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Nuclear Theory·nucl-th

Monday·August 12, 2019

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    Microscopic calculation of inelastic proton scattering off O, Be, Be, and C for study of neutron excitation in neutron-rich nuclei

    Yoshiko Kanada-En'yo · Kazuyuki Ogata

    The microscopic coupled-channel calculation of inelastic proton scattering is performed for the study of neutron excitations in states of O, Be, Be, and C. Proton-nucleus potentials in the coupled-channel calculation are microscopically derived by folding the Melbourne -matrix interaction with matter and transition densities of target nuclei obtained by the structure model calculation of antisymmetrized molecular dynamics. The calculated result reasonably reproduces the elastic and inelastic proton scattering cross sections, and supports the dominant contribution of neutron in the excitation of Be and C as well as O. Sensitivity of the inelastic scattering cross sections to the neutron transition density is discussed. The exotic feature of the neutron transition density with the amplitude in the outer region in Be and C is focused.

    nucl-thPRC(2019)·16 citations
  2. 02

    Structure of odd-odd Cs isotopes within the interacting boson-fermion-fermion model based on the Gogny-D1M energy density functional

    K. Nomura · R. Rodríguez-Guzmán · L. M. Robledo

    The spectroscopic properties of the odd-odd isotopes Cs have been studied within the interacting boson-fermion-fermion model based on the Gogny-D1M energy density functional framework. Major ingredients to build the interacting boson-fermion-fermion Hamiltonian, such as the ()-deformation energy surfaces for the even-even core nuclei Xe as well as single-particle energies and occupation probabilities of the odd nucleons, have been computed microscopically with the constrained Hartree-Fock-Bogoliubov method. A few coupling constants of the boson-fermion and residual neutron-proton interactions are fitted to reproduce with a reasonable accuracy the experimental excitation energy of the low-lying levels of the odd-mass and odd-odd nuclei. The method is applied to describe the low-energy low-spin spectra of the odd-odd Cs nuclei and the band structures of higher-spin higher-energy states, mainly based on the configuration. Many of those odd-odd Cs nuclei have been identified as candidates for exhibiting chiral doublet bands.

    nucl-thnucl-exPRC(2020)·18 citations
  3. 03

    Coriolis terms in Skyrmion Quantization

    J. I. Rawlinson🇬🇧

    We consider the problem of quantizing a Skyrmion which is allowed to vibrate, rotate and isorotate. Previous approaches have neglected the interactions between vibrations and zero modes (analogous to so-called Coriolis terms in the molecular physics literature). A new formalism incorporating these interactions is introduced, inspired by a principal bundle approach to deformable-body dynamics. We quantize the B=4 and B=7 Skyrmions and compare the results to observed nuclear properties of Helium-4 and the Lithium-7/Beryllium-7 isospin doublet.

    nucl-thhep-thNPB(2019)·14 citations
  4. 04

    Shell-model-like approach based on cranking covariant density functional theory with a separable pairing force

    BinWu Xiong

    The shell-model-like approach (SLAP) based on cranking covariant density functional theory (CDFT) with a separable pairing force is developed. The developed cranking CDFT-SLAP with separable pairing force is applied to investigate the rotational spectra in Fe, including the positive-parity yrast band and two negative-parity signature partner bands, in comparison with the cranking CDFT-SLAP with monopole pairing force calculations. Excellent agreement with the available data is achieved.

    nucl-thPRC(2020)·7 citations
  5. 05

    Towards analog quantum simulations of lattice gauge theories with trapped ions

    Zohreh Davoudi🇺🇸 · Mohammad Hafezi🇺🇸 · Christopher Monroe🇺🇸 · Guido Pagano🇺🇸 · Alireza Seif🇺🇸 · Andrew Shaw🇺🇸

    Gauge field theories play a central role in modern physics and are at the heart of the Standard Model of elementary particles and interactions. Despite significant progress in applying classical computational techniques to simulate gauge theories, it has remained a challenging task to compute the real-time dynamics of systems described by gauge theories. An exciting possibility that has been explored in recent years is the use of highly-controlled quantum systems to simulate, in an analog fashion, properties of a target system whose dynamics are difficult to compute. Engineered atom-laser interactions in a linear crystal of trapped ions offer a wide range of possibilities for quantum simulations of complex physical systems. Here, we devise practical proposals for analog simulation of simple lattice gauge theories whose dynamics can be mapped onto spin-spin interactions in any dimension. These include 1+1D quantum electrodynamics, 2+1D Abelian Chern-Simons theory coupled to fermions, and 2+1D pure Z2 gauge theory. The scheme proposed, along with the optimization protocol applied, will have applications beyond the examples presented in this work, and will enable scalable analog quantum simulation of Heisenberg spin models in any number of dimensions and with arbitrary interaction strengths.

    ↳ quant-phhep-lathep-phnucl-th+1PRResearch(2020)·165 citations
  6. 06

    Gravitational Waves from Holographic Neutron Star Mergers

    Christian Ecker🇳🇱 · Matti Järvinen🇳🇱 · Govert Nijs🇳🇱 · Wilke van der Schee🇳🇱

    We simulate the merger of binary neutron stars and analyze the spectral properties of their gravitational waveforms. For the stars we construct hybrid equations of state (EoSs) with a standard nuclear matter EoS at low densities, transitioning to a state-of-the-art holographic EoS in the otherwise intractable high density regime. Depending on the transition density the characteristic frequencies in the spectrum produced from the hybrid EoSs are shifted to significantly lower values as compared to the pure nuclear matter EoS. The highest rest-mass density reached outside a possible black hole horizon is approximately g/cm, which for the holographic model is below the density of the deconfined quark matter phase.

    ↳ astro-ph.HEgr-qchep-phhep-th+1PRD(2020)·81 citations
  7. 07

    Entanglement and collective flavor oscillations in a dense neutrino gas

    Michael J. Cervia🇺🇸 · Amol V. Patwardhan🇺🇸 · A. B. Balantekin🇺🇸 · S. N. Coppersmith🇺🇸 · Calvin W. Johnson🇺🇸

    We investigate the importance of going beyond the mean-field approximation in the dynamics of collective neutrino oscillations. To expand our understanding of the coherent neutrino oscillation problem, we apply concepts from many-body physics and quantum information theory. Specifically, we use measures of nontrivial correlations (otherwise known as "entanglement") between the constituent neutrinos of the many-body system, such as the entanglement entropy and the Bloch vector of the reduced density matrix. The relevance of going beyond the mean field is demonstrated by comparisons between the evolution of the neutrino state in the many-body picture vs the mean-field limit, for different initial conditions.

    ↳ hep-phastro-ph.HEnucl-thquant-phPRD(2019)·83 citations

Affiliations

first authorsco-authorsvia INSPIRE