Summary
The fermion-fermion, fermion-boson and boson-boson neutron-proton interaction energies of valence nucleons and dinucleons, εp l −n j , εp l −2n j , εn j −2p j , and ε2p l −2n j , are calculated for a great number of 1f 7/2 nuclei. These energies are almost unchanged if every neutron is converted into a proton and vice versa, and are extremely dependent on therank of the partners in the shells, being maximum when the partners have the same rank. A strong enhancement of the various neutron-proton interactions is observed at shell closure and confirms that spin-orbit effects and neutron-proton interaction are closely related. The diproton-dineutron interaction is shown to follow laws similar to those of the fermionic n-p interaction. The extremely energy-rich interaction between diprotons and dineutrons of rank 1 observed in the4He valence shells and even in the 1d 5/2 shell is still observed in the 1f 7/2 shells. Another anomaly, the enhanced n2-p2 interaction energy, observed in the4He valence shells but not in the 1d 5/2 shells, is observed in the 1f 7/2 shells. Recognition of the existence of these anomalies in the4He shells leads to a better understanding of the properties of these valence shells than in a previous approach. Knowledge of the «from core» detachment energies and of the various neutron-proton interaction energies allows a visualization of the energetic structure of many 1f 7/2 nuclei in their ground state.
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Mouze, G., Bidegainberry, S., Rocaboy, A. et al. The neutron-proton interaction energy of the valence nucleons. Nuov Cim A 106, 885–903 (1993). https://doi.org/10.1007/BF02786659
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DOI: https://doi.org/10.1007/BF02786659