investigating the spectral anomaly with different reactor antineutrino experiments

menyelidiki anomali spektral dengan eksperimen antineutrino reaktor yang berbeda

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ID: 198741
2017
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Abstract
The spectral shape of reactor antineutrinos measured in recent experiments shows anomalies in comparison to neutrino reference spectra. New precision measurements of the reactor neutrino spectra as well as more complete input in nuclear data bases are needed to resolve the observed discrepancies between models and experimental results. This article proposes the combination of experiments at reactors which are highly enriched in U235 with commercial reactors with typically lower enrichment to gain new insights into the origin of the anomalous neutrino spectrum. The presented method clarifies, if the spectral anomaly is either solely or not at all related to the predicted U235 spectrum. Considering the current improvements of the energy scale uncertainty of present-day experiments, a significance of three sigma and above can be reached. As an example, we discuss the option of a direct comparison of the measured shape in the currently running Double Chooz near detector and the upcoming Stereo experiment. A quantitative feasibility study emphasizes that a precise understanding of the energy scale systematics is a crucial prerequisite in recent and next generation experiments investigating the spectral anomaly.
Bentuk spektral antineutrino reaktor yang diukur dalam eksperimen-eksperimen terkini menunjukkan anomali jika dibandingkan dengan spektrum referensi neutrino. Pengukuran presisi baru terhadap spektrum neutrino reaktor serta masukan yang lebih lengkap pada basis data nuklir diperlukan untuk menyelesaikan diskrepansi yang teramati antara model dan hasil eksperimen. Artikel ini mengusulkan penggabungan eksperimen pada reaktor dengan pengayaan U235 tinggi dan reaktor komersial yang umumnya memiliki tingkat pengayaan lebih rendah guna memperoleh wawasan baru mengenai asal-usul spektrum neutrino anomali tersebut. Metode yang disajikan menjelaskan apakah anomali spektral tersebut semata-mata terkait atau sama sekali tidak terkait dengan spektrum U235 yang diprediksi. Dengan mempertimbangkan perbaikan ketidakpastian skala energi pada eksperimen-eksperimen saat ini, tingkat signifikansi tiga sigma ke atas dapat dicapai. Sebagai contoh, kami membahas opsi perbandingan langsung antara bentuk spektral yang diukur pada detektor dekat Double Chooz yang saat ini beroperasi dengan eksperimen Stereo yang akan datang. Studi kelayakan kuantitatif menegaskan bahwa pemahaman yang presisi mengenai sistematika skala energi merupakan prasyarat krusial dalam eksperimen generasi terkini maupun generasi berikutnya yang menyelidiki anomali spektral tersebut.
A forma espectral de antineutrinos de reatores medida em experimentos recentes apresenta anomalias em comparação com os espectros de referência de neutrinos. Novas medições de precisão dos espectros de neutrinos de reatores, bem como dados de entrada mais completos em bases de dados nucleares, são necessários para resolver as discrepâncias observadas entre modelos e resultados experimentais. Este artigo propõe a combinação de experimentos em reatores altamente enriquecidos em U235 com reatores comerciais de enriquecimento tipicamente inferior para obter novas perspectivas sobre a origem do espectro anômalo de neutrinos. O método apresentado esclarece se a anomalia espectral está exclusivamente ou de forma alguma relacionada ao espectro previsto do U235. Considerando as melhorias atuais na incerteza da escala de energia dos experimentos atuais, uma significância de três sigmas ou superior pode ser alcançada. Como exemplo, discutimos a opção de uma comparação direta da forma medida no detector próximo do Double Chooz, atualmente em operação, e no futuro experimento Stereo. Um estudo quantitativo de viabilidade enfatiza que uma compreensão precisa da sistemática da escala de energia é um pré-requisito crucial em experimentos recentes e de próxima geração que investigam a anomalia espectral.
Reference Key
buck2017physicsinvestigating Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;C. Buck;A.P. Collin;J. Haser;M. Lindner
Journal ACS chemical biology
Year 2017
DOI
10.1016/j.physletb.2016.11.062
URL
http://www.sciencedirect.com/science/article/pii/S0370269316307456
Keywords
neutrino antineutrino

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