Yousuke Takubo

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We present results for nu(mu) oscillation in the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment. K2K uses an accelerator-produced nu(mu) beam with a mean energy of 1.3 GeV directed at the Super-Kamiokande detector. We observed the energy-dependent disappearance of nu(mu), which we presume have oscillated to nu(tau). The probability that(More)
We report the result from a search for charged-current coherent pion production induced by muon neutrinos with a mean energy of 1.3 GeV. The data are collected with a fully active scintillator detector in the K2K long-baseline neutrino oscillation experiment. No evidence for coherent pion production is observed, and an upper limit of is set on the cross(More)
Planar geometry silicon pixel and strip sensors for the high luminosity upgrade of the LHC (HL-LHC) require a high bias voltage of 1000 V in order to withstand a radiation damage caused by particle fluences of 1 10 1 MeV neq/cm and 1 10 1 MeV neq/cm for pixel and strip detectors, respectively. In order to minimize the inactive edge space that can withstand(More)
Radiation-tolerant n-in-p silicon sensors were developed for use in very high radiation environments. Novel n-in-p silicon strip and pixel sensors and test structures were fabricated, tested and evaluated, in order to understand the designs implemented. The resistance between the n implants (interstrip resistance), the electric potential of the p-stop, and(More)
In experiments at high intensity accelerators such as the LHC and its planned upgrade HL-LHC, the silicon microstrip detector should be designed to survive against possible beam loss that may create large amount of signal charges in short period. We are designing a built-in protection structure based on a punch through mechanism for the p-bulk n-readout(More)
For the vertex detector in ILC experiments, pixel occupancy is one of the most challenging issues. Due to a large amount of electron-positron pairs created by the beam-beam interaction, the pixel occupancy exceeds 10% if the signal is accumulated for one bunch train for pixel detectors with standard (∼ 20 μm) pixel size used for the innermost layer. In(More)
Highly radiation tolerant n-in-p strip sensors have been developed for the high-luminosity LHC (HLLHC). This paper reports the results of measurements with 392 MeV kinetic energy proton beam at RCNP in December 2011. The data was taken with a new DAQ system consisting of an universal read-out board ‘SEABAS’ and beam tracking telescopes whose spacial(More)
We performed an improved search for nu(mu) --> nu(e) oscillation with the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment, using the full data sample of 9.2 x 10(19) protons on target. No evidence for a nu(e) appearance signal was found, and we set bounds on the nu(mu) --> nu(e) oscillation parameters. At Deltam(2)=2.8 x 10(-3) eV(2), the(More)
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