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排序方式: 共有125条查询结果,搜索用时 94 毫秒
91.
92.
F. Bergsma J. Dorenbosch M. Jonker C. Nieuwenhuis J. V. Allaby U. Amaldi G. Barbiellini L. Barone A. Capone W. Flegel L. Lanceri M. Metcalf J. Panman R. Plunkett C. Santoni K. Winter I. Abt J. Aspiazu F. W. Büsser H. Daumann P. D. Gall T. Hebbeker F. Niebergall P. Schütt P. Stähelin V. Gemanov P. Gorbunov E. Grigoriev V. Kaftanov V. Khovansky A. Rosanov A. Baroncelli R. Biancastelli B. Borgia C. Bosio M. Diemoz U. Dore F. Ferroni E. Longo L. Luminari P. Monacelli F. de Notaristefani L. Tortora V. Valente CHARM Collaboration 《Zeitschrift fur Physik C Particles and Fields》1984,24(3):217-218
A search for fractionally chargedQ=1/3 (2/3) particles of different properties of interaction produced in (anti)neutrino-nucleus and in protonnucleus collisions was performed using the scintillator system of the CHARM neutrino detector at the CERN SPS. No events of the cases considered were found. In (anti)neutrino beams production was found to be less than a few times 10?5 per interaction of a beam particle. In a proton beam an upper limit on the production cross section of ~10?40 cm2 was obtained. 相似文献
93.
M. Baubillier I.J. Bloodworth G.J. Bossen A. Burns J.N. Carney C.A. Cowan G.F. Cox U. Dore Ph. Gavillet J.B. Kinson F. Levy P.F. Loverre H. McCann M. MacDermott P.J. Negus B.H. Oh M. Pratap R. Zitoun 《Physics letters. [Part B]》1979,89(1):131-135
Backward production of ω(1670) is observed in the reactions K?p→φ+φ?ω0Λ0 and K?p→φ+φ?φ0φ0 for |U'Λ|<1.0 GeV2. The cross section for the ω(1670) →φ+φ?ω0 decay mode is 1.90±0.35 μb for 8.25 GeV/c incident K?. Evidence is presented for the importance of the sequential decay, ω(1670) → Bφ → ωφφ with a branching ratio ω(1670) → Bφ/all ω(1670) → ωφφ=1.0±0.250.00. 相似文献
94.
95.
We report on the self and pressure broadening of the J=9←8 transition of O12CS and O13CS and the J+1←J, with J=0, 1, 2, 3, rotational transitions of 12CO and 13CO. In particular, the J=9← 8 of OCS and J=1← 0 of CO have been investigated for a detailed comparison of lineshape models in the analysis of natural and modulated line profiles. Since the frequency modulation technique improves the instrumental sensitivity, allowing the study of weak transition line profiles, a thorough test of this technique applied to lineshape analysis has been carried out. Finally, the self and pressure broadening coefficients are also given. Due to the important role covered by CO in the atmospheric chemistry field, we have paid particular attention to the N2 and O2 broadening. 相似文献
96.
A vapour-deposited sample of amorphous CCl4 at 10 K has been studied by neutron diffraction. The measured structure factor confirms that the basic molecular unit is retained in the amorphous phase and a form-factor fit to the high Q-value data gives a CCl bond length of (1.770±0.002) Å. The inter-molecular function, DM(Q) shows more structure than for the liquid phase and transformation to a real-space distribution function confirms that this is due to a much stronger orientational correlation between adjacent molecules in the amorphous solid. The density is found to be (25±5)% higher than in the liquid and the structural properties can be well described using a reference interaction site model (RISM). 相似文献
97.
P. Dore A. Paolone S. Tatoni C. P. Varsamis V. Boffa C. Romeo S. Barbanera F. Murtas 《International Journal of Infrared and Millimeter Waves》1994,15(4):723-738
We measured reflectance spectra R(v) of oxygen deficient Y1Ba2Cu3O7–x (YBCO) films of different thickness, with critical temperatures between 85 and 87 K. Measurements were made at room temperature between 15 and 25000 cm–1. The measured R(v) have a maximum below 100 cm–1 and then decrease for v 0. This low frequency behaviour of R(v) can be accounted for by considering a relevant extra-Drude contribution to the far infrared optical conductivity of YBCO. 相似文献
98.
The 1- and 4-hydrazino[1]benzothiéno[2,3-d]pyridazines have been cyclised to form triazolobenzothienopyridazines, tetrazolobenzothienopyridazines and benzothienopyridazinotriazines. NMR study shows a tautomeric equilibrium in solution between tetrazolo [1,5-b][1]benzothiéno[3,2-d] pyridazine and 1- azido [1]benzothieno[2,3-d]pyridazine. Reactions of the benzothienopyridazinotriazones with hydrazine were studied. 相似文献
99.
The substitution and addition reactions of the 2H[1]benzothiéno[2,3-d]phyridazinethione-1 and the 3H[1]benzothiéno[2,3-d]pyridazinethione-4 gave N- or S-substituted derivatives whose structures were identified by 1R and NMR spectroscopy. 相似文献
100.
J. Even L. Pedesseau F. Dore S. Boyer-Richard 《Optical and Quantum Electronics》2008,40(14-15):1233-1238
An efficient mechanical and electronic axial approximation of the strained 8 × 8 Hamiltonian is proposed for zinc-blende nanostructures with a cylindrical shape on (100) substrates. Vertically stacked InAs/InP columnar quantum dots (CQDs) for polarization insensitive semiconductor optical amplifier (SOA) in telecommunications applications are studied theoretically. Non-radiative Auger processes in InAs/InP quantum dots (QDs) are also investigated. It is shown that a multiband approach is necessary in both cases. 相似文献