BibTex format
@article{Abe:2026:1538-4357/ae6c20,
author = {Abe, K and Abe, S and Asaoka, Y and Harada, M and Hayato, Y and Hiraide, K and Hosokawa, K and Hung, TH and Ieki, K and Ikeda, M and Kameda, J and Kanemura, Y and Kataoka, Y and Miki, S and Mine, S and Miura, M and Moriyama, S and Nakahata, M and Nakayama, S and Noguchi, Y and Pronost, G and Sato, K and Sekiya, H and Shinoda, R and Shiozawa, M and Suzuki, Y and Takeda, A and Takemoto, Y and Tanaka, H and Yano, T and Itow, Y and Kajita, T and Nishijima, R and Okumura, K and Tashiro, T and Tomiya, T and Wang, X and Fernandez, P and Labarga, L and Samudio, D and Zaldivar, B and Yanagisawa, C and Kearns, E and Mirabito, J and Wan, L and Wester, T and Pointon, BW and Bian, J and Cortez, B and Griskevich, NJ and Jiang, Y and Smy, MB and Sobel, HW and Takhistov, V and Yankelevich, A and Hill, J and Jang, MC and Lee, SH and Moon, DH and Park, RG and Yang, BS and Bodur, B and Scholberg, K and Walter, CW and Beauch锚ne, A and Le, Bl茅vec E and Drapier, O and Ershova, A and Ferey, M and Mueller, TA},
doi = {1538-4357/ae6c20},
journal = {Astrophysical Journal},
title = {Search for Diffuse Supernova Neutrino Background with 956.2 Days of Super-Kamiokande Gadolinium Dataset},
url = {http://dx.doi.org/10.3847/1538-4357/ae6c20},
volume = {1005},
year = {2026}
}
RIS format (EndNote, RefMan)
TY - JOUR
AB - We report the search result for the Diffuse Supernova Neutrino Background (DSNB) in neutrino energies beyond 9.3 MeV in the gadolinium-loaded Super-Kamiokande (SK) detector with a 22,500 × 956.2 m<sup>3</sup> day exposure. Starting in the summer of 2020, SK introduced 0.01% gadolinium (Gd) by mass into its ultrapure water to enhance the neutron capture signal, termed the SK-VI phase. This was followed by a 0.03% Gd-loading in 2022, a phase referred to as SK-VII. We then conducted a DSNB search using 552.2 days of SK-VI data and 404.0 days of SK-VII data through 2023 September. This analysis includes several new features, such as two new machine learning neutron detection algorithms with Gd, an improved atmospheric background-reduction technique, and two parallel statistical approaches. No significant excess over background predictions was found in a DSNB spectrum-independent analysis, and 90% confidence level (C.L.) upper limits on the astrophysical electron antineutrino flux were set. Additionally, a spectral fitting result exhibited a ∼1.2σ disagreement with a null DSNB hypothesis, comparable to a previous result from 5823 days of all SK pure-water phases.
AU - Abe,K
AU - Abe,S
AU - Asaoka,Y
AU - Harada,M
AU - Hayato,Y
AU - Hiraide,K
AU - Hosokawa,K
AU - Hung,TH
AU - Ieki,K
AU - Ikeda,M
AU - Kameda,J
AU - Kanemura,Y
AU - Kataoka,Y
AU - Miki,S
AU - Mine,S
AU - Miura,M
AU - Moriyama,S
AU - Nakahata,M
AU - Nakayama,S
AU - Noguchi,Y
AU - Pronost,G
AU - Sato,K
AU - Sekiya,H
AU - Shinoda,R
AU - Shiozawa,M
AU - Suzuki,Y
AU - Takeda,A
AU - Takemoto,Y
AU - Tanaka,H
AU - Yano,T
AU - Itow,Y
AU - Kajita,T
AU - Nishijima,R
AU - Okumura,K
AU - Tashiro,T
AU - Tomiya,T
AU - Wang,X
AU - Fernandez,P
AU - Labarga,L
AU - Samudio,D
AU - Zaldivar,B
AU - Yanagisawa,C
AU - Kearns,E
AU - Mirabito,J
AU - Wan,L
AU - Wester,T
AU - Pointon,BW
AU - Bian,J
AU - Cortez,B
AU - Griskevich,NJ
AU - Jiang,Y
AU - Smy,MB
AU - Sobel,HW
AU - Takhistov,V
AU - Yankelevich,A
AU - Hill,J
AU - Jang,MC
AU - Lee,SH
AU - Moon,DH
AU - Park,RG
AU - Yang,BS
AU - Bodur,B
AU - Scholberg,K
AU - Walter,CW
AU - Beauch锚ne,A
AU - Le,Bl茅vec E
AU - Drapier,O
AU - Ershova,A
AU - Ferey,M
AU - Mueller,TA
AU - Santos,AD
AU - Paganini,P
AU - Quach,C
AU - Rogly,R
AU - Nakamura,T
AU - Jang,JS
AU - Litchfield,RP
AU - Machado,LN
AU - Soler,FJP
AU - Learned,JG
AU - Choi,K
AU - Cao,S
AU - Anthony,LHV
AU - Prouse,NW
AU - Scott,M
AU - Uchida,Y
AU - Berardi,V
AU - Calabria,NF
AU - Catanesi,MG
AU - Ospina,N
AU - Radicioni,E
AU - Langella,A
AU - De,Rosa G
AU - Collazuol,G
AU - Feltre,M
AU - Mattiazzi,M
AU - Ludovici,L
AU - Gonin,M
AU - P茅riss茅,L
AU - Quilain,B
DO - 1538-4357/ae6c20
PY - 2026///
SN - 0004-637X
TI - Search for Diffuse Supernova Neutrino Background with 956.2 Days of Super-Kamiokande Gadolinium Dataset
T2 - Astrophysical Journal
UR - http://dx.doi.org/10.3847/1538-4357/ae6c20
VL - 1005
ER -