PaperPanorama
FAQ

Nuclear Theory·nucl-th

Wednesday·September 23, 2020

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 01

    [Submitted on 22 Sept 2020]

    Ab-initio no-core shell model study of B isotopes with realistic NN interactions

    Priyanka Choudhary · Praveen C. Srivastava · Petr Navrátil

    We report a comprehensive study of B isotopes within the \textit{ab-initio} no-core shell model (NCSM) using realistic nucleon-nucleon (\textit{NN}) interactions. In particular, we have applied the inside non-local outside Yukawa (INOY) interaction to study energy spectra, electromagnetic properties and point-proton radii of the boron isotopes. The NCSM results with the charge-dependent Bonn 2000 (CDB2K), the chiral next-to-next-to-next-to-leading order (NLO) and optimized next-to-next-to-leading order (NLO) interactions are also reported. We have reached basis sizes up to = 10 for B, = 8 for B and = 6 for B with m-scheme dimensions up to 1.7 billion. We also compare the NCSM calculations with the phenomenological YSOX interaction using the shell model to test the predictive power of the \textit{ab-initio} nuclear theory. Overall, our NCSM results are consistent with the available experimental data. The experimental ground state spin of B has been reproduced using the INOY \textit{NN} interaction. Typically, the 3\textit{N} interaction is required to correctly reproduce the aforementioned state.

    Comments:
    16 pages, 9 figures, accepted in Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2009.10257 [pdf]
    PRC(2020)·33 citations
  2. 02

    [Submitted on 22 Sept 2020]

    Pairing vibrations in the interacting boson model based on density functional theory

    K. Nomura · D. Vretenar · Z. P. Li · J. Xiang

    We propose a method to incorporate the coupling between shape and pairing collective degrees of freedom in the framework of the interacting boson model (IBM), based on the nuclear density functional theory. To account for pairing vibrations, a boson-number non-conserving IBM Hamiltonian is introduced. The Hamiltonian is constructed by using solutions of self-consistent mean-field calculations based on a universal energy density functional and pairing force, with constraints on the axially-symmetric quadrupole and pairing intrinsic deformations. By mapping the resulting quadrupole-pairing potential energy surface onto the expectation value of the bosonic Hamiltonian in the boson condensate state, the strength parameters of the boson Hamiltonian are determined. An illustrative calculation is performed for Xe, and the method is further explored in a more systematic study of rare-earth isotones. The inclusion of the dynamical pairing degree of freedom significantly lowers the energies of bands based on excited states. The results are in quantitative agreement with spectroscopic data, and are consistent with those obtained using the collective Hamiltonian approach.

    Comments:
    14 pages, 13 figures, 6 tables
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2009.10374 [pdf]
    PRC(2020)·15 citations
  3. 03

    [Submitted on 19 Sept 2020]

    Event rates for the scattering of weakly interacting massive particles from Na and Ar

    R. Sahu · V.K.B. Kota

    Detection rates for the elastic and inelastic scattering of weakly interacting massive particles (WIMP) off Na are calculated within the framework of Deformed Shell Model (DSM) based on Hartree-Fock states. First the spectroscopic properties like energy spectra and magnetic moments are calculated and compared with experiment. Following the good agreement for these, DSM wave functions are used for obtaining elastic and inelastic spin structure functions, nuclear structure coefficients etc. for the WIMP-Na scattering. Then, the event rates are also calculated with a given set of supersymmetric parameters. In the same manner, using DSM wavefunctions, nuclear structure coefficients and event rates for elastic scattering of WIMP from Ar are also obtained. These results for event rates and also for annual modulation will be useful for the upcoming and future WIMP detection experiments involving detectors with Na and Ar.

    Comments:
    arXiv admin note: substantial text overlap with arXiv:2004.04055, arXiv:1706.08112
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2009.10522 [pdf]
    Particles(2021)·5 citations
  4. 04

    [Submitted on 22 Sept 2020]

    Quarkonium in Quark-Gluon Plasma: Open Quantum System Approaches Re-examined

    Yukinao Akamatsu🇯🇵

    Dissociation of quarkonium in quark-gluon plasma (QGP) is a long standing topic in relativistic heavy-ion collisions because it has been believed to signal one of the fundamental natures of the QGP -- Debye screening due to the liberation of color degrees of freedom. Among recent new theoretical developments is the application of open quantum system framework to quarkonium in the QGP. Open system approach enables us to describe how dynamical as well as static properties of QGP influences the time evolution of quarkonium in a coherent way. Currently, there are several master equations for quarkonium corresponding to various scale assumptions, each derived in different theoretical frameworks. In this review, all of the existing master equations are systematically rederived as Lindblad equations in a unified framework. Also, as one of the most relevant descriptions in relativistic heavy-ion collisions, quantum Brownian motion of heavy quark pair in the QGP is studied in detail. The quantum Brownian motion is parametrized by a few fundamental quantities of QGP such as real and imaginary parts of heavy quark potential (complex potential), heavy quark momentum diffusion constant, and thermal dipole self-energy constant, which constitute in-medium self-energy of a static quarkonium. This indicates that the yields of quarkonia such as and in the relativistic heavy-ion collisions have the potential to determine these fundamental quantities.

    Comments:
    v2: 77 pages, 1 figure. Final draft of a review article accepted by Progress in Particle and Nuclear Physics
    Subjects:
    Nuclear Theory (nucl-th); Statistical Mechanics (cond-mat.stat-mech); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2009.10559 [pdf]
    PPNP(2022)·123 citations
  5. 05

    [Submitted on 22 Sept 2020]

    BigApple force and its implications to finite nuclei and astrophysical objects

    H. C. Das · Ankit Kumar · Bharat Kumar · S. K. Biswal · S. K. Patra

    The secondary component of the GW190814 event left us with a question, "whether it is a supermassive neutron star or lightest black-hole?". Recently, Fattoyev et al. have obtained an energy density functional (EDF) named as BigApple, which reproduces the mass of the neutron star is 2.60 which is well consistent with GW190814 data. This study explores the properties of finite nuclei, nuclear matter, and neutron stars by using the BigApple EDF along with four well-known relativistic mean-field forces, namely NL3, G3, IOPB-I, and FSUGarnet. The finite nuclei properties like binding energy per particle, skin thickness, charge radius, single-particle energy, and two-neutron separation energy are well predicted by the BigApple for a series of nuclei. The calculated nuclear matter quantities such as incompressibility, symmetry energy, and slope parameters at saturation density are consistent with the empirical or experimental values where ever available. The predicted canonical tidal deformability by the BigApple parameter set is well-matched with the GW190814 data. Also, the dimensionless moment of inertia lies in the range given by the analysis of PSR J0737-3039A.

    Comments:
    26 pages, 15 figures, 4 tables. Published in IJMPE
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2009.10690 [pdf]
    IJMPE(2021)·25 citations

Affiliations

first authorsco-authorsvia INSPIRE