Diffuse Supernova Neutrino Background Search at Super-Kamiokande

被引：0
|
作者：
El Hedri, S. [1 ]
Ashida, Y. [2 ]
Giampaolo, A.
机构：
[1] Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91120 Palaiseau, France
[2] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan
来源：
37TH INTERNATIONAL COSMIC RAY CONFERENCE, ICRC2021 | 2022年
关键词：
D O I：
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中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the results of a search for the Diffuse Supernova Neutrino Background (DSNB) at Super-Kamiokande (SK) that incorporates 22.5 x 2970 kton.days of data from its fourth data-taking phase. Two analyses, with different energy regimes covering the 9.3-81.3 MeV antineutrino energy range, have been developed based on previous SK searches, with substantially improved background modeling and data reduction techniques. Moreover, a combined analysis of nearly 20 years of SK data (1996-2018) has been performed, with a 90% C.L. sensitivity to the DSNB flux comparable to various DSNB predictions. No significant evidence for a DSNB signal has been observed, and both analyses set world-leading limits on the DSNB flux that can reach about 2.7 (nu) over bar (e).cm(-2).s(-1) for a wide range of models.
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页数：9
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