Düsseldorf 2007 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 6: Präzisionsmassenspektrometrie und Ionenfallen
MS 6.1: Hauptvortrag
Mittwoch, 21. März 2007, 14:00–14:30, 5F
Proton-Neutron Interactions in Terms of Double Differences of Binding Energies : Relation to New Mass Measurements — •Burcu Cakirli — Nukleer Fizik Anabilim Dali, Istanbul Universitesi
Proton - neutron interactions determine structural evolution with N and Z including the onset of collectivity, deformation, and phase transitions. We have extracted the interaction of the last proton (p) and the last neutron (n), called δ Vpn, from a specific double difference of binding energies using the new mass tabulation [1]. The results are especially revealing for self-conjugate nuclei and in regions of strong shell closures in heavy nuclei. For example in the Pb region, δ Vpn values are interpreted using overlaps of shell model orbits, which are large when both protons and neutrons are in similar orbits, and small when they are not. Moreover, a relation between p-n interactions and growth rates of collectivity in terms of particle-particle (or hole-hole) and particle-hole regions was found. Finally, nuclear masses were calculated using nuclear density functional theory for even-even nuclei over the enrire nuclear chart. δ Vpn values were predicted and showed excellent agreement with the empirical results. Using these calculations in conjunction with empirical δ Vpn values, it was shown that unknown binding energies could be predicted and some anomalies were onserved. They might reflect structural effects or suggest the need for new mass measurements. These topics and related work will be discussed.
This work was supported by the U.S. DOE Grant No. DE-F602-91-ER-40609
[1] A.H. Wapstra et al., Nucl. Phys. A 729, 129 (2003)