共查询到20条相似文献,搜索用时 15 毫秒
1.
R. Gheisari 《Molecular physics》2013,111(23-24):2927-2933
A variational approach is presented employing a new wave functionfor the dtμ J ,ν muonic molecule. The work is based on the calculation of the resonant formation rate in media including HD molecules. The results are compared with those reported previously at temperatures T ? 3 K and are found to be in good agreement. 相似文献
2.
The partial spectral distribution function
for muonic molecule formation turns out to play an important role in understanding the effect of interactions with surrounding spectator molecules. We formulate and numerically calculate it for a solid hydrogen. First of all, in addition to a conventional Lorentzian peak centered at a resonance energy
, there appears another very broad peak in the spectral distribution, which extends from the resonance energy to energies higher by the Debye energy
D of the solid. It is shown that the latter corresponds to the spectral distribution of phonon excitations caused by a sudden dt formation. Secondly, a strong intensity borrowing from the Lorentzian peak to the broad one occurs. Thanks to this fact, a large formation rate is yielded for subthreshold transitions. The comparison with Vesman's spectral distribution function, namely, of a dt formation for an isolated D2, is made. 相似文献
3.
《Physics letters. [Part B]》1987,196(3):272-276
Variational calculations of energy levels, of ϵJv and λ-factors of weakly bound rotational-vibrational states (J=1, v=1) of the mesic molecules ddμ and dtμ, which are of main interest for recent muon-catalysed fusion experiments are performed. A set of about 2000 basis functions has been used in calculations which has enabled us to obtain the following extrapolated values: ϵ11 (ddμ) = −1.9750 ± 0.0002 eV and ϵ11 (dtμ) = − 0.6604 ± 0.0002 eV. 相似文献
4.
Accurate non-Born-Oppenheimer variational calculations of all bound states of the positive muon molecular ion 4Heμ^+ have been performed using explicitly correlated Gaussian functions in conjunction with the global vectors.All the energies obtained are accurate in the order of 10-6 Hartree(1 Hartree=27.2114 eV).Compared with the binding energies obtained from calculations based on the Born-Oppenheimer potential with the mass-weighted adiabatic corrections(Chem.Phys.Lett.110487(1984)),the largest relative deviation is up to 15%.By analyzing the average interparticle distances and possibility distributions of interparticle distances of this system,it is confirmed that the Born-Oppenheimer approximation is reasonable for this system and that 4Heμ^+ can be regarded as a system of positive muon bound to a slightly distorted helium atom. 相似文献
5.
6.
V. I. Privalov V. V. Lapkin V. P. Tarasov Yu. A. Buslaev 《Applied magnetic resonance》1990,1(3):445-455
Two aqueous solutions of oxonitrocomplexes comprising di- and tetravalent platinum atoms, K5[(NO2)3PtIV(μ-O)3Pt 3 II (NO2)6]· 3H2O and K8[(NO2)6Pt 3 II (μ-O)3PtIV (μ-O)3Pt 3 II (NO2)6] · 7H2O, have been studied by195Pt and15N NMR technique. Both compounds, enriched with the15N (95%) isotope, were synthesized by thermal denitrozylation of K2[Pt(NO2)4]. Constants of spin-spin scalar coupling,195Pt-15N and195PtII-195PtIV, were obtained for tetra-and heptameric complexes in aqueous solutions through multiplet simulation. The195Pt and15N NMR spectra of the same solutions obtained two months after their preparation show signals from the hydrolytic forms of the tetrameric complex as well as the signals from mono- di- and trimeric oxonitrocomplex forms of divalent platinum. All signals of species formed as a result of hydrolysis were identified. 相似文献
7.
Rates of particle-emitting decay of the resonant state of the muonic molecular ion (dHe)
J=1 lying below the (d)1s-He threshold can decay to the d-He scattering state. The resonant state is estimated by scattering calculations with the non-adiabatic coupled-rearrangement-channel method. Strong isotope dependence of the decay rates of (d3He)
J=1 and (d4He)
J=1 is predicted, though the calculated radiative decay rates of the states are almost the same. In (d3He)
J=1, the particle decay width is three times larger than the radiative decay width, while the two types of decay widths are almost the same in (d4He)
J=1. This results in a strong hindrance of the branching ratio of the radiative decay of (d3He)
J=1 compared with the case of (d4He)
J=1. This is consistent with a recent observation of the radiative decay of the two molecular states. 相似文献
8.
