Nuclear physics input to astrophysics: e.g.  Nuclear structure: Masses, decay half lives, level properties, GT strengths, shell closures etc.  Reaction.

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Presentation transcript:

Nuclear physics input to astrophysics: e.g.  Nuclear structure: Masses, decay half lives, level properties, GT strengths, shell closures etc.  Reaction rates for capture reactions  Isospin and density dependence of the nuclear equation of state Klaus Sümmerer, GSI Darmstadt The perspectives of nuclear astrophysics at fragmentation facilities Contributions from fragmentation-type facilities: 1.Spectroscopy of stopped fragments 2.Unique storage-ring experiments 3.Break-up reactions of unstable nuclei

1.Experiments with stopped fragments:  Combines production/separation at high energy with experiments at low energy  High energy  thick degrader  high isotopic purity  Complementary to ISOL:  Access to refractory elements not available from ISOL  Access to very short half lives  Future (GSI/RIA): Access to N=126 r-process waiting-point nuclei and fissile nuclei below 238 U Nuclear-structure information from fragmentation facilities

Super- FRS: low- energy branch

Predicted production rates at Super-FRS

Storage-ring experiments Mass/half life measurements at storage rings:  Mass measurements over large areas of the nuclear chart  Resolution of isomers  Access to very short half lives (TOF method)  Half life measurements for ionized species (e.g. BBD) Scattering and transfer reactions at internal target:  (p,n) to measure GT strengths  ( ,  ’) to measure giant monopole resonance (  EOS of asymmetric nuclear matter)

Super- FRS: Ring branch Short half lives, stochastic cooling Long half lives, electron cooling, nuclear reactions H.Weick, H.Simon et al.  Mass and half life measurements  Scattering and transfer  Electron scattering

GMR excitations in ( ,  ’) reactions:  measure near  cm =0 degree  E   1 MeV  possible only in storage ring!  wide range of A/Z  E.g Sn Excitation of Giant Monopole Resonances to determine the nuclear compressibility of asymmetric nuclear matter E/A=400 MeV, He atoms/cm 2

Advantages of inverse measurements:  Access to short-lived species  Thick targets  access to rare species  Coincident detection of fast particles  low background Reaction-rate measurements at fragmentation facilities Disadvantages of inverse measurements:  Connects only ground states  Different sensitivity to multipolarities  Small Q-values Recent examples:  7 Be(p,  ) 8 B (GSI)  8 B(p,  ) 9 C (RIKEN)  14 C(n,  ) 15 C (GSI) Measure rad.capture reaction (p/n,  ) via Coul.diss. ( ,p/n)