Late-time emission of prompt fission <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>γ</mi></math> rays from <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mmultiscripts><mi mathvariant="normal">U</mi><mprescripts></mprescripts><none></none><mn>235</mn></mmultiscripts><mo>(</mo><mi>n</mi><mo>,</mo><mi>f</mi><mo>)</mo></mrow></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mmultiscripts><mi>Cf</mi><mprescripts></mprescripts><none></none><mn>252</mn></mmultiscripts><mo>(</mo><mi>sf</mi><mo>)</mo></mrow></math>

G. Rusev; B. Baramsai; E. M. Bond; T. A. Bredeweg; A. Couture; J. M. O'Donnell; M. Jandel; A. E. Lovell; S. Mosby; C. J. Prokop; I. Stetcu; P. Talou; J. L. Ullmann

doi:10.1103/98lx-hpcd

Late-time emission of prompt fission $γ$ rays from ${}^{235}U (n, f)$ and ${}^{252}{Cf} (sf)$

G. Rusev ¹, B. Baramsai^1,*, E. M. Bond¹, T. A. Bredeweg ¹, A. Couture², J. M. O'Donnell², M. Jandel^1,3, A. E. Lovell ⁴, S. Mosby² et al.

C. J. Prokop², I. Stetcu ⁴, P. Talou ^5,6, and J. L. Ullmann²

¹Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
²Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
³Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA
⁴Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
⁵X Computational Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
⁶Stardust Science Labs, Santa Fe, New Mexico 87507, USA

^*Present address: Vantage Partners, NASA Glenn Research Center, Brook Park, Ohio 44142, USA.

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Phys. Rev. C 111, 064613 – Published 12 June, 2025

DOI: https://doi.org/10.1103/98lx-hpcd

Abstract

Measurements of fission $γ$ rays emitted as a function of time since fission from the ${}^{235}U (n, f)$ and ${}^{252}{Cf} (sf)$ reactions were carried out with the detectors array DANCE. A fission event was identified by registering a prompt fission neutron with the NEUANCE array placed inside DANCE and surrounding the target. All $γ$ rays, fission or background, following the fission events were recorded. Some of the background events were removed during the data reduction by applying multiplicity and total $γ$ -ray energy cuts. A method for estimating the accidental $γ$ -ray background was applied to clean the data from the remaining background. Energy spectra of the fission $γ$ rays were collected as a function of the time since fission occurred. The experimental results are compared with predictions of the CGMF code folded with GEANT4 simulations of the DANCE with NEUANCE detector response.

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Late-time emission of prompt fission $γ$ rays from ${}^{235}U (n, f)$ and ${}^{252}{Cf} (sf)$

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Late-time emission of prompt fission γ rays from U235(n,f) and Cf252(sf)

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Late-time emission of prompt fission $γ$ rays from ${}^{235}U (n, f)$ and ${}^{252}{Cf} (sf)$