This study examines six unimolecular reactions of CH2XCHFO (X?=?H,?F). The geometries of the reactions are optimized with Gaussian 03. The calculated barrier heights show that bond C–C′ scission, CH2XCHFO (X?=?H,?F)?→?CH2X?+?CHFO (R1), dominates the decomposition of CH2XCHFO. For X?=?H and X?=?F, the barrier heights of (R1) are 13.37 and 9.67?kcal?mol?1, respectively. The YL (Yao and Lin) method is used to calculate the anharmonic and harmonic rate constants of the unimolecular reactions. The results clearly demonstrate the anharmonic effect of these reactions. In the microcanonical case, for (R1) (X?=?H), the total energy is from 42.78 to 144.84?kcal?mol?1. The corresponding anharmonic rate constants are from 1.57?×?1012 to 2.52?×?1013?s?1 and the harmonic rate constants are from 1.52?×?1012 to 2.52?×?1013?s?1. 相似文献
9.
D. Gotta D. S. Covita D. F. Anagnostopoulos H. Fuhrmann H. Gorke A. Gruber A. Hirtl T. Ishiwatari P. Indelicato E. -O. Le Bigot M. Nekipelov V. Pomerantsev M. Popov J. M. F. dos Santos Ph. Schmid L. M. Simons M. Trassinelli J. F. C. A. Veloso J. Zmeskal 《Physics of Particles and Nuclei》2014,45(1):181-183
The (3p — 1s) X-ray transition to the muonic hydrogen ground state was measured with a highresolution crystal spectrometer. The assumption of a statistical population of the hyperfine levels of the muonic hydrogen ground state was directly confirmed by the experiment and measured values for the hyperfine splitting can be reported. The measurement supplements studies on line broadening effects induced by Coulomb de-excitation hindering the direct extraction of the pion-nucleon scattering lengths from pionic hydrogen and deuterium X-ray lines. 相似文献
10.
Aaltonen T González BA Amerio S Amidei D Anastassov A Annovi A Antos J Apollinari G Appel JA Apresyan A Arisawa T Artikov A Asaadi J Ashmanskas W Auerbach B Aurisano A Azfar F Badgett W Barbaro-Galtieri A Barnes VE Barnett BA Barria P Bartos P Bauce M Bauer G Bedeschi F Beecher D Behari S Bellettini G Bellinger J Benjamin D Beretvas A Bhatti A Binkley M Bisello D Bizjak I Bland KR Blocker C Blumenfeld B Bocci A Bodek A Bortoletto D Boudreau J Boveia A Brau B Brigliadori L Brisuda A Bromberg C 《Physical review letters》2011,106(16):161801
We reconstruct the rare decays B(+)→K(+)μ(+0μ(-0, B90)→K*(892)(0)μ(+)μ(-), and B(s)(0)→?(1020)μ(+)μ(-) in a data sample corresponding to 4.4 fb(-1) collected in pp collisions at √[s]=1.96 TeV by the CDF II detector at the Tevatron Collider. Using 121±16 B(+)→K(+)μ(+)μ(-) and 101±12 B(0)→K(*0)μ(+)μ(-) decays we report the branching ratios. In addition, we report the differential branching ratio and the muon forward-backward asymmetry in the B(+) and B(0) decay modes, and the K(*0) longitudinal polarization fraction in the B(0) decay mode with respect to the squared dimuon mass. These are consistent with the predictions, and most recent determinations from other experiments and of comparable accuracy. We also report the first observation of the B(s)(0)→?μ(+)μ(-) decay and measure its branching ratio BR(B(s)(0)→?μ(+)μ(-))=[1.44±0.33±0.46]×10(-6) using 27±6 signal events. This is currently the most rare B(s)(0) decay observed. 相似文献
11.
《Physics letters. [Part B]》1986,174(2):133-136
Muonic X-ray spectra of μ3He and μ4He from dμd, pμd, and dμt fusion are analyzed for various target densities. Theoretical values of the intensity ratio μ3He(3→1)/μ3He(2→1) for dμd and pμd fusion at liquid hydrogen density are, respectively, 0.132 and 0.0553. These are in good agreement with the experimental results. 相似文献
12.
WU Lu-Sen XIAO Zhen-Jun 《理论物理通讯》2007,48(3):502-508
In this paper, we present the exact calculations for the vertex ^-sγb and ^sZb in the unitary gauge. We find that (a) the divergent- and μ-dependent terms are left in the effective vertex function Г^γμ(p, k) for b → sγ transition even after we sum up the contributions from four related Feynman diagrams; (b) for an on-shell photon, such terms do not contribute et al.; (c) for off-shell photon, these terms will be canceled when the contributions from both vertex ^sγb and ^sZb are taken into account simultaneously, and therefore the finite and gauge-independent function Zo(xt) = Co(xt) + Do(xt)/4, which governs the semi-leptonic decay b → sl^- l^+, is derived in the unitary gauge. 相似文献
13.
