scholarly journals Higher-order multipole amplitudes in charmonium radiative transitions

2009 ◽  
Vol 80 (11) ◽  
Author(s):  
M. Artuso ◽  
S. Blusk ◽  
S. Khalil ◽  
R. Mountain ◽  
K. Randrianarivony ◽  
...  
Keyword(s):  
Higher Order ◽  
Radiative Transitions ◽  
Multipole Amplitudes

scholarly journals Measurement of higher-order multipole amplitudes in ψ(3686)→γχc1,2 with χc1,2→γJ/ψ and search for the transition ηc(2S)→γJ/ψ

2017 ◽  
Vol 95 (7) ◽  
Author(s):  
M. Ablikim ◽  
M. N. Achasov ◽  
X. C. Ai ◽  
O. Albayrak ◽  
M. Albrecht ◽  
...  
Keyword(s):  
Higher Order ◽  
Multipole Amplitudes

scholarly journals Charmonium Decays at BESIII

2018 ◽  
Vol 46 ◽  
pp. 1860025 ◽  
Author(s):  
Jielei Zhang
Keyword(s):  
Branching Fractions ◽  
Higher Order ◽  
Radiative Decays ◽  
Angular Distributions ◽  
Data Sets ◽  
Electron Positron ◽  
The World ◽  
First Time ◽  
Multipole Amplitudes

The BESIII Experiment at the Beijing Electron Positron Collider (BEPCII) has accumulated the largest [Formula: see text] collisions data sets in the [Formula: see text]-charm region in the world. Using the data sets of 448.1 million [Formula: see text] events and 1.3 billion [Formula: see text] events, the branching fractions and the angular distributions of [Formula: see text] and [Formula: see text] decay to [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] are measured. The branching fractions of [Formula: see text] are reported with improved precision. The higher-order multipole amplitudes in [Formula: see text] with [Formula: see text] are measured, as a byproduct the [Formula: see text] transition is searched. The Dalitz decays of [Formula: see text] and [Formula: see text] are observed and the branching fractions are measured. [Formula: see text] radiative decays [Formula: see text] are observed for the first time. Improved measurement of [Formula: see text] and search for [Formula: see text] are reported.

scholarly journals Statistical multipole formulations for shielding problems

2012 ◽  
Vol 10 ◽  
pp. 233-238 ◽  
Author(s):  
K. Körber ◽  
L. Klinkenbusch
Keyword(s):  
Electromagnetic Field ◽  
Three Dimensional ◽  
Higher Order ◽  
Statistical Moments ◽  
Accurate Computation ◽  
Statistical Variations ◽  
Multipole Amplitudes

Abstract. A multipole-based method is presented for modelling an electromagnetic field with small statistical variations inside an arbitrary enclosure. The accurate computation of the statistics of the field components from the statistical moments of the multipole amplitudes is demonstrated for two- and three-dimensional examples. To obtain the statistics of quantities which depend non-linearly on the field components, higher-order statistical moments of the latter are required.

Dual systems for all: Higher-order, role-based relational reasoning as a uniquely derived feature of human cognition

2019 ◽  
Vol 42 ◽  
Author(s):  
Daniel J. Povinelli ◽  
Gabrielle C. Glorioso ◽  
Shannon L. Kuznar ◽  
Mateja Pavlic
Keyword(s):  
Temporal Reasoning ◽  
Higher Order ◽  
Important Case ◽  
Human Cognition ◽  
Relational Reasoning ◽  
Dual Systems ◽  
First Order ◽  
Reasoning System ◽  
Role Based

Abstract Hoerl and McCormack demonstrate that although animals possess a sophisticated temporal updating system, there is no evidence that they also possess a temporal reasoning system. This important case study is directly related to the broader claim that although animals are manifestly capable of first-order (perceptually-based) relational reasoning, they lack the capacity for higher-order, role-based relational reasoning. We argue this distinction applies to all domains of cognition.

