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Carlson, A. D.*; Pronyaev, V.*; Hale, G. M.*; Zhenpeng, C.*; Capote, R.*; Durn, I.*; Hambsch, F.-J.*; Kawano, Toshihiko*; Kunieda, Satoshi; 13 of others*
EPJ Web of Conferences, 146, p.02025_1 - 02025_4, 2017/09
Times Cited Count:4 Percentile:90.94Evaluations are being done for the H(n,n), Li(n,t), B(n,), B(n,), C(n,n), Au(n,), U(n,f) and U(n,f) standard cross sections. Evaluations are also being done for data that are not traditional standards including: the Au(n,) cross section at energies below where it is considered a standard; reference cross sections for prompt -ray production in fast neutron-induced reactions; reference cross sections for very high energy fission cross sections; the U thermal neutron fission spectrum and the Cf spontaneous fission neutron spectrum and the thermal constants.
Wan, L. K.*; Peng, J.*; Lin, M.; Muroya, Yusa*; Katsumura, Yosuke*; Fu, H. Y.*
Radiation Physics and Chemistry, 81(5), p.524 - 530, 2012/05
Times Cited Count:16 Percentile:75.65(Chemistry, Physical)Rate constants of common crown ethers ((CHO), n=4, 5, 6) and their model compound, 1,4-dioxane(6C2) with some important oxidative radicals, OH, SO, and NO were determined in various aqueous solutions using pulse radiolysis and laser photolysis techniques. The rate constants for 6C2 and crown ethers with OH and SO increase with the number of H-atom in the ethers, indicating that H-abstraction is dominant reaction between crown ethers and these two radicals. The presence of cations in solution has negligible effect on the rate constants for OH and SO. However, for NO, the rate constants is not in proportional to H-atom number in crown ethers, and the 12-crown-4 is most reactive compared with the others. For the studied crown ethers, the rate constants of these oxidative radicals have the order: OH SO NO. This is the first report on the kinetic behavior of crown ethers with NO, and it would be helpful for the understanding of stability of crown ethers in the nuclear fuel reprocessing.
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:28 Percentile:72.42(Astronomy & Astrophysics)We report on the event structure and double helicity asymmetry () of jet production in longitudinally polarized collisions at = 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 = -0.0014 0.0037 at the lowest bin and -0.0181 0.0282 at the highest bin. The measured is compared with the predictions that assume various distributions.
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:176 Percentile:99.41(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.
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:7 Percentile:49.81(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.
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:169 Percentile:98.47(Astronomy & Astrophysics)The PHENIX experiment at RHIC has measured the invariant differential cross section for production of , , and mesons in collisions at = 200 GeV. The spectral shapes of all hadron transverse momentum distributions are well described by a Tsallis distribution functional form with only two parameters, and , determining the high and characterizing the low 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.
Qiu, J.*; Zhai, M.*; Chen, J.; Wang, Y.*; Peng, J.*; Xu, L.*; Li, J.*; Wei, G.*
Journal of Membrane Science, 342(1-2), p.215 - 220, 2009/10
Times Cited Count:74 Percentile:91.21(Engineering, Chemical)A novel ETFE-based amphoteric ion exchange membrane (AIEM) was prepared through a two-step radiation induced grafting technique. ETFE film was first grafted with styrene (St) (denoted as ETFE--PS), followed with a sulfonation treatment to obtain a cation exchange membrane (ETFE--PSSA). The ETFE--PSSA membrane was subsequently grafted with dimethylaminoethyl methacrylate (DMAEMA) and then protonated, resulting in an AIEM with both anionic and cationic groups. The obtained AIEM exhibited high ion exchange capacity (IEC) and conductivity, as well as significantly reduced permeability of vanadium ions. Vanadium redox flow battery (VRFB) assembled with the AIEM maintained an open circuit voltage (OCV) higher than 1.3V after placed for 300h, and exhibited higher columbic efficiency and energy efficiency than that with Nafion117 membrane.
