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Journal Articles

Event structure and double helicity asymmetry in jet production from polarized $$p + p$$ collisions at $$sqrt{s}$$ = 200 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Y.*; Al-Bataineh, H.*; Alexander, J.*; Aoki, K.*; Aphecetche, L.*; Armendariz, R.*; et al.

Physical Review D, 84(1), p.012006_1 - 012006_18, 2011/07

 Times Cited Count:25 Percentile:72.31(Astronomy & Astrophysics)

We report on the event structure and double helicity asymmetry ($$A_{LL}$$) of jet production in longitudinally polarized $$p + p$$ collisions at $$sqrt{s}$$ = 200 GeV. Photons and charged particles were measured by the PHENIX experiment. Event structure was compared with the results from PYTHIA event generator. The production rate of reconstructed jets is satisfactorily reproduced with the next-to-leading-order perturbative QCD calculation. We measured $$A_{LL}$$ = -0.0014 $$pm$$ 0.0037 at the lowest $$P_T$$ bin and -0.0181 $$pm$$ 0.0282 at the highest $$P_T$$ bin. The measured $$A_{LL}$$ is compared with the predictions that assume various $$Delta G(x)$$ distributions.

Journal Articles

Identified charged hadron production in $$p + p$$ collisions at $$sqrt{s}$$ = 200 and 62.4 GeV

Adare, 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:156 Percentile:99.42(Physics, Nuclear)

Transverse momentum distributions and yields for $$pi^{pm}, K^{pm}, p$$, and $$bar{p}$$ in $$p + p$$ collisions at $$sqrt{s}$$ = 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 $$sqrt{s}$$ collisions. We also present the scaling properties such as $$m_T$$ and $$x_T$$ scaling and discuss the mechanism of the particle production in $$p + p$$ collisions. The measured spectra are compared to next-to-leading order perturbative QCD calculations.

Journal Articles

Progress of ultra-high-speed image sensors with in-situ CCD storage

Eto, Takeharu*; Dao, V. T. S.*; Nguyen, H. D.*; Fife, K.*; Kureta, Masatoshi; Segawa, Mariko; Arai, Masatoshi; Shinohara, Takenao

Proceedings of 2011 International Image Sensor Workshop (IISW), 4 Pages, 2011/06

This paper reviews progress of technologies on ultra-high-speed image sensors with in-situ CCD signal storage. The CCD storage for each pixel has more than one hundred CCD memory elements. Simultaneous parallel recording of signals at all pixels enables ultra-high-speed capturing of consecutive images.

Journal Articles

Azimuthal correlations of electrons from heavy-flavor decay with hadrons in $$p+p$$ and Au+Au collisions at $$sqrt{s_{NN}}$$ = 200 GeV

Adare, 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:52.71(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 $$p+p$$ 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 $$p+p$$ collisions.

Journal Articles

Measurement of neutral mesons in $$p$$ + $$p$$ collisions at $$sqrt{s}$$ = 200 GeV and scaling properties of hadron production

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Y.*; Al-Bataineh, H.*; Alexander, J.*; Aoki, K.*; Aphecetche, L.*; Armendariz, R.*; et al.

Physical Review D, 83(5), p.052004_1 - 052004_26, 2011/03

 Times Cited Count:149 Percentile:98.49(Astronomy & Astrophysics)

The PHENIX experiment at RHIC has measured the invariant differential cross section for production of $$K^0_s$$, $$omega$$, $$eta'$$ and $$phi$$ mesons in $$p + p$$ collisions at $$sqrt{s}$$ = 200 GeV. The spectral shapes of all hadron transverse momentum distributions are well described by a Tsallis distribution functional form with only two parameters, $$n$$ and $$T$$, determining the high $$p_T$$ and characterizing the low $$p_T$$ regions for the spectra, respectively. The integrated invariant cross sections calculated from the fitted distributions are found to be consistent with existing measurements and with statistical model predictions.

Journal Articles

Model calibration of small and large-scale laboratory THM experiments of the MX-80 bentonite

Chijimatsu, Masakazu*; B$"o$rgesson, L.*; Fujita, Tomo; Hernelind, J.*; Jussila, P.*; Nguyen, T. S.*; Rutqvist, J.*; Jing, L.*

Proceedings of 2nd International Conference on Coupled T-H-M-C Processes in Geo-systems; Fundamentals, Modeling, Experiments and Applications (GeoProc 2006), p.254 - 260, 2006/05

In Task A of DECOVALEX-THMC, five research teams study the influence of THM coupling on the safety of the near-field of a typical geological repository for high-level radioactive waste. In order to refine the analyses, the teams calibrated their models with laboratory experiments, including: swelling pressure tests, water uptake tests, thermally gradient tests, and the CEA mock-up THM experiment. This paper describes the mathematical models used by the teams, and compares the results of their calibration with the experimental data.

