Radiative thermal neutron-capture cross sections for the W180(n,γ) reaction and determination of the neutron-separation energy

A. M. Hurst, R. B. Firestone, L. Szentmiklósi, B. W. Sleaford, M. S. Basunia, T. Belgya, J. E. Escher, M. Krtička, Zs. Révay, and N. C. Summers
Phys. Rev. C 92, 034615 – Published 24 September 2015

Abstract

Prompt thermal neutron-capture partial γ-ray production cross sections were measured for the first time for the W180(n,γ) reaction using a cold guided-neutron beam at the Budapest Research Reactor. Absolute W181γ-ray cross sections were internally standardized using well-known comparator γ-ray cross sections belonging to the other tungsten isotopes present in the 11.35% enriched W180 sample. Transitions were assigned to levels in W181 based largely upon information available in the literature. The total radiative thermal neutron-capture cross section σ0 was determined from the sum of direct prompt γ-ray cross sections populating the ground state and a modeled contribution accounting for ground-state feeding from the quasicontinuum. In this work, we find σ0=21.67(77) b. A new measurement of the cross section for the 5/2 metastable isomer at 365.6 keV, σ5/2(181Wm,14.6μs)=19.96(55) b, is also determined. Additionally, primary γ rays, observed for the first time in the W180(n,γ) reaction, provide the most precise determination for the W181 neutron-separation energy, Sn=6669.02(16) keV.

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  • Received 6 August 2015
  • Revised 28 August 2015

DOI:https://doi.org/10.1103/PhysRevC.92.034615

©2015 American Physical Society

Authors & Affiliations

A. M. Hurst1,*, R. B. Firestone1, L. Szentmiklósi2, B. W. Sleaford3, M. S. Basunia1, T. Belgya2, J. E. Escher3, M. Krtička4, Zs. Révay2,5, and N. C. Summers3

  • 1Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 2Centre for Energy Research, Hungarian Academy of Sciences, H-1525 Budapest, Hungary
  • 3Lawrence Livermore National Laboratory, Livermore, California 94550, USA
  • 4Charles University in Prague, Faculty of Mathematics and Physics, CZ-180 00 Prague, Czech Republic
  • 5Technische Universität München, Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Garching, Germany

  • *AMHurst@lbl.gov

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Vol. 92, Iss. 3 — September 2015

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