Qiu, J.*; Zhang, J.*; Chen, J.; Peng, J.*; Xu, L.*; Zhai, M.*; Li, J.*; Wei, G.*
Journal of Membrane Science, 334(1-2), p.9 - 15, 2009/05
Times Cited Count:86 Percentile:93.19(Engineering, Chemical)Poly(vinylidene difluoride) (PVDF) film was grafted with styrene (St) and dimethylaminoethyl methacrylate (DMAEMA) using irradiation techniques. Through subsequent sulfonation and protonation processes, a new kind of amphoteric ion exchange membrane (AIEM) was synthesized. The grafting yield () increased with absorbed dose and leveled off at about 60 kGy. The properties of the AIEM strongly depended on the composition and of the film, i.e. higher content of DMAEMA brought lower permeability of vanadium ions and conductivity. Finally, an AIEM was assembled and tested in the vanadium redox flow battery (VRFB) system. It was found that the VRFB assembled with the AIEM maintained an open circuit voltage (OCV) higher than 1.2V after placed for 68h, which was much longer than that with the Nafion117 membrane. Therefore, this work provides a novel method to develop potential substitute of Nafion membranes to be applied in VRFB system.
Xu, L.*; Yue, Z.*; Wang, M.*; Zhai, M.*; Yoshii, Fumio; Seko, Noriaki; Peng, J.*; Wei, G.*; Li, J.*
Nuclear Instruments and Methods in Physics Research B, 265(1), p.394 - 398, 2007/12
Times Cited Count:5 Percentile:40.99(Instruments & Instrumentation)A water insoluble cellulose derivative, hydroxypropyl methylcellulose phthalate (HPMCP) hydrogels, was converted to Na type to form hydrogel in paste-like status by radiation crosslinking. Mechanism for radiation crosslinking of cellulose-derivatives in paste-like status was discussed. Crosslinkers, i.e., methyl -bis-acrylamide (MBA) or ethyleneglycol dimethacrylate (EGDMA) has been used to decrease gelation dose (Dg) of synthesis HPMCP hydrogels and improve its mechanical properties. MBA was found to be more effective for accelerating the crosslinking of HPMCP than EGDMA. Swelling degree of HPMCP hydrogel in many kinds ofsalt solutions followed Hofmeister series, which is ubiquitous in polyelectrolyte hydrogel. Specific reswelling was observed in concentrated KF solution, implying a very strong F binding ability of benzyl group. The comprehensive results obtained in this study will be utilized on the design of HPMCP-based controlled release system.
Chen, L.-M.; Nakajima, Kazuhisa; Hong, W.*; Hua, J. F.*; Kameshima, Takashi; Kotaki, Hideyuki; Sugiyama, Kiyohiro*; Wen, X.*; Wu, Y.*; Tang, C.*; et al.
Chinese Optics Letters, 5(S1), p.S133 - S135, 2007/05
Chen, L.-M.; Kotaki, Hideyuki; Nakajima, Kazuhisa*; Koga, J. K.; Bulanov, S. V.; Tajima, Toshiki; Gu, Y. Q.*; Peng, H. S.*; Wang, X. X.*; Wen, T. S.*; et al.
Physics of Plasmas, 14(4), p.040703_1 - 040703_4, 2007/04
Times Cited Count:36 Percentile:75.67(Physics, Fluids & Plasmas)An experiment for the laser self-guiding studies has been carried out with 100 TW laser pulse interaction with the long underdense plasma. Formation of extremely long plasma channel with its length, about 10 mm, 20 times above the Rayleigh length is observed. The self-focusing channel features such as the laser pulse significant bending and the electron cavity formation are demonstrated experimentally for the first time.
Fujita, Takaaki; Aniel, T.*; Barbato, E.*; Behn, R.*; Bell, R. E.*; Field, A. R.*; Fukuda, Takeshi*; Gohil, P.*; Ida, Katsumi*; Imbeaux, F.*; et al.
