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Measurement of the prompt fission $$gamma$$-rays from slow neutron-induced fission of $$^{235}$$U with STEFF

Wright, T.*; Harada, Hideo   ; Kimura, Atsushi   ; 121 of others*

The average energy and multiplicity of prompt $$gamma$$-rays from slow neutron-induced fission of $$^{235}$$U have been measured using the STEFF spectrometer at the neutron time-of-flight facility n_TOF. The individual responses from 11 NaI scintillators were corrected for multiple $$gamma$$-ray interactions, prompt fission neutrons and background counts before being deconvolved to estimate the emitted spectrum of prompt fission $$gamma$$-rays. The results give an average $$gamma$$-ray energy $$bar{E}_{gamma}$$ of 1.71(5) MeV and multiplicity $$bar{nu}_{gamma}$$ of 2.66(18) considering $$gamma$$-rays emitted within the energy range from 0.8 to 6.8 MeV. The n_TOF data has a slightly larger $$bar{E}_{gamma}$$ and smaller $$bar{nu}_{gamma}$$ than other recent measurements, however the product of the two is in agreement within the quoted uncertainties.

Language

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English

Journal

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European Physical Journal A

Volume

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60

Number

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3

Pages

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p.70_1 - 70_11

Publication Year/Month

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2024/03

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Patent information

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Paper URL

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https://doi.org/10.1140/epja/s10050-024-01277-8

DOI for research data

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Link to research data related to this paper/report.

Keywords

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Prompt fission gamma-rays; Average energy; Multiplicity; $$^{235}$$U

Research Facility

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Press Release

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JAEA R&D Navigator

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Cooperating Institute

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CERN

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- Accesses

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Category:Physics, Nuclear

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