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Nuclear Theory·nucl-th

Monday·October 17, 2016

9 papers—2 primary·7 cross-listed

All9Primary2Cross-lists7
  1. 01

    Simplified P Equations for Nonclassical Transport with Isotropic Scattering

    R. Vasques · R.N. Slaybaugh

    An asymptotic analysis is used to derive a set of diffusion approximations to the nonclassical transport equation with isotropic scattering. These approximations are shown to reduce to the simplified P equations under the assumption of classical transport, and therefore are labeled nonclassical SP equations. In addition, the nonclassical SP equations can be manipulated into a classical form with modified parameters, which can be implemented in existing SP codes. Numerical results are presented for an one-dimensional random periodic system, validating the theoretical predictions.

    nucl-thmath-phmath.MP0 citations
  2. 02

    Role of core excitation in (d,p) transfer reactions

    A. Deltuva · A. Ross · E. Norvaišas · F. M. Nunes

    [Background:] Recent work found that core excitation can be important in extracting structure information from (d,p) reactions. [Purpose:] Our objective is to systematically explore the role of core excitation in (d,p) reactions, and understand the origin of the dynamical effects. [Method:] Based on the particle-rotor model of Be, we generate a number of models with a range of separation energies ( MeV), while maintaining a significant core excited component. We then apply the latest extension of the momentum-space based Faddeev method, including dynamical core excitation in the reaction mechanism to all orders, to the Be(d,p)Be like reactions, and study the excitation effects for beam energies from MeV. [Results:] We study the resulting angular distributions and the differences between the spectroscopic factor that would be extracted from the cross sections, when including dynamical core excitation in the reaction, to that of the original structure model. We also explore how different partial waves affect the final cross section. [Conclusions:] Our results show a strong beam energy dependence of the extracted spectroscopic factors that become smaller for intermediate beam energies. This dependence increases for loosely bound systems.

    nucl-thnucl-exPRC(2016)·22 citations

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first authorsco-authorsvia INSPIRE