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arXiv 1101.2663hep-exnucl-ex
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反应堆反中微子谱的改进预测

Improved Predictions of Reactor Antineutrino Spectra

Th. A. Mueller, D. Lhuillier, M. Fallot, A. Letourneau, S. Cormon, M. Fechner, L. Giot, T. Lasserre, J. Martino, G. Mention, A. Porta, F. Yermia

备注：
17 pages, 12 figures. Submitted to Phys. Rev. C
发表信息：
Phys.Rev.C83:054615,2011
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摘要：

我们报告新的计算反应堆反中微子光谱，包括核数据库的最新信息和详细的误差预算。这项工作的第一部分是所谓的从头算方法，其中总的反中微子光谱是由进化代码预测的所有裂变产物的所有β分支的总和建立的。核数据库中的系统效应和缺失信息导致最终的相对不确定性在10%至20%的范围内。基于这种从头算方法，给出了与238 U裂变有关的反中微子能谱的预测。对于主要同位素235 U和239 Pu，我们开发了一种更准确的方法，将核数据库中的信息与80年代在ILL测量的与235 U，239 Pu和241 Pu裂变相关的参考电子光谱相结合。我们展示了如何测量的总β谱的锚点可以用来抑制核数据库中的不确定性，同时利用它们包含的所有信息。我们提供了235 U、239 Pu和241 Pu同位素在2-8 MeV范围内的新的参考反中微子谱。虽然光谱的形状及其不确定性与先前对ILL数据的分析相当，但归一化平均偏移约+3%。从重新分析过去的实验和直接使用这些结果的角度来看，即将到来的振荡实验，我们讨论了各种来源的误差和它们的相关性，以及由偏离平衡效应引起的校正。

英文摘要：

We report new calculations of reactor antineutrino spectra including the latest information from nuclear databases and a detailed error budget. The first part of this work is the so-called ab initio approach where the total antineutrino spectrum is built from the sum of all beta-branches of all fission products predicted by an evolution code. Systematic effects and missing information in nuclear databases lead to final relative uncertainties in the 10 to 20% range. A prediction of the antineutrino spectrum associated with the fission of 238U is given based on this ab initio method. For the dominant isotopes 235U and 239Pu, we developed a more accurate approach combining information from nuclear databases and reference electron spectra associated with the fission of 235U, 239Pu and 241Pu, measured at ILL in the 80's. We show how the anchor point of the measured total beta-spectra can be used to suppress the uncertainty in nuclear databases while taking advantage of all the information they contain. We provide new reference antineutrino spectra for 235U, 239Pu and 241Pu isotopes in the 2-8 MeV range. While the shapes of the spectra and their uncertainties are comparable to that of the previous analysis of the ILL data, the normalization is shifted by about +3% on average. In the perspective of the re-analysis of past experiments and direct use of these results by upcoming oscillation experiments, we discuss the various sources of errors and their correlations as well as the corrections induced by off equilibrium effects.

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