Radiative thermal neutron-capture cross sections for the W 180 (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, N. C. Summers

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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.

Original languageEnglish
Article number034615
JournalPhysical Review C - Nuclear Physics
Volume92
Issue number3
DOIs
Publication statusPublished - Sep 24 2015

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thermal neutrons
absorption cross sections
rays
neutrons
cross sections
tungsten isotopes
energy
ground state
neutron beams
isomers
reactors

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Radiative thermal neutron-capture cross sections for the W 180 (n,γ) reaction and determination of the neutron-separation energy. / Hurst, A. M.; Firestone, R. B.; Szentmiklósi, L.; Sleaford, B. W.; Basunia, M. S.; Belgya, T.; Escher, J. E.; Krtička, M.; Révay, Zs; Summers, N. C.

In: Physical Review C - Nuclear Physics, Vol. 92, No. 3, 034615, 24.09.2015.

Research output: Contribution to journalArticle

Hurst, A. M. ; Firestone, R. B. ; Szentmiklósi, L. ; Sleaford, B. W. ; Basunia, M. S. ; Belgya, T. ; Escher, J. E. ; Krtička, M. ; Révay, Zs ; Summers, N. C. / Radiative thermal neutron-capture cross sections for the W 180 (n,γ) reaction and determination of the neutron-separation energy. In: Physical Review C - Nuclear Physics. 2015 ; Vol. 92, No. 3.
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