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Structure and decay of the pygmy dipole resonance in Ne26

M. Kimura*

  • Department of Physics, Hokkaido University, Sapporo 060-0810, Japan and Nuclear Reaction Data Centre, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan

  • *masaaki@nucl.sci.hokudai.ac.jp
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Phys. Rev. C 95, 034331 – Published 31 March, 2017

DOI: https://doi.org/10.1103/PhysRevC.95.034331

Abstract

The low-lying spectra of Ne24,25,26 and the structure of the pygmy dipole resonance (PDR) in Ne26 have been theoretically studied by the antisymmetrized molecular dynamics (AMD) and its extended version called shifted-basis AMD. The calculated energy and strength of the PDR reasonably agree with the observation, and the analysis of the wave function shows that the PDR is dominated by neutron excitation coupled to the quadrupole excited core nucleus Ne25, which explains the observed unexpected decay of PDR to the excited states of Ne25. The large isoscalar component of PDR is also shown and the enhancement of the core excitation in neutron-rich Ne isotopes is conjectured.

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Outline

Information

Phys. Rev. C 95, 034331– Published 31 March, 2017
  • Received 27 November 2016
  • Revised 4 February 2017

©2017 American Physical Society

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