• Shell structure: ~ 1 MeV • Quantum phase transitions: ~ 100s keV • Collective effects: ~ 100s keV • Interaction filters: ~ 10-15 keV Binding energies, Separation energies: Collectivity, symmetries, quantum phase transitions What is the origin of simple patterns in complex nuclei? What is the origin of simple patterns in complex nuclei? Double differences of masses – Interaction filters: p-n interactions What is the nature of the nuclear force that binds What is the nature of the nuclear force that binds protons and neutrons? protons and neutrons? Macro Micro Mass measurements of n-rich nuclei Collective Structure and the Microscopic Drivers of Structural Evolution
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Collective contributions to masses can vary significantly for small parameter changes in collective models.
Masses: complementary observable to spectroscopic data in pinning down structure.
Particularly important far off stability where data will be sparse
B.E
(M
eV)
Examples of IBA calculations of rare earth nuclei
B.E S2n(Coll.) for two calcs.
S2n(Coll.) for two calcs.
Er Gd
Valence Proton-Neutron Interaction
Development of configuration mixing, collectivity and deformation – competition
with pairing
Changes in single particle energies and magic numbers
Partial history: Goldhaber and de Shalit (1953); Talmi (1962); Federman and Pittel ( late 1970’s); Casten et al (1981); Heyde et al (1980’s); Nazarewicz, Dobacewski et al (1980’s); Otsuka et al( 2000’s) and many others.