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Classification of three-generation models on magnetized orbifolds
Abe, T.h.,Fujimoto, Y.,Kobayashi, T.,Miura, T.,Nishiwaki, K.,Sakamoto, M.,Tatsuta, Y. North Holland 2015 Nuclear Physics, Section B Vol.894 No.-
We classify the combinations of parameters which lead three generations of quarks and leptons in the framework of magnetized twisted orbifolds on T<SUP>2</SUP>/Z<SUB>2</SUB>, T<SUP>2</SUP>/Z<SUB>3</SUB>, T<SUP>2</SUP>/Z<SUB>4</SUB> and T<SUP>2</SUP>/Z<SUB>6</SUB> with allowing nonzero discretized Wilson line phases and Scherk-Schwarz phases. We also analyze two actual examples with nonzero phases leading to one-pair Higgs and five-pair Higgses and discuss the difference from the results without nonzero phases studied previously. (Note: this article is registered under preprint number: arXiv:1501.02787 [hep-ph].)
Zheng, W.,Shen, R. F.,Sakamoto, T.,Beardmore, A. P.,De Pasquale, M.,Wu, X. F.,Gorosabel, J.,Urata, Y.,Sugita, S.,Zhang, B.,Pozanenko, A.,Nissinen, M.,Sahu, D. K.,Im, M.,Ukwatta, T. N.,Andreev, M.,Klun IOP Publishing 2012 The Astrophysical journal Vol.751 No.2
<P>We present a comprehensive analysis of a bright, long-duration (T-90 similar to 257 s) GRB 110205A at redshift z = 2.22. The optical prompt emission was detected by Swift/UVOT, ROTSE-IIIb, and BOOTES telescopes when the gamma-ray burst (GRB) was still radiating in the gamma-ray band, with optical light curve showing correlation with gamma-ray data. Nearly 200 s of observations were obtained simultaneously from optical, X-ray, to gamma-ray (1 eV to 5 MeV), which makes it one of the exceptional cases to study the broadband spectral energy distribution during the prompt emission phase. In particular, we clearly identify, for the first time, an interesting two-break energy spectrum, roughly consistent with the standard synchrotron emission model in the fast cooling regime. Shortly after prompt emission (similar to 1100 s), a bright (R = 14.0) optical emission hump with very steep rise (alpha similar to 5.5) was observed, which we interpret as the reverse shock (RS) emission. It is the first time that the rising phase of an RS component has been closely observed. The full optical and X-ray afterglow light curves can be interpreted within the standard reverse shock (RS) + forward shock (FS) model. In general, the high-quality prompt and afterglow data allow us to apply the standard fireball model to extract valuable information, including the radiation mechanism (synchrotron), radius of prompt emission (R-GRB similar to 3 x 10(13) cm), initial Lorentz factor of the outflow (Gamma(0) similar to 250), the composition of the ejecta (mildly magnetized), the collimation angle, and the total energy budget.</P>
Recent progress in Large Helical Device experiments
Akio Komori,T. Shimozuma,T. Ido,T. Kobuchi,T. Seki,T. Ozaki,T. Fujita,T. Watari,T. Akiyama,T. Tokuzawa,T. Uda,T. Minami,Y. Nakamura,Y. Torii,Y. Sakamoto,Y. Takeiri,Y. Nagayama,Y. Oka,Y. Narushima,Y. Y 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
In the Large Helical Device (LHD), some reactor-oriented experiments, i.e. high beta, high ion temperature, steady state operation, have produced remarkable progress in recent experimental campaigns. By optimizing the rotational transform, an average beta value of 4.3 %, which is the highest on record for helical devices, was achieved. The ICRF sustained steady-state discharges for more than 30 minutes, these were also successfully performed with the aid of the magnetic axis swing technique for the reduction of the heat load to the plasma-facing component. In the discharge, the total input energy to the plasma reached 1.3 GJ, which also established a new record.1
Synthesis of Zn2SiO4:Mn2+ using SiOx as an oxidation inhibitor
T. Sakamoto 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.S1
A Zn2SiO4:Mn2+ phosphor was synthesized using SiOx as an antioxidizing reagent of Mn2+. The phosphor was efficiently excited by near UV light in a range of 220 - 350 nm, and emitted a green light around 525 nm. The sample showed green emission about 1.2 times higher than that of the one synthesized by a conventional solid state reaction method.
