Study of high energy atmospheric and astrophysical neutrinos by a large water Cherenkov detector

利用大型水切伦科夫探测器研究高能大气和天体物理中微子

• 批准号: 17340073
• 负责人: ITOW Yoshitaka
• 金额: $ 8.51万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17340073/
• 关键词: neutrino; cosmic ray physics; underground experiment; particle astrophysics; water Cherenkov detector; high energy astronomy; Super-Kamiokande; dark matter; 暗黒物質

1) We have established a new method to reconstruct visible energy of fully-contained (FC) events at SK by using PMT pulse shape information recorded by FADC. We applied this method to SK2 FC atmospheric neutrino sample and found conventional visible energy using ADC was underestimated by about factor 2 at most because of overflow of ADC.2) We have made an enriched sample of charged current nue interactions in SK2 FC atmospheric neutrino sample by applying several cuts and obtained a correct energy distribution of atmospheric nue based on FADC data. This is the first measurement of energy spectrum of atmospheric nue in the multi-10th energy region after the FREJUS experiment did at below 10 GeV. No event was found in more than 100 GeV region. It is consistent with 0.3 expected from atmospheric nue flux calculation.3) These results shown above was summarized in a master thesis of Nagoya University (T. Koike 2006) and reported in JPS meetings in autumn 06 and spring 07.4) Calibration work of FADC for SK2 and SK3 was done. Analysis program and MC codes for FADC were improved5) Design study of improved FADC trigger for up-going muon candidates. We leaned it requires substantial change in DAQ electronics of the outer detector of Super-Kamiokande.6) Linearity of 20-inch PMT used in the SK inner detector at very high photon input was tested by using a very fast timing pulsed N2 laser system. We observe it shows good linearity up to 700 p.e. at input.7) Neutrinos from the largest flare of SGR1806-20 at Dec27, 2005 were searched and reported in ICRC2005. We also have studied astrophysical neutrinos by using up-going muon events and published papers in refereed journals and conference proceedings. Also we have studied identification of nutau charged current events and nue charged current events related to this work. They were also published.

1)我们建立了一种利用FADC记录的PMT脉冲形状信息重建SK全包含子(FC)事件可见光能量的新方法。我们将这种方法应用于SK2FC大气中微子样品，发现由于ADC.2的溢出，使用ADC的常规可见光能量最多被低估了约2倍。)我们通过多次切割使SK2FC大气中微子样品的带电电流NUE相互作用得到了丰富的样本，并根据FADC数据得到了正确的大气NUE能量分布。这是继Frejus实验在10GeV以下进行大气NUE能谱测量之后，首次在10GeV以下的能区测量大气NUE的能谱。在超过100GeV的区域内未发现地震。3)上述结果在名古屋大学(T.Koike 2006)的一篇硕士论文中进行了总结，并在2006年秋季和2007年春季的JPS会议上进行了报告。改进了FADC分析程序和MC代码。5)改进的上行介子候选FADC触发器的设计研究。我们认为这需要对Super-Kamiokande外探测器的DAQ电子学进行实质性的改变。6)利用非常快的定时脉冲N_2激光系统测试了SK内探测器中使用的20英寸光电倍增管在极高光子输入下的线性度。我们观察到它在700pE以下表现出良好的线性。在输入时，搜索并报告了2005年12月27日SGR1806-20最大耀斑的中微子。我们还利用上行的Muon事件研究了天体物理中微子，并在相关期刊和会议记录上发表了论文。此外，我们还研究了与这项工作相关的Nue带电海流事件和Nutau带电海流事件的识别。它们也被出版了。

项目成果

High-Energy Neutrino Astronomy Using Upward-going Muons in Super-Kamiokande I

• DOI: 10.1086/508016
• 发表时间: 2006-06
• 期刊: The Astrophysical Journal
• 作者: K. Abe;J. Hosaka;T. Iida;K. Ishihara;J. Kameda;Y. Koshio;A. Minamino;C. Mitsuda;M. Miura;S. Moriyama;M. Nakahata;Y. Obayashi;H. Ogawa;M. Shiozawa;Y. Suzuki;A. Takeda;Y. Takeuchi;I. Higuchi;C. Ishihara;M. Ishitsuka;T. Kajita;K. Kaneyuki;G. Mitsuka;S. Nakayama;H. Nishino;A. Okada;K. Okumura;C. Saji;Y. Takenaga;S. Clark;S. Desai;F. Dufour;E. Kearns;S. Likhoded;M. Litos;J. Raaf;J. Stone;L. Sulak;W. Wang;M. Goldhaber;D. Casper;J. P. Cravens;J. Dunmore;W. Kropp;D. Liu;S. Mine;C. Regis;M. Smy;H. Sobel;M. Vagins;K. Ganezer;J. Hill;W. Keig;J. Jang;J. Kim;I. Lim;K. Scholberg;N. Tanimoto;C. Walter;R. Wendell;R. Ellsworth;S. Tasaka;G. Guillian;J. Learned;S. Matsuno;M. Messier;Y. Hayato;A. Ichikawa;T. Ishida;T. Ishii;T. Iwashita;T. Kobayashi;T. Nakadaira;K. Nakamura;K. Nitta;Y. Oyama;Y. Totsuka;A. Suzuki;M. Hasegawa;K. Hiraide;I. Kato;H. Maesaka;T. Nakaya;K. Nishikawa;T. Sasaki;H. Sato;S. Yamamoto;M. Yokoyama;T. Haines;S. Dazeley;S. Hatakeyama;R. Svoboda;G. Sullivan;D. Turcan;M. Swanson;A. Clough;A. Habig;Y. Fukuda;T. Sato;Y. Itow;T. Koike;C. Jung;T. Kato;K. Kobayashi;M. Malek;C. Mcgrew;A. Sarrat;R. Terri;C. Yanagisawa;N. Tamura;M. Sakuda;M. Sugihara;Y. Kuno;M. Yoshida;S. Kim;B. Yang;J. Yoo;T. Ishizuka;H. Okazawa;Y. Choi;H. K. Seo;Y. Gando;T. Hasegawa;K. Inoue;H. Ishii;K. Nishijima;H. Ishino;Y. Watanabe;M. Koshiba;D. Kiełczewska;J. Zalipska;H. Berns;R. Gran;K. Shiraishi;A. Stachyra;E. Thrane;K. Washburn;R. Wilkes

