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We perform Time Dependent Hartree-Fock (TDHF) calculations to investigate the small amplitude dipole response of selected neutron-rich nuclei and Sn isotopes. A detailed comparison with the dipole strength predicted by Random-Phase…

核理论 · 物理学 2019-06-05 S. Burrello , M. Colonna , G. Colò , D. Lacroix , X. Roca-Maza , G. Scamps , H. Zheng

Apart from the Bell nonlocality, which deals with the correlations generated from the local input-output statistics, quantum theory exhibits another kind of nonlocality that involves the indistiguishability of the locally preparable set of…

Photoabsorption cross sections and gamma-decay strength function are calculated and compared with experimental data to test the existing models of dipole radiative strength functions (RSF) for the middle-weight and heavy atomic nuclei.…

A semi-microscopic model for the low-energy photodisintegration of the 9Be nucleus is constructed, and the experimental data are analyzed with its help. The older radioactive isotope data are supported by this analysis. The theoretical…

核理论 · 物理学 2009-10-31 V. D. Efros , H. Oberhummer , A. Pushkin , I. J. Thompson

Locally constant crossed field approximation (LCFA) is a powerful tool for theoretical and numerical studies of various strong field quantum electrodynamical effects. We explore this approximation in detail for photon emission by a spinless…

高能物理 - 唯象学 · 物理学 2023-07-19 E. G. Gelfer , A. M. Fedotov , A. A. Mironov , S. Weber

A simple technique is described, that provides improved nearside-farside (NF) decompositions of elastic scattering amplitudes. The technique, involving the resummation of a Legendre partial wave series, reduces the importance of unphysical…

核理论 · 物理学 2013-05-29 R. Anni , J. N. L. Connor , C. Noli

We treat low-energy $^3$He-$\alpha$ elastic scattering in an Effective Field Theory (EFT) that exploits the separation of scales in this reaction. We compute the amplitude up to Next-to-Next-to-Leading Order (NNLO), developing a hierarchy…

核理论 · 物理学 2022-07-06 Maheshwor Poudel , Daniel R. Phillips

A method to extract primary $\gamma$-ray spectra from particle-$\gamma$ coincidences at excitation energies up to the neutron binding energy is described. From these spectra, the level density and $\gamma$-ray strength function can be…

核实验 · 物理学 2007-05-23 M. Guttormsen , M. Hjorth-Jensen , J. Rekstad , S. Siem , A. Schiller , A. Voinov

This contribution reviews the present status of the Skyrme-Hartree-Fock (SHF) approach as one of the leading self-consistent mean-field models in the physics of atomic nuclei. It starts with a brief summary of the formalism and strategy for…

核理论 · 物理学 2016-01-26 P. -G. Reinhard

We report an ab initio evaluation of the surface energy of a simple metal, performed via a coupling-constant integration over the dynamical density-response function. The rapid rate of change of the electron density at the surface is…

材料科学 · 物理学 2009-10-30 J. M. Pitarke , A. G. Eguiluz

Simplifying expressions is important to make numerical integration of large expressions from High Energy Physics tractable. To this end, Horner's method can be used. Finding suitable Horner schemes is assumed to be hard, due to the lack of…

人工智能 · 计算机科学 2014-09-19 Ben Ruijl , Aske Plaat , Jos Vermaseren , Jaap van den Herik

We study the two-alpha-particle (alpha-alpha) system in an Effective Field Theory (EFT) for halo-like systems. We propose a power counting that incorporates the subtle interplay of strong and electromagnetic forces leading to a narrow…

核理论 · 物理学 2008-11-26 R. Higa , H. -W. Hammer , U. van Kolck

We propose a practical method to solve the random-phase approximation (RPA) in the self-consistent Hartree-Fock (HF) and density-functional theory. The method is based on numerical evaluation of the residual interactions utilizing finite…

核理论 · 物理学 2010-11-26 Takashi Nakatsukasa , Tsunenori Inakura , Kazuhiro Yabana

A method of calculating giant resonance strength functions using Time-Dependent Hartree-Fock techniques is described. An application to isoscalar giant monopole resonances in spherical nuclei is made, thus allowing a comparison between…

核理论 · 物理学 2009-11-10 P. D. Stevenson , M. R. Strayer , J. Rikovska Stone , W. G. Newton

The size of nuclei in histological preparations from excised breast tumors is predictive of patient outcome (large nuclei indicate poor outcome). Pathologists take into account nuclear size when performing breast cancer grading. In…

计算机视觉与模式识别 · 计算机科学 2016-06-21 Mitko Veta , Paul J. van Diest , Josien P. W. Pluim

In the framework of a recently reported linear-scaling method for density-functional-pseudopotential calculations, we investigate the use of localized basis functions for such work. We propose a basis set in which each local orbital is…

mtrl-th · 物理学 2009-10-30 E. Hernandez , M. J. Gillan , C. M. Goringe

New superheavy nuclei are often identified through their characteristic $\alpha$-decay energies, which requires accurate calculations of $Q_{\alpha}$ values. While many $Q_{\alpha}$ predictions are available, little is known about their…

核理论 · 物理学 2019-01-30 Erik Olsen , Witold Nazarewicz

Recent progresses in the description of the latter stage of nuclear fission are reported. Dynamical effects during the descent of the potential towards scission and in the formation of the fission fragments are studied with the…

核理论 · 物理学 2016-01-21 C. Simenel , G. Scamps , D. Lacroix , A. S. Umar

Effects of the non-Newtonian gravity on properties of finite nuclei are studied by consistently incorporating both the direct and exchange contribution of the Yukawa potential in the Hartree-Fock approach using a well-tested Skyrme force…

太阳与恒星天体物理 · 物理学 2013-02-13 Jun Xu , Bao-An Li , Lie-Wen Chen , Hao Zheng

Localized basis sets in the projector augmented wave formalism allow for computationally efficient calculations within density functional theory (DFT). However, achieving high numerical accuracy requires an extensive basis set, which also…

材料科学 · 物理学 2020-11-18 G. Gandus , A. Valli , D. Passerone , R. Stadler