Impurity effect of the Λ particle on the structure of 18F and Λ19F

Y. Tanimura, K. Hagino, H. Sagawa

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7 Citations (Scopus)


We perform three-body model calculations for a sd-shell hypernucleus Λ19F (Λ17O+p+n) and its core nucleus 18F (16O+p+n), employing a density-dependent contact interaction between the valence proton and neutron. We find that the B(E2) value from the first excited state (with spin and parity of Iπ=3+) to the ground state (Iπ=1+) is slightly changed by the addition of a Λ particle, which exhibits the so called shrinkage effect of Λ particle. We also show that the excitation energy of the 3+ state is reduced in Λ19F compared to 18F, as is observed in a p-shell nucleus 6Li. We discuss the mechanism of this reduction of the excitation energy, pointing out that it is caused by a different mechanism from that in Λ7Li.

Original languageEnglish
Article number044331
JournalPhysical Review C - Nuclear Physics
Issue number4
Publication statusPublished - 2012 Oct 23

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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