Sakamoto, T.,Troja, E.,Aoki, K.,Guiriec, S.,Im, M.,Leloudas, G.,Malesani, D.,Melandri, A.,de Ugarte Postigo, A.,Urata, Y.,Xu, D.,D'Avanzo, P.,Gorosabel, J.,Jeon, Y.,Sá,nchez-Ramí,rez, R.,A IOP Publishing 2013 The Astrophysical journal Vol.766 No.1
<P>We present our successful Chandra program designed to identify, with subarcsecond accuracy, the X-ray afterglow of the short GRB 111117A, which was discovered by Swift and Fermi. Thanks to our rapid target of opportunity request, Chandra clearly detected the X-ray afterglow, though no optical afterglow was found in deep optical observations. The host galaxy was clearly detected in the optical and near-infrared band, with the best photometric redshift of z = 1.31(-0.23)(+0.46) (90% confidence), making it one of the highest known short gamma-ray burst ( GRB) redshifts. Furthermore, we see an offset of 1.0 +/- 0.2 arcsec, which corresponds to 8.4 +/- 1.7 kpc, between the host and the afterglow position. We discuss the importance of using Chandra for obtaining subarcsecond X-ray localizations of short GRB afterglows to study GRB environments.</P>
ASTROS - A TELESCOPE CONTROL SYSTEM FOR A SMALL RADIO TELESCOPE
HANDA T.,HASEGAWA T.,MORINO J. I.,OKA T.,SATO K.,SORAI K.,SETA M.,HAYASHI M.,SAKAMOTO S. The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
We developed a telescope control system called ASTROS for the VST1 and VST2, which are specially designed radio telescopes to make a survey and have a 60-cm main dish. ASTROS is designed on the distributed intelligence concept and structurized programming. The hardware of the system is composed of several intelligent devices connected with de facto standard interfaces and main control unit is PC. The program is coded in the C language and its structure is object oriented in order to make easy to replace the component devices. ASTROS is now running on two twin telescopes, VST1 and VST2. VST1 is installed at Nobeyama in Japan and VST2 is installed at La Silla in Chile. They are making a galactic plane survey in CO (J=2-1) with 9 arcmin beam semi-automatically.
Kajimoto, T.,Shigyo, N.,Sanami, T.,Iwamoto, Y.,Hagiwara, M.,Lee, H.S.,Soha, A.,Ramberg, E.,Coleman, R.,Jensen, D.,Leveling, A.,Mokhov, N.V.,Boehnlein, D.,Vaziri, K.,Sakamoto, Y.,Ishibashi, K.,Nakashim North-Holland Physics Pub 2014 Nuclear instruments & methods in physics research. Vol.337 No.-
The energy spectra of neutrons were measured by a time-of-flight method for 120GeV protons on thick graphite, aluminum, copper, and tungsten targets with an NE213 scintillator at the Fermilab Test Beam Facility. Neutron energy spectra were obtained between 25 and 3000MeV at emission angles of 30<SUP>o</SUP>, 45<SUP>o</SUP>, 120<SUP>o</SUP>, and 150<SUP>o</SUP>. The spectra were parameterized as neutron emissions from three moving sources and then compared with theoretical spectra calculated by PHITS and FLUKA codes. The yields of the theoretical spectra were substantially underestimated compared with the yields of measured spectra. The integrated neutron yields from 25 to 3000MeV calculated with PHITS code were 16-36% of the experimental yields and those calculated with FLUKA code were 26-57% of the experimental yields for all targets and emission angles.