Proton-neutron interactions and the new atomic masses

Cakirli R. , Brenner D., Casten R., Millman E.

PHYSICAL REVIEW LETTERS, vol.94, no.9, 2005 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 94 Issue: 9
  • Publication Date: 2005
  • Doi Number: 10.1103/physrevlett.94.092501
  • Journal Indexes: Science Citation Index Expanded, Scopus


Double differences of masses can be used to isolate specific nucleonic interactions. With the new 2003 mass tabulation a significant increase in the number of empirical average proton-neutron interactions of the last nucleons can be extracted. It is shown that they exhibit dramatic and distinctive patterns, especially near doubly magic nuclei, that these patterns can be interpreted with a simple ansatz based on overlaps of proton and neutron orbits, and that the trends in p-n interactions across entire shells can be understood if they are correlated with the fractional shell filling. It is shown how these empirical interactions can be sensitive to changes in shell structure in exotic nuclei. Finally, these results are used to suggest criteria for future mass measurements with new exotic beam facilities.