Comparative nuclear analysis reveals identical yrast and yrare energy patterns up to 5 MeV across valence mirror nuclei, suggesting symmetry preservation across closed proton and neutron shells.
A comparison of examples of 'valence mirror nuclei' (nuclei of the type N=82, Z=60+k and N=60+k, Z=50) 142 Nd ( 144 Sm) and 110 Sn ( 112 Sn) reveals a remarkable similarity of the level energies of the yrast and yrare states. This is valid for states up to an energy of 5 MeV which have an unbroken magic core for the other kinds of particle.
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Wirowski et al. (1988) studied this question.
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