E2 properties of nuclei far from stability and the proton-halo problem of 8B
Hitoshi Nakada, Takaharu Otsuka
Abstract
E2 properties of A=6--10 nuclei, including those of nuclei far from stability, are studied by a (0+2)ω shell-model calculation which includes E2 core-polarization effects explicitly. The quadrupole moments and the E2 transition strengths in A=6--10 nuclei are described quite well by the present calculation. This result indicates that the relatively large value of the quadrupole moment of 8B can be understood without introducing the proton-halo in 8B. An interesting effect of the 2ω core-polarization is found for effective charges used in the 0ω shell model; although isoscalar effective-charges are almost constant as a function of nucleus, appreciable variations are needed for isovector effective-charges which play important roles in nuclei with high isospin-values.
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