PaperPanorama
FAQ

Nuclear Theory·nucl-th

Wednesday·April 12, 2017

9 papers—6 primary·3 cross-listed

All9Primary6Cross-lists3
  1. 01

    [Submitted on 11 Apr 2017]

    Effects of enhanced bulk viscosity near the QCD critical point

    Akihiko Monnai🇫🇷 · Swagato Mukherjee🇺🇸 · Yi Yin🇺🇸

    Search for the conjectured QCD critical point is one of the major scientific goals for the Beam Energy Scan program at RHIC. The growth of the correlation length is a universal feature for systems near criticality, and bulk viscosity exhibits the strongest dependence on the correlation length. We investigate its effects using a relativistic hydrodynamic model to find that rapidity distributions of charged particles and net baryon number are visibly modified if the fireball passes through the vicinity of the QCD critical point on the phase diagram. We also discuss how critical modification of dilepton emission rate may leave imprints on invariant mass spectra.

    Comments:
    4 pages, 6 figures - To appear in the conference proceedings for Quark Matter 2017, February 5-11, Chicago, Illinois, USA
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1704.03120 [pdf]
    NPA(2017)·6 citations
  2. 02

    [Submitted on 11 Apr 2017]

    Correlated-Gaussian approach to linear-chain states -Case of four -particles-

    Y. Suzuki · W. Horiuchi

    We show that correlated Gaussians with good angular momentum and parity provide flexible basis functions for specific elongated shape. As its application we study linear-chain states of four-alpha particles in variation-after-projection calculations in which all the matrix elements are evaluated analytically. We find possible chain states for , , and perhaps with the bandhead energy being about 33 MeV from the ground state of O. No chain states with are found. The nature of the rotational sequence of the chain states is clarified in contrast to a rigid-body rotation. The quadrupole deformation parameters estimated from the chain states increase from 0.59 to 1.07 for to . This work suggests undeveloped fields for the correlated Gaussians beyond those problems which have hitherto been solved successfully.

    Comments:
    13 pages, 6 figures, accepted for publication in Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1704.03123 [pdf]
    PRC(2017)·12 citations
  3. 03

    [Submitted on 11 Apr 2017]

    Structural Properties of Finite and Infinite Nuclear Systems and Related Phenomena

    Subrata Kumar Biswal

    In the present thesis, we have carried a thorough investigation of nuclear structure properties. We start our investigation from the study of the magic property of nucleus in the super -heavy region. We know the magic combination of proton and neutron in the light and medium heavy region. But in the super-heavy region, it is still unclear. We applied SEI (simple effective interaction ) and RMF (relativistic mean field ) formalism with a different parameter sets to predict the magic combinations and it turned out Z=114, 120, 126 with N=184. We have also studied theisoscalar giant monopole resonance energy of nucleus of Z=114, 120,126, with scaling and constrained method using RETF formalism. Isoscalar giant monopole resonance (ISGMR) is also known as the breathing mode. We have a developed a new constrained type calculation for the ISGMR and IVGDR. Effects of delta meson on the neutron system also discuses extensively.

    Comments:
    PhD thesis, Homi Bhabha National Institute, Feb 2017
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1704.03156 [pdf]
    DAE Symp.Nucl.Phys.(2016)·0 citations
  4. 04

    [Submitted on 11 Apr 2017]

    Elastic Scattering Phenomenology

    R.S. Mackintosh

    We argue that, in many situations, fits to elastic scattering data that were historically, and frequently still are, considered `good', are not justifiably so describable. Information about the dynamics of nucleon-nucleus and nucleus-nucleus scattering is lost when elastic scattering phenomenology is insufficiently ambitious. It is argued that in many situations, an alternative approach is appropriate for the phenomenology of nuclear elastic scattering of nucleons and other light nuclei. The approach affords an appropriate means of evaluating folding models, one that fully exploits available empirical data. It is particularly applicable for nucleons and other light ions.

    Comments:
    10 pages
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1704.03230 [pdf]
    EPJA(2017)·4 citations
  5. 05

    [Submitted on 11 Apr 2017]

    Bayesian truncation errors in chiral effective field theory: nucleon-nucleon observables

    J.A. Melendez · S. Wesolowski · R.J. Furnstahl

    Chiral effective field theory (EFT) predictions are necessarily truncated at some order in the EFT expansion, which induces an error that must be quantified for robust statistical comparisons to experiment. In previous work, a Bayesian model for truncation errors of perturbative expansions was adapted to EFTs. The model yields posterior probability distribution functions (pdfs) for these errors based on expectations of naturalness encoded in Bayesian priors and the observed order-by-order convergence pattern of the EFT. A first application was made to chiral EFT for neutron-proton scattering using the semi-local potentials of Epelbaum, Krebs, and Meißner (EKM). Here we extend this application to consider a larger set of regulator parameters, energies, and observables as a general example of a statistical approach to truncation errors. The Bayesian approach allows for statistical validations of the assumptions and enables the calculation of posterior pdfs for the EFT breakdown scale. The statistical model is validated for EKM potentials whose convergence behavior is not distorted by regulator artifacts. For these cases, the posterior for the breakdown scale is consistent with EKM assumptions.

    Comments:
    24 pages. Corresponds to published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Data Analysis, Statistics and Probability (physics.data-an)
    arXiv:
    1704.03308 [pdf]
    PRC(2017)·188 citations
  6. 06

    [Submitted on 11 Apr 2017]

    Goodness of Generalized Seniority in Semi-magic Nuclei

    Ashok Kumar Jain · Bhoomika Maheshwari

    Symmetry plays an important role in understanding the nuclear structure properties from the rotation of a nucleus to the spin, parity and isospin of nuclear states. This simplifies the complexity of the nuclear problems in one way or the other. Seniority is also a well known quantum number which arises due to the symmetry in the pairing interaction of nuclei. We present empirical as well as theoretical evidences based on decay rates which support the goodness of seniority at higher spins as well as in nrich or, n-deficient nuclei. We find that the generalized seniority governs the identical trends of high-spin isomers in different semi-magic chains, where different set of nucleon orbitals from different valence spaces are involved.

    Comments:
    11 Figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1704.03337 [pdf]
    Nucl.Phys.Rev.(2017)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE