Modification of triaxial deformation and change of spectrum in ${}_{\Lambda }^{25}$Mg caused by $\Lambda$ hyperon

Abstract

The positive-parity states of ${}_{\Lambda }^{25}$Mg with a $\Lambda$ hyperon in $s$ orbit were studied with the antisymmetrized molecular dynamics for hypernuclei. We discuss two bands of ${}_{\Lambda }^{25}$Mg corresponding to the $K^{\pi }=0^{+}$ and $2^{+}$ bands of ${}^{24}$Mg. It is found that the energy of the $K^{\pi }=2^{+}\otimes {\Lambda }_s$ band is shifted up by about 200 keV compared to ${}^{24}$Mg. This is because the $\Lambda$ hyperon in $s$ orbit reduces the quadrupole deformation of the $K^{\pi }=0^{+}\otimes {\Lambda }_s$ band, while it does not change the deformation of the $K^{\pi }=2^{+}\otimes {\Lambda }_s$ band significantly.

19 pages, 3 figures

References in corpus (6)

• Baryon-baryon interactions in the SU6 quark model and their applications to light nuclear systems
• Configuration mixing of angular-momentum and particle-number projected triaxial HFB states using the Skyrme energy density functional
• Extended-soft-core Baryon-Baryon Model II. Hyperon-Nucleon Interaction
• Deformation of Lambda hypernuclei
• Deformation of hypernuclei studied with antisymmetirzed molecular dynamics
• Shape of Lambda hypernuclei in (beta,gamma) deformation plane

Cited by in corpus (16)

• Green's function relativistic mean field theory for $\Lambda$ hypernuclei
• Triaxially deformed relativistic point-coupling model for $\Lambda$ hypernuclei: a quantitative analysis of hyperon impurity effect on nuclear collective properties
• Generator coordinate method for hypernuclear spectroscopy with a covariant density functional
• Beyond-mean-field study of the hyperon impurity effect in hypernuclei with shape coexistence
• Clusterization and deformation of multi-$\Lambda$ hypernuclei within relativistic mean-field model
• Disappearance of nuclear deformation in hypernuclei: a perspective from a beyond-mean-field study
• Effects of $\bm\la$ hyperons on the deformations of even-even nuclei
• Collective excitations of $\Lambda$ hypernuclei
• Beyond mean-field approach for pear-shaped hypernuclei
• Low-energy hypernuclear spectra with microscopic particle-rotor model with relativistic point coupling hyperon-nucleon interaction
• Excitation energy shift and size difference of low-energy levels in $p$-shell $\Lambda$ hypernuclei
• The interplay of single-particle and collective motions in the low-lying states of ${}_{\Lambda }^{21}$Ne with quadrupole-octupole correlations
• Impurity effect of Lambda particle on the structure of 18F and 19F_Lambda
• Generator coordinate method for nuclear octupole excitations: status and perspectives
• Sum rule approach to a soft dipole mode in $\Lambda$ hypernuclei
• Reaction cross sections of hypernuclei and the shrinkage effect