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Nuclear Theory·nucl-th

Tuesday·October 9, 2018

12 papers—4 primary·8 cross-listed

All12Primary4Cross-lists8
  1. 01

    On Mass correction to Chiral Vortical Effect and Chiral Separation Effect

    Shu Lin🇨🇳 · Lixin Yang🇨🇳

    We study coefficients of axial chiral vortical effect and chiral separation effect at finite temperature and vector chemical potential in massive theories. We present two independent methods of calculating the coefficients: one from field theory and the other using the mass term in axial anomaly equation. An ambiguity in the integration constant similar to hydrodynamic approach to axial chiral vortical effect exists in the latter, but can be fixed naturally in the presence of mass. We obtain perfect agreement between the methods. The results of axial chiral vortical effect and chiral separation effect indicate that the presence of mass generically suppresses the two coefficients, with less suppression at larger chemical potential. For phenomenologically relevant case of quark gluon plasma with three quark flavor, we find the correction is negligible.

    nucl-thhep-phhep-thPRD(2018)·45 citations
  2. 02

    Predictions of nuclear -decay half-lives with machine learning and their impacts on process

    Z. M. Niu · H. Z. Liang · B. H. Sun · W. H. Long · Y. F. Niu

    Nuclear decay is a key process to understand the origin of heavy elements in the universe, while the accuracy is far from satisfactory for the predictions of -decay half-lives by nuclear models up to date. In this letter, we pave a novel way to accurately predict -decay half-lives with the machine-learning based on the Bayesian neural network, in which the known physics has been explicitly embedded, including the ones described by the Fermi theory of decay, and the dependence of half-lives on pairing correlations and decay energies. The other potential physics, which is not clear or even missing in nuclear models nowadays, will be learned by the Bayesian neural network. The results well reproduce the experimental data with a very high accuracy and further provide reasonable uncertainty evaluations in half-life predictions. These accurate predictions for half-lives with uncertainties are essential for the -process simulations.

    nucl-thastro-ph.SRnucl-exPRC(2019)·128 citations
  3. 03

    Uncertainty quantification in nuclear shell model

    Sota Yoshida · Noritaka Shimizu · Tomoaki Togashi · Takaharu Otsuka

    The uncertainty quantifications of theoretical results are of great importance to make meaningful comparisons of those results with experimental data and to make predictions in experimentally unknown regions. By quantifying uncertainties, one can make more solid statements about, e.g., origins of discrepancy in some quantities between theory and experiment. We propose a novel method for uncertainty quantification for the effective interactions of nuclear shell-model calculations as an example. The effective interaction is specified by a set of parameters, and its probability distribution in the multi-dimensional parameter space is considered. This enables us to quantify the agreement with experimental data in a statistical manner and the resulting confidence intervals show unexpectedly large variations. Moreover, we point out that a large deviation of the confidence interval for the energy in shell-model calculations from the corresponding experimental data can be used as an indicator of some exotic property, e.g. alpha clustering, etc. Other possible applications and impacts are also discussed.

    nucl-thnucl-exPRC(2018)·24 citations
  4. 04

    Wobbling motion in Lu within a semi-classical framework

    A. A. Raduta · R. Poenaru · Al. H. Raduta

    The results obtained for Lu with a semi-classical formalism are presented. Properties like excitation energies for the super-deformed bands TSD1, TSD2, TSD3, in Lu, and TSD1 and TSD2 for Lu, inter- and intra-band B(E2) and B(M1), the mixing ratios, transition quadrupole moments are compared either with the corresponding experimental data or with those obtained for Lu. Also alignments, dynamic moments of inertia, relative energy to a reference energy of a rigid symmetric rotor with an effective moment of inertia and the angle between the angular momenta of the core and odd nucleon were quantitatively studied. One concludes that the semi-classical formalism provides a realistic description of all known wobbling features in Lu.

    nucl-thJ.Phys.G(2018)·13 citations

Affiliations

first authorsco-authorsvia INSPIRE