排序方式: 共有34条查询结果,搜索用时 31 毫秒
1.
R. E. Ansorge B. ?sman C. N. Booth L. Burow P. Carlson R. S. De Wolf B. Eckart G. Ekspong C. Fuglesang J. Gaudaen C. Geich-Gimbel B. Holl R. Hospes K. Jon-And D. P. Johnson F. Lotse N. Manthos D. J. Munday J. E. V. Ovens W. Pelzer J. G. Rushbrooke F. Triantis L. Van hamme C. Walck C. P. Ward D. R. Ward C. J. S. Webber T. O. White G. Wilquet N. Yamdagni UA Collaboration 《Zeitschrift fur Physik C Particles and Fields》1988,41(2):179-190
A detailed analysis ofK s 0 production in \(\bar pp\) |<2.5 the average transverse momentum is found to be 0.53±0.07 GeV/c at 200 GeV and 0.62±0.08 GeV/c at 900 GeV, which is an increase with respect to data at c.m. energies below 60 GeV. TheK s 0 production cross sections in inelastic collisions are 29±4 mb at 200 GeV and 63±6 mb at 900 GeV, showing an increase compared to lower energy data. The central kaon density is found to increase as a logarithmic function of energy. At 900 GeV, where statistics are sufficient to allow one to draw conclusions, the average transverse momentum is higher in events with large charged multiplicity than in events with low multiplicity. 相似文献
2.
Oganesyan VS Barclay JE Hardy SM Evans DJ Pickett CJ Jayasooriya UA 《Chemical communications (Cambridge, England)》2004,(2):214-215
The potential of NIS spectroscopy to study the iron-sulfur clusters in metalloproteins is illustrated using model compounds. The origin of the intense low energy transfer bands is discussed. 相似文献
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R. E. Ansorge B. ?sman L. Burow P. Carlson R. S. DeWolf B. Eckart G. Ekspong I. Evangelou C. Fuglesang J. Gaudaen C. Geich-Gimbel B. Holl K. Jon-And F. Lotse N. Manthos D. J. Munday W. Pelzer J. G. Rushbrooke F. Triantis L. Van Hamme C. Walck C. P. Ward D. R. Ward C. J. S. Webber T. O. White G. Wilquet N. Yamdagni UA Collaboration 《Zeitschrift fur Physik C Particles and Fields》1989,43(3):357-374
Multiplicity distributions of charged particles produced in non single-diffractive collisions between protons and antiprotons at centre of mass energies of 200 and 900 GeV are presented. The data were recorded in the UA5 streamer chambers at the CERN Collider, which was operated in a pulsed mode between the two energies. A new method to correct for acceptance limitations and inefficiencies based on the principle of maximum entropy has been used. Multiplicity distributions in full phase space and in intervals of pseudorapidity are presented in tabular form. The violation of KNO scaling in full phase space found by the UA5 group at an energy of 546 GeV is confirmed also at 200 and 900 GeV. The shape of the 900 GeV distribution in full phase space is narrower in the peak region than at 200 GeV but exhibits a pronounced high multiplicity tail. The negative binomial distribution fits data at 200 GeV in all pseudorapidity intervals and in small intervals at 900 GeV. In large intervals at 900 GeV, however, the negative binomial distribution. Fits to the partially coherent laser distribution are also presented as well as comparisons with predictions of the Dual Parton, the Fritiof and the Pythia models. 相似文献
5.
The hyperfine coupling tensors of muonated radicals in a large single crystal of benzophenone have been determined by measuring
the hyperfine couplings of the radicals as the crystal was rotated about three orthogonal axes.
Signals from four radicals were observed, corresponding to the four molecules per unit cell in the crystal. Due to an ambiguity
in the data we are unable to discriminate between two similar hyperfine coupling tensors. Both lead to an isotropic hyperfine
coupling of \sim32 MHz, contrasting with the solution value of 42 MHz obtained earlier in diethyl ether. The anisotropic components
of the tensor are relatively large, at approximately -15 MHz, -6 MHz and 21 MHz, respectively.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
6.
The potential of μSR in the investigation of molecular dynamics of organometallic compounds is illustrated with applications to the classic metallocene compound, ferrocene. Muonium addition gives two radicals in this case with the slowly relaxing radical showing a repolarisation curve corresponding to a hyperfine field of ca. 200 G suggesting addition to the cyclopentadienyl ring. The temperature dependence of the relaxation of this radical gives an activation energy of ca. 5.4 kJ/mol, in good agreement with QENS and NMR estimates for cyclopentadienyl, ring rotation in this compound. 相似文献
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Cannon RD Jayasooriya UA Tilford C Anson CE Sowrey FE Rosseinsky DR Stride JA Tasset F Ressouche E White RP Ballou R 《Inorganic chemistry》2004,43(22):7061-7067
The mixed-valence double salt K(3)(MnO(4))(2) crystallizes in space group P2(1)/m with Z = 2. The manganese centers Mn1 and Mn2 constitute discrete "permanganate", [Mn(VII)O(4)](-), and "manganate", [Mn(VI)O(4)](2-), ions, respectively. There is a spin-ordering transition to an antiferromagnetic state at ca. T = 5 K. The spin-density distribution in the paramagnetic phase at T = 10 K has been determined by polarized neutron diffraction, confirming that unpaired spin is largely confined to the nominal manganate ion Mn2. Through use of both Fourier refinement and maximum entropy methods, the spin on Mn1 is estimated as 1.75 +/- 1% of one unpaired electron with an upper limit of 2.5%. 相似文献
9.
Upali A. Jayasooriya Roderick D. Cannon Christopher E. Anson Elisha Karu Ahmed K. Saad John P. Bourke Gordon J. Kearley Ross P. White 《Angewandte Chemie (International ed. in English)》1998,37(3):317-320
Intrinsic and extrinsic forces behind the distortion in metal atom clusters can be readily distinguished provided that the clusters are embedded in a suitable ligand environment and that the tunneling of the protons in the peripheral ligands is then analyzed by inelastic neutron scattering. For the [Cr3O(OOCCH3)6(H2O)3]Cl⋅6 H2O model system studied, the tunneling process is very sensitive to the local environment. Thus a tool is available to allow a better assessment of the cause of structural distortions. 相似文献
10.
Paul H. Dallin Upali A. Jayasooriya Brian F. Johnson Jack Lewis Stephen F. J. Cox Christopher A. Scott Elisabeth Marseglia 《Hyperfine Interactions》1991,64(1-4):715-719
μSR spectra from a metal carbonyl compound are reproted for the first time. The metal cluster compound Cs2[Os10C(CO)24] shows a temperature dependent signal for implanted muons with the onset of motional narrowing at ca. 200 K. Also observed
is a probable change in the width within the temperature range 40–140 K. A tentative assignment is provided for the muon sites. 相似文献