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Transfer induced by core excitation within an extended distorted-wave Born approximation method

M. Gómez-Ramos, A. M. Moro, J. Gómez-Camacho, and I. J. Thompson
Phys. Rev. C 92, 014613 – Published 13 July 2015

Abstract

Background: Dynamic core-excitation effects have been found to be of importance in breakup reactions and may be of relevance when obtaining spectroscopic information from transfer reactions.

Purpose: In this paper we extend the distorted-wave Born approximation (DWBA) formalism in order to allow for noncentral components in the core-core term appearing in the transition operator, which allows for dynamic core-excitation effects. Then we study these effects by applying the formalism to different (d,p) reactions.

Methods: The expression of the nonlocal kernels required for the evaluation of the DWBA amplitudes has been extended so as to include noncentral parts in the core-core interaction. The DWBA scattering amplitude is then obtained by solving the corresponding inhomogeneous equation, with the new computed kernels, and the usual outgoing boundary conditions. A new DWBA code has been developed for this purpose.

Results: For Be10(d,p)Be11, core-excitation effects are found to be almost negligible (<3%). The importance of this effect has been found to depend to a large extent on the excitation energy of the core. This has been confirmed in the Ne30(d,p)Ne31 case, for which the excitation energy of the first 2+ state is 0.8 MeV, and the effect of core excitation increases to 10%.

Conclusions: We find dynamic core-excitation effects in transfer reactions to have small contributions to cross sections, in general. However, they should not be neglected, since they may modify the spectroscopic information obtained from these reactions and may become of importance in reactions with nuclei with a core with high deformation and low excitation energy.

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  • Received 17 February 2015
  • Revised 11 May 2015

DOI:https://doi.org/10.1103/PhysRevC.92.014613

©2015 American Physical Society

Authors & Affiliations

M. Gómez-Ramos* and A. M. Moro

  • Departamento de FAMN, Facultad de Física, Universidad de Sevilla, Apdo. 1065, E-41080 Sevilla, Spain

J. Gómez-Camacho

  • Departamento de FAMN, Facultad de Física, Universidad de Sevilla, Apdo. 1065, E-41080 Sevilla, Spain and Centro Nacional de Aceleradores, Avda. Thomas A. Edison, E-41092, Sevilla, Spain

I. J. Thompson§

  • Lawrence Livermore National Laboratory, L-414, Livermore, California 94551, USA

  • *mgomez40@us.es
  • moro@us.es
  • gomez@us.es
  • §thompson97@llnl.gov

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Issue

Vol. 92, Iss. 1 — July 2015

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