E2 properties of nuclei far from stability and the proton-halo problem of 8B

Details E2 properties of nuclei far from stability and the proton-halo problem of 8B E2 properties of nuclei far from stability and the proton-halo problem of 8B

1993-11-04

arxiv.org/abs/nucl-th/9311004v1

Physics

Nuclear Physics

Nuclear Theory

(LaTeX, 23 pages)

Scientific paper

10.1103/PhysRevC.49.886

E2 properties of A=6--10 nuclei, including those of nuclei far from stability, are studied by a $(0+2)\hbar\omega$ 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 $^8$B can be understood without introducing the proton-halo in $^8$B. An interesting effect of the $2\hbar\omega$ core-polarization is found for effective charges used in the $0\hbar\omega$ 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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