Boson-Expansion Method and the Collective Negative-Parity States in Even-Even Spherical Nuclei

1973 ◽  
Vol 8 (4) ◽  
pp. 1525-1538 ◽  
Author(s):  
A. A. Rådutå ◽  
V. Ceausescu ◽  
G. Stratan ◽  
A. Såndulescu
Keyword(s):  
Expansion Method ◽  
Negative Parity ◽  
Boson Expansion ◽  
Spherical Nuclei

Application of the boson-expansion method to even Se and Ru isotopes

1975 ◽  
Vol 12 (3) ◽  
pp. 1035-1053 ◽  
Author(s):  
S. G. Lie ◽  
G. Holzwarth
Keyword(s):  
Expansion Method ◽  
Boson Expansion

Application of the Dyson boson expansion method to the treatment of the pairing force

2001 ◽  
Vol 11 (3) ◽  
pp. 263-270 ◽  
Author(s):  
O. Civitarese ◽  
F. Montani ◽  
M. Reboiro
Keyword(s):  
Expansion Method ◽  
Pairing Force ◽  
Boson Expansion

Triaxiality in 146,148Sm nuclei

1989 ◽  
Vol 67 (2-3) ◽  
pp. 131-134 ◽  
Author(s):  
A. K. Varshney ◽  
K. K. Gupta ◽  
D. K. Gupta ◽  
R. K. Tyagi
Keyword(s):  
Energy Levels ◽  
Branching Ratios ◽  
Energy Ratio ◽  
Poor Agreement ◽  
Model Framework ◽  
Expansion Technique ◽  
Asymmetric Rotor ◽  
Boson Expansion ◽  
Spherical Nuclei ◽  
Rotor Model

Recently, attempts have been made to use the dynamic pairing plus quadrupole model to evaluate B(E2) values, B(E2) branching ratios, and low-lying energy levels for 146,148Sm nuclei, which are in poor agreement with experiment. Application of the boson expansion technique on 148Sm shows too much splitting and an incorrect order for the quintet states, while other properties have not been discussed. In the present work, 146,148Sm nuclei have been described using an asymmetric rotor model framework. The nonaxiality parameter (γ) has been evaluated using the energy ratio E2+′/E6+. Remarkable success has been achieved in explaining the correct ordering of known low-lying energy levels, B(E2) values, and B(E2) branching ratios, which indicate that the so-called spherical nuclei may be treated as triaxial.

scholarly journals On a Boson Expansion Method with Two-Body Correlations

1992 ◽  
Vol 88 (1) ◽  
pp. 35-52
Author(s):  
T. Kishimoto ◽  
T. Kammuri ◽  
H. Sakamoto
Keyword(s):  
Expansion Method ◽  
Boson Expansion

scholarly journals Investigation of $$\varXi _c^0$$ in a chiral quark model

2021 ◽  
Vol 81 (4) ◽  
Author(s):  
Xiaohuang Hu ◽  
Yue Tan ◽  
Jialun Ping
Keyword(s):  
Quark Model ◽  
Expansion Method ◽  
Invariant Mass Spectrum ◽  
Negative Parity ◽  
Lhcb Collaboration ◽  
Chiral Quark Model ◽  
Quantum Numbers ◽  
New States ◽  
Quark Structure ◽  
The Masses

AbstractRecently, three new states of $$\varXi _c^0$$ Ξ c 0 were observed in the invariant mass spectrum of $$\varLambda ^+_cK^-$$ Λ c + K - by LHCb collaboration. In this work, we use a chiral quark model to investigate these three exited states with the help of Gaussian expansion method both in three-quark structure and in five-quark structure with all possible quantum numbers $$IJ^P=\frac{1}{2}(\frac{1}{2})^-$$ I J P = 1 2 ( 1 2 ) - , $$\frac{1}{2}(\frac{3}{2})^-$$ 1 2 ( 3 2 ) - , $$\frac{1}{2}(\frac{5}{2})^-$$ 1 2 ( 5 2 ) - , $$\frac{3}{2}(\frac{1}{2})^-$$ 3 2 ( 1 2 ) - , $$\frac{3}{2}(\frac{3}{2})^-$$ 3 2 ( 3 2 ) - and $$\frac{3}{2}(\frac{5}{2})^-$$ 3 2 ( 5 2 ) - . The calculations shows that the masses of 2S and 1D states of $$\varXi _c$$ Ξ c are comparable to experimental results; In addition, the resonance states of five-quark configuration are possible candidates of these new states with negative parity by using the real scaling method and their decay width is also given.

Electron Scattering in Solids

1990 ◽  
Vol 48 (2) ◽  
pp. 4-5
Author(s):  
Ryuichi Shimizu ◽  
Ze-Jun Ding
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Angular Distribution ◽  
Elastic Scattering ◽  
Electron Scattering ◽  
Cross Sections ◽  
Expansion Method ◽  
Electron Excitation ◽  
Partial Wave Expansion ◽  
Backscattered Electrons

Monte Carlo simulation has been becoming most powerful tool to describe the electron scattering in solids, leading to more comprehensive understanding of the complicated mechanism of generation of various types of signals for microbeam analysis.The present paper proposes a practical model for the Monte Carlo simulation of scattering processes of a penetrating electron and the generation of the slow secondaries in solids. The model is based on the combined use of Gryzinski’s inner-shell electron excitation function and the dielectric function for taking into account the valence electron contribution in inelastic scattering processes, while the cross-sections derived by partial wave expansion method are used for describing elastic scattering processes. An improvement of the use of this elastic scattering cross-section can be seen in the success to describe the anisotropy of angular distribution of elastically backscattered electrons from Au in low energy region, shown in Fig.l. Fig.l(a) shows the elastic cross-sections of 600 eV electron for single Au-atom, clearly indicating that the angular distribution is no more smooth as expected from Rutherford scattering formula, but has the socalled lobes appearing at the large scattering angle.

An empirical review of gambling expansion and gambling-related harm

2018 ◽  
Vol 64 (5-6) ◽  
pp. 295-306 ◽  
Author(s):  
Debi A. LaPlante ◽  
Heather M. Gray ◽  
Pat M. Williams ◽  
Sarah E. Nelson
Keyword(s):  
Literature Review ◽  
Peer Review ◽  
Empirical Data ◽  
Empirical Studies ◽  
Expansion Method ◽  
Responsible Gambling ◽  
Review Literature ◽  
Evidence Based ◽  
Empirical Comparison ◽  
Related Harm

Abstract. Aims: To discuss and review the latest research related to gambling expansion. Method: We completed a literature review and empirical comparison of peer reviewed findings related to gambling expansion and subsequent gambling-related changes among the population. Results: Although gambling expansion is associated with changes in gambling and gambling-related problems, empirical studies suggest that these effects are mixed and the available literature is limited. For example, the peer review literature suggests that most post-expansion gambling outcomes (i. e., 22 of 34 possible expansion outcomes; 64.7 %) indicate no observable change or a decrease in gambling outcomes, and a minority (i. e., 12 of 34 possible expansion outcomes; 35.3 %) indicate an increase in gambling outcomes. Conclusions: Empirical data related to gambling expansion suggests that its effects are more complex than frequently considered; however, evidence-based intervention might help prepare jurisdictions to deal with potential consequences. Jurisdictions can develop and evaluate responsible gambling programs to try to mitigate the impacts of expanded gambling.

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