Spectral anomaly of reactor antineutrinos based on theoretical energy spectra

Tadashi Yoshida, Takahiro Tachibana, Shin Okumura, Satoshi Chiba

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

There exists a persistent local deviation in the reactor antineutrino spectra between those measured directly at power reactors through the νe+p→n+e+ reaction and the currently used reference data. In order to interpret the origin of this spectral anomaly with its peak at 6 MeV, the gross theory of β decay was applied to calculate the antineutrino spectra for about 500 fission products (FPs) where the measured spin parities were introduced into calculations for 178 odd(-N)-odd(-Z) FPs in the framework of the gross theory and the recently measured ground-to-ground transition rate for two FPs dominating the spectrum shaping above 5 MeV. The overall consistency between the calculated and the reference spectra is reasonable, and our result supports the direct measurements of the νe spectra at power reactors. The anomaly is suggested to originate first with the plutonium isotopes Pu239 and Pu241, which are closely followed by U235.

Original languageEnglish
Article number041303
JournalPhysical Review C
Volume98
Issue number4
DOIs
Publication statusPublished - 2018 Oct 29

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antineutrinos
energy spectra
reactors
fission products
anomalies
power reactors
plutonium isotopes
parity
deviation
decay

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Spectral anomaly of reactor antineutrinos based on theoretical energy spectra. / Yoshida, Tadashi; Tachibana, Takahiro; Okumura, Shin; Chiba, Satoshi.

In: Physical Review C, Vol. 98, No. 4, 041303, 29.10.2018.

Research output: Contribution to journalArticle

Yoshida, Tadashi ; Tachibana, Takahiro ; Okumura, Shin ; Chiba, Satoshi. / Spectral anomaly of reactor antineutrinos based on theoretical energy spectra. In: Physical Review C. 2018 ; Vol. 98, No. 4.
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