共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
Recently [see V.V. Anisovich et al., Yad. Fiz. 63, 1489 (2000)], the K-matrix solutions for the wave IJ
PC=00++ were obtained in the mass region 450–1900 MeV, where four resonances f
0(980), f
0(1300), f
0(1500), f
0(1750) and the broad state f
0(1530
−250
+90
) are located. Based on these solutions, partial widths are determined for scalar-isoscalar states decaying into the channels
ππ, KK
ηη, ηη′, ππππ and corresponding decay couplings.
From Yadernaya Fizika, Vol. 65, No. 8, 2002, pp. 1583–1590.
Original English Text Copyright ? 2002 by Anisovich, Nikonov, Sarantsev.
This article was submitted by the authors in English. 相似文献
3.
We have generated thep-cyanobenzyl radical in supersonic free expansion, and measured the vibrationally and rotationally resolved laser induced fluorescence (LIF) excitation spectra and the LIF dispersed spectra from the single vibronic levels (SVL) in the green-blue region. The lowest energy band at 20 738 cm−1with the strongest intensity in the excitation spectrum has been assigned to the 000band of the visible spectrum, on the basis of the vibronic structures in the SVL dispersed spectra. Based on the band type of the 000band,a-type, determined from the rotationally resolved LIF excitation spectrum, we have definitely assigned the visible band to theD122B1–D012B1electronic transition. We have found, on the grounds of the vibrational analysis of the dispersed spectra, that the vibronic structure of the 22B1–12B1electronic transition of the benzyl type is characterized by totally symmetric fundamental modes, 1, 8a, and 9a. 相似文献
4.
V. Kleber 《Progress in Particle and Nuclear Physics》2003,50(2):1115-559
A program to investigate the light scalar resonances a0(980)/ƒ0(980) in hadronic interactions via their decay into the πη and
channels has started at the ANKE spectrometer of COSY-Jülich. As the first step the reactions pp → dπ+X and pp → dK+X have been measured at two energies, Tp = 2.65 GeV and 2.83 GeV. The status of the analysis at Tp = 2.65 GeV is presented. A total cross section of about 50 nb has been determined for the reaction
. 相似文献
5.
A. A. Ivanov 《Communications in Mathematical Physics》2011,307(1):1-16
The Majorana representations of groups were introduced in Ivanov (The Monster Group and Majorana Involutions, 2009) by axiomatising some properties of the 2A-axial vectors of the 196 884-dimensional Monster algebra, inspired by the sensational classification of such representations
for the dihedral groups achieved by Sakuma (Int Math Res Notes, 2007). This classification took place in the heart of the theory of Vertex Operator Algebras and expanded earlier results by Miyamoto
(J Alg 268:653–671, 2003). Every subgroup G of the Monster which is generated by its intersection with the conjugacy class of 2A-involutions possesses the (possibly unfaithful) Majorana representation obtained by restricting to G the action of the Monster on its algebra. This representation of G is said to be based on an embedding of G in the Monster. So far the Majorana representations have been classified for the groups G isomorphic to the symmetric group S
4 of degree 4 (Ivanov et al. in J Alg 324:2432–2463, 2010), the alternating group A
5 of degree 5 (Ivanov AA, Seress á in Majorana Representations of A
5, 2010), and the general linear group GL
3(2) in dimension 3 over the field of two elements (Ivanov AA, Shpectorov S in Majorana Representations of L
3(2), 2010). All these representations are based on embeddings in the Monster of either the group G itself or of its direct product with a cyclic group of order 2. The dimensions and shapes of these representations are given
in the following table: 相似文献
6.
We use a non-perturbative approach which combines coupled channel Lippmann-Schwinger equations with meson-meson potentials provided by the lowest order chiral Lagrangian. By means of one parameter, a cut off in the momentum of the loop integrals, which results of the order of 1 GeV, we obtain singularities in the S-wave amplitudes corresponding to the σ, f0 and a0 resonances. The ππ → ππ,
phase shifts and inelasticities in the T = 0 scalar channel are well reproduced as well as the π0η and
mass distributions in the T = 1 channel. Furthermore, the total and partial strong decay widths of the f0 and a0 resonances are properly reproduced. The results seem to indicate that chiral symmetry constraints at low energy and unitarity in coupled channels is the basic information contained in the meson-meson interaction below
GeV. 相似文献
7.
The ν11 infrared band of gaseous benzene C6H6 is recorded at a resolution of 0.010 cm?1. The analysis yields a number of constants, primarily B0 = 0.1897543 ± 0.0000061 cm?1 (standard error). This number is in perfect agreement with a value determined from a recent analysis of the ν1 Raman band. 相似文献
8.
