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Accueil > Séminaires > Séminaires passés > Séminaires de 2008 > Where are all the Phonons gone ? The Double Vacuum, Phonon-less Nuclei and the Demise of the Bohr Hamiltonian

John Sharpey-Schafer

Where are all the Phonons gone ? The Double Vacuum, Phonon-less Nuclei and the Demise of the Bohr Hamiltonian

Le 16 octobre 2008, à 16h15

It has recently become clear [1] that the first excited 0+ states in the N = 90 and N = 88 nuclei are not β-vibrational excitations but are rather a "second vacuum" state in the style of the "pairing isomers" described by Ragnarsson and Broglia. This second vacuum │02+ > has γ and octupole vibrations built upon it in the same manner as the ground state vacuum │01+ >. There is no sign of β-vibrations, which must be above 1.5MeV in excitation energy near the particle-hole excitations of │01+ >.

This is very bad news for both the compilers of nuclear data, the writers of textbooks and for the authors of the flurry of publications during the last decade basing their interpretation of the structure of the rare-earth transitional nuclei on the Bohr Hamiltonian.

The relevant data on Gd and Sm nuclei will be presented and the consequences for current theories of the structure of the Transitional Rare Earth nuclei will be discussed.

[1] J F Sharpey-Schafer, S M Mullins, R A Bark, E Gueorguieva, J Kau, F Komati, J J Lawrie, P Maine, S H T Murray, N J Ncapayi and P Vymers ; submitted to PRL
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