Search results for "kami"
showing 10 items of 149 documents
Zenith angle distributions at Super-Kamiokande and SNO and the solution of the solar neutrino problem
2000
We have performed a detailed study of the zenith angle dependence of the regeneration factor and distributions of events at SNO and SK for different solutions of the solar neutrino problem. In particular, we discuss oscillatory behaviour and the synchronization effect in the distribution for the LMA solution, the parametric peak for the LOW solution, etc.. Physical interpretation of the effects is given. We suggest a new binning of events which emphasizes distinctive features of zenith angle distributions for the different solutions. We also find the correlations between the integrated day-night asymmetry and the rates of events in different zenith angle bins. Study of these correlations st…
Measurement of the neutrino-oxygen neutral-current interaction cross section by observing nuclear deexcitation gamma rays
2014
We report the first measurement of the neutrino-oxygen neutral-current quasielastic (NCQE) cross section. It is obtained by observing nuclear deexcitation $\gamma$-rays which follow neutrino-oxygen interactions at the Super-Kamiokande water Cherenkov detector. We use T2K data corresponding to $3.01 \times 10^{20}$ protons on target. By selecting only events during the T2K beam window and with well-reconstructed vertices in the fiducial volume, the large background rate from natural radioactivity is dramatically reduced. We observe 43 events in the $4-30$ MeV reconstructed energy window, compared with an expectation of 51.0, which includes an estimated 16.2 background events. The background …
The T2K Experiment
2011
The T2K experiment is a long-baseline neutrino oscillation experiment. Its main goal is to measure the last unknown lepton sector mixing angle {\theta}_{13} by observing {\nu}_e appearance in a {\nu}_{\mu} beam. It also aims to make a precision measurement of the known oscillation parameters, {\Delta}m^{2}_{23} and sin^{2} 2{\theta}_{23}, via {\nu}_{\mu} disappearance studies. Other goals of the experiment include various neutrino cross section measurements and sterile neutrino searches. The experiment uses an intense proton beam generated by the J-PARC accelerator in Tokai, Japan, and is composed of a neutrino beamline, a near detector complex (ND280), and a far detector (Super-Kamiokande)…
Orveliskie motīvi Haruki Murakami darbā „1Q84”
2017
Šī darba izstrādes gaitā autors ir veicis pētījumu par angļu literatūras klasiķa Džordža Orvela romāna „1984” ietekmi uz populārā mūsdienu japāņu autora Haruki Murakami sarakstīto romānu „1Q84”. Darbā tiek izmantotas salīdzināšanas un analīzes metodes, ar kuru palīdzību tiek tuvāk pētīti galvenie motīvi, kas parādās abos literārajos darbos. Mūsdienās sabiedrība pievērš arvien lielāku uzmanību tādām tēmām kā propaganda un dažādas valsts vadīšanas sistēmas, tāpēc šie abu autoru romāni ir kļuvuši ļoti aktuāli un tajos ir negaidītas analoģijas ar mūsdienu pasaulē notiekošo. Darbā tiek tuvāk izklāstīta arī abu autoru biogrāfija un literārā darbība. Pēc tam tiek veikta tekstu analīze un salīdzinā…
First measurement of the muon neutrino charged current single pion production cross section on water with the T2K near detector
2017
The T2K off-axis near detector, ND280, is used to make the first differential cross section measurements of muon neutrino charged current single positive pion production on a water target at energies ∼0.8 GeV. The differential measurements are presented as a function of the muon and pion kinematics, in the restricted phase space defined by pπ+>200 MeV/c, pμ>200 MeV/c, cos(θπ+)>0.3 and cos(θμ)>0.3. The total flux integrated νμ charged current single positive pion production cross section on water in the restricted phase space is measured to be ⟨σ⟩ϕ=4.25±0.48(stat)±1.56(syst)×10-40 cm2/nucleon. The total cross section is consistent with the NEUT prediction (5.03×10-40 cm2/nucleon) and 2σ…
Kamikadzes fenomens Japānas un Austrumāzijas kultūras kontekstā
2021
Bakalaura darbā “Kamikadzes fenomens Japānas un Austrumāzijas kultūras kontekstā” tiek pētīti kamikadzes pašupurēšanās reliģiskie, politiskie, lojalitātes iemesli. Kā arī kamikadzes jauniešu domas un idejas par pašnāvību cēlāku mērķu labā. Darba aktualitāte ir saistīta ar termina pašnāvība uzskatiem un izskaidrošanu Japānā un šī procesa norises salīdzināšana ar Ķīnu un Koreju. Mūsdienās pašnāvības cēlonis bieži ir viens, bet līdz pat otrā pasaules kara laikam pašnāvībai bija arī citi iemesli un nozīme. Kamikadzes termins mūsdienās ir ar plašāku nozīmi un apzīmē jebkāda veida pašnāvību cēlāku mērķu labā neatkarīgi no valsts. Darba 1. daļā ir apskatīts uzskati un tradīcijas Japānas un Austrum…
Search for Lorentz and CPT violation using sidereal time dependence of neutrino flavor transitions over a short baseline
2017
A class of extensions of the Standard Model allows Lorentz and CPT violations, which can be identified by the observation of sidereal modulations in the neutrino interaction rate. A search for such modulations was performed using the T2K on-axis near detector. Two complementary methods were used in this study, both of which resulted in no evidence of a signal. Limits on associated Lorentz and CPT-violating terms from the Standard Model extension have been derived by taking into account their correlations in this model for the first time. These results imply such symmetry violations are suppressed by a factor of more than 1020 at the GeV scale.
Probing the neutrino mass hierarchy with Super-Kamiokande
2012
We show that for recently discovered large values of theta(13), a superbeam with an average neutrino energy of ~ 5 GeV, such as those being proposed at CERN, if pointing to Super-Kamiokande (L = 8770 km), could reveal the neutrino mass hierarchy at 5 sigma in less than two years irrespective of the true hierarchy and CP phase. The measurement relies on the near resonant matter effect in the numu to nue oscillation channel, and can be done counting the total number of appearance events with just a neutrino beam.
Rejection Power of A Horizontal Rpc Telescope For Left and Right Coming Cosmic Muons
1993
Abstract The possibility of performing neutrino astronomy by means of a detector above the ground depends critically on the feasibility of a rejection power on the order of 10 11 required to discriminate the enormous background of cosmic downward going muons from the signal of upward going muons produced by neutrinos. In order to check whether and how this rejection is obtainable, we have built in the Physics Department of the University of Bari a horizontal cosmic muon telescope (MINI) instrumented with resistive plate counters. By performing time-of-flight measurements, we have estimated the rejection power of our telescope for left and right coming cosmic muons. The rejection dependence …
Neutron-Tagging with Hydrogen in Super-Kamiokande IV: Global Atmospheric Neutrino Oscillation Analysis with SK
2018
Currently, SK has the capability of tag neutrons through hydrogen-neutron captures. This technique is around four times less efficient than in the proposed SuperK, Gd, i.e. \(\sim \)20%. However, it is enough for seen the relevance of the improvements, brought by neutron tagging, in the atmospheric oscillation analysis.