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Exotic Shapes and High Spin physics with Intense Stable Beams

Exotic Shapes and High Spin physics with Intense Stable Beams. Shell structure far from spherical magic numbers. Which is the adopted deformation and how it changes with spin and energy ? What are the active orbitals and their correlations ?. How is spin generated ?.

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Exotic Shapes and High Spin physics with Intense Stable Beams

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  1. Exotic Shapes and High Spin physics with Intense Stable Beams

  2. Shell structure far from spherical magic numbers Which is the adopted deformation and how it changes with spin and energy ? What are the active orbitals and their correlations ? How is spin generated ? How much spin can the nucleus sustain ?

  3. Superdeformed world = more than 250 SD rotational bands Octupole vibrations Gyromagnetic factors SD binding energies Triaxial bands + wobbling Particle decay Band termination Large Shell Model calculations

  4. HIGH L A domain rich of new exotic phenomena to be discovered and studied ENERGY GDR Jacobi shape transition fission Rotational damping Chaos Assisted tunneling superdeformation Hyperdeformation Tetrahedral nuclei SPIN

  5. HLHD ExperimentEUROBALL: 64Ni + 64Ni Int.: 1367 Int.: 993 4 x 52 keV • 261 MeV: 52 keV ridge appears Ridge intensity ~5 x 10-5

  6. Search for discrete-line HD spectraEuroball, )E(~ 52 keV A strange feeling of ‘déjà vu’

  7. Triaxiality and Wobbling Experimental results in 163Lu The best ”Wobbler” TSD1 TSD2 TSD3 TSD4 Relative population TSD1: 10% TSD2: 3% TSD3: 1.2% TSD4: 0.9% D.R. Jensen et al., Phys. Rev. Lett. 89 (2002), 142503.

  8. I=0 Looking for Jacoby shape transition Oblate Prolate I=25 spin I=27 I=34

  9. Gates: Time of Flight Residues nuclei (42Ca) Low energy g multiplicity Theory: (Jacoby shape transition) LSD model + Coriolis Splitting A. Maj et al. Nucl. Phys. A731 (2004) 319

  10. High spin states populated in Fusion evaporation reactions 10 11 Ibeam ~ 10 - 10 p/s (5-10 pnA) Limitation: counting rate in the Germanium detectors and/or common acquisition dead-time -4 Fighting to observe VERY WEAK signals… Resolving power ~ 10 Limitation: current arrays

  11. Gamma-ray Detector Development Central Role in Nuclear Physics • Advances in detector technology have resulted in new discoveries. • Innovations have improved detector performance. • Energy resolution • Efficiency • Peak-to-total ratio • Position resolution • Directional information • Polarization • Auxiliary detectors • Tracking is feasible, will provide new opportunities and meet the challenges of new facilities.

  12. high granularity + digital electronics AGATA will be able to handle 10 – 100 times more beam Advanced GAmma Tracking Array Nevt = Np x Nt x s x ed

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