TY - JOUR
T1 - Sum rule approach to a soft dipole mode in Λ hypernuclei
AU - Minato, F.
AU - Hagino, K.
PY - 2013/12/2
Y1 - 2013/12/2
N2 - Applying the sum rule approach, we investigate the energy of a soft dipole motion in Λ hypernuclei, which results from a dipole oscillation of a Λ hyperon against the core nucleus. To this end, we systematically study single-Λ hypernuclei, from Λ16O to Λ208Pb, for which the ground-state wave function is obtained in the frame-work of Hartree-Fock method with several Skyrme-type ΛN interactions. Our results indicate that the excitation energy of the soft dipole Λ mode, EsdΛ, decreases as the mass number increases. We find that the excitation energy is well parametrized as EsdΛ=26.6A-1 /3+11.2A-2/3 MeV for the SkM* NN interaction and EsdΛ=21.3A-1/3+22. 6A-2/3 MeV for the SIII NN interaction as a function of mass number A.
AB - Applying the sum rule approach, we investigate the energy of a soft dipole motion in Λ hypernuclei, which results from a dipole oscillation of a Λ hyperon against the core nucleus. To this end, we systematically study single-Λ hypernuclei, from Λ16O to Λ208Pb, for which the ground-state wave function is obtained in the frame-work of Hartree-Fock method with several Skyrme-type ΛN interactions. Our results indicate that the excitation energy of the soft dipole Λ mode, EsdΛ, decreases as the mass number increases. We find that the excitation energy is well parametrized as EsdΛ=26.6A-1 /3+11.2A-2/3 MeV for the SkM* NN interaction and EsdΛ=21.3A-1/3+22. 6A-2/3 MeV for the SIII NN interaction as a function of mass number A.
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U2 - 10.1103/PhysRevC.88.064303
DO - 10.1103/PhysRevC.88.064303
M3 - Article
AN - SCOPUS:84891798097
VL - 88
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
SN - 0556-2813
IS - 6
M1 - 064303
ER -