Coupled channel NN interaction in the Gamow separable approximation

In this study the calculations of the total fusion reaction cross section have been performed for fusion reaction systems 17F + 208Pb and 15C + 232Th which involving halo nuclei by using a semiclassical approach.The semiclassical treatment is comprising the WKB approximation to describe the relative motion between target and projectile nuclei, and Continuum Discretized Coupled Channel (CDCC) method to describe the intrinsic motion for both target and projectile nuclei. For the same of comparsion a full quantum mechanical clacualtions have been preforemd using the (CCFULL) code. Our theorticalrestuls are compared with the full quantum mechaincialcalcuations and with the recent experimental data for the total fusion reaction Â checking the stability of the distancesThe coupled channel calculations of the total fusion cross section Ïƒfus, and the fusion barrier distribution Dfus. The comparsion with experiment proves that the semiclassiacl approach adopted in the present work reproduce the experimental data better that the full quantal mechanical calcautions.Â

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GRAIN-SIZE VARIATIONS AND COUPLED CHANNEL-HILLSLOPE EVOLUTION ALONG A TECTONIC GRADIENT, BOLINAS RIDGE, CALIFORNIA

10.1130/abs/2020cd-346840 ◽

2020 ◽

Author(s):

Pichawut Manopkawee ◽

◽

Eric Kirby

Keyword(s):

Grain Size ◽

Hillslope Evolution ◽

Coupled Channel

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Coupled-Channel Interpretation of the LHCb Double- J/ψ Spectrum and Hints of a New State Near the J/ψJ/ψ Threshold

Physical Review Letters ◽

10.1103/physrevlett.126.132001 ◽

2021 ◽

Vol 126 (13) ◽

Author(s):

Xiang-Kun Dong ◽

Vadim Baru ◽

Feng-Kun Guo ◽

Christoph Hanhart ◽

Alexey Nefediev

Keyword(s):

Coupled Channel

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Tensor-structured algorithm for reduced-order scaling large-scale Kohn–Sham density functional theory calculations

npj Computational Materials ◽

10.1038/s41524-021-00517-5 ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

Chih-Chuen Lin ◽

Phani Motamarri ◽

Vikram Gavini

Keyword(s):

Density Functional Theory ◽

Density Functional ◽

Large Scale ◽

Density Functional Theory Calculations ◽

System Size ◽

Real Space ◽

Functional Theory ◽

Reduced Order ◽

Separable Approximation ◽

Tensor Basis

AbstractWe present a tensor-structured algorithm for efficient large-scale density functional theory (DFT) calculations by constructing a Tucker tensor basis that is adapted to the Kohn–Sham Hamiltonian and localized in real-space. The proposed approach uses an additive separable approximation to the Kohn–Sham Hamiltonian and an L1 localization technique to generate the 1-D localized functions that constitute the Tucker tensor basis. Numerical results show that the resulting Tucker tensor basis exhibits exponential convergence in the ground-state energy with increasing Tucker rank. Further, the proposed tensor-structured algorithm demonstrated sub-quadratic scaling with system-size for both systems with and without a gap, and involving many thousands of atoms. This reduced-order scaling has also resulted in the proposed approach outperforming plane-wave DFT implementation for systems beyond 2000 electrons.

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