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Nuclear Theory·nucl-th

Thursday·March 14, 2019

9 papers—6 primary·3 cross-listed

All9Primary6Cross-lists3
  1. 01

    Local chiral EFT potentials in nuclei and neutron matter: results and issues

    Diego Lonardoni · Ingo Tews

    In recent years, the combination of advanced quantum Monte Carlo (QMC) methods and local interactions derived from chiral effective field theory (EFT) has been shown to provide a versatile and systematic approach to nuclear systems. Calculations at next-to-next-to-leading order in chiral EFT have lead to fascinating results for nuclei and nucleonic matter. On the one hand, ground-state properties of nuclei are well reproduced up to , even though these potentials have been fit to nucleon-nucleon scattering and few-body observables only. On the other hand, a reasonable description of neutron-matter properties emerges. While regulator functions applied to two- and three-nucleon forces are a necessary ingredient in these many-body calculations, the use of local regulators leads to a substantial residual regulator and cutoff dependence that increases current theoretical uncertainties. In this contribution, we review local chiral interactions, their applications, and QMC results for nuclei and neutron matter. In addition, we address regulator issues for such potentials and present a possible path forward.

    nucl-thPoS(2019)·0 citations
  2. 02

    Systematic study of unfavored decay half-lives of closed shell nuclei related to ground and isomeric states

    Jun-Gang Deng · Jie-Cheng Zhao · Dong Xiang · Xiao-Hua Li

    In present work, the unfavored decay half-lives and preformation probabilities of closed shell nuclei related to ground and isomeric states around , and 126 shell closures are investigated by adopting two-potential approach from the perspective of valence nucleon (hole) and isospin asymmetry of the parent nucleus. The results indicate that preformation probability is linear dependence on or , the same as the case of favored decay in our previous work [X.-D. Sun \textit{et al.}, Phys. Rev. C 94, 024338 (2016)]. , , and represent the number of valence protons (holes), the number of valence neutrons (holes), and the isospin of the parent nucleus, respectively. Fitting the preformation probabilities data extracted from the differences between experimental data and calculated half-lives without a shell correction, we give two linear formulas of the preformation probabilities and the values of corresponding parameters. Based on the formulas and corresponding parameters, we calculate the decay half-lives for those nuclei. The calculated results can well reproduce the experimental data.

    nucl-thPRC(2017)·42 citations
  4. 04

    Heavy ion charge exchange reactions and the link with beta decay processes

    M.Colonna🇮🇹 · J.I.Bellone🇮🇹 · S.Burrello🇮🇹 · J-A Lay🇪🇸 · H.Lenske🇩🇪

    Within the DWBA framework, we develop a theoretical description of single and double heavy ion charge exchange (CE) reactions. We show that absorption effects are particularly important for heavy ion reactions, leading to a noticeable reduction of the CE cross sections. At low momentum transfer, the single CE cross section can be factorised, thus allowing to evaluate corresponding distortion factors and access beta decay strengths. Applications are shown for a system of experimental interest. Preliminary results are discussed also for double CE reactions, modeled as a two-step mechanisms, i.e. a sequence of two charge-changing processes.

    nucl-thCERN Proc.(2019)·0 citations
  5. 05

    Opportunities for Nuclear Physics & Quantum Information Science

    Ian C. Cloët🇺🇸 · Matthew R. Dietrich🇺🇸 · John Arrington🇺🇸 · Alexei Bazavov🇺🇸 · Michael Bishof🇺🇸 · Adam Freese🇺🇸 · Alexey V. Gorshkov🇺🇸 · Anna Grassellino🇺🇸 · Kawtar Hafidi🇺🇸 · Zubin Jacob🇺🇸 · Michael McGuigan🇺🇸 · Yannick Meurice🇺🇸 and 14 other authors

    This whitepaper is an outcome of the workshop Intersections between Nuclear Physics and Quantum Information held at Argonne National Laboratory on 28-30 March 2018 [www.phy.anl.gov/npqi2018/]. The workshop brought together 116 national and international experts in nuclear physics and quantum information science to explore opportunities for the two fields to collaborate on topics of interest to the U.S. Department of Energy (DOE) Office of Science, Office of Nuclear Physics, and more broadly to U.S. society and industry. The workshop consisted of 22 invited and 10 contributed talks, as well as three panel discussion sessions. Topics discussed included quantum computation, quantum simulation, quantum sensing, nuclear physics detectors, nuclear many-body problem, entanglement at collider energies, and lattice gauge theories.

    nucl-thhep-exnucl-exphysics.atom-ph+148 citations
  6. 06

    Estimates of hyperon polarization in heavy-ion collisions at collision energies 4--40 GeV

    Yu. B. Ivanov🇷🇺 · V. D. Toneev🇷🇺 · A. A. Soldatov🇷🇺

    Global polarization of and hyperons in Au+Au collisions at collision energies 4-40 GeV in the midrapidity region and total polarization, i.e. averaged over all rapidities, are studied within the scope of the thermodynamical approach. The relevant vorticity is simulated within the model of the three-fluid dynamics (3FD). It is found that the performed rough estimate of the global midrapidity polarization quite satisfactorily reproduces the experimental STAR data on the polarization, especially its collision-energy dependence. The total polarization increases with the collision energy rise, which is in contrast to the decrease of the midrapidity polarization. This suggests that at high collision energies the polarization reaches high values in fragmentation regions.

    nucl-thhep-phnucl-exPRC(2019)·72 citations

Affiliations

first authorsco-authorsvia INSPIRE