Application of random-phase approximation to vibrational excitations of double-Λ hypernuclei

F. Minato, K. Hagino

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11 Citations (Scopus)

Abstract

Using the Hartree-Fock plus random phase approximation (HF+RPA), we study the impurity effect of Λ hyperon on the collective vibrational excitations of double-Λ hypernuclei. To this end, we employ Skyrme-type ΛN and ΛΛ interactions for the HF calculations, and the residual interactions for the RPA are derived with the same interactions. We find that the inclusion of two Λ hyperons in 16O shifts the collective states toward higher energies. In particular, the energy of the giant monopole resonance of ΛΛ18O, as well as that of ΛΛ210Pb, becomes higher. This implies that the effective incompressibility modulus increases owing to the impurity effect of Λ particles, if the β-stability condition is not imposed.

Original languageEnglish
Article number024316
JournalPhysical Review C - Nuclear Physics
Volume85
Issue number2
DOIs
Publication statusPublished - 2012 Feb 22

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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