Coulomb Excitation of Neutron-rich

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Presentation transcript:

Coulomb Excitation of Neutron-rich Xe-Isotopes @REX-ISOLDE REX-ISOLDE ist eine Facility für radioaktive Strahlen am CERN Thomas Behrens Physik-Department E12 TU München

Gliederung Physical motivation: Evolution of B(E2) values around N=82 Experimental setup and realisation at REX-ISOLDE (CERN) with MINIBALL Preliminary results with 138,140Xe Conclusion & Outlook

B(E2) values around N=82 122,124Cd 140Xe B(E2; 0+g2+) (e2b2) preliminary results: 122Cd: 0.37(11) 124Cd: 0.32(10) Motivation Te l l Cd l 140Xe Setup B(E2; 0+g2+) (e2b2) l l Results D. Radford et al., PRL 88, 222501 (2002) INPC 2004, ENAM ‘04 l Modifizierter Plot von Dave Radford Momentaner Stand der bekannten B(E2) Werte l l Outlook Neutron Number 136Te

Coulomb Excitation • Beam energy below Coulomb barrier a“Safe Coulex” • h = Z1Z2e2/ħn >> 1 • bproj ~ 0.06 c (aDoppler correction) b Target Z Projectile Motivation Setup i f Results Wir messen das Gamma aus der Abregung f -> i Outlook

Experimental Setup Gamma- spectroscopy Particles Angles Energies Beam MINIBALL Particles Angles Energies DSSSD Univ. of Edinburgh Beam monitor PPAC TU Darmstadt Beam purity Beam Dump Detector Motivation g Setup Beam Target Results DE-E Protons on converter target Mk7 ion source 2.86 MeV/A from REX no contamination Outlook

CD energy vs angle Motivation 96Mo Setup 140Xe Results Outlook

IS411 – 140Xe on 96Mo Eg : Eg>0 & ECD>0 Eg [keV] Motivation Setup 140Ba 140Xe 140Cs Results Outlook Eg [keV]

IS411 – 138Xe peak Motivation 138Xe Setup 96Mo Results Outlook

IS411 – 96Mo peak Motivation 96Mo 138Xe Setup Results Outlook

IS411 – 140Xe peak Motivation 140Xe Setup Results 96Mo Outlook

IS411 – 96Mo peak Motivation 140Xe Setup 96Mo Results Outlook

IS411 – Intensity on CD Motivation Setup Results Outlook

Conclusions & Outlook successful measurement of 138,140,142Xe Motivation successful measurement of 138,140,142Xe with good statistics open tasks: - analysis of 142Xe detector positions Setup planned runs: 126Cd, 144Xe (approved) Results proposed: development of BaF+ beams for heavy Ba isotopes Outlook

Future Experiments Ba isotopes Mass Number Motivation 148,150Ba Setup Results dashed line: theory solid line: Grodzins rule Outlook Mass Number

Helping hands and heads... T. Behrens1, V. Bildstein1, R. Gernhäuser1, Th. Kröll1, R. Krücken1, P. Maierbeck1, D. Habs2, R. Lutter2, T. Morgan2, P. Thirolf2, O. Niedermaier3, H. Scheit3, D. Schwalm3, N. Warr4, D. Weisshaar4, O. Ivanov5, I. Stefanescu5, P. van Duppen5, J. van de Walle5, P.E. Kent6, A. Ekström7, J. Cederkall8, P. Delahaye8, L. Fraile8, U. Köster8, T. Sieber8, F. Wenander8, P. Butler9, A. Hurst9, T. Davinson10, J. Iwanicki11, G. Georgiev12, A. Scherillo13 and the REX-MINIBALL collaboration 1TU München, 2LMU München, 3MPI-K Heidelberg, 4Universität zu Köln, 5KU Leuven, 6University of York, 7Lund University,8CERN, 9University of Liverpool, 10University of Edinburgh, 11Warsaw University, 12IPN Orsay, 13ILL Grenoble Thank you for your attention!

Experimental Setup Gamma spectroscopy Particles Angles Energies Beam MINIBALL Particles Angles Energies DSSSD Beam monitor PPAC Beam purity Beam Dump Detector g g Beam Neue IC wird an unserem Institut entwickelt. DE-E IC - Si Telescope Thomas Behrens

REX-ISOLDE @ CERN Targets MINIBALL NEW: 3 MeV/A ISOLDE Thomas Behrens 5 10 m Thomas Behrens