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collisions at 
= 200 and 62.4 GeVAdare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Armendariz, R.*; et al.
Physical Review C, 83(6), p.064903_1 - 064903_29, 2011/06
Times Cited Count：184 Percentile：99.44(Physics, Nuclear)Transverse momentum distributions and yields for 
, and 
in collisions at = 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the RHIC. We present the inverse slope parameter, mean transverse momentum, and yield per unit rapidity at each energy, and compare them to other measurements at different collisions. We also present the scaling properties such as 
and 
scaling and discuss the mechanism of the particle production in collisions. The measured spectra are compared to next-to-leading order perturbative QCD calculations.
and Au+Au collisions at 
= 200 GeVAdare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Aramaki, Y.*; et al.
Physical Review C, 83(4), p.044912_1 - 044912_16, 2011/04
Times Cited Count：8 Percentile：49.7(Physics, Nuclear)Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled collisions. Here we extend these studies to two particle correlations where one particle is an electron from the decay of a heavy flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interaction between heavy quarks and the quark-gluon matter. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to collisions.
Ueda, Mai*; Nakabayashi, Ryo*; Kijima, Tatsuya*; Sato, Tsutomu*; Yoneda, Tetsuro*; Otake, Tsubasa*; Oda, Chie
no journal, ,
In the current study, the promoted illitization of montmorillonite in KOH solutions was investigated. Montmorillonite was added to 0, 0.1, 0.5, 1.0, and 3.0 M KOH solutions, which were then sealed and kept at 35 or 60 
C for up to 270 days. Reaction products were analyzed by XRD to check the expandability, an empirical determination of layer charge and observation by AFM. 10 and 35% of illite layer in randomly interstratified illite/smectite minerals were estimated by XRD for 0.1 M and 3.0 M solutions, respectively. Changes in the peak intensities obtained from the XRD patterns could be assigned to the dissolution of montmorillonite, but with some uncertainty affected the reliability of the quantification of illite. No significant illitization was observed based on the results of layer charge and AFM observation. Consequently, there is no direct evidence for significant illitization of montmorillonite in KOH solutions under the experimental conditions of the current study.
solution; The Effect of pH and C-S-H precipitationKijima, Tatsuya*; Nakabayashi, Ryo*; Elakneswaran, Y.*; Oda, Chie; Otake, Tsubasa*; Sato, Tsutomu*; Yoneda, Tetsuro*
no journal, ,
pH dependency of Montmorillonite dissolution rate in Ca-Cl-OH aqueous solution system was confirmed by conducting a flow-through type dissolution experiment. C-S-H formed depending on the experimental pH and concentration of Ca. The dissolution rate determined in the condition where C-S-H formed differed from the rates obtained in NaOH solutions.
C and 60CUeda, Mai*; Nakabayashi, Ryo*; Kijima, Tatsuya*; Sato, Tsutomu*; Yoneda, Tetsuro*; Otake, Tsubasa*; Oda, Chie
no journal, ,
Montmorillonite-rich bentonite is expected to be used as a buffer material in the geological disposal of radioactive wastes. Cement used for the construction of the disposal facility will generate highly alkaline leachates dominated by KOH and NaOH, which may act to cause the alteration of montmorillonite and the loss of the properties of bentonite suitable for the buffer material. In the current study, the illitization of montmorillonite in KOH solutions, which is considered as one of possible alteration processes, was investigated by conducting batch-type reaction experiments at 35 and 60C for up to 270 days. Based on XRD analyses and AFM observations for the reaction products, the formation of illite/smectite interstratified minerals, the increase in the layer charge, and the increase in hight and the decrease in basal area of the dispersed flat particles were recognised. These results indicate that illitization proceeded simultaneously with dissolution of montmorillonite.
Sasagawa, Tsuyoshi; Kijima, Tatsuya*; Sawaguchi, Takuma; Iida, Yoshihisa
no journal, ,
no abstracts in English
Kijima, Tatsuya*; Sasagawa, Tsuyoshi; Sawaguchi, Takuma; Iida, Yoshihisa
no journal, ,
no abstracts in English
