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NUCLEAR INP - NCSR D Nuclear Structure Staff: Dennis Bonatsos Students: P. Georgoudis S. Karabatsou Collaborations: N. Minkov, P.A. Terziev, INRNE Sofia D, Balabanski, U. Sofia M.N. Erduran, B. Akkus, Istanbul U. N. Casten, Yale U., N. Pietralla SUNY at Stony Brook Nuclear Reactions & Astrophysics Staff: Vivian Demetriou (since 2006) Post-doctoral researcher: D. Petrellis Collaborations: Nuclear Physics Exp. group S. Goriely, ULB, Brussels Y. El Masri, UCL, LLN Vivian Demetriou, INP, NCSR Demokritos

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NUCLEAR INP - NCSR D Nuclear Structure Conferences/Workshops: International Balkan School on Nuclear Physics, Symposium of the Hellenic Nuclear Physics Society Workshop on Dynamical Symmetries 2008 Nuclear Reactions & Astrophysics Support: European Reintegration Grant (2005) on Alpha-nucleus OP Conferences/Workshops: FINUSTAR (2005), FINUSTAR 2 (2007), FINUSTAR 3 (2010)

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LIBRA project Nuclear structure: study of dynamical symmetries experiment-theory Nuclear Astrophysics development of alpha-particle optical potential alpha-capture measurements theory post-doc position open for 2011

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Collaborations INRNE, Sofia, Bulgaria: N. Minkov, P. A. Terziev. U. Sofia, Bulgaria / U. Camerino, Italy : D. Balabanski. Istanbul U., Turkey: M. N. Erduran, B. Akkus. SUNY at Stony Brook, USA: N. Pietralla Support: Collaborative Linkage Grant (6/2002-6/2004). New dynamic symmetries in atomic nuclei. Istanbul U. (M. N. Erduran), Bogazici U. (M. Arik), U. Sofia (D. Balabanski), NIPNE Bucharest (M. Ionescu-Bujor), NCSR Demokritos (D. Bonatsos), Yale U. (R. F. Casten). Nuclear Structure: CRITICAL POINT SYMMETRIES (2003-present)

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Topics: - Sequences of potentials interpolating between U(5) and E(5) or X(5). - Davidson potentials, variational procedure. - Z(5): Solution of Bohr equation for gamma=30 deg. - Transition to octupole deformation in light actinides. - Wobbling motion within X(5). - Triaxial shapes. - Comparison between Davidson and displaced well potentials. - Derivation of collective models from rotation invariant potentials through Goldstone bosons and the Higgs mechanism. - Search for larger symmetries which could lead to X(5) through contraction.

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Nuclear Reactions & Astrophysics nuclear reactions relevant to heavy-element nucleosynthesis provide cross sections and reaction rates for reaction network calculations (TALYS code) develop global and microscopic models for nuclear properties

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Nuclear needs for nucleosynthesis applications Exotic species (no experimental data) Astrophysics conditions (proj. energy or target conditions not available in the Lab.)

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Ground state mass, deformation, density distribution, single-particle-level scheme, … Nuclear Level Densities Fission properties: fission barriers and saddle-point NLDs Nucleon- and alpha-nucleus optical potential γ-strength function: Giant Resonance Properties Nuclear properties for cross section calculations Nuclear Ingredients from(1) direct experimental data (2) theoretical models …For about 8000 nuclei….from dripline to dripline

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r process: Fission Fission paths microscopic HFB shapes (Hill-Wheeler) and WKB penetrabilities

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uncertainties : B 1 MeV T 10 4 Spontaneous fission T 1/2 n-induced fission β-delayed fission Q PD, Samyn, Goriely, NPA 758 (2005),627c; Goriely, PD et al., NPA 758 (2005), 587c Work in progress: same HFB model for masses, NLDs and fission

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r: ratio of maximum over minimum rates obtained with 14 different sets of nuclear ingredients using MOST Arnould and Goriely, Phys. Rep. 384, 1 (2003) neutron captures proton captures α captures p-process nucleosynthesis: n-, p- and alpha captures

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αlpha radiative-capture rates low-energy cross sections depend on α-nucleus optical model potential poor knowledge of α-nucleus optical potential at energies close to Coulomb barrier optical potential determined from scattering and reaction data data at low energies are SCARCE - Square-well potential + - Woods-Saxon Double-folded real + W-S (semi-microscopic: new global OMP) accuracy reliability

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Semi-microscopic alpha OP (PD, Grama and Goriely NPA 707 (2002) 253) INP Exp. Group measurements predictions

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mass regions with largest uncertainties Work in progress...and Future Update existing semi-microscopic alpha OP on new data Develop fully microscopic alpha OP with RPA in close collaboration with INP Experimental Nuclear Physics group

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target nuclei in (α, ) reactions studied via a 4π summing method

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