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within the complex EXCITED VAMPIR approach

EXOTIC NUCLEAR STRUCTURE PHENOMENA IN MEDIUM MASS NUCLEI. O. RADU 1 , A. PETROVICI 1,2 , K.W. SCHMID 2 , A. FAESSLER 2. 1 Horia Hulubei National Institute for Physics and Nuclear Engineering, Bucharest,Romania 2 Institut f ü r Theoretische Physik, Universit ä t T ü bingen, Germany. within

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within the complex EXCITED VAMPIR approach

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  1. EXOTIC NUCLEAR STRUCTURE PHENOMENA IN MEDIUM MASS NUCLEI O. RADU1, A. PETROVICI1,2, K.W. SCHMID2, A. FAESSLER2 1 Horia Hulubei National Institute for Physics and Nuclear Engineering, Bucharest,Romania 2 Institut für Theoretische Physik, Universität Tübingen, Germany within the complex EXCITED VAMPIR approach

  2. Variational approaches to the nuclear many-body problem using symmetry-projected Hartree-Fock-Bogoliubov configurations General theoretical tools • the model space is defined by a finite set of spherical single particle states • the effective many-body Hamiltonian is represented as a sum of one- and two-body terms • the basic building blocks are HFB vacua, only restricted by time-reversal and axial symmetry • the HFB transformations are essentially complex and allow proton-neutron and parity mixing • the broken symmetries are restored by projection techniques (s = N, Z, I, ) O.Radu – NNPSS, Tallahassee 2007

  3. O.Radu – NNPSS, Tallahassee 2007

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  5. O.Radu – NNPSS, Tallahassee 2007

  6. Variationalprocedures complex Vampir approach O.Radu – NNPSS, Tallahassee 2007

  7. complex Excited Vampir approach O.Radu – NNPSS, Tallahassee 2007

  8. A= 50 – 90 mass region O.Radu – NNPSS, Tallahassee 2007

  9. Nucl. Phys. A770 (2006) 107 J. Phys. G: Nucl.Part.Phys.32(2006) 583 Shape coexistence effects in 78Kr O.Radu – NNPSS, Tallahassee 2007

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  12. xp Q(2+1)= -61(3) efm2 Q(2+2)= +44(6) efm2 O.Radu – NNPSS, Tallahassee 2007

  13. O.Radu – NNPSS, Tallahassee 2007

  14. Exp. g(2+1)=0.43(3) g(2+2)=0.54(10) g(4+1)=0.46(7) small effective g-factors at spins 8+, 10+, 12+ O.Radu – NNPSS, Tallahassee 2007

  15. 2exp(E0;0+2 0+1)=0.047(13) ; 2EXV(E0;0+3 0+1)=0.017 O.Radu – NNPSS, Tallahassee 2007

  16. Eur. Phys. J. A28 (2006) 19 Magnetic bands in 82Rb O.Radu – NNPSS, Tallahassee 2007

  17. O.Radu – NNPSS, Tallahassee 2007

  18. O.Radu – NNPSS, Tallahassee 2007

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  21. Summary and outlook • the shape coexistence and the variable oblate-prolate mixing with increasing spin and excitation energy could explain the irregularities observed at low, intermediate and high spins • the forking observed at the highest identified spins is determined by a high density of strongly mixed configurations • the calculated electromagnetic properties agree with the available data • an alternative mechanism to the shears bands able to describe microscopically the phenomenon in the A~80 mass region is provided • the experimental trend is produced by an increased mixing of differently deformed • states at the highest calculated spins • the description of the exotic phenomena in medium mass nuclei requires very large many-nucleon model spaces • considerable effort has to be devoted deriving improved effective interaction O.Radu – NNPSS, Tallahassee 2007

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