Wieslaw Pusz 《Letters in Mathematical Physics》1991,21(1):59-67
The natural S U(2) action on the creation and annihilation operators satisfying twisted canonical commutation relations (TCCR) is investigated. It is shown that the Fock representation is the only covariant irreducible representation of TCCR.Partially supported by the program RP.1.10. 相似文献
14.
Zhishuai Ge Gen Zhang Shihui Cheng Yu. S. Tsyganov Feng-Shou Zhang 《中国物理C(英文版)》2020,44(10):104102-104102-17
The \begin{document}$\alpha$\end{document} ![]()
![]()
-decay properties of even-Z nuclei with Z = 120, 122, 124, 126 are predicted. We employ the generalized liquid drop model (GLDM), Royer's formula, and universal decay law (UDL) to calculate the \begin{document}$\alpha$\end{document} ![]()
![]()
-decay half-lives. By comparing the theoretical calculations with the experimental data of known nuclei from Fl to Og, we confirm that all the employed methods can reproduce the \begin{document}$\alpha$\end{document} ![]()
![]()
-decay half-lives well. The preformation factor \begin{document}$P_{\alpha}$\end{document} ![]()
![]()
and \begin{document}$\alpha$\end{document} ![]()
![]()
-decay energy \begin{document}$Q_{\alpha}$\end{document} ![]()
![]()
show that \begin{document}$^{298,304,314,316,324,326,338,348}$\end{document} ![]()
![]()
120, \begin{document}$^{304,306,318,324,328,338}$\end{document} ![]()
![]()
122, and \begin{document}$^{328,332,340,344}$\end{document} ![]()
![]()
124 might be stable. The \begin{document}$\alpha$\end{document} ![]()
![]()
-decay half-lives show a peak at Z = 120, N = 184, and the peak vanishes when Z = 122, 124, 126. Based on detailed analysis of the competition between \begin{document}$\alpha$\end{document} ![]()
![]()
-decay and spontaneous fission, we predict that nuclei nearby N = 184 undergo \begin{document}$\alpha$\end{document} ![]()
![]()
-decay. The decay modes of \begin{document}$^{287-339}$\end{document} ![]()
![]()
120, \begin{document}$^{294-339}$\end{document} ![]()
![]()
122, \begin{document}$^{300-339}$\end{document} ![]()
![]()
124, and \begin{document}$^{306-339}$\end{document} ![]()
![]()
126 are also presented. 相似文献
15.
《Surface science》1988,199(3):L413-L418
We have measured the energy of the σ shape resonance for a saturated (2 L) coverage of CO on Ni(001) by observation of both the carbon 1s direct emission and the carbon Auger emission. Both measurements were performed on the same sample at the same time with a carefully calibrated monochromator. Although a previous angle-resolved study of the carbon 1s direct emission set the σ resonance at 311 eV, it is clearly seen in both of our measurements near hv = 303 eV, in agreement with previous results using Auger emission. Since shape resonances may be used to determine bond lengths, resolution of this issue has important implications. 相似文献
16.
17.
18.
The α decay half-life of the unknown nucleus ~(297)Og is predicted within the two-potential approach, andα preformation probabilities of 64 odd-A nuclei in the region of proton numbers 82 Z 126 and neutron numbers 152 N 184, from ~(251)Cf to ~(295)Og, are extracted. In addition, based on the latest experimental data, a new set of parameters for α preformation probabilities considering the shell effect and proton-neutron interaction are obtained.The predicted α decay half-life of ~(297)Og is 0.16 ms within a factor of 4.97. The predicted spin and parity of the ground states for ~(269)Sg,~(285)Fl and ~(293)Lv are 3/2~+, 3/2~+ and 5/2~+, respectively. 相似文献
19.
A new beam propagation method (BPM) is developed based on a direct approximation to the propagator by its [(p-1)/p] Padé approximant. The approximant is simple to construct and has the desired damping effect for the evanescent modes. The method is applied to a tapered waveguide for TM-polarized waves, based on the energy-conserving improvement of the one-way Helmholtz equation. Numerical results are compared with those obtained with other variants of the BPM. 相似文献