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Triaxial Projected Configuration Mixing
1. Collective wave functions?2. Old results on Zr
3. Few results on 24Mg4. Many questions
First triaxial calculations:P. Bonche, H. Flocard, J. MeyerJ. Dobaczewski, J. Skalski
New developments:M. Bender
Configuration MixingStarting point: set of Wa wave functions |a >, non-orthogonal:
New set of wave functions:
The unknown fm( )a are solutions of the HW equation:
The f’s are non orthogonal, ill-behaved, ….
Change of basis, using the overlap matrix, defining its square root:
Very nice but not used directly!
First, diagonalisation of the overlap I:
And then
Last summation restricted to a limited number of eigenvaluesIt is this equation that is solved!
The collective wave function is
And the eigenstates of the Hamiltonian is:
Neither g nor f are the overlap
Meaning of oblate, prolate, triaxial …. after configuration mixing?
Projection of triaxial map:
Triaxial minimum?lost of the meaning of q after projection!no orthogonality of wave functions!
Q=125 fm2, = 16°g(mean-field configuration)
z= longest intermediate smallest axis
Spectra obtained after projection of the lowest configuration:three possible orientations
Same results AFTER K-mixing
Spectroscopic properties of the min configurationbefore and after K-mixingcompared to the Davidoff rotor model
Configuration mixing:
comparison between different bases:
1. purely prolate2. axial3. purely triaxial 4. triaxial + a few prolate configurations
We are not using a hamiltonian but a density functionalgeneralized for non-diagonal matrix elements
One must avoid pathologies:possible problems determined by projecting on N and Zwith 9 and 29 pointsTriaxial region close to the oblate axis.No oblate points mixed with triaxial points.
Small eigenvalues of the norm kernel indicate redundancy in a basis
small eigenvalues (10-2) = not much information
All the GCM calculations: axial (prolate+oblate) purely triaxial (35 keV lower than axial) triaxial + prolate (160 keV lower than triaxial)
Triaxial correlations described by configuration mixing of axial configurations!
Cut in the Q,g plane: and GCM calculations
increase of energy for excited statesdue to the correlations in the ground state!
Spectra in 3 bases
No vectors in common!