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Search for Boosted Dark Matter Interacting with Electrons in Super-Kamiokande
Kachulis, C.,Abe, K.,Bronner, C.,Hayato, Y.,Ikeda, M.,Iyogi, K.,Kameda, J.,Kato, Y.,Kishimoto, Y.,Marti, Ll.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakano, Y.,Nakayama, S.,Okajima, Y.,Orii, A.,Pronost, G American Physical Society 2018 Physical Review Letters Vol.120 No.22
<P>A search for boosted dark matter using 161.9 kt yr of Super-Kamiokande IV data is presented. We search for an excess of elastically scattered electrons above the atmospheric neutrino background, with a visible energy between 100 MeV and 1 TeV, pointing back to the Galactic center or the Sun. No such excess is observed. Limits on boosted dark matter event rates in multiple angular cones around the Galactic center and Sun are calculated. Limits are also calculated for a baseline model of boosted dark matter produced from cold dark matter annihilation or decay. This is the first experimental search for boosted dark matter from the Galactic center or the Sun interacting in a terrestrial detector.</P>
Analytical model for transfer length prediction of 13 mm prestressing strand
Marti-Vargas, J.R.,Arbelaez, C.A.,Serna-Ros, P.,Navarro-Gregori, J.,Pallares-Rubio, L. Techno-Press 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.26 No.2
An experimental investigation to determine the transfer length of a seven-wire prestressing strand in different concretes is presented in this paper. A testing technique based on the analysis of bond behaviour by means of measuring the force supported by the prestressing strand on a series of specimens with different embedment lengths has been used. An analytical bond model to calculate the transfer length from an inelastic bond stress distribution along the transfer length has been obtained. A relationship between the plastic bond stress for transfer length and the concrete compressive strength at the time of prestress transfer has been found. An equation to predict the average and both the lower bound and the upper bound values of transfer length is proposed. The experimental results have not only been compared with the theoretical prediction from proposed equations in the literature, but also with experimental results obtained by several researchers.
Abe, K.,Bronner, C.,Pronost, G.,Hayato, Y.,Ikeda, M.,Iyogi, K.,Kameda, J.,Kato, Y.,Kishimoto, Y.,Marti, Ll.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakano, Y.,Nakayama, S.,Okajima, Y.,Orii, A.,Sekiya, H. American Astronomical Society 2017 The Astrophysical journal Vol.850 No.2
<P>We present the results of a search in the Super-Kamiokande (SK) detector for excesses of neutrinos with energies above a few GeV that are in the direction of the track events reported in IceCube. Data from all SK phases (SK-I through SK-IV) were used, spanning a period from 1996 April to 2016 April and corresponding to an exposure of 225 kiloton-years. We considered the 14 IceCube track events from a data set with 1347 livetime days taken from 2010 to 2014. We use Poisson counting to determine if there is an excess of neutrinos detected in SK in a 10 degrees search cone (5 degrees for the highest energy data set) around the reconstructed direction of the IceCube event. No significant excess was found in any of the search directions we examined. We also looked for coincidences with a recently reported IceCube multiplet event. No events were detected within a +/- 500 s time window around the first detected event, and no significant excess was seen from that direction over the lifetime of SK.</P>
Abe, K.,Bronner, C.,Pronost, G.,Hayato, Y.,Ikeda, M.,Iyogi, K.,Kameda, J.,Kato, Y.,Kishimoto, Y.,Marti, Ll.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakano, Y.,Nakayama, S.,Okajima, Y.,Orii, A.,Sekiya, H. American Physical Society 2017 Physical Review D Vol.96 No.1
<P>We have searched for proton decays into a charged antilepton (e(+), mu(+)) plus a meson (eta, rho(0), omega) and for neutron decays into a charged antilepton (e(+), mu(+)) plus a meson (pi(-), rho(-)) using Super-Kamiokande I-IV data, corresponding to 0.316 megaton . years of exposure. This measurement updates the previous published result by using 2.26 times more data and improved analysis methods. No significant evidence for nucleon decay is observed and lower limits on the partial lifetime of the nucleon are obtained. The limits range from 3 x 10(31) to 1 x 10(34) years at 90% confidence level, depending on the decay mode.</P>