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排序方式: 共有71条查询结果,搜索用时 15 毫秒
61.
J. V. Allaby U. Amaldi G. Barbiellini M. Baubillier F. Bergsma A. Capone W. Flegel F. Grancagnolo L. Lanceri M. Metcalf C. Nieuwenhuis R. Pain J. Panman R. Plunkett K. Winter I. Abt J. Aspiazu A. Büngener F. W. Büsser P. D. Gall T. Hebbeker F. Niebergall P. Schütt P. Stähelin P. Gorbunov E. Grigoriev V. Khovansky A. Rosanov B. Borgia M. Diemoz C. Dionisi U. Dore F. Ferroni E. Longo P. F. Loverre L. Luminari P. Monacelli S. Morganti F. de Notaristefani C. Santoni CHARM Collaboration 《Zeitschrift fur Physik C Particles and Fields》1988,38(3):403-410
New measurements of the total crosssections of charged-current interactions of muonneutrinos and antineutrinos on isoscalar nuclei have been performed. Data were recorded in an exposure of the CHARM detector in an 160 GeV narrow-band beam. The antineutrino flux was determined from the measurements of the pion and kaon flux, and independently from the muon flux measured in the shield; the two methods are found to agree. The neutrino flux was determined from the muon flux ratio forv μ and \(\bar v_\mu \) runs which was normalized to the antineutrino flux. The cross-section slopes thus determined are $$\begin{gathered} \sigma _T^{\bar v} /E = (0.335 \pm 0.004(stat) \hfill \\ \pm 0.010(syst)).10^{ - 38} cm^2 /(GeV \cdot nucleon) \hfill \\ \sigma _T^v /E = (0.686 \pm 0.002(stat) \hfill \\ \pm 0.020(syst)).10^{ - 38} cm^2 /(GeV \cdot nucleon) \hfill \\ \end{gathered} $$ The momentum sum of the quarks in the nucleon and the ratio of sea quark to total quark momentum are derived from the measurements. 相似文献
62.
J. Dorenbosch J. V. Allaby U. Amaldi G. Barbiellini F. Bergsma A. Capone W. Flegel L. Lanceri C. Nieuwenhuis J. Panman C. Santoni K. Winter I. Abt J. Aspiazu F. W. Büsser H. Daumann P. D. Gall T. Hebbeker F. Niebergall P. Schütt P. Stähelin P. Gorbunov E. Grigoriev V. Khovansky S. Krutchinin A. Maslennikov A. Rosanov L. Barone B. Borgia M. Diemoz U. Dore F. Ferroni E. Longo L. Luminari P. Monacelli F. de Notaristefani R. Santacesaria V. Valente The CHARM Collaboration 《Zeitschrift fur Physik C Particles and Fields》1988,40(4):497-522
A new beam-dump experiment has been performed at the CERN Super Proton Synchrotron using the CHARM neutrino detector. The instrumentation and the statistics have been significantly improved with respect to earlier experiments. For a neutrino energy above 20 GeV the asymmetry of the prompt muon-neutrino and electron-neutrino fluxes \([(v_\mu + \bar v_\mu ) - (v_e + \bar v_e )]/[(v_\mu + \bar v_\mu ) + (v_e + \bar v_e )]\) is found to be 0.20±0.10 (stat.)±0.05 (syst.), and the asymmetry of prompt antineutrino and neutrino fluxes for muonneutrinos \((v_\mu - \bar v_\mu )/(v_\mu + \bar v_\mu )\) is 0.02±0.16 (stat.)±0.02 (syst.) in agreement with our previous results. For the cross-section times branching ratio for charm production and semileptonic decay we obtain a value of \(\sigma \times BR\left[ {D(\bar D) \to v_e (\bar v_e ) X} \right] = 1.9 \pm 0.2 \pm 0.2\mu b\) per nucleon. We find no evidence forv τ orv x interactions. The \((v_\tau + \bar v_\tau )\) flux is less than 21% of the total prompt neutrino flux. We derive an improved limit on the branching ratio \(\pi ^0 \to v\bar v\) of 6.5×10?6, and as a verification of the universality of the neutral weak coupling we find \(g_{v_e \bar v_e } /g_{v_\mu \bar v_\mu } = 1.05_{ - 0.18}^{ + 0.15} \) . 相似文献
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65.
H.M. Fijnaut C. Pathmamanoharan E.A. Nieuwenhuis A. Vrij 《Chemical physics letters》1978,59(2):351-355
From the scattered intensity as a function of scattering wave number, local ordering in concentrated latex dispersions in benzene is found. From the combination of intensity and photon correlation experiments follows the existence of strong hydrodynamic interactions between the dispersed particles. 相似文献
66.
Franti
ek Hartl Maxim P. Aarnts Heleen A. Nieuwenhuis Joris van Slageren 《Coordination chemistry reviews》2002,230(1-2)
The photochemical reactivity, photophysical properties and redox behavior of the complexes trans,cis-[Ru(X)(X′)(CO)2(α-diimine)] and their derivatives are strongly dependent on the complex geometry, the nature and electronic properties of the α-diimine ligand and, most importantly, on the axial ligands X and X′ (alkyl, halide, phosphine, donor solvent, etc.). This paper deals mainly with comparison of reduction pathways for several different types of the trans,cis-[Ru(X)(X′)(CO)2(α-diimine)] complexes, also presenting some new results in this field. An equally important goal has been the comparison and discussion of the photo- and redox reactivity of these complexes from the viewpoint of the frontier orbitals involved and character of the Ru---X/X′ bonding. 相似文献
67.
J. W. Nieuwenhuis 《Journal of Optimization Theory and Applications》1982,36(2):289-301
We will prove that, in the case where all the domination cones are closed and convex, have a nonempty interior, and are totally ordered with respect to inclusion, the set of weakly nondominated outcomes of a nonempty convex compact setY
R
n
is connected. Further, we give a relationship between weakly nondominated and nondominated solutions.The author would like to thank the referees for their valuable comments. 相似文献
68.
Abbott T Akiba Y Alburger D Beavis D Betts RR Birstein L Bloomer MA Bond PD Chasman C Chu YY Cole BA Costales JB Crawford HJ Cumming JB Debbe R Duek E Engelage J Fung SY Grodzins L Gushue S Hamagaki H Hansen O Hayashi S Homma S Huang HZ Ikeda Y Katcoff S Kaufman S Kimura K Kitamura K Kurita K Ledoux RJ Levine MJ Miake Y Morse RJ Nagamiya S Olness J Parsons CG Remsberg LP Sarabura M Shor A Stankus P Steadman SG Stephans GS Sugitate T Tannenbaum MJ Torikoshi M van Dijk JH Videbaek F Vient M 《Physical review letters》1990,64(8):847-850
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