A measurement of atmospheric neutrino flux consistent with tau neutrino appearance

与 tau 中微子外观一致的大气中微子通量测量

• 发表时间: 2006
• 期刊: Physical Review Letters 97
• 作者: K.Nakajima;K.Inoue;K.Owada;F.Suekane;A.Suzuki 他4名;T.Araki et al.;K.Abe et al.[Super-Kamiokande Collaboration]
• 通讯作者: K.Abe et al.[Super-Kamiokande Collaboration]

Three flavor neutrino oscillation analysis of atmospheric neutrinos in Super-Kamiokande

• DOI: 10.1103/physrevd.74.032002
• 发表时间: 2006-08
• 期刊: Physical Review D
• 影响因子: 5
• 作者: J. Hosaka;K. Ishihara;J. Kameda;Y. Koshio;A. Minamino;C. Mitsuda;M. Miura;S. Moriyama;M. Nakahata;T. Namba;Y. Obayashi;M. Shiozawa;Y. Suzuki;A. Takeda;Y. Takeuchi;S. Yamada;I. Higuchi;M. Ishitsuka;T. Kajita;K. Kaneyuki;G. Mitsuka;S. Nakayama;H. Nishino;A. Okada;K. Okumura;C. Saji;Y. Takenaga;S. Clark;S. Desai;E. Kearns;S. Likhoded;J. Stone;L. Sulak;W. Wang;M. Goldhaber;D. Casper;J. P. Cravens;W. Kropp;D. Liu;S. Mine;C. Regis;M. Smy;H. Sobel;C. Sterner;M. Vagins;K. Ganezer;J. Hill;W. Keig;J. Jang;J. Kim;I. Lim;K. Scholberg;C. Walter;R. Wendell;R. Ellsworth;S. Tasaka;E. Guillian;A. Kibayashi;J. Learned;S. Matsuno;M. Messier;Y. Hayato;A. Ichikawa;T. Ishida;T. Ishii;T. Iwashita;T. Kobayashi;T. Nakadaira;K. Nakamura;K. Nitta;Y. Oyama;Y. Totsuka;A. Suzuki;M. Hasegawa;I. Kato;H. Maesaka;T. Nakaya;K. Nishikawa;Takanori Sasaki;H. Sato;S. Yamamoto;M. Yokoyama;T. Haines;S. Dazeley;S. Hatakeyama;R. Svoboda;E. Blaufuss;J. Goodman;G. Sullivan;D. Turcan;J. Cooley;A. Habig;Y. Fukuda;T. Sato;Y. Itow;C. Jung;T. Kato;K. Kobayashi;M. Małek;C. Mauger;C. Mcgrew;A. Sarrat;C. Yanagisawa;N. Tamura;M. Sakuda;Y. Kuno;M. Yoshida;S. Kim;J. Yoo;T. Ishizuka;H. Okazawa;Y. Choi;H. Seo;Y. Gando;T. Hasegawa;K. Inoue;J. Shirai;A. Suzuki;K. Nishijima;H. Ishino;Y. Watanabe;M. Koshiba;D. Kiełczewska;J. Zalipska;H. Berns;R. Gran;K. Shiraishi;A. Stachyra;K. Washburn;R. Wilkes

High energy neutrino astronomy using upward-going muons in Super-Kamiokande-l.

使用 Super-Kamiokande-l 中向上运动的 μ 子进行高能中微子天文学。

• 发表时间: 2006
• 期刊: Astrophysical Journal 652
• 作者: Abe;F;Muraki;Y;Molly E.C.Swanson et al.;K.Abe et al.
• 通讯作者: K.Abe et al.

Search for Diffuse Astrophysical Neutrino Flux Using Ultrahigh Energy Upward-Going Muons in Super-Kamiokande l.

使用 Super-Kamiokande l 中的超高能向上运动 μ 子搜索弥散天体物理中微子通量。

• 发表时间: 2006
• 期刊: Astrophysical Journal 652
• 作者: Abe;F;Muraki;Y;Molly E.C.Swanson et al.
• 通讯作者: Molly E.C.Swanson et al.