| Item type |
☆紀要論文 / Departmental Bulletin Paper(1) |
| 公開日 |
2015-03-19 |
| タイトル |
|
|
タイトル |
Spherically Statistical Tests on the Angular Distributions of Electrons of the IMB events associated with SN 1987A |
|
言語 |
en |
| 著者 |
Konishi, T.
Kitamura, T.
Chikawa, M.
Tsuji, K.
Nakatsuka, T.
Konishi, S.
|
| 言語 |
|
|
言語 |
eng |
| キーワード |
|
|
主題 |
PACS number, 97.GO.Bw, 14.60.Gh, 02.50.Cw |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
departmental bulletin paper |
| 著者(英) |
|
|
言語 |
en |
|
値 |
Konishi, T. |
| 著者(英) |
|
|
言語 |
en |
|
値 |
Kitamura, T. |
| 著者(英) |
|
|
言語 |
en |
|
値 |
Chikawa, M. |
| 著者(英) |
|
|
言語 |
en |
|
値 |
Tsuji, K. |
| 著者(英) |
|
|
言語 |
en |
|
値 |
Nakatsuka, T. |
| 著者(英) |
|
|
言語 |
en |
|
値 |
Konishi, S. |
| 著者 所属 |
|
|
値 |
Dept. of Physics & Math., Kinki University |
| 著者 所属 |
|
|
値 |
Research Institute for Science & Technology, Kinki University |
| 著者 所属 |
|
|
値 |
Research Institute for Science & Technology, Kinki University |
| 著者 所属 |
|
|
値 |
Dept. of Physics & Math., Kinki University |
| 著者 所属 |
|
|
値 |
Research Center for Information Sciences, Nagoya Women University |
| 著者 所属 |
|
|
値 |
Education Center for Information Processing, Tezukayama University |
| 著者所属(翻訳) |
|
|
値 |
近畿大学 |
| 著者所属(翻訳) |
|
|
値 |
近畿大学理工学総合研究所 |
| 著者所属(翻訳) |
|
|
値 |
近畿大学理工学総合研究所 |
| 著者所属(翻訳) |
|
|
値 |
近畿大学 |
| 著者所属(翻訳) |
|
|
値 |
名古屋女子大学 |
| 著者所属(翻訳) |
|
|
値 |
帝塚山大学 |
| 版 |
|
|
出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| 出版者 名前 |
|
|
出版者 |
近畿大学理工学総合研究所 |
| 書誌情報 |
理工学総合研究所研究報告
en : Annual reports by Research Institute for Science and Technology
巻 5,
p. 69-76,
発行日 1993-01-01
|
| ISSN |
|
|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
09162054 |
| 抄録 |
|
|
内容記述タイプ |
Abstract |
|
内容記述 |
[Abstract] Using various statistical methods, many investigators have claimed on the basis of the polar angle "cos θ" distribution of electrons from neutrinos emitted from SN 1987A that the IMB data seem to have a non-isotropic distribution, whereas the Kamiokande data show an isotropic distribution. They assert that it is difficult to explain the distribution only by the capture process: ν^^-_e+p→n+e^+. However, they do not seem to have succeeded in testing spherical distributions using both the polar and azimuthal angles because they calculate using only the polar angle while keeping the azimuthal angle uniform a priori. Also, the azimuthal angle distribution of the IMB events has been affected by the lack of tracks due to the failure at the high-voltage supply to a part of the PMTs (Photo Multiplier Tubes) at the time of the supernova explosion. Taking into account the effect of the lack of tracks, and using a test for the mean direction of the spherical data, we found a significance probability of 12.2% for an isotropic cos 0 distribution. In addition to this, the expected distribution from scattering off electrons for anti-neutrino + proton absorption may be not perfectly isotropic, although the deviation is small. For the expected distribution with the approximate form 1 + 0.13・cos θ which peaks slightly forward at the typical energies of the IMB events (〜30 MeV), we obtained a significance probability of 25.5% by the similar test for the mean direction on the sphere using R. (z component of the resultant length for the data of events), whereas the IMB group has given only few % significance using the Smirnov-Cramer-von Mises test. The significance shows that the IMB data can be accepted with such the non-uniform distribution. The energy dependence of the expected distribution shows the IMB events to peak slightly forward and the Kamiokande events with a mean energy of 〜20 MeV to be distributed uniformly. We can therefore conclude that both angular distributions observed by the IMB and Kamiokande groups do not contradict the assumption that all events are due to ν^^-_e+p→n+e^+ in accordance with the standard model of a supernova explosion. |
| フォーマット |
|
|
内容記述タイプ |
Other |
|
内容記述 |
application/pdf |
AN10074306-19930130-0069.pdf (474.5 kB)