Europhysics Conference Abstracts, 27A, 4 Pages, 2003/00
no abstracts in English
Koga, J. K.; Chen, L.-M.; Kotaki, Hideyuki; Nakajima, Kazuhisa; Bulanov, S. V.; Tajima, Toshiki; Gu, Y. Q.*; Peng, H. S.*; Hua, J. F.*; An, W. M.*; et al.
no journal, ,
First experiments for electron acceleration with the laser-gas plasma interaction have been carried out with 30 fs, 100 TW relativistic Ti:Sapphier laser pulse into a long slit (1.2 10 mm) gas plasma. The 10 mm length plasma channel formed that was longer than 20 times the Rayleigh length. Plasma density was the key factor for this long channel stimulation under 100 TW laser pulse irradiation that was much higher than critical power for relativistic self-focusing. For the first time, channel characteristics such as laser bending, hosing and cavity formation were demonstrated experimentally. In case of long channel guiding, accelerated electron bunch was tightly collimated with low emmitance mm mrad and quasi-monoenergetic electron bunch ( 70 MeV) was obtained as well. Accelerated electron charge current with electron energy 1 MeV was 10 nC/shot which was highest value in laser accelerator, to our knowledge, and ascribed to the contribution of long plasma channel. These well controlled laser-driven acceleration is an important cornerstone of relativistic engineering.
Peng, J.; Cai, D.*; Hao, Y.*; Zhai, M.*; Lin, M.; Katsumura, Yosuke
no journal, ,
1-butyl-3-methylimidazolium chloride ([Bmim]Cl) ionic liquid has demonstrated good solubility for cellulose without derivation. In this work, the radiation effects on microcrystalline cellulose (MCC) in [Bmim]Cl has been investigated by measuring the molecular weight of MCC after -ray irradiation. The radiation-induced degradation kinetics of MCC was studied and Gd value of MCC was calculated.
Peng, J.; Wan, L. K.*; Lin, M.; Yan, Y.*; Muroya, Yusa*; Katsumura, Yosuke
no journal, ,
Peng, J.; Hao, Y.*; Hu, S.*; Lin, M.; Katsumura, Yosuke
no journal, ,
The thermal stability of 1-allyl-3-methylimidazolium chloride ionic liquid ([Amim]Cl) was studied by using isothermal thermogravimetric analysis and TG/MS. In addition, the radiation stability of [Amim]Cl was investigated by using UV and NMR. During the heating process, the allyl side chain of [Amim]Cl appears to associate with anion Cl and dissociate from imidazole ring with equal probability as the methyl group does. During the irradiation, although the darkening of color in irradiated [Amim]Cl was observed, the chemical structure of [Amim]Cl is stable at dose of 500 kGy under nitrogen atmosphere.
Wan, L. K.*; Peng, J.; Lin, M.; Muroya, Yusa*; Katsumura, Yosuke
no journal, ,
The transient absorption spectra of crown ethers in aqueous solution are studied using KrF (248 nm) laser photolysis. Moreover, the rate constants for the reaction of SO radicals with crown ethers are determined. By laser photolysis, the rate constants of the reactions of SO radical with 18-crown-6(18C6), 15-crown-5(15C5) and 1,4-dioxane, have been determined to be 2.510, 2.210 and 4.210 Ms, respectively. The values increase with increasing the size of the ethers and K and Na has no obvious effect on the reactivity.
Lin, M.; Katsumura, Yosuke*; Muroya, Yusa*; Yamashita, Shinichi; Yan, Y.*; Hata, Kuniki; Peng, J.
no journal, ,
With a re-evaluation of the extinction coefficients of solvated electron in 1,2-ethanediol (12ED), 1,2-propanediol (12PD), 1,3-propanediol (13PD), and glycerol (GLY), the time-dependent radiolytic yields of the solvated electron in these diols from the picosecond to the microsecond time range are described. The radiolytic yield of solvated electron in these viscous solvents is found to be quite different from that in aqueous solution. The temperature dependent absorption spectra of the solvated electron in 12ED, 12PD, 13PD, and GLY have been also investigated. Very interestingly, the red-shift of the spectrum with increasing temperature corresponds very well with the spectral shift of electron solvation obtained by femtosecond laser photolysis.