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Institut für Kernphysik, TU Darmstadt K.-H. Speidel Kernstrukturuntersuchungen an radioaktiven Isotopen mit Hilfe von -Transfer-Reaktionen University of.

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Presentation on theme: "Institut für Kernphysik, TU Darmstadt K.-H. Speidel Kernstrukturuntersuchungen an radioaktiven Isotopen mit Hilfe von -Transfer-Reaktionen University of."— Presentation transcript:

1 Institut für Kernphysik, TU Darmstadt K.-H. Speidel Kernstrukturuntersuchungen an radioaktiven Isotopen mit Hilfe von -Transfer-Reaktionen University of Surrey DPG Spring Meeting 2008 Darmstadt J. Leske 1 Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn S. Pietri GSI, Darmstadt P. Doornenbal, J. Gerl, N. Goel, I. Kojouharov, W. Prokopowicz, H. Schaffner, H.-J. Wollersheim University of LUND J. Cederkall, A. Ekstroem FZ Rossendorf R. Schwengner TU München R. Gernhäuser, P. Maier-Komor A. Jungclaus, J. Walker, V. Modamio Universidad Autonoma de Madrid 1 Institut für Kernphysik, TU Darmstadt B. Alikhani, L. Coquard, T. Bloch, N. Pietralla

2 Institut für Kernphysik, TU Darmstadt Kernstrukturuntersuchungen an radioaktiven Isotopen mit -Transfer need for radioactive ion beam facilities Introduction & Motivation exploration of the entire nuclear landscape pn interaction nn force nuclear models RIKEN (Japan) MSU (USA) TRIUMF (Canada) GANIL (France) CERN (Europe) GSI

3 Institut für Kernphysik, TU Darmstadt Kernstrukturuntersuchungen an radioaktiven Isotopen mit -Transfer Transient magnetic fields linear parametrisation with ion beam induced attenuation exp = G beam lin g polarized electrons and aligned nuclear spin excited ion with aligned nuclear spin travels through polarized ferromagnetic environment empirical parametrization required ! stable beam

4 Institut für Kernphysik, TU Darmstadt Kernstrukturuntersuchungen an radioaktiven Isotopen mit -Transfer g-factor measurements using transfer Particle coincidence spectrum Particle- - angular correlation

5 Institut für Kernphysik, TU Darmstadt Kernstrukturuntersuchungen an radioaktiven Isotopen mit -Transfer Particle gated -coincidence spectra two different nuclei studied simultaneously rates comparable those of Coulex experiments transfer selective to low spin states

6 Institut für Kernphysik, TU Darmstadt Kernstrukturuntersuchungen an radioaktiven Isotopen mit -Transfer g factors and B(E2)s from -transfer experiments Ge Zn Ti Ti O. Kenn et al., Phys. Rev. C65 (2002) J. Leske et al., Phys. Rev. C71 (2005) K.-H. Speidel et al., Phys. Lett. B 633 (2006) 219 S. Schielke et al., Phys. Lett. B 567 (2003) 153 T 1/2 = 9.2 h T 1/2 = 271 dT 1/2 = 1.7 mT 1/2 = 60 y Is transfer also applicable for isotopes heavier than A = 68 ?

7 Institut für Kernphysik, TU Darmstadt Kernstrukturuntersuchungen an radioaktiven Isotopen mit -Transfer UNILAC Experiment U234 (see also HK 48.7 from J. Walker) Measurement of the g-factors of 2 + states in stable A=112,114,116 Sn isotopes using the transient field technique recoil detection 20° 45° 4 Euroball Cluster at ±65° 112,114,116 4 MeV/u nat C GdCu mg/cm excitation layer natural carbon 112,114,116 Sn + 12 C 112,114,116 Sn* 116,118,120 Te*

8 Institut für Kernphysik, TU Darmstadt Kernstrukturuntersuchungen an radioaktiven Isotopen mit -Transfer UNILAC Experiment U Te 114 Sn Prompt particle gated -ray spectra 12 C Si spectrum channel counts E (keV) counts 51 o 65 o 79 o e-e+e-e e-e+e-e

9 Institut für Kernphysik, TU Darmstadt Kernstrukturuntersuchungen an radioaktiven Isotopen mit -Transfer spectra E (keV) counts 112 Sn/ 116 Te 114 Sn/ 118 Te 116 Sn/ 120 Te e-e+e-e+ e-e+e-e+ e-e+e-e+

10 Institut für Kernphysik, TU Darmstadt Kernstrukturuntersuchungen an radioaktiven Isotopen mit -Transfer Experimental Result (preliminary) PRELIMINARY g(2 ) factors in 116,118,120 Te + 1 lifetimes from DSAM analysis in 116,118,120 Te P. Raghavan, At. Data Tables 42, 189 (1989)

11 Institut für Kernphysik, TU Darmstadt Kernstrukturuntersuchungen an radioaktiven Isotopen mit -Transfer Summary Beam : Isotope : T 1/2 : 78 Kr 82 Sr Kr 90 Sr Sr 88 Zr Xe 128 Ba Xe 140 Ba Ru 100 Pd d25.5 d28.5 y83.4 d2.4 d12.8 d Transfer to stable Ion Beams (examples) Transfer observed in nuclei beyond A ~ 110 Proof of principle for g-factor and DSAM experiments using transfer to stable nuclei in a mass region between 32 < A < 116 More exotic nuclei by Transfer to radioactive Ion Beams !

12 Institut für Kernphysik, TU Darmstadt Kernstrukturuntersuchungen an radioaktiven Isotopen mit -Transfer Outlook Plunger Experiments Precision lifetime study in the proton-rich 100 Pd following Coulomb-barrier -transfer reactions on 96 Ru Precision lifetime study in the neutron- rich 140 Ba following Coulomb-barrier - transfer reactions on 136 Xe 1 symmetric cluster (prototype) 4 asymmetric cluster 36-fold segmented Ge cristalls 540 segments, 555 channels (digital) photopeak efficiency 3 – 8 % AGATA-Demonstrator (Legnaro) Transient Field & DSAM Experiments UNILAC (GSI), Legnaro, REX-ISOLDE, GANIL


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