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Nuclear Theory·nucl-th

Thursday·May 24, 2018

9 papers—3 primary·6 cross-listed

All9Primary3Cross-lists6
  1. 01

    Unitary evolution with fluctuations and dissipation

    Aurel Bulgac · Shi Jin · Ionel Stetcu

    We outline an extension of the classical Langevin equation to a quantum formulation of the treatment of dissipation and fluctuations of all collective degrees of freedom with unitary evolution of a many-fermion system within an extension of the time-dependent density functional theory. We illustrate the method by computing the distribution of fission fragment yields for Fm in a quantum hydrodynamic approach and a typical trajectory with full unrestricted density functional theory augmented with dissipation and fluctuations.

    nucl-thPRC(2019)·40 citations
  2. 02

    Dynamically integrated transport approach for heavy-ion collisions at high baryon density

    Yukinao Akamatsu🇯🇵 · Masayuki Asakawa🇯🇵 · Tetsufumi Hirano🇯🇵 · Masakiyo Kitazawa🇯🇵 · Kenji Morita🇵🇱 · Koichi Murase🇯🇵 · Yasushi Nara🇯🇵 · Chiho Nonaka🇯🇵 · Akira Ohnishi🇯🇵

    We develop a new dynamical model for high energy heavy-ion collisions in the beam energy region of the highest net-baryon densities on the basis of non-equilibrium microscopic transport model JAM and macroscopic 3+1D hydrodynamics by utilizing a dynamical initialization method. In this model,dynamical fluidization of a system is controlled by the source terms of the hydrodynamic fields. In addition, time dependent core-corona separation of hot regions is implemented. We show that our new model describes multiplicities and mean transverse mass in heavy-ion collisions within a beam energy region of GeV. Good agreement of the beam energy dependence of the ratio is obtained, which is explained by the fact that a part of the system is not thermalized in our core-corona approach.

    nucl-thhep-phnucl-exPRC(2018)·87 citations
  3. 03

    Nuclear Structure from the In-Medium Similarity Renormalization Group

    Heiko Hergert🇺🇸 · Jiangming Yao🇺🇸 · Titus D. Morris🇺🇸 · Nathan M. Parzuchowski🇺🇸 · Scott K. Bogner🇺🇸 · Jonathan Engel🇺🇸

    Efforts to describe nuclear structure and dynamics from first principles have advanced significantly in recent years. Exact methods for light nuclei are now able to include continuum degrees of freedom and treat structure and reactions on the same footing, and multiple approximate, computationally efficient many-body methods have been developed that can be routinely applied for medium-mass nuclei. This has made it possible to confront modern nuclear interactions from Chiral Effective Field Theory, that are rooted in Quantum Chromodynamics with a wealth of experimental data. Here, we discuss one of these efficient new many-body methods, the In-Medium Similarity Renormalization Group (IMSRG), and its applications in modern nuclear structure theory. The IMSRG evolves the nuclear many-body Hamiltonian in second-quantized form through continuous unitary transformations that can be implemented with polynomial computational effort. Through suitably chosen generators, we drive the matrix representation of the Hamiltonian in configuration space to specific shapes, e.g., to implement a decoupling of low- and high-energy scales, or to extract energy eigenvalues for a given nucleus. We present selected results from Multireference IMSRG (MR-IMSRG) calculations of open-shell nuclei, as well as proof-of-principle applications for intrinsically deformed medium-mass nuclei. We discuss the successes and prospects of merging the (MR-)IMSRG with many-body methods ranging from Configuration Interaction to the Density Matrix Renormalization Group, with the goal of achieving an efficient simultaneous description of dynamic and static correlations in atomic nuclei.

    nucl-thJ.Phys.Conf.Ser.(2018)·18 citations

Affiliations

first authorsco-authorsvia INSPIRE