Collective excitations of Λ hypernuclei

K. Hagino, Jiangming Yao, F. Minato, Z. P. Li, M. Thi Win

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We discuss low-lying collective excitations of Λ hypernuclei using the self-consistent mean-field approaches. We first discuss the deformation properties of Λ hypernuclei in the sd-shell region. Based on the relativistic mean-field (RMF) approach, we show that the oblate deformation for 28Si may disappear when a Λ particle is added to this nucleus. We then discuss the rotational excitations of MgΛ25 using the three-dimensional potential energy surface in the deformation plane obtained with the Skyrme-Hartree-Fock method. The deformation of MgΛ25 is predicted to be slightly reduced due to an addition of a Λ particle. We demonstrate that this leads to a reduction of electromagnetic transition probability, B(E2), in the ground state rotational band. We also present an application of random phase approximation (RPA) to hypernuclei, and show that a new dipole mode, which we call a soft dipole Λ mode, appears in hypernuclei, which can be interpreted as an oscillation of the Λ particle against the core nucleus.

Original languageEnglish
Pages (from-to)151-159
Number of pages9
JournalNuclear Physics A
Volume914
DOIs
Publication statusPublished - 2013 Sep

Keywords

  • Deformation
  • Dipole motion
  • Impurity effect
  • Mean-field models
  • Random phase approximation
  • Rotational excitation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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