TY - JOUR
T1 - Impurity effect of the Λ particle on the structure of 18F and Λ19F
AU - Tanimura, Y.
AU - Hagino, K.
AU - Sagawa, H.
PY - 2012/10/23
Y1 - 2012/10/23
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevC.86.044331
DO - 10.1103/PhysRevC.86.044331
M3 - Article
AN - SCOPUS:84867793661
VL - 86
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
SN - 0556-2813
IS - 4
M1 - 044331
ER -