Journal Articles

Influence of coupled THM phenomena on the safety of a spent fuel repository; A Near-field study

Nguyen, T. S.*; B$"o$rgesson, L.*; Chijimatsu, Masakazu*; Fujita, Tomo; Hernelind, J.*; Jussila, P.*; Rutqvist, J.*; Jing, L.*

Proceedings of 2nd International Conference on Coupled T-H-M-C Processes in Geo-systems; Fundamentals, Modeling, Experiments and Applications (GeoProc 2006), p.141 - 149, 2006/05

In order to demonstrate the feasibility of geological disposal of spent CANDU fuel in Canada, a safety assessment was performed for a hypothetical repository in the Canadian Shield. The assessment shows that such repository would meet international criteria for dose rate; however, uncertainties in the assumed evolution of the repository were identified. Such uncertainties could be resolved by the consideration of coupled Thermal-Hydro-Mechanical-Chemical (THMC) processes. In Task A of the DECOVALEX-THMC project, THM models will be refined and used to perform near-field simulations of the evolution of the repository in order to address the above uncertainties. This paper presents the definition and rationale of Task A and the preliminary results.

Journal Articles

Implications of Coupled Thermo-Hydro-Mechanical Processes on the Safety of a Hypothetical Nuclear Fuel Waste Repository

Nguyen, T. S.; Chijimatsu, M.*; De Jonge, J.*; Jing, L.*; Kohlmeier, M.*; Millard, A.*; Sugita, Yutaka

P.212-217, p.212 - 217, 2003/00

None

Journal Articles

Evaluation of the Impact of Thermo-Hydro-Mechanical Coupling in Bentonite and Near-Field Rock Barriers of a Nuclear Waste Repository in a Sparsely Fractured Hard Rocks

Rutqvist, J.; Jing, L.*; Chijimatsu, M.*; Millard, A.*; Nguyen, T. S.*; Rejeb, A.*; Sugita, Yutaka

Proceedings of International Conference on Coupled T-H-M-C Processes in Geo-systems; Fundamentals, Modelling, Experiments and Applications (GeoProc 2003), p.205 - 211, 2003/00

None

Journal Articles

Coupled thermo-hydro-mechanical analysis of a heater test in fractured rock and bentonite at Kamaishi mine-comparison of field results to predictions of four finite element codes

Sugita, Yutaka; Rutqvist, J.*; B$"o$rgesson, L.*; Chijimatsu, Masakazu*; Nguyen, T. S.*; Jing, L.*; Noorisha, J.*; Tsang, C.-F.*

International Journal of Rock Mechanics and Mining Sciences, 38(1), p.129 - 142, 2001/00

no abstracts in English

Journal Articles

Hydro-mechanical response of a fractured granitic rock mass to excavation of a test pit-the Kamaishi mine experiment in Japan

Sugita, Yutaka; Nguyen, T. S.*; B$"o$rgesson, L.*; Chijimatsu, Masakazu*; Rutqvist, J.*; Fujita, Tomo; Hernelind, J.*; Kobayashi, Akira*; Onishi, Yuzo*; Tanaka, Makoto*; et al.

International Journal of Rock Mechanics and Mining Sciences, 38(1), p.79 - 94, 2001/00

None

Journal Articles

Thermohydromechanics of partially saturated geological media; Governing equations and formulation of four finite element codes

Sugita, Yutaka; Rutqvist, J.*; Noorisha, J.*; Tsang, C.-F.*; B$"o$rgesson, L.*; Nguyen, T. S.*

International Journal of Rock Mechanics and Mining Sciences, 38(1), p.105 - 127, 2001/00

None

Journal Articles

Thermo-hydro-mechanical characterization of a bentonite-based buffer material by laboratory tests and numerical back analyses

B$"o$rgesson, L.*; Chijimatsu, Masakazu*; Fujita, Tomo; Nguyen, T. S.*; Rutqvist, J.*; Jing, L.*

International Journal of Rock Mechanics and Mining Sciences, 38(1), p.95 - 104, 2001/00

 Times Cited Count:55 Percentile:90.81(Engineering, Geological)

None

13 (Records 1-13 displayed on this page)
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