共查询到20条相似文献,搜索用时 15 毫秒
1.
Estimation of radiative capture 13B(n,γ0+1)14B reaction rate in the modified potential cluster model
We discuss current attempts to employ the modified potential cluster model to describe the available experimental data on the 13B(n,γ0+1)14B total cross-sections.The estimated results of the M1 and E1 transitions from the n13B scattering states to the ground and first excited states of 14B are presented.The 1st resonance at Ex=1.275MeV(1+) is revealed in both the cross-section and reaction rate.Within the var... 相似文献
2.
Franck--Condon factors and r-Centroids for the A 1∑+u-X1∑+g Band System of 107,109Ag2: Comparison of the Observed and Calculated Absorption Band Strengths
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A.Antic-Jovanovic M.Kuzmanovic V.Bojovic Murtadha A.Khakoo Russ R.Laher 《中国物理快报》2007,24(9):2566-2568
Franck-Condon factors and r-centrolds for the, A^1 ∑^+ u-X^1∑^+ 9 band system of ^107,109Ag2 are computed using Morse and Rydberg-Klein-Rees potentials for both lower and upper electronic states. The differences between the two sets of results are typically in the third decimal place for transitions involving vibrational levels with ν' and ν" up to about 15. Somewhat larger deviations appear for higher vibrational levels, but both sets of results follow the same pattern, which is to match well with the relative absorption band strength distribution in our experimental spectrum. The relative absorption band strengths are calculated by assuming that the electronic transition moment has only a weak dependence on the internuclear distance r. Good agreement between our measured and calculated absorption band strength ratios is found, which provides an excellent test of the calculated Franck- Condon factors and relative absorption band strengths. The r-centrold value for the (ν' = 0, ν" = 0) band is found to be approximately equal to the average value of r' and r''e , indicating that the potentials of both states are not significantly aaharmonic around their minimum regions. 相似文献
3.
The atom-atom-anion three-body recombination(TBR) and collision induced dissociation(CID) processes of the 3He–3He–T- system at ultracold temperatures are investigated by solving the Schr¨odinger equation in the adiabatic hyperspherical representation. The variations of the TBR and CID rates with the collision energies in the ultracold temperatures are obtained. It is found that the JΠ= 1- symmetry dominates the TBR and CID processes in most... 相似文献
4.
The internal structure of the charm-strange mesons Ds0*(2317) and Ds1(2460) are the subject of intensive studies.Their widths are small because they decay dominantly through isospinbreaking hadronic channels Ds0*(2317)+→Ds+π0 and Ds1(2460)+→Ds*+π0.The Ds1(2460) can also decay into the hadronic final states Ds+ππ... 相似文献
5.
We construct both the scalar-diquark-scalar-diquark-antiquark type and axialvector-diquark-axialvector-diquark-antiquark type interpolating currents to study the charmed pentaquark:states suscu with Jp=1/2±.We employ the QCD sum rules to investigate the masses and pole residues of the charmed pentaquark states by taking into account the vacuum condensates up to dimension 13 in the operator product expansion.Our calculation results indicate that the scalar-diquark-scalar-diquark-antiquark type and axialvector-diquark-axialvector-diquark-antiquark type charmed pentaquark states suscu with Jp=1/2- can be possible candidates of the excited states observed in the LHCb collaboration. 相似文献
6.
The discovery of Ξcc++has inspired new interest in studying doubly heavy baryons.In this study,the weak decays of a doubly charmed baryon Bccto a light baryon B and a charm meson D*(either a pseudoscalar or a vector one)are calculated.Following our previous work,we calculate the short distance contributions under the factorization hypothesis,whereas the long distance contributions are modeled as the final state interactions,which are calculated with the one particle exchange model.We find that the Bcc→BD*decays'branching ratios are obviously larger,as they receive contributions of more polarization states.Among the decays that we investigate,the following have the largest branching fractions:BR(Ξcc++→∑+D*+)∈[0.46%,3.33%]estimated with τΞcc++=256 fs;BR(Ξcc+→AD*+)∈[0.38%,2.63%]and BR(Ξcc+→∑0D*+)∈[0.45%,3.16%]with τΞcc++=45 fs;and BR(Ωcc+→Ξ0D+)∈[0.27%,1.03%),BR(Ωcc+→∑0D*+)∈[0.07%,0.44%],and BR(Ωcc+→∑0D*+)∈[0.06%,0.45%] with τ_(Ωcc)+=75 fs.By comparing the decay widths of pure color commensurate channels with those of pure bow-tie ones we find that the bow-tie mechanism plays an important role in charm decays. 相似文献
7.
