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Motivation Theoretical predictions Experimental requirements and setup

Outline. Motivation Theoretical predictions Experimental requirements and setup Results vs. RPA calculations Summary and outlook. Exotic Nuclides. Nucleosynthesis of 138 La. s-process. r-process. p-process. Production through Neutrino Process.

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Motivation Theoretical predictions Experimental requirements and setup

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  1. Outline • Motivation • Theoretical predictions • Experimental requirements and setup • Results vs. RPA calculations • Summary and outlook

  2. Exotic Nuclides

  3. Nucleosynthesis of 138La s-process r-process p-process

  4. Production through Neutrino Process • Neutral current reactions: 139La(n,n‘n)138La • 181Ta(n,n‘n)180Ta • Charged current reactions: 138Ba(ne,e-)138La • 180Hf(ne,e-)180Ta • Complete stellar evolution in massive stars with the • improved RPA calculations for n-nucleus reactions A. Heger et al., Phys. Lett. B 606 (2005) 258

  5. Different Production Processes of 138La • 138La: pure n process nucleus • 180Ta: 50% p process, 50% n process (s process also not excluded)

  6. Prediction • Low neutrino energies small q Dl = 0 GT strength • RPA predicts main GT resonance well above neutron threshold

  7. Experimental Requirements • (ne,e) Gamow-Teller strength (p,n) or (3He,t) • Gamow-Teller part Narrow angle cut around 0° • Simple one step reaction mechanism • Intermediate energies

  8. Experimental Facility at RCNP

  9. Grand Raiden

  10. 138La Spectrum • Target: 138BaCO4 embedded in polyvinylalcohol

  11. B(GT) extraction

  12. GT Strength Distribution in 138La

  13. Comparison Experiment/RPA • B(GT–)exp» 64% B(GT–)th at 7.47 MeV

  14. 180Ta Spectrum • Target: 180TaO2 embedded in polyvinylalcohol

  15. GT Strength Distribution in 180Ta

  16. Summary and Outlook • Analysis of 138La and 180Ta data completed • Good agreement found for 138La • Comparison with the theory for 180Ta underway • Integration into network calculations underway

  17. PVA Spectrum

  18. Nucleon-Nucleon Interaction: Ein Dependence at q = 0

  19. Production of 180Ta

  20. R2 Value

  21. High Resolution WS Course

  22. Conversion to B(GT)

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