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Nuclear Theory·nucl-th

Thursday·February 14, 2019

7 papers—2 primary·5 cross-listed

All7Primary2Cross-lists5
  1. 01

    Calculation and Verification of Irradiation Damage Cross Section with Energy-Angular Distribution

    Shengli Chen🇫🇷 · David Bernard🇫🇷 · Pierre Tamagno🇫🇷 · Cyrille De Saint Jean🇫🇷

    To complete the computation of Displacements per Atom (DPA) cross sections, the present work shows the methods of calculating DPA cross sections with the nuclear data of energy-angular distribution in both the laboratory and the Center-of-Mass (CM) frames. The method of direct calculation with data in the CM frame is proposed and recommended to decrease the computation burden and keep all information. Theoretical analyses reveal that more than 7-point Gauss-Legendre Quadrature (GLQ) should be used to ensure the convergence of the angular integration for DPA computations. Numerical results show that 8-point GLQ is sufficient for the continuum inelastic neutron scattering, while 64-point GLQ is implemented in NJOY. Because the integrand over secondary energy is not derivable in the whole domain of the secondary energy, the trapezoidal integration is used to perform the numerical integration. The numerical calculations show that the trapezoidal integration is suitable to perform the integration over the secondary energy on the fine grid given by nuclear data files at least for 56Fe. The present work reveals that the direct interpolation of energy-angular-integrated damage can give the same results computed with standard interpolated energy-angular distributions. The DPA cross sections will be overestimated if isotropic angular distributions are assumed. However, the first-order Legendre polynomial can give DPA cross sections within 0.4% deviation, while 12 orders are required to describe the anisotropic angular distribution.

    nucl-thphysics.app-phNuclear Inst. and Methods in Physics Rese…·0 citations
  2. 02

    Dynamically assisted nuclear fusion

    Friedemann Queisser🇩🇪 · Ralf Schützhold🇩🇪

    We consider the prototypical deuterium-tritium fusion reaction. At intermediate initial kinetic energies (in the keV regime), a major bottle-neck of this reaction is the Coulomb barrier between the nuclei, which is overcome by tunneling. Here, we study whether the tunneling probability can be enhanced by an additional electromagnetic field, such as an x-ray free electron laser (XFEL). We find that this dynamical assistance should be feasible with present-day or near future technology.

    nucl-thquant-phPRC(2019)·29 citations
  3. 03

    Neutrinoless Double-Beta Decay: Status and Prospects

    Michelle J. Dolinski🇺🇸 · Alan W. P. Poon🇺🇸 · Werner Rodejohann🇩🇪

    Neutrinoless double-beta decay is a forbidden, lepton-number-violating nuclear transition whose observation would have fundamental implications for neutrino physics, theories beyond the Standard Model and cosmology. In this review, we summarize the theoretical progress to understand this process, the expectations and implications under various particle physics models, as well as the nuclear physics challenges that affect the precise predictions of the decay half-life. We will also provide a synopsis of the current and future large-scale experiments that aim at discovering this process in physically well-motivated half-life ranges.

    ↳ nucl-exhep-exhep-phnucl-thAnn.Rev.Nucl.Part.Sci.(2019)·677 citations
  4. 04

    Gravitational Waves from Compact Dark Objects in Neutron Stars

    C. J. Horowitz🇺🇸 · Sanjay Reddy🇺🇸

    Dark matter could be composed of compact dark objects (CDOs). We find that the oscillation of CDOs inside neutron stars can be a detectable source of gravitational waves (GWs). The GW strain amplitude depends on the mass of the CDO, and its frequency is typically in the range 3-5 kHz as determined by the central density of the star. In the best cases, LIGO may be sensitive to CDO masses greater than or of order solar masses.

    ↳ astro-ph.HEgr-qchep-phnucl-thPRL(2019)·52 citations
  5. 05

    Theoretical predictions on polarization asymmetry for Drell-Yan process with spin-one deuteron and tensor-polarized structure function

    S. Kumano🇯🇵 · Qin-Tao Song🇯🇵

    We report recent theoretical progress on a polarization asymmetry in the proton-deuteron Drell-Yan process with a polarized-deuteron target and the tensor-polarized structure function . Experimental measurements are possible at JLab for and at Fermilab for the Drell-Yan process. First, we show a theoretical estimate for the proton-deuteron Drell-Yan asymmetry in the Fermilab-E1039 experiment. We evolved tensor-polarized parton distribution functions, which explain existing HERMES data, at GeV to the range of the Fermilab Drell-Yan measurements. Then, we predicted that the asymmetry is of the order of a few percent. The Drell-Yan experiment has an advantage to probe the tensor-polarized antiquark distributions, which were suggested by the HERMES experiment as a finite sum for (). Second, we predicted for the JLab experiment by the standard convolution model of the deuteron. Our theoretical structure function seems to be much different from the HERMES data. Furthermore, a significant distribution exists at very large () beyond the kinematical limit for the proton. Because the standard deuteron-model estimate is much different from the HERMES data, there could be an interesting development as a new hadron-physics field if future JLab data will be much different from our conventional prediction.

    ↳ hep-phhep-exhep-latnucl-thPoS(2019)·0 citations
  6. 06

    Light Nuclei from Lattice QCD: Spectrum, Structure and Reactions

    Zohreh Davoudi🇺🇸

    Lattice Quantum Chromodynamics (LQCD) studies of light nuclei have entered an era when first results on structure and reaction properties of light nuclei have emerged in recent years, complementing existing results on their lowest-lying spectra. Although in these preliminary studies the quark masses are still set to larger than the physical values, a few results at the physical point can still be deduced from simple extrapolations in the quark masses. The progress paves the road towards obtaining several important quantities in nuclear physics, such as nuclear forces and nuclear matrix elements relevant for pp fusion, single and double-beta decay processes, neutrino-nucleus scattering, searches for CP violation, nuclear response in direct dark-matter detection experiments, as well as gluonic structure of nuclei for an Electron-Ion Collider (EIC) program. Some of the recent developments, the results obtained, and the outlook of the field will be briefly reviewed in this talk, with a focus on results obtained by the Nuclear Physics From LQCD (NPLQCD) collaboration.

    ↳ hep-lathep-phnucl-thSpringer Proc.Phys.(2020)·2 citations
  7. 07

    Quenching of hadron spectra in XeXe and PbPb collisions at the LHC

    François Arleo🇫🇷 · Guillaume Falmagne🇫🇷

    The dependence of the nuclear modification factor measured in PbPb collisions at the LHC exhibits a universal shape, which can be very well reproduced in a simple energy loss model based on the BDMPS medium-induced gluon spectrum. We update a former study by including in the analysis the recent CMS measurements on production in PbPb collisions at TeV and charged hadron production in XeXe collisions at TeV. The average parton energy loss extracted from minimum bias XeXe collisions is reduced typically by 20% compared to PbPb collisions, consistent with a length dependence with .

    ↳ hep-phhep-exnucl-thPoS(2019)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE