Detectability of the supernova relic neutrinos and neutrino oscillation

被引:88
作者
Ando, S
Sato, K
Totani, T
机构
[1] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan
[2] Univ Tokyo, Res Ctr Early Universe, Bunkyo Ku, Tokyo 1130033, Japan
[3] Princeton Univ Observ, Princeton, NJ 08544 USA
[4] Natl Astron Observ, Div Theory, Mitaka, Tokyo 1818588, Japan
关键词
diffuse background; supernovae; neutrino oscillation;
D O I
10.1016/S0927-6505(02)00152-4
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We investigate the flux and the event rate of the supernova relic neutrino (SRN) background at the SuperKamiokande (SK) detector for various neutrino oscillation models with parameters inferred from recent experimental results. A realistic model of neutrino emission from supernova explosions and several models of the cosmic star formation history are adopted in the calculation. The number flux over entire energy range is found to be 11-15 cm(-2) s(-1). We discuss the detection possibility of SRN at SK, comparing this SRN flux with other background neutrinos in more detail than previous studies. Even though there is no energy window in which SRN is dominant, we might detect it as the distortion of the other background event. We found in the energy range 17-25 MeV the expected event rate at SK 0.4-0.8 yr(-1). In this range, ten-year observation might enable us to detect SRN signal (at one sigma level) in the case of LMA solar neutrino solution. We also investigate event rate at Sudbury Neutrino Observatory (SNO) and KamLAND. Although we can find energy window, the expected event rate is rather small (0.03 yr(-1) for SNO, 0.1 yr(-1) for KamLAND. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:307 / 318
页数:12
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