Reduced matrix elements of M2 and E3 γ-transitions between single-quasiparticle states in Sb isotopes and electromagnetic core polarization effects

Abstract

Abstract Reduced M2 and E3 transition matrix elements were obtained for the single-quasiproton transitions of 1 h 11 2 → 1 g 7 2 and 1 h 11 2 → 2 d 5 2 in 115Sb and 117 Sb. The effective M2 and E3 coupling constants are found to be geff(M2)/gfree(M2) = 0.24±0.02 and geff(E3)/gfree(E3)/gfree(E3) ≈ 2.5, respectively, for both 115Sb and 117Sb. They were explained in terms of the spin-isospin core polarization and the octupole core polarization, respectively. The isoscalar and isovector M2 polarizations are discussed by comparing the present geff(M2) of the single-proton transitions with those of the similar single-neutron transitions in Sn isotopes.