Nuclear structure insights into reactor antineutrino spectra

Sonzogni, A. A.; Johnson, Timothy D.; McCutchan, E. A.

doi:10.1103/physrevc.91.011301

Cited by 99 publications

(137 citation statements)

References 33 publications

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“…This list has been established with the summation method using the ingredients presented in [4,19]. It has been cross-checked by participants attending a TAGS consultants' meeting organized by the Nuclear Data Section of the International Atomic Energy Agency, to which Sonzogni et al have presented similar results [20]. A more extensive table was extracted from our summation calculations, in agreement with Sonzogni et al's results, and can be found in [21].…”

Section: Can Nuclear Data Help To Solve the Reactor Antineutrino Puzzle?supporting

confidence: 76%

“…More details of the analysis can be found in [15]. Figure 2 displays the ratios between the antineutrino spectra calculated using the results presented in [15], with respect to the data for 92 Rb decay used in [4] (thick red dashed-dotted line), [20] (green dotted line) and [17] (black dashed line), assuming they would all use the same fission yields and the same beta decay data apart from the nucleus of interest. In this way, we compare only the beta decay properties of the nucleus involved.…”

Section: Results From Experiments At Jyväskylämentioning

confidence: 99%

“…In their calculation, the authors of [17] used 2. Ratio between the antineutrino spectra calculated using the latest TAGS results with respect to the data on 92 Rb decay used in [4] (thick red dashed-dotted line), in [20] (green dotted line) and in [17] (black dashed line). The sharp drop in the ratio, in one single bin located at the Q value of the 92 Rb, is due to the different values in Q given in [27] and E N S DF, that were used to reconstruct the antineutrino spectrum.…”

Section: Results From Experiments At Jyväskylämentioning

confidence: 99%

“…In this way, we compare only the beta decay properties of the nucleus involved. While [4] used the data from [20,27] used the latest version of the E N DF/B − V I I library. The two sets of data give very similar antineutrino spectra, which is why the impact of the new TAGS data on these two sets is almost the same (red and green lines superposed on the plots).…”

Section: Results From Experiments At Jyväskylämentioning

confidence: 99%

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Total absorption spectroscopy of fission fragments relevant for reactor antineutrino spectra

et al. 2017

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Abstract. The accurate determination of reactor antineutrino spectra remains a very active research topic for which new methods of study have emerged in recent years. Indeed, following the long-recognized reactor anomaly (measured antineutrino deficit in short baseline reactor experiments when compared with spectral predictions), the three international reactor neutrino experiments Double Chooz, Daya Bay and Reno have recently demonstrated the existence of spectral distortions in their measurements with respect to the same predictions. These spectral predictions were obtained through the conversion of integral beta-energy spectra obtained at the ILL research reactor. Several studies have shown that the underlying nuclear physics required for the conversion of these spectra into antineutrino spectra is not totally understood. An alternative to such converted spectra is a complementary approach that consists of determining the antineutrino spectrum by means of the measurement and processing of nuclear data. The beta properties of some key fission products suffer from the pandemonium effect which can be circumvented by the use of the Total Absorption Gammaray Spectroscopy technique (TAGS). The two main contributors to the Pressurized Water Reactor antineutrino spectrum in the region where the spectral distortion has been observed are 92 Rb and 142 Cs, which have been measured at the radioactive beam facility of the University of Jyväskylä in two TAGS experiments. We present the results of the analysis of the TAGS measurements of the β-decay properties of 92 Rb along with preliminary results on 142 Cs and report on the measurements already performed.

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Section: Can Nuclear Data Help To Solve the Reactor Antineutrino Puzzle?supporting

confidence: 76%

Section: Results From Experiments At Jyväskylämentioning

confidence: 99%

Section: Results From Experiments At Jyväskylämentioning

confidence: 99%

Section: Results From Experiments At Jyväskylämentioning

confidence: 99%

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Total absorption spectroscopy of fission fragments relevant for reactor antineutrino spectra

et al. 2017

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“…The latter approach, the summation method, was adopted by Fallot et al [7] and by Sonzogni et al [8] making full use of the experimental decay data (decay schemes) of individual FPs accumulated up to the present time.…”

Section: Introductionmentioning

confidence: 99%

Analysis of reactor-neutrino spectra fully based on gross theory of beta-decay emphasizing the special role of odd-odd FP nuclides

2017

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Abstract. We applied the gross theory of β-decay to calculate the reactor antineutrino (ν e ) spectra emitted from 235,238 U and 239,241 Pu samples under neutron irradiation by summing up all the contributions from a large number of decaying fission-products (FPs). Considering the special role of the odd(Z )-odd(N ) FPs in spectrum-shaping, we utilized the experimentally-known spin-parity of each odd-odd FP through the treatment proposed by Nakata, Tachibana and Yamada. Owing to this treatment, the consistency between calculated and experimental spectra was remarkably improved in a way expected from the nature of the gross theory of β-decay.

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