共查询到20条相似文献,搜索用时 46 毫秒
1.
H. Albrecht U. Binder G. Harder A. Philipp W. Schmidt-Parzefall H. Schröder H.D. Schulz R. Wurth A. Drescher B. Gräwe U. Matthiesen H. Scheck J. Spengler D. Wegener K.R. Schubert J. Stiewe R. Waldi H. Gennow 《Physics letters. [Part B]》1985,158(6):525-530
Using the ARGUS detector at DORIS II, we have observed a signal of 36.7±8.0 events in the decay channel D0→Ks0φ. In the same data sample, we have observed the well established decay D0→Ks0π+π?, and find the ratio, , to be 0.186±0.052. The substantial value of (0.99±0.32±0.17)% then derived for the branching ratio for gives direct evidence that W exchange contributes D0 decay. 相似文献
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3.
The (1-0), (2-0), and (3-0) transitions of 15N16O and 15N18O are investigated. The wavenumbers of the rotation-vibration lines are reported for the overtone bands and the (1-0) subband. It is shown that in the data reduction it is advantageous to calculate first merged spectroscopic constants ignoring the Λ-type doubling. The vibrational constants ωe, ωexe, ωeye and the vibrational dependence of the rotational constants are determined. The study of 15N18O allows the determination of the equilibrium values of the centrifugal distortion correction ADe to the spin-orbit constant and of the spin-rotation constant γe from the isotopic invariance of the ratios and . It is found that and . 相似文献
4.
F.E. Close 《Physics letters. [Part B]》1973,43(5):422-426
The small ω′ behaviour of F2en/F2ep and the apparent difference in the q2 dependences of the magnetic form factor of the proton and of the transition to Δ+(1236) are quantitatively correlated in a model where nucleon consistes of a quarks and a scalar or vector core. The proton and Δ transition form factors suggest that only the scalar core contributes at large q2 and small ω′. As a result the ω′ dependence of is obtained for ω′ < 3 and predictions for the weak structure functions and polarisation asymmetries at smallω′ are presented. We predict asymmetries and also expect that as q2→∞. 相似文献
5.
We consider the class of non-integrable, non-linear equations, in 1+1 dimensions. We seek rational solutions K(ω1,ω2), which we call bi-solitons, with exponential type variables ωi = exp(γix + ρit). In this paper, we restrict to q = 2 and 3, and investigate the general q case in the following paper. We find that these bi-solitons exist when the operator Lq (with ± ?) can be factorized as the product of smaller order differential operators. Besides the trivial factorized bi-solitons, we show that there exist non-trivial ones whenever K may be written as Σlmaxx ωl2Fl(Z = ω1 + ω2). In order to understand the origin of the factorization property, to any polynomial K = Σωl2Fl(Z) we associate a linear transformation such that LqK has only the power ωl2 of K2. For q = 2 and 3, we find that there exist particular polynomials of this type restraining Lq to be a product of smallr order operators. For the full non-linear equations we verify that all the bi-solitons can be obtained from these particular polynomials. 相似文献
6.
H. Taureg G. Zech F. Dydak F.L. Navarria P. Steffen J. Steinberger H. Wahl E.G.H. Williams C. Geweniger K. Kleinknecht 《Physics letters. [Part B]》1976,65(1):92-96
The branching ratio has been determined to be (2.68±0.15)×10?3 for photon energies greater than 50 MeV in the KS0 rest frame. The decay KS0→π+π?γ is found to be dominated by the internal bremsstrahlung transition. The branching rato of a possible direct transition is found to be less than 0.06 × 10?3 at 90% confidence level for . 相似文献
7.
《Physica A》1995,216(4):445-451
8.
D. Denegri Y. Pons R. Barloutaud A. Borg C. Louedec M. Spiro K. Paler T.P. Shah S.N. Tovey B. Chaurand B. Drevillon G. Labrosse R. Lestienne R.A. Salmeron 《Nuclear Physics B》1975,91(1):54-68
We have studied the reaction K-p → K-π+π-π+π-p at 14.3 GeV/c to search for evidence of the double dissociation process . In the channel π1-π2-Δ++ (1236) there is evidence for simultaneous production of low-mass enhancements in the and Δ++(1236)π2- subsystems which correspond to the and decay modes. In this particular final state the double fragmentation system is produced with a cross section of the order of a few microbarns. Our data are consistent with the factorizable pomeron exchange model of double diffractive dissociation. 相似文献
9.
K. Alpgård G. Ekspong P.O. Hulth U. Svedin N. Yamdagni F.O. Breivik A.G. Frodesen A. Krogstad V.-M. Hagman V. Karimäki P. Villanen 《Nuclear Physics B》1976,103(2):234-246
Inclusive cross sections are presented for strange-particle production in proton-proton interactions at 19 GeV/c for the pairs and for Λ, Ks0, Σ+, Σ? and Ξ?. The , the KY and the total strange particle cross sections have been found to be 1.40 ± 0.10 mb, 2.69 ± 0.09 mb and 4.23 ± 0.20 mb, respectively. The charged multiplicity distributions for events with Ks0, Λ, or K0 Λ are shown to follow a modified KNO curve, whereas K+ Λ does not. For the inclusive reactions , we find that the average charged multiplicity of the remainder system X++ is the same as when X++ is produced in other reactions with the same system energy and quantum numbers. 相似文献
10.
L Nemes 《Journal of Molecular Spectroscopy》1978,72(1):102-123
Medium resolution infrared grating spectra of gaseous ketene, H2CCO were recorded between 1000 and 400 cm?1, both at instrument temperature (40°C) and with cooling (?40°C). Interferometric Fourier spectra were also measured at ?70°C with resolution 0.22 cm?1 between 450 and 330 cm?1. The K structure of the fundamentals ν5, ν6, ν8, and ν9 was assigned. These fundamentals are coupled by a-axis Coriolis interactions. These couplings were analysed on the symmetric top basis for setting up the perturbation matrix and by utilizing the K-dependent Coriolis shifts of levels. A preliminary analysis of the Coriolis intensity anomalies was also undertaken.Band center values from combination differences are and . Synthetic spectra indicate the band origins of ν8 and ν9 to be close to 977.8 and 439.0 cm?1, respectively. Estimates of Coriolis coupling constants obtained from synthetic spectra are , , , and . Approximate ratios of unperturbed vibrational transition moments obtained from spectral simulations are . 相似文献
11.
Small-angle scattering of long wavelength neutrons from an Fe65Ni35 single crystal has been measured with the applied magnetic field (6.2 kG) parallel and perpendicular to the scattering vector of the elastic scattering over the temperature range from 25 to 422°C (Tc = 227°C). The scattering cross sections due to the longitudinal spin fluctuation have been analyzed by means of Guinier's approximation , where the forward cross section (dσ/dω)0 is proportional to n, which is the number of atoms in a paramagnetic cluster, and Rg is the radius of gyration of the cluster. The empirical relation between n and Rg is = 0.298 × Rg2.34 to be compared with that calculated for a simple spherical cluster model n = 1.274 Rg3. 相似文献
12.
The mutual perturbations of the A1Σu+ and b0u+ states of As2 are due to a strong spin-orbit interaction. The numerical treatment of these perturbations leads to the following parameters:
40 806 (3) | 297 (2) | 5.1 (2) | 0.0798 (12) | |
38 884 (3) | 422 (1) | 8.8 (1) | 0.0783 (12) |