Presentation on theme: "Investigation of short-lived nuclei using RIBs"— Presentation transcript:
1 Investigation of short-lived nuclei using RIBs Reiner KrückenPhysik Department E12Technische Universität MünchenMaier-Leibniz-Laboratoriumfür Kern- und Teilchenphysikder Ludwig-Maximilians-Universität Münchenund der Technischen Universität München
4 r-Process abundance for metal poor stars element numberabundance log(X/H)-12CS (Sneden et al. 2003)solar r
5 Nuclei along the r-process K.L. KratzRussbach 2006
6 r-process abundances not well described by current models Pfeiffer et al.Shell quenching or fission or …?G. Martinez Pinedo et al.
7 Modifications of shell structure in neutron-rich nuclei How does the central potential change with neutron excess?What is the isospin dependence of the spin-orbit interaction?Spin-orbit couplingrVrVValley of stabilityNeutron-rich nuclei
8 Lack of predictive power of mean-field models M. Bender, P.H. Heenen, P.G. ReinhardRev. Mod. Phys. 75 (2003) 122from RIA Whitepaper
9 What we can measure in the laboratory? Masses, Q-valuesHalf-lives T1/2Beta-delayed neutron emission probabilities PnEvolution of single-particle structure and collectivity probing of shell structure working towards reliable theoretical modelslow-lying dipole strength important for e.g. (g,n)
10 Production of short-lived radioactive beams Isotope Separation On-LineReaction of light projectile (p, d, n) on a heavy targetSpallationFissionFragmentationExotic nucleus produced in-flightas fragment of heavy beamFragmentationFissionDiffusion out of thick target:depends on chemistrySlow processFragments fly forward with beam velocity (30-90% c)Physical separation only- Fast separation
12 Gesellschaft für Schwerionenforschung (GSI) in Darmstadt Ion sourceTarget AreaTherapyUNILACESRIon source(high Q)FRSExperimental hall8-20% c(3-20 MeV/nucleon)NSISMax. 90% c(2 GeV/nucleon)
13 Production of 100Sn and T1/2 of rp-process nuclei DE124Xe beamE= 1 A.GeVTOFDEFirst production of 100SnTUMT. Faestermann et al., EPJA 15 (2002) 185A. Stolz et al.
14 FAIR: Facility for Antiproton and Ion Research Primary Beams1012/s; GeV/u; 238U28+Factor over present in intensityFuture FacilitySIS 100/300GSI todaySIS 18UNILACESR100 mHESRSuperFRSSecondary BeamsBroad range of radioactive beamsup to GeV/u;up to factor in intensity over presentAntiprotons GeVRESRCRStorage and Cooler RingsRadioactive beamse- - A and Antiproton-A colliderNESR
15 Current experimental program Decay spectroscopy and T1/2:- 100Sn and vicinity (GSI, RIKEN)A~90 Ge,As,Se (ILL Grenoble)128Pd and vicinity (GSI)below 208Pb (GSI)Coulomb REX-ISOLDEN=40-50 Ni, Cu, ZnCd, Xe, Ba around N=82Probing evolution of shell structureknock-out and inelastic excitation:55Ti, 73Cu (GSI)42Si, 54Ca and vicinity (RIKEN)transfer reactions at REX-ISOLDE~ 32Mg, ~ 68Ni
16 Reach of mass- and T1/2 measurements at FAIR Source:ILIMA collaborationOther future facilities:RIKENCERNGANILMSU
17 SummaryProperties of nuclei involved in nucleosynthesis are often not well known experimentallyTheoretical models and extrapolations vary significantly lack of reliable predictionsCurrent and future radioactive beam facilities allow forInvestigation of key nuclei to distinguish between theoretical models towards a unified nuclear theoryDirect measurement of properties of relevant nucleiLocal groups (LS Krücken, LS Habs) involved in experiments and methodical developmentsNew Professorship in Nuclear Astrophysics will strengthen local effort