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T. Muranaka,T. Uehara,T. Sakano,Y. Nabetani,T. Akitsu,T. Kato,T. Matsumoto,S. Hagihara,O. Abe,S. Hiraki,Y. Fujikawa 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Ga-doped zinc-oxide (GZO) films grown at various Ga/Zn supply ratios were prepared on glass substrates by using plasma-assisted molecular beam deposition. The films were carefully characterized by using Hall, X-ray diffraction (XRD) and transmission electron microscopy (TEM) measurements. At low Ga/Zn supply ratios, the carrier density systematically increased with increasing Ga/Zn supply ratio. However, a saturation of the carrier density near 4 − 6 × 1020 cm−3 was observed when the Ga/Zn supply ratio was in the range from 5 × 10−5 % to 0.5 %. From TEM observations, uniform crystal grains were observed to grow with low-angle tilt grain boundaries in GZO films with low doping. On the other hand, high-angle tilt grain boundaries were observed in the highly-doped GZO films. A detailed selected area electron diffraction (SAED) analysis revealed that such non-uniformity in the highly-doped GZO films appears during the initial growth stage.
T. Muranaka,A. Nisii,T. Uehara,T. Sakano,Y. Nabetani,T. Akitsu,T. Kato and T. Matsumoto,T. Matsumoto,S. Hagihara,O. Abe,S. Hiraki,Y. Fujikawa 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Ga-doped zinc-oxide (GZO) films grown under various Ga/Zn supply ratios were carefully characterized by using Hall measurements and optical transmittance measurements to investigate the electrical and the optical properties of the GZO films on glass, polyethylene terephthalate (PET), and polycarbonate (PC) substrates. The resistivity of the GZO films grown at 290 ℃ on glass substrates ranged from 4 × 10-2 cm to 3 × 10-4 cm for Ga/Zn supply ratios from 0 % to 0.5 %. The growth of the GZO films at a low temperature of 90 ℃ was also performed on glass, PET, and PC substrates. When the Ga/Zn supply ratios were 0.05 - 0.1 %, the 90 ℃-grown GZO films on glass substrates showed resistivities similar to those of 290 ℃-grown GZO films. The 90 ℃-grown GZO films on PET and PC substrates showed resistivities of 1 × 10-3 cm and 4 × 10-4 cm, respectively. The Hall carrier density was 8 × 1020 cm-3, which was almost the same value as that of the 90 ℃-grown GZO films on glass substrates. The GZO films on PET and PC substrates also showed visible transparency as good as that of the GZO films on glass substrates, and the average transmittance in the visible region was higher than 85 %.
High-statistics study ofηπ0production in two-photon collisions
Uehara, S.,Watanabe, Y.,Nakazawa, H.,Adachi, I.,Aihara, H.,Arinstein, K.,Aulchenko, V.,Bakich, A. M.,Belous, K.,Bondar, A.,Brač,ko, M.,Browder, T. E.,Chang, P.,Chen, A.,Cheon, B. G.,Chistov, R.,C American Physical Society 2009 PHYSICAL REVIEW D - Vol.80 No.3
Study ofπ0pair production in single-tag two-photon collisions
Masuda, M.,Uehara, S.,Watanabe, Y.,Nakazawa, H.,Abdesselam, A.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Atmacan, H.,Aulchenko, V.,Aushev, T.,Babu, V.,Badhrees, I.,Bakich, A. M.,Barberio, E.,Behe American Physical Society 2016 Physical Review D Vol.93 No.3
<P>We report a measurement of the differential cross section of pi(0) pair production in single-tag two-photon collisions, gamma*gamma -> pi(0) pi(0), in e(+) e(-) scattering. The cross section is measured for Q(2) up to 30 GeV2, where Q(2) is the negative of the invariant mass squared of the tagged photon, in the kinematic range 0.5 GeV < W < 2.1 GeV and vertical bar cos theta*vertical bar < 1.0 for the total energy and pion scattering angle, respectively, in the gamma*gamma center-of-mass system. The results are based on a data sample of 759 fb(-1) collected with the Belle detector at the KEKB asymmetric-energy e(+) e(-) collider. The transition form factor of the f(0)(980) and that of the f(2)(1270) with the helicity-0, -1, and -2 components separately are measured for the first time and are compared with theoretical calculations.</P>
Nakazawa, H.,Uehara, S.,Abe, K.,Abe, K.,Aihara, H.,Akatsu, M.,Asano, Y.,Aulchenko, V.,Aushev, T.,Bahinipati, S.,Bakich, A.M.,Ban, Y.,Banerjee, S.,Bedny, I.,Bitenc, U.,Bizjak, I.,Blyth, S.,Bondar, A.,B Elsevier 2005 Physics letters: B Vol.615 No.1
<P><B>Abstract</B></P><P>We have measured <SUP>π+</SUP><SUP>π−</SUP> and <SUP>K+</SUP><SUP>K−</SUP> production in two-photon collisions using 87.7<SUP>fb−1</SUP> of data collected with the Belle detector at the asymmetric energy <SUP>e+</SUP><SUP>e−</SUP> collider KEKB. The cross sections are measured to high precision in the two-photon center-of-mass energy (<I>W</I>) range between 2.4GeV<W<4.1GeV and angular region |cos<SUP>θ∗</SUP>|<0.6. The cross section ratio σ(γγ→<SUP>K+</SUP><SUP>K−</SUP>)/σ(γγ→<SUP>π+</SUP><SUP>π−</SUP>) is measured to be 0.89±0.04(stat.)±0.15(syst.) in the range of 3.0GeV<W<4.1GeV, where the ratio is energy-independent. We observe a <SUP>sin−4</SUP><SUP>θ∗</SUP> behavior of the cross section in the same <I>W</I> range. Production of <SUB>χc0</SUB> and <SUB>χc2</SUB> mesons is observed in both γγ→<SUP>π+</SUP><SUP>π−</SUP> and γγ→<SUP>K+</SUP><SUP>K−</SUP> modes.</P>
Study of KS0 pair production in single-tag two-photon collisions
Masuda, M.,Uehara, S.,Watanabe, Y.,Adachi, I.,Ahn, J. K.,Aihara, H.,Al Said, S.,Asner, D. M.,Atmacan, H.,Aulchenko, V.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bansal, V.,Behera, P.,Berger, M.,Bhardw American Physical Society 2018 Physical Review D Vol.97 No.5