Recent Radiative and Collisional Atomic Data of Astrophysical Interest

1988 ◽  
Vol 102 ◽  
pp. 129-132
Author(s):  
K.L. Baluja ◽  
K. Butler ◽  
J. Le Bourlot ◽  
C.J. Zeippen
Keyword(s):  
Mass Production ◽  
Bound States ◽  
Physical Models ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Atomic Data ◽  
Isoelectronic Sequence ◽  
Astrophysical Interest ◽  
Radiative Transitions ◽  
Forbidden Transitions

SummaryUsing sophisticated computer programs and elaborate physical models, accurate radiative and collisional atomic data of astrophysical interest have been or are being calculated. The cases treated include radiative transitions between bound states in the 2p4and 2s2p5configurations of many ions in the oxygen isoelectronic sequence, the photoionisation of the ground state of neutral iron, the electron impact excitation of the fine-structure forbidden transitions within the 3p3ground configuration of CℓIII, Ar IV and K V, and the mass-production of radiative data for ions in the oxygen and fluorine isoelectronic sequences, as part of the international Opacity Project.

Quantitative EPMA of nitrogen : A tricky element in the electron-probe microanalyzer

1992 ◽  
Vol 50 (2) ◽  
pp. 1622-1623
Author(s):  
G.F. Bastin ◽  
H.J.M. Heijligers
Keyword(s):  
Background Subtraction ◽  
Electron Probe ◽  
Detection System ◽  
Higher Order ◽  
Light Elements ◽  
Strong Suppression ◽  
Electron Probe Microanalyzer ◽  
Quantitative Epma ◽  
Peak Count ◽  
Lead Stearate

Among the ultra-light elements B, C, N, and O nitrogen is the most difficult element to deal with in the electron probe microanalyzer. This is mainly caused by the severe absorption that N-Kα radiation suffers in carbon which is abundantly present in the detection system (lead-stearate crystal, carbonaceous counter window). As a result the peak-to-background ratios for N-Kα measured with a conventional lead-stearate crystal can attain values well below unity in many binary nitrides . An additional complication can be caused by the presence of interfering higher-order reflections from the metal partner in the nitride specimen; notorious examples are elements such as Zr and Nb. In nitrides containing these elements is is virtually impossible to carry out an accurate background subtraction which becomes increasingly important with lower and lower peak-to-background ratios. The use of a synthetic multilayer crystal such as W/Si (2d-spacing 59.8 Å) can bring significant improvements in terms of both higher peak count rates as well as a strong suppression of higher-order reflections.

Effects of Higher-Order Laue Zone reflections on structure images

1993 ◽  
Vol 51 ◽  
pp. 450-451
Author(s):  
H. S. Kim ◽  
S. S. Sheinin
Keyword(s):  
Wave Vector ◽  
Theoretical Calculations ◽  
Reciprocal Lattice ◽  
Image Plane ◽  
Bloch Wave ◽  
Dynamical Theory ◽  
Higher Order ◽  
Lattice Image ◽  
Lattice Vector ◽  
Image Position

The importance of image simulation in interpreting experimental lattice images is well established. Normally, in carrying out the required theoretical calculations, only zero order Laue zone reflections are taken into account. In this paper we assess the conditions for which this procedure is valid and indicate circumstances in which higher order Laue zone reflections may be important. Our work is based on an analysis of the requirements for obtaining structure images i.e. images directly related to the projected potential. In the considerations to follow, the Bloch wave formulation of the dynamical theory has been used.The intensity in a lattice image can be obtained from the total wave function at the image plane is given by: where ϕg(z) is the diffracted beam amplitide given by In these equations,the z direction is perpendicular to the entrance surface, g is a reciprocal lattice vector, the Cg(i) are Fourier coefficients in the expression for a Bloch wave, b(i), X(i) is the Bloch wave excitation coefficient, ϒ(i)=k(i)-K, k(i) is a Bloch wave vector, K is the electron wave vector after correction for the mean inner potential of the crystal, T(q) and D(q) are the transfer function and damping function respectively, q is a scattering vector and the summation is over i=l,N where N is the number of beams taken into account.

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