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Bethany L. Goldblum Berkeley Nuclear Research Center Department of Nuclear Engineering

Indirect determination of neutron capture cross sections on spherical and near-spherical nuclei using the surrogate method. Bethany L. Goldblum Berkeley Nuclear Research Center Department of Nuclear Engineering University of California, Berkeley. Nuclear Reactions Schematic.

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Bethany L. Goldblum Berkeley Nuclear Research Center Department of Nuclear Engineering

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  1. Indirect determination of neutron capture cross sections on spherical and near-spherical nuclei using the surrogate method Bethany L. Goldblum Berkeley Nuclear Research Center Department of Nuclear Engineering University of California, Berkeley

  2. Nuclear Reactions Schematic The Surrogate Method Direct Reaction Desired Reaction p 92Mo 92Mo n d 93Mo* Pn P 92Mo(d,p) 93Mo92Mo(n,) 94Mo(d,p) 95Mo 94Mo(n,)

  3. Absolute Surrogate Measurement Methodology Surrogate Ratio Measurement

  4. STARS-LiBerACE Experimental Methods • 11 MeV Deuteron Beam • 92Mo: • 460 ± 5 μg/cm2 • Target-DE spacing: 9 mm • 94Mo: • 250 ± 6 μg/cm2 • Target-DE spacing: 21 mm

  5. Discrete -ray Tagging Statistical -ray Tagging Identification of the number of g-cascades in coincidence with the surrogate reaction ejectile

  6. Discrete -ray Tagging Statistical -ray Tagging 93Mo: Epeak = 943 keV Ex = 8000-8100 keV Energy (keV) Identification of the number of g-cascades in coincidence with the surrogate reaction ejectile

  7. Discrete -ray Tagging Statistical -ray Tagging 93Mo: Eg = 6-7 MeV Ex = 8000-8100 keV Energy (keV) Identification of the number of g-cascades in coincidence with the surrogate reaction ejectile

  8. Absolute Surrogate Measurement 92Mo(n,g) Cross Section

  9. Surrogate Ratio Measurement 92Mo(n,g) Cross Section

  10. g-decay probability of 93Mo and 95Mo Evaluation of g-decay tagging techniques

  11. Ratio of the Statistical to Discrete Tag Evaluation of g-decay tagging techniques

  12. First use of the surrogate method in the indirect determination of neutron-induced reaction cross sections on spherical and quasi-spherical nuclei To improve the discrete tag, empirical data on nuclear level schemes could be used to sum parallel decay paths To improve the statistical tag, the g-ray energy range should be constrained to isolate primary g-transitions Discrete and statistical g-decay tags likely capture similar information for more deformed nuclei B.L. Goldblum, et al., Phys. Rev C 85, 054616 (2012). Conclusions

  13. M. Wiedeking, L.A. Bernstein, D.L. Bleuel, F.S. Dietrich, R. Hatarik, S.R. Lesher, N.D. Scielzo T. Reed K. Alfonso, R. Vial, J. Vujic J.M. Allmond P.T. Lake, I.-Y. Lee, S. Pachalis, M. Petri, L. Phair Collaborators

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