We report a measurement of the \(\nu_\mu\) inclusive charged current cross sections on iron and hydrocarbon in the T2K on-axis neutrino beam. The measured inclusive charged current cross sections on ...iron and hydrocarbon averaged over the T2K on-axis flux with a mean neutrino energy of 1.51 GeV are \((1.444\pm0.002(stat.)_{-0.157}^{+0.189}(syst.))\times 10^{-38}\mathrm{cm}^2/\mathrm{nucleon}\), and \((1.379\pm0.009(stat.)_{-0.147}^{+0.178}(syst.))\times 10^{-38}\mathrm{cm}^2/\mathrm{nucleon}\), respectively, and their cross section ratio is \(1.047\pm0.007(stat.)\pm0.035(syst.)\). These results agree well with the predictions of the neutrino interaction model, and thus we checked the correct treatment of the nuclear effect for iron and hydrocarbon targets in the model within the measurement precisions.
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 is primarily nonquasielastic neutral-current interactions and has only 1.2 events from natural radioactivity. The flux-averaged NCQE cross section we measure is \(1.55 \times 10^{-38}\) cm\(^2\) with a 68\% confidence interval of \((1.22, 2.20) \times 10^{-38}\) cm\(^2\) at a median neutrino energy of 630 MeV, compared with the theoretical prediction of \(2.01 \times 10^{-38}\) cm\(^2\).
We present the results of searches for nucleon decay via bound neutron to antineutrino plus pizero and proton to antineutrino plus piplus using data from a combined 172.8 kiloton-years exposure of ...Super-Kamiokande-I, -II, and -III. We set lower limits on the partial lifetime for each of these modes. For antineutrino pizero, the partial lifetime is >1.1x10^{33} years; for antineutrino piplus, the partial lifetime is >3.9x10^{32} years at 90% confidence level.
A new structural face-up LSI package has been developed. The package shows low thermal resistance without a heatsink and low inductance, capacitance, and resistance values. The package is thin enough ...for portable multimedia equipment applications, with a thickness of 0.5 mn (not including ball height). The measured thermal resistance was 11/spl deg/C/W under natural convection without a heatsink. The simulated inductance and capacitance were 6.7 nH and 1.1 pF respectively, and measured resistance was 520 m/spl Omega/ (line length=14.7 mm, width=60 /spl mu/m). The package consists of a resin film and a ceramic substrate. The film is a liquid crystal polymer (LCP) and the substrate is aluminum nitride (AlN). LCP is a suitable material for buried-bump interconnection technology (B2it/sup TM/). AlN has high thermal conductivity and its coefficient of thermal expansion (CTE) is close to that of silicon. Both materials were laminated by an adhesive agent. This material combination provides a thin structure, low thermal resistance, and low LCR which are suitable for portable multimedia electrical equipment. This paper reports the configuration and performance characteristics of this newly developed package.
The T2K experiment observes indications of ν(μ) → ν(e) appearance in data accumulated with 1.43×10(20) protons on target. Six events pass all selection criteria at the far detector. In a three-flavor ...neutrino oscillation scenario with |Δm(23)(2)| = 2.4×10(-3) eV(2), sin(2)2θ(23) = 1 and sin(2)2θ(13) = 0, the expected number of such events is 1.5±0.3(syst). Under this hypothesis, the probability to observe six or more candidate events is 7×10(-3), equivalent to 2.5σ significance. At 90% C.L., the data are consistent with 0.03(0.04) < sin(2)2θ(13) < 0.28(0.34) for δ(CP) = 0 and a normal (inverted) hierarchy.
Dissertation
Fine Pitch High Pin Count AIN LGga Package Asai, H.; Kudo, J.; Yano, K. ...
IEMT/IMC Symposium, 1st Joint International Electronic Manufacturing Symposium and the International Microelectronics Conference,
1997
Conference Proceeding
The spent nuclear fuel reprocessing plant of Japan Nuclear Fuel Limited (JNFL) located in Rokkasho, Japan, discharged small amounts of (85)Kr into the atmosphere during final tests of the plant with ...actual spent fuel from 31 March 2006 to October 2008. During this period, the gamma-ray dose rates due to discharged (85)Kr were higher than the background rates measured at the Institute for Environmental Sciences and at seven monitoring stations of the Aomori prefectural government and JNFL. The dispersion of (85)Kr was simulated by means of the fifth-generation Penn State/NCAR Mesoscale Model and the CG-MATHEW/ADPIC models (ver. 5.0) with a vertical terrain-following height coordinate. Although the simulated gamma-ray dose rates due to discharged (85)Kr agreed fairly well with measured rates, the agreement between the estimated monthly mean (85)Kr concentrations and the observed concentrations was poor. Improvement of the vertical flow of air may lead to better estimation of (85)Kr dispersion.
The spent nuclear fuel reprocessing plant of Japan Nuclear Fuel Limited (JNFL) located in Rokkasho, Japan, discharged small amounts of super(85)Kr into the atmosphere during final tests of the plant ...with actual spent fuel from 31 March 2006 to October 2008. During this period, the gamma-ray dose rates due to discharged super(85)Kr were higher than the background rates measured at the Institute for Environmental Sciences and at seven monitoring stations of the Aomori prefectural government and JNFL. The dispersion of super(85)Kr was simulated by means of the fifth-generation Penn State/NCAR Mesoscale Model and the CG-MATHEW/ADPIC models (ver. 5.0) with a vertical terrain-following height coordinate. Although the simulated gamma-ray dose rates due to discharged super(85)Kr agreed fairly well with measured rates, the agreement between the estimated monthly mean super(85)Kr concentrations and the observed concentrations was poor. Improvement of the vertical flow of air may lead to better estimation of super(85)Kr dispersion.
The
222Rn concentrations in indoor workplaces were measured in Aomori Prefecture, Japan, and the results are reported here. This survey was part of a program to measure background natural radiation ...dose rate in the prefecture where the first Japanese nuclear fuel cycling facilities are now under construction.
The survey of the
222Rn concentrations in indoor workplaces was carried out at 107 locations from 1996 to 1998. The
222Rn concentrations were measured for approximately one year at each site with passive Rn detectors, which used a polycarbonate film for counting α-rays and could separate concentrations of
222Rn from
220Rn. Weeklong measurements of
222Rn concentration and working level were carried out with active detectors to get the ratio of
222Rn concentration during working hours to non-working hours as well as equilibrium factors in selected locations.
Diurnal variation of
222Rn concentration depended on building structure, air-conditioning, time of day and day of the week (week days or weekend). The
222Rn concentration during working hours was generally lower than that in non-working hours. Although the annual average
222Rn concentration in indoor occupational environments was higher than that in dwellings, radiation dose for Aomori Prefecture residents from Rn in the former was 14% of the total indoor dose by Rn because of the lower concentration in working hours and lower occupancy factor.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