R. E. White W. Grü ebler V. K nig R. Risler A. Ruh P. A. Schmelzbach P. Marmier 《Nuclear Physics A》1972,180(2):593-599
The analysing powers iT11, T20, T21 and T22 for the elastic scattering of polarized deuterons by protons have been measured at deuteron energies of 6, 8, 10 and 11.5 MeV with the polarized deuteron beam from a tandem accelerator. The measurements cover the c.m. angular range from 40° to 155° and show small but non-zero analysing powers at all energies. 相似文献
9.
Keeyoon Sung Robert A. Toth Linda R. Brown Timothy J. Crawford 《Journal of Quantitative Spectroscopy & Radiative Transfer》2009,110(18):2082-2101
To support planetary studies of the Venus atmosphere, we measured line strengths of the 2v3, v1+2v2+v3, and 4v2+v3 bands of the primary isotopologue of carbonyl sulfide (16O12C32S), whose band centers are located at 4101.387, 3937.427, and 4141.212 cm−1, respectively. For this, infrared absorption spectra in normal carbonyl sulfide (OCS) sample gas were recorded at an unapodized resolution of 0.0033 cm−1 at ambient room temperatures using a Bruker Fourier transform spectrometer (FTS) at the Jet Propulsion Laboratory. The FTS instrumental line shape (ILS) function was investigated, which revealed no significant instrumental line broadening or distortions. Various custom-made short cells and a multi-pass White cell were employed to achieve optical densities sufficient to observe the strong 2v3 and the weaker bands in the region. Gas sample impurities and the isotopic abundances were determined from mass spectrum analysis. Line strengths were retrieved spectrum by spectrum using a non-linear curve fitting algorithm adopting a standard Voigt line profile, from which Herman–Wallis factors were derived for the three bands. The band strengths of 2v3, v1+2v2+v3, and 4v2+v3 of 16O12C32S (normalized at 100% of isotopologue) are observed to be 6.315(13)×10−19, 1.570(2)×10−20, and 7.949(20)×10−21 cm−1/molecule cm−2, respectively, at 296 K. These results are compared with earlier measurements and the HITRAN 2004 database. 相似文献
10.
The high-resolution infrared spectrum of HCF3 was studied in the ν6 fundamental (near 500 cm−1) and in the 2ν6 overtones (near 1000 cm−1) regions. The present study reports on the analysis of the hot bands in the ν6 region, as well as the first observation and assignment of the 2ν62 perpendicular band. Using ν6, 2ν6±2–ν6±1 and 2ν62 experimental wavenumbers, accurate coefficients C0 and DK0 of the K-dependent ground-state energy terms were obtained, using the so-called “loop method.” Ground-state energy differences Δ(K,J)=E0(K,J)−E0(K−3,J) were obtained for K=3–30. A least-squares fit of 81 such differences gave the following results (in cm−1): C0=0.1892550(15); DK0=2.779(26) × 10−7. 相似文献
11.
P. U. Sauer 《Annals of Physics》1973,80(2)
The 1S0 two-nucleon transition matrix T is constructed from the symmetric part σ of its half-shell elements. The on-shell component of σ is given by the phase shift, while a wide class of parametrizations is suggested for the off-shell part. Restrictions on the off-shell part of σ arising from the short range and the proper one-pion-exchange tail of the nucleon-nucleon interaction are investigated. Using σ in the 1S0 and the Reid soft-core potential in the other partial waves, the binding energy per particle in nuclear matter and 16O and the 18O shell-model spectrum are computed. The sensitivity of these nuclear-structure results is tested with respect to (i) smooth off-shell changes in σ, (ii) various assumptions on the high-energy phase shift, (iii) the charge dependence of the phase shift, and (iv) experimental uncertainties in the phase shift. 相似文献
12.
13.
S. V. Donskov A. K. Likhoded A. V. Luchinsky V. D. Samoilenko 《Physics of Atomic Nuclei》2009,72(12):2070-2075
The matrix element for the decay η′ → ηπ
0
π
0 is studied with allowance for the scalar mesons σ and α
0. Good agreement with experimental data is obtained. 相似文献
14.
We present experimental results of frequency modulation transfer spectroscopy in a vapor of neutral atomic calcium. The observed
line shapes agree well with the theoretical model. We use numerical calculations in order to improve the signal shape such
that its magnitude and its slope at the zero-crossing is maximized. When optimized this way, the frequency modulation transfer
signal can be used for the sensitive optical detection of rare species or isotopes, Doppler-free frequency measurements or
as a sensitive error signal for laser frequency stabilization.
