DPG Spring Meeting 2008 Darmstadt

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Presentation transcript:

DPG Spring Meeting 2008 Darmstadt Kernstrukturuntersuchungen an radioaktiven Isotopen mit Hilfe von a-Transfer-Reaktionen J. Leske1 B. Alikhani, L. Coquard, T. Bloch, N. Pietralla 1Institut für Kernphysik, TU Darmstadt A. Jungclaus, J. Walker, V. Modamio Universidad Autonoma de Madrid K.-H. Speidel Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn S. Pietri University of Surrey P. Doornenbal, J. Gerl, N. Goel, I. Kojouharov, W. Prokopowicz, H. Schaffner, H.-J. Wollersheim GSI, Darmstadt J. Cederkall, A. Ekstroem University of LUND R. Schwengner FZ Rossendorf R. Gernhäuser, P. Maier-Komor TU München Institut für Kernphysik, TU Darmstadt

Introduction & Motivation Kernstrukturuntersuchungen an radioaktiven Isotopen mit a-Transfer Introduction & Motivation RIBF @ RIKEN (Japan) RISING @ GSI exploration of the entire nuclear landscape REX-ILSOLDE @ CERN (Europe) pn interaction NSCL @ MSU (USA) need for radioactive ion beam facilities nn force ISAC @ TRIUMF (Canada) nuclear models SPIRAL2 @ GANIL (France) Institut für Kernphysik, TU Darmstadt

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

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

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

g factors and B(E2)‘s from a-transfer experiments Kernstrukturuntersuchungen an radioaktiven Isotopen mit a-Transfer g factors and B(E2)‘s from a-transfer experiments Ti 44 22 Ti 52 22 30 Zn 62 30 32 Ge 68 32 36 T1/2 = 60 y T1/2 = 1.7 m T1/2 = 9.2 h T1/2 = 271 d S. Schielke et al., Phys. Lett. B 567 (2003) 153 K.-H. Speidel et al., Phys. Lett. B 633 (2006) 219 O. Kenn et al., Phys. Rev. C65 (2002) 034308 J. Leske et al., Phys. Rev. C71 (2005) 044316 Is a transfer also applicable for isotopes heavier than A = 68 ? Institut für Kernphysik, TU Darmstadt

Kernstrukturuntersuchungen an radioaktiven Isotopen mit a-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” 4 Euroball Cluster at ±65° natC excitation layer natural carbon Gd Cu 112,114,116Sn* 112,114,116Sn + 12C 0.7 10.8 4.9 116,118,120Te* mg/cm2 recoil detection 20°    45° 112,114,116Sn @ 4 MeV/u Institut für Kernphysik, TU Darmstadt

114Sn 118Te 12C a counts E (keV) Prompt particle gated -ray spectra Kernstrukturuntersuchungen an radioaktiven Isotopen mit a-Transfer UNILAC Experiment U234 Prompt particle gated -ray spectra 114Sn 51o 4+ → 2+ 2+ → 0+ 65o 79o 5- → 4+ 3- → 2+ e-e+ counts 118Te 2+ → 0+ 4+ → 2+ Si spectrum 12C 22+ → 2+ e-e+ 6+ → 4+ counts a E (keV) channel Institut für Kernphysik, TU Darmstadt

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

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

a Transfer to radioactive Ion Beams ! Kernstrukturuntersuchungen an radioaktiven Isotopen mit a-Transfer Summary a Transfer observed in nuclei beyond A ~ 110 Proof of principle for g-factor and DSAM experiments using a transfer to stable nuclei in a mass region between 32 < A < 116 a Transfer to stable Ion Beams (examples) Beam : 78Kr 86Kr 84Sr 96Ru 124Xe 136Xe Isotope : 82Sr44 90Sr52 88Zr48 100Pd54 128Ba72 140Ba84 T1/2 : 25.5 d 28.5 y 83.4 d 3.6 d 2.4 d 12.8 d More exotic nuclei by a Transfer to radioactive Ion Beams ! Institut für Kernphysik, TU Darmstadt

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