Title of article :
Collective excitations of Λ hypernuclei
Author/Authors :
K. Hagino، نويسنده , , J.M. Yao، نويسنده , , F. Minato، نويسنده , , Z.P. Li، نويسنده , , M. Thi Win، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2013
Pages :
9
From page :
151
To page :
159
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 image using the three-dimensional potential energy surface in the deformation plane obtained with the Skyrme–Hartree–Fock method. The deformation of image 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, image, 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.
Keywords :
Rotational excitation , Mean-field models , random phase approximation , Dipole motion , Impurity effect , Deformation
Journal title :
Nuclear physics A
Serial Year :
2013
Journal title :
Nuclear physics A
Record number :
1204396
Link To Document :
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