PACS 42.62.Fi; 32.70.Jz; 39.30.+w 相似文献
15.
S. De Nicola 《Optics Communications》1991,80(5-6):299-302
In this paper we obtain an analytical expression for the intensity pattern associated with a field propagating from a circular aperture with a truncated J0 Bessel beam distribution. The diffraction integral in the scalar diffraction theory is evaluated in both the far field and the near field and numerical results are presented for the irradiance pattern on the beam axis as well as in the transverse plane. General curves are drawn to show clearly the truncation effects of the aperture on the propagation characteristics of J0 beams. 相似文献
16.
Ljiljana Puskar Evan G. Robertson Don McNaughton 《Journal of Molecular Spectroscopy》2006,240(2):244-250
We report a rovibrational analysis of the ν4 and ν6 fundamentals and the 2ν5 overtone of HNSO from high-resolution Fourier transform infrared spectra. The ν6 band (out-of-plane bend) centred at 757.5 cm−1 is c-type. The ν4 band (HNS bend) centred at 905.9 cm−1 is predominantly a-type with a very weak b-type component (). Numerous global perturbations and localized avoided crossings affecting the v4 = 1 rotational levels were successfully treated by inclusion of Fermi and c-axis Coriolis resonance terms between v4 = 1 and v5 = 2, and a b-axis Coriolis resonance term between v4 = 1 and v6 = 1. The latter term gives rise to an avoided crossing with an extraordinary ΔKa = 5 selection rule. The Fermi resonance between v4 = 1 and v5 = 2 gives rise to strong mixing of their rotational wavefunctions in the vicinity of Ka = 18. The resultant borrowing of intensity made it possible for 2ν5 transitions in the range Ka = 16–19 to be assigned and included in a global rovibrational treatment of all three band systems. 相似文献
17.
G. E. Malashkevich G. P. Shevchenko Yu. V. Bokshits A. A. Kornienko P. P. Pershukevich 《Optics and Spectroscopy》2005,98(2):190-194
A record peak luminescence intensity of the 5
D
0 → 7
F
4 transition in Eu3+ ions and broadening of their UV excitation band are obtained by doping of Eu-containing alumina gel films with bismuth oxyfluoride
and subsequent thermal treatment at T ≥ 700°C. The results obtained are explained by the formation of complex Eu—Bi centers with C
3V
symmetry in the Al2O3 structure, efficient migration of excitations from EuAlO3 crystallites to these centers, and the sensitization of the luminescence of the rare-earth activator by Bi3+ ions.
__________
Translated from Optika i Spektroskopiya, Vol. 98, No. 2, 2005, pp. 224–228.
Original Russian Text Copyright ? 2005 by Malashkevich, Shevchenko, Bokshits, Kornienko, Pershukevich. 相似文献
18.
Self-broadening coefficients of NH3 in the ν2 and ν4 bands and absolute line intensities in the ν2 band have been measured at room temperature for some selected lines in the P- and R-branches. Using a Fourier transform spectrometer, line intensities and collisional widths were obtained by fitting Voigt profiles to the measured shapes of the lines. The results of self-broadening coefficients are in reasonable agreement with calculated linewidths using a semiclassical model which reproduce rather well the systematic experimental J and K quantum numbers dependencies. Satisfactory agreement was also obtained for line intensities with previous measurements in the ν2 band. From the intensity measurements, we have determined effective transition dipole moments as well as Herman–Wallis parameters for the ν2 band. 相似文献
19.
Infrared fluorescence from CF2Cl2 molecules excited with a TEA CO2 laser below dissociation threshold, is time resolved with a HgCdTe detector without spectral resolution in the range 1100-700 cm-1. The signal fits well to a sum of three exponentials, which are interpreted as a bulk vibration-vibration (V-V) energy transfer between the fraction of highly excited and non-excited molecules in the irradiated volume, vibro-translation (V-T) deactivation and diffusional heat and mass transport to the surrounding. The measured V-V and V-T rates increase with vibrational excitation and the V-T deactivation is independent on the observed modes (v1/v6 or v8) if v8 or v1 are excited respectively. 相似文献
20.
Two-photon transitions between some perturbed states of a Ba atom have been experimentally investigated with different perturbing
and exciting radiations. A strong dependence of the probability of two-photon transitions between the perturbed states on
the mutual orientation of the electric vectors of the exciting and perturbing radiations has been found.
Original Russian Text ? I.I. Bondar’, V.V. Suran, 2007, published in Optika i Spektroskopiya, 2007, Vol. 102, No. 1, pp. 49–54. 相似文献