We present the novel V→K+K-(V=φ,ρ,ω) resonance,which generates a strong phase associated with vector meson resonances,leading to significant CP asymmetry in the interference region.The φ→K+K-,ρ→K+K-,and ω→K+K-resonances arise from the mixing of the vector mesons φ,ρ,and ω.We calculate the CP asymmetry from the decay mode of B→ KKπ(K).Meanwhile,the localized CP asymmetries are presented and a detailed analysis... 相似文献
8.
Ula? ?zdem 《中国物理C(英文版)》2024,(1):11-20
The magnetic and quadrupole moments of the Zc(4020)+,Zc(4050)+,and Zc(4600)+ states are calculated within the QCD light-cone sum rules.The compact diquark-antidiquark interpolating currents and the distribution amplitudes of the on-shell photon are used to extract the magnetic and quadrupole moments of these states.The magnetic moments are acquired as μZc=0.50-0.22+0.22μN,μ 相似文献
9.
The Auger decay for the many-electron Xe+(4p3?1/2)state is studied in detail,using multistep approaches.It is found that the single Auger decay channels are primarily Coster–Kronig processes,which is in accord with other theoretical and experimental results.The double and triple Auger decays result primarily from cascade processes,i.e.,the sequential two-step and three-step Auger decay,and as such,the contributions from direct processes can be neglected.Level-to-level rates for single,double,and triple decays are obtained,based on which comprehensive Auger electron spectra and ion yields are obtained.Our decay paths and Auger electron spectra are in agreement with the experimental analysis[Hikosaka et al.,Phys.Rev.A 76(2007)032708],and our ion yield ratios(Xe2+:Xe3+:Xe4+=4.6:87.0:8.4)are also in line with their values(5.0:86.0:9.0).However,with respect to the ion yield ratios,a discrepancy still remains among the experimental and theoretical results.Taking into account the complexity of Xe’s electronic structure,further,more detailed experiments are still required. 相似文献
10.
OPTICAL-OPTICAL DOUBLE-RESONANCE EXCITATION SPECTRA OF THE (6d)1Πg, (7d)1Πg HIGH-LYING RYDBERG STATES IN Na2
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Two 1Πg states of Na2 for v≤13 have been observed by using optical-optical double resonance (OODR) fluorescence excitation spectroscopy. The intermediate levels in B1Πu state are identified by the numerical calculations with the molec-ular constants for B1Πu←X1Σg+ transitions and confirmed by the complemen-tary A1Σg+←X1Σg+ polarization spectra. Absolute vibrational numberings of the (6d)1Πg and (7d)1Πg states are determined by comparing the experimental OODR excitation intensities with the simulated Franck-Condon factors. The Dnnham coef-ficients and the Rydberg-Klein-Rees (RKR) potential energy curves of the (6d)1Πg, (7d)1Πg states are reported. 相似文献
11.
The multi-particle states and rotational properties of the two-particle bands in 254No are investigated by the cranked shell model with pairing correlations treated by the particle number conserving method.The rotational bands on top of the two-particle K^π=3^+,8^− and 10^+ states and the pairing reduction are studied theoretically in 254No for the first time.The experimental excitation energies and moments of inertia of the multi-particle states are reproduced well by the calculations.Better agreement with the data is achieved by including the high-order deformation ε6,which leads to enlarged Z=100 and N=152 deformed shell gaps.An increase of J1 in these two-particle bands compared with the ground state band is attributed to the pairing reduction due to the Pauli blocking effect. 相似文献
12.
Using a full configuration-interaction method with Hylleraas-Gaussian basis function, this paper investigates the 110+, 11(–1)+ and 11(–2)+ states of the hydrogen negative ion in strong magnetic fields. The total energies, electron detachment energies and derivatives of the total energy with respect to the magnetic field are presented as functions of magnetic field over a wide range of field strengths. Compared with the available theoretical data, the accuracy for the energies is enhanced significantly. The field regimes 3 < γ < 4 and 0.02 < γ < 0.05, in which the 11(–1)+ and 11(–2)+ states start to become bound, respectively, are also determined based on the calculated electron detachment energies. 相似文献
13.
