG: Compton Scattering and Related Phenomena
9:00 AM–11:00 AM,
Friday, October 26, 2018
Hilton
Room: King's 3
Chair: William J. Briscoe, George Washington University
Abstract ID: BAPS.2018.HAW.FG.1
Abstract: FG.00001 : Exploratory study of the 180mTa(γ,γ')180Ta reaction with mono-energetic low-energy photon beams at HIγS
9:00 AM–9:15 AM
Presenter:
Werner Tornow
(Duke University and TUNL)
Authors:
Werner Tornow
(Duke University and TUNL)
Megha M. Bhike
(Duke University and TUNL)
Sean W Finch
(Duke University and TUNL)
FNU Krishichayan
(Duke University and TUNL)
For the first time the de-excitation cross section of the isomeric-state nuclide 180mTa has been measured with mono-energetic photon beams in the 1.56 MeV to 3.70 MeV energy range. The measurement of this inelastic scattering cross section on nature's rarest isotope was performed at eight energies at the High-Intensity Gamma-Ray Source facility with natural tantalum targets. After irradiation for typically 20 hours with photon fluxes ranging from 0.3 x 107 γ/(cm2×s) to 3.2 x 107 γ/(cm2×s), the 180mTa de-excitation cross section was obtained from the yield of the Kα1 and Kα2 X rays of 180Hf at 55.79 keV and 54.61 keV, respectively, produced after electron capture on the unstable 180Ta ground state. The cross-section values found vary between (1.9 ± 0.9) mb and (4.7 ± 2.4) mb, providing an astonishingly large cross section for the de-excitation of 180mTa. Extensive tests were performed to check on the reliability of the present data. The effect of bremsstrahlung photons of higher energy than the mono-energetic beam was carefully studied and corrected for.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.FG.1
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