Formation of Excited States in a Helium Target by the Impact of 0.15- to 1.0-MeV Protons and Deuterons. I. Experimental

1967 ◽  
Vol 164 (1) ◽  
pp. 143-150 ◽  
Author(s):  
E. W. Thomas ◽  
G. D. Bent
Keyword(s):  
Excited States ◽  
The Impact ◽  
Mev Protons ◽  
Helium Target

scholarly journals Phase Analysis on the Error Scaling of Entangled Qubits in a 53-Qubit System

2021 ◽  
Author(s):  
Ching-Ray Chang ◽  
Wei-Jia Huang ◽  
Wei-Chen Chien ◽  
Chien-Hung Cho ◽  
Che-Chun Huang ◽  
...  
Keyword(s):  
Excited States ◽  
Phase Trajectory ◽  
Trajectory Analysis ◽  
Operation Time ◽  
Noisy Environment ◽  
Gate Operation ◽  
Intermediate Scale ◽  
Entanglement Evolution ◽  
Qubit System ◽  
The Impact

Abstract We have studied carefully the behaviors of entangled qubits on the IBM Rochester with various connectivities and under a “noisy” environment. A phase trajectory analysis based on our measurements of the GHZ-like states is performed. Our results point to an important fact that entangled qubits are “protected” against environmental noise by a scaling property that impacts only the weighting of their amplitudes. The reproducibility of most measurements has been confirmed within a reasonably short gate operation time. But there still are a few combinations of qubits that show significant entanglement evolution in the form of transitions between quantum states. The phase trajectory of an entangled evolution, and the impact of the sudden death of GHZ-like states and the revival of newly excited states are analyzed in details. All observed trajectories of entangled qubits arise under the influences of the newly excited states in a “noisy” intermediate-scale quantum (NISQ) computer.

scholarly journals Towards high-precision parton distributions from lattice QCD via distillation

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Colin Egerer ◽  
Robert G. Edwards ◽  
Christos Kallidonis ◽  
Kostas Orginos ◽  
Anatoly V. Radyushkin ◽  
...  
Keyword(s):  
Excited States ◽  
Wilson Line ◽  
Line Length ◽  
Dglap Evolution ◽  
Higher Twist Effects ◽  
Local Operators ◽  
Non Local ◽  
And Control ◽  
The Impact

Abstract We apply the Distillation spatial smearing program to the extraction of the unpolarized isovector valence PDF of the nucleon. The improved volume sampling and control of excited-states afforded by distillation leads to a dramatically improved determination of the requisite Ioffe-time Pseudo-distribution (pITD). The impact of higher-twist effects is subsequently explored by extending the Wilson line length present in our non-local operators to one half the spatial extent of the lattice ensemble considered. The valence PDF is extracted by analyzing both the matched Ioffe-time Distribution (ITD), as well as a direct matching of the pITD to the PDF. Through development of a novel prescription to obtain the PDF from the pITD, we establish a concerning deviation of the pITD from the expected DGLAP evolution of the pseudo-PDF. The presence of DGLAP evolution is observed once more following introduction of a discretization term into the PDF extractions. Observance and correction of this discrepancy further highlights the utility of distillation in such structure studies.

APPLICATIONS OF DISCRETE SINGULAR CONVOLUTION ALGORITHM IN ONE-ELECTRON SYSTEMS: HYDROGEN ATOM

2009 ◽  
Vol 08 (05) ◽  
pp. 813-826 ◽  
Author(s):  
KAIGE HU ◽  
LONG YU ◽  
RUIQIN ZHANG
Keyword(s):  
Hydrogen Atom ◽  
Boundary Conditions ◽  
Excited States ◽  
Density Functional ◽  
Numerical Solutions ◽  
Electron Systems ◽  
Hartree Fock ◽  
Convolution Algorithm ◽  
Discrete Singular Convolution ◽  
The Impact

The application of discrete singular convolution (DSC) algorithm in solving the Schrödinger equation of one-electron systems was attempted with a hydrogen atom as an example. Using the uniform discretization and Shannon kernel, the Schrödinger equations were solved in spherical coordinates. Compared with other methods such as discrete variable representation, Hartree–Fock, and density functional theory, the DSC algorithm is robust and efficient in numerical solutions for achieving accurate eigenvalues of excited states, and thus, especially suitable for problems in which lots of accurate eigenvalues of excited states are requested. The restrictions of boundary conditions on the discretization and the impact of singularities are studied. Both the boundary conditions and singularities were found to be critical in the numerical applications.

Scattering of 100-MeV protons by 11B and 16O

1970 ◽  
Vol 48 (6) ◽  
pp. 765-774 ◽  
Author(s):  
A. J. Houdayer ◽  
T. Y. Li ◽  
S. K. Mark
Keyword(s):  
Excited State ◽  
Elastic Scattering ◽  
Inelastic Scattering ◽  
Excited States ◽  
Optical Potential ◽  
Optical Model ◽  
Experimental Results ◽  
Optical Model Analysis ◽  
Potential Parameters ◽  
Mev Protons

The scattering of 100-MeV protons from 11B and 16O has been studied. An optical-model analysis of the elastic scattering on these nuclei has been performed and a consistent set of optical potential parameters which gave a good fit to the experimental results was obtained. In the inelastic scattering on 11B, it has been found that the first and third excited states were weakly excited whereas the second excited state was fairly strongly excited. The results were explained in terms of the unified model.

scholarly journals Self-interactions can stabilize excited boson stars

2022 ◽  
Author(s):  
Nicolas Sanchis-Gual ◽  
Carlos A R Herdeiro ◽  
Eugen Radu
Keyword(s):  
Initial Data ◽  
Excited States ◽  
Boson Stars ◽  
Star Models ◽  
Healing Power ◽  
Klein Gordon ◽  
Cooling Mechanism ◽  
The Stability ◽  
Dynamical Instabilities ◽  
The Impact

Abstract We study the time evolution of spherical, excited (i.e. nodeful) boson star models. We consider a model including quartic self-interactions, controlled by a coupling Λ. Performing non-linear simulations of the Einstein-(complex)-Klein-Gordon system, using as initial data equilibrium boson stars solutions of that system, we assess the impact of Λ in the stability properties of the boson stars. In the absence of self-interactions (Λ = 0), we observe the known behaviour that the excited stars in the (candidate) stable branch decay to a non-excited star without a node; however, we show that for large enough values of the self-interactions coupling, these excited stars do not decay (up to timescales of about t ∼104). The stabilization of the excited states for large enough self-interactions is further supported by evidence that the nodeful states dynamically form through the gravitational cooling mechanism, starting from dilute initial data. Our results support the healing power (against dynamical instabilities) of self-interactions, recently unveiled in the context of the non-axisymmetric instabilities of spinning boson stars.

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