Neutron tagging following atmospheric neutrino events in a water Cherenkov detector

K Abe,T Mueller ,M Inomoto,L Ludovici,T Ishizuka,T Ishii,L F Thompson ,J Feng,Y Suzuki,K M Tsui ,S Watanabe,F D M Blaszczyk ,E Richard,G Mitsuka,D Wark,M Hartz,K.P Lee,F Di Lodovico,Y Nishimura,Ll Marti,K S Ganezer ,T Boschi,K Connolly,R Tacik,J G Bian ,K Yasutome,Y Oyama,Hiroshi Itô ,J Kameda,D Marin,T Horai,Sonia El Hedri ,B L Hartfiel ,T Towstego,G Pronost,M Goldhaber,I T Lim ,K Kaneyuki,K Sakashita,W R Kropp ,Hirohisa Tanaka ,W E Keig ,Taku Okada ,J Yang ,Y Koshio,K Sato ,John M Walker ,Y Zhang,K Ueno,S Cao,T Shiozawa,K Okumura,T Hiraki,D Hamabe,T Nakamura,D R Hadley ,S Matsuno,K Hiraide,D Barrow,T Yano,J G Learned ,X Li,B Jamieson,M B Smy ,K Nakamura,S Samani,M Miura,Y Kotsar,G Collazuol,Y Fukuda,Y Totsuka,Y Nagao,N Mccauley,M Ishitsuka,L N Machado ,T Mori,Fumihito Muto ,C W Walter ,A Takenaka,Erin O’sullivan ,S Ito,F Nova,L Sulak ,M Gonin,B Richards,O Drapier,Y Uchida,Ajmi Ali ,M Jakkapu,S Miki,K Tateishi,M Thiesse ,L Bernard,T Hasegawa,T Kayano,M Sakuda,C K Jung ,Bryan Zaldívar ,Miao Jiang ,K Choi,S Locke,S Nakayama,Toru Ishida ,H Ozaki,L Wan,J Xia,S Berkman,A A Cole ,K Iyogi,T Kobayashi,T Hayashino,Yuki Isobe ,J S Jang ,N Ospina,K Suzuki,K Martens,Hiroshi Kitagawa ,G Barr,Y Takeuchi,D Bravo-Berguño,S Chen,Y Kishimoto,Nguyễn Thị Hồng ,Takashi Sugimoto ,V Berardi,R J Wilkes ,J Imber,S Tobayama,G Carminati,S.B Kim,T Tsukamoto,C Simpson,Yuta Kato ,R Wang,T Tomura,Naoyuki Ogawa ,T Niwa,N D Patel ,Volodymyr Takhistov ,J Hill,C Yanagisawa,M O Wascko ,T Mochizuki,K Frankiewicz,L Cook,M Murdoch,S Izumiyama,B Bodur,P Fernåndez ,H Sekiya,N W Prouse ,Y Suda,T Wester,C Nantais ,A A Sztuc ,O Stone,M J Wilking ,E Radicioni,H W Sobel ,Kaoru Hagiwara ,B Quilain,T Kajita,Mathieu Lamoureux ,S Mine,G D Megías ,N J Griskevich ,I Kametani,J L Palomino ,J Mcelwee ,T Kikawa,Hiroshi Nagata ,Maria Gabriella Catanesi ,Chenyuan Xu ,A Renshaw,M Tsukada,R G Calland ,M Ikeda,K Ito,S Sussman,L H V Anthony ,T C Mclachlan ,J Hignight,Y Kuno,H Menjo,H Ishino,C Vilela,K Scholberg,Y Sonoda,Y Nakano,S N Smith ,Y Takahira,Y Haga,J L Raaf ,J Migenda,M Elnimr,Jin-Liang Jiang ,F Iacob,R P Litchfield ,G Santucci,M R Vagins ,Sentaro Takahashi ,Yongwoon Choi ,T Sekiguchi,T J Irvine ,T Akiri,E Kearns,P De Perio,W Ma,M Taani,G Pintaudi,M Shiozawa,Y Maekawa,S Tasaka,B W Pointon ,Masayuki Harada ,T Tashiro,N F Calabria ,C Kachulis,R.G Park,A Himmel,M Yokoyama,K Nishijima,Y Takemoto,M Friend,P Mijakowski,Yosuke Ashida ,R Yamaguchi,K Iwamoto,M Shinoki,H Okazawa,R Akutsu,N Piplani,T Yoshida,T Wongjirad,M Malek,Ken‐Ichi Okamoto ,A Pritchard,M Mori,S Zsoldos,S Hirota,R Wendell ,Y Kataoka,Y Kanemura,A Goldsack,M Posiadała-Zezula ,Tetsuo Nakajima ,S Molina Sedgwick,A Orii,Poonam Mehta ,P Weatherly,A K Ichikawa ,P Paganini,L Labarga,J L Amey ,R A Intonti ,I Yu,T Suzuki,Masayuki Tanaka ,Y Okajima,Y Itow,M Hasegawa,T Nakaya,S Sakai,J F Martin ,M Kuze,C Bronner,A Minamino,S Moriyama,Atsushi Takeda ,S J Jenkins ,J L Stone ,T Nakadaira,Y Hayato,Daisuke Fukuda ,B D Xu ,M Koshiba,Shuji Yamamoto ,Akihiro Suzuki ,Akira Murakami ,M Nakahata,A Coffani,Z Li,Takahiko Matsubara ,Kouji Ohta ,M Murase,S Han,Yoshikazu Nakajima ,H Miyabe,K Ieki,S Sano,A Giampaolo,J.Y Kim,J Gustafson,S Imaizumi,R Matsumoto,G De Rosa,A Kibayashi,T Yokozawa,K Huang,A Konaka,R Sasaki

doi:10.1088/1748-0221/17/10/p10029

Abstract

We present the development of neutron-tagging techniques in Super-Kamiokande IV using a neural network analysis. The detection efficiency of neutron capture on hydrogen is estimated to be 26%, with a mis-tag rate of 0.016 per neutrino event. The uncertainty of the tagging efficiency is estimated to be 9.0%. Measurement of the tagging efficiency with data from an Americium-Beryllium calibration agrees with this value within 10%. The tagging procedure was performed on 3,244.4 days of SK-IV atmospheric neutrino data, identifying 18,091 neutrons in 26,473 neutrino events. The fitted neutron capture lifetime was measured as 218±9 μs.

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