Dynamical coupling of pygmy and giant resonances in relativistic Coulomb excitation

Brady, N. S.; Aumann, T.; Bertulani, C. A.; Thomas, J. O.

doi:10.1016/j.physletb.2016.04.038

Title: Dynamical coupling of pygmy and giant resonances in relativistic Coulomb excitation

Abstract

We study the Coulomb excitation of pygmy dipole resonances (PDR) in heavy ion reactions at 100 MeV/nucleon and above. The reactions Ni-68 + Au-197 and Ni-68 + Pb-208 are taken as practical examples. Our goal is to address the question of the influence of giant resonances on the PDR as the dynamics of the collision evolves. We show that the coupling to the giant resonances affects considerably the excitation probabilities of the PDR, a result that indicates the need of an improved theoretical treatment of the reaction dynamics at these bombarding energies. (C) 2016 The Authors. Published by Elsevier B.V.

Authors:: Brady, N. S.; Aumann, T.; Bertulani, C. A.; Thomas, J. O.

Publication Date:: Wed Jun 01 00:00:00 EDT 2016

Research Org.:: Texas A & M Univ., Commerce, TX (United States)

Sponsoring Org.:: USDOE; National Science Foundation (NSF); GSI Darmstadt; German Federal Ministry of Education and Research (BMBF)

OSTI Identifier:: 1250051

Alternate Identifier(s):: OSTI ID: 1280798

Grant/Contract Number:: FG02-08ER41533; 1415656

Resource Type:: Published Article

Journal Name:: Physics Letters B

Additional Journal Information:: Journal Name: Physics Letters B Journal Volume: 757 Journal Issue: C; Journal ID: ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: Netherlands

Language:: English

Subject:: 74 ATOMIC AND MOLECULAR PHYSICS; heavy-ion collisions; neutron-rich nuclei; strength function; dipole strength; isotopes; width; li-11

Citation Formats


                    Brady, N. S., Aumann, T., Bertulani, C. A., and Thomas, J. O. Dynamical coupling of pygmy and giant resonances in relativistic Coulomb excitation.  Netherlands: N. p., 2016. 
Web.  doi:10.1016/j.physletb.2016.04.038.

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                    Brady, N. S., Aumann, T., Bertulani, C. A., & Thomas, J. O. Dynamical coupling of pygmy and giant resonances in relativistic Coulomb excitation.  Netherlands.  https://doi.org/10.1016/j.physletb.2016.04.038

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                    Brady, N. S., Aumann, T., Bertulani, C. A., and Thomas, J. O. Wed .  
"Dynamical coupling of pygmy and giant resonances in relativistic Coulomb excitation".  Netherlands.  https://doi.org/10.1016/j.physletb.2016.04.038.

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@article{osti_1250051,

  title        = {Dynamical coupling of pygmy and giant resonances in relativistic Coulomb excitation},

  author       = {Brady, N. S. and Aumann, T. and Bertulani, C. A. and Thomas, J. O.},

  abstractNote = {We study the Coulomb excitation of pygmy dipole resonances (PDR) in heavy ion reactions at 100 MeV/nucleon and above. The reactions Ni-68 + Au-197 and Ni-68 + Pb-208 are taken as practical examples. Our goal is to address the question of the influence of giant resonances on the PDR as the dynamics of the collision evolves. We show that the coupling to the giant resonances affects considerably the excitation probabilities of the PDR, a result that indicates the need of an improved theoretical treatment of the reaction dynamics at these bombarding energies. (C) 2016 The Authors. Published by Elsevier B.V.},

  doi          = {10.1016/j.physletb.2016.04.038},

  journal      = {Physics Letters B},

  number       = C,

  volume       = 757,

  place        = {Netherlands},

  year         = {Wed Jun 01 00:00:00 EDT 2016},

  month        = {Wed Jun 01 00:00:00 EDT 2016}

}

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Fig. 1: Strength function for the E1 RPA response in ⁶⁸Ni calculated with formalism described in Ref. [21]. The calculation is performed for several Skyrme interactions, shown in the figure inset. The arrow shows the location of the pygmy resonance. (For interpretation of the references to color in this figuremore »

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