In the framework of the improved chromomagnetic interaction model, we complete a systematic study of the S-wave tetraquark states ■ ( Q = c, b, and q = u, d, s) with different quantum numbers: JPC= 0(+(+)), 1(+(±)),and 2(+(+)). The mass spectra of tetraquark states are predicted, and the possible decay channels are analyzed by considering both the angular momentum and C-parity conservation. The recently observed hidden-charm tetraquark states with stra... 相似文献
14.
We report on the efficient creation of a sample of 2.2×104 fermionic polar molecules 23Na40K in their rovibrational ground state X1∑+|v=0,J=0>at 247 nK via an intermediate state of the spin-orbit coupled complex B1Π|v=4〉~C3∑+|v=25〉.Compared with the intermediate state of the coupled complex B1Π|v=12〉~c3∑+|v=35〉,this intermediate state has the larger Franck-Condon factors fo... 相似文献
15.
The opacities of the lithium hydride molecule are calculated for temperatures of 300 K,1000 K,1500 K,and 2000 K,at a pressure of 10 atm,in which the contributions from the five low-lying electronic states are considered.The ab initio multi-reference single and double excitation configuration interaction(MRDCI) method is applied to compute the potential energy curves(PECs) of the 7 LiH,including four 1∑+ states and one 1Π state,as well as the correspond... 相似文献
16.
We investigate the exotic ΩΩ dibaryon states with JP=0+and 2+in a molecular picture.We construct a tensorΩΩmolecular interpolating current and calculate the two-point correlation function within the method of QCD sum rules.Our calculations indicate that the masses of the scalar and tensor dibaryon states are mΩΩ,0+=(3.33±0.51)GeV and mΩΩ,2+=(3.15±0.33)GieV,respectively,which are below the 2mΩthreshold.Within error,these results do not negate the existence of loosely bound molecularΩΩdibaryon states.These exotic strangeness S=-6 and doubly-chargedΩΩdibaryons,if they exist,may be identified in heavy-ion collision processes in the fu-ture. 相似文献
17.
Time-dependent theoretical approach to the influence of laser fields on the resonance enhanced multi-photon ionization of SH radical
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This paper reports that the (2+1) resonance enhanced multi-photon
ionization spectra of SH radical in external fields are simulated
using the split-operator scheme of time-dependent wave-packet
method. Two ionic states, i.e.~a1Δ and b1∑+, are
involved in the simulation. It gives the simulated photoelectron
spectra, the population in each electronic state, as well as the
projection of the wave-packet in each electronic state on different
vibrational states. These results show that the so-called four-state
model can represent the experimental results well. 相似文献
18.
Reconciliation of Theoretical Lifetimes of the 5s5p3P2o Metastable State for 88Sr with Measurement: The Role of the Blackbody-Radiation-Induced Decay
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We conducted measurement and calculation to resolve the long-standing large discrepancy in the metastable state lifetime for the 88Sr atom between theoretical and experimental results. The present lifetime τ = 830-240+600s,measured using the magneto-optical trap as a photon amplifier to detect the weak decay events, is approximately60% larger than the previous experimental value τ = 520-140+310s. By considering the electron correlation effec... 相似文献
19.
Using an extended chromomagnetic model,we perform a systematic study of the masses of doubly heavy tetraquarks.We find that the ground states of the doubly heavy tetraquarks are dominated by the color-triplet ■configuration,which is opposite to that of fully heavy tetraquarks.The combined results suggest that the color-triplet configuration becomes more important when the mass difference between the quarks and antiquarks increases.We find three stable states that lie below the thresholds of two pseudoscalar mesons.They are the IP=01+nnbb tetraquark,IP=1+nncb tetraquark,and JP=1+nsbb tetraquark. 相似文献
20.
ASYMMETRY PARAMETERS AND DIFFERENTIAL CROSS SECTIONS FOR PHOTOIONIZATION-EXCITATION OF HELIUM
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Asymmetry parameter β2 for photoionization of helium leaving the He+ ion in the n=2 level and differential cross sections(DCSs) in the n=2,3,4 levels with photon emission angle θ=900 are provided at photon energies 69-76.8 eV employing the R-matrix method with a 20-term target representation, in which five polarization orbitals \bar{6}l are included. The asymmetry parameter β2 and the DCS, in the n=2 level in the region of 69-73 eV, are in good agreement with available experimental and theoretical results. Above the n=3 threshold, we present new theoretical results along with measurements. No theoretical and experimental results can be used to compare with the present calculations of the DCSs for photoionization into the He+ ion in the n=3,4 levels. 相似文献