Proton dominance in the 2+2 -> 0+1 transition of N = Z 2 nuclei around Si-28
Abstract
E2 transitions in Si-30 are investigated in relation with intrinsic deformations based on a method of antisymmetrized molecular dynamics. By comparing E2 transition strengths in the mirror nuclei Si-30 and S-30, transition matrix amplitudes Mp and Mn for protons and neutrons are discussed in mirror analysis. Particular attention is paid to the Mn/Mp ratio in the transition from the 2+2 state to the 0+1 state. The Mn/Mp ratio in Mg-26 and Si-26 is also investigated. It is found that the proton dominance in the transition 2+2 -> 0+1 in Si-30 and Si-26 originates in the oblate trend of the Z=14 proton structure.
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