Abstract
The investigation of the odd-neutron nucleus235U and odd-proton nucleus237Np provides the possibility to study separately the alignment effects in thei 13/2 proton andj 15/2 neutron intruder states in the actinides. Using Coulomb excitation with208Pb projectiles we were able to extend the yrast bands up to the 57/2 levels in both cases. The experimental results consistently show — at least in the region of the rotational frequencies studied — the dominant role of thei 13/2 proton alignment, as well as the weakness of the interaction strength of thej 15/2 neutrons-configuration forN=144.
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We thank H. Folger, M.S. Moore, M. Mutterer, W. Spreng and J. Theobald for their interest in this work, fruitful discussions and kind support. We gratefully acknowledge the continuous effort of the UNILAC to produce intense and reliable208Pb beams.
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Kulessa, R., DeVito, R.P., Emling, H. et al. High-j proton and neutron alignment in the odd actinides235U and237Np. Z Physik A 312, 135–141 (1983). https://doi.org/10.1007/BF01411671
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DOI: https://doi.org/10.1007/BF01411671