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Evolution of nuclear shape in the light Radon isotopes. Andrew Robinson , David Jenkins, Stewart Martin- Haugh University of York Jarno Van De Walle CERN Panu Rahkila University of Jyvaskyla Andrei Andreyev, Nick Bree IKS K.U. Leuven

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Evolution of nuclear shape in the light Radon isotopes


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    1. Evolution of nuclear shape in the light Radon isotopes Andrew Robinson, David Jenkins, Stewart Martin-Haugh University of York Jarno Van De Walle CERN PanuRahkila University of Jyvaskyla Andrei Andreyev, Nick Bree IKS K.U. Leuven Peter Butler, TuomasGrahn, JannePakarin, Andrew Petts, Marcus Scheck University of Liverpool Douglas Dijulio, Andreas Ekstrom Lund Univesity Alick Deacon, Sean Freeman University of Manchester Micheal Hass, Vivek Kumar, Kuljeet Singh Weizmann Institute of Science BaharakHadinia, RiccardoOrlandi, John Smith University of the West of Scotland The Miniball Collaboration

    2. Shape Coexistence Atomic nucleus minimises its energy by adopting different deformed mean-field shapes. A. Andreyevet al.,Nature 405, 430 (2000) Andrew Robinson– ISOLDE Workshop: 18th November 2008

    3. Light Pb isotopes Andrew Robinson– ISOLDE Workshop: 18th November 2008

    4. [fm] Coulomb Excitation (Coulex) d • Probe collectivity in nucleus. • Extraction of electromagnetic matrix elements –B(E2). • Sensitive to the sign of spectroscopic quadrupole moment. • Multi-step excitations. • Preferentially excites states which are strongly coupled to the ground state. Excitation of both Projectile and Target particle Andrew Robinson– ISOLDE Workshop: 18th November 2008

    5. Coulex with radioactive beams Coulex with radioactive beams is a highly successful method for establishing the evolution of nuclear shape 74,76Kr at SPIRAL E. Clement et al., PRC 75, 054313 (2007) 70Seat REX-ISOLDE A.M. Hurst et al., PRL 98, 072501 (2007) Andrew Robinson– ISOLDE Workshop: 18th November 2008

    6. Mercury Isotopes IS425 Andrew Petts – Next Talk ! Andrew Robinson– ISOLDE Workshop: 18th November 2008

    7. Light Polonium Isotopes Andrew Robinson– ISOLDE Workshop: 18th November 2008

    8. Radon Isotopes Radon Macroscopic-microscopic models predict that deformed ground states exist beyond 202Rn. E(4+)/E(2+) ratio for 198,200,202Rn typical of an anharmonic vibrational system. S.J. Freeman et al., PRC 50 R1754 (1994) R.B.E. Taylor et al., PRC 54, 2926 (1996); PRC 59, 673 (1999) Polonium Evidence found for deformed intruder states in 202,204Rn which coexist with spherical ground state. D.J. Dobson et al., PRC 66 064321 (2002) Andrew Robinson– ISOLDE Workshop: 18th November 2008

    9. Low Lying Levels in Rn Isotopes Andrew Robinson– ISOLDE Workshop: 18th November 2008

    10. Radon Production Noble gas – easily purified using Plasma cooled transfer line. PS Booster and ThC target: 202Rn - 9 x 105 ions/C 204Rn - 2 x 107 ions/C Intensity at Miniball: 202Rn – 3 x104 ions / s 204Rn– 2 x 105 ions / s Andrew Robinson– ISOLDE Workshop: 18th November 2008

    11. x8 Miniball clusters CD detector (16o-53o) 202,204Rn from REX-ISOLDE 120Sn 2 mgcm-2 Experimental Technique Andrew Robinson– ISOLDE Workshop: 18th November 2008

    12. Preliminary Results: 204Rn 204Rn + 109Ag 2.9 MeV / u 109Ag 3/2-1/2- 109Ag 5/2-1/2- 204Rn 2+0+ 589 543 Andrew Robinson– ISOLDE Workshop: 18th November 2008

    13. Preliminary Results: 204Rn IS425: 184Hg Coulex non Doppler corrected γspectrum Doppler corrected 109Ag 3/2-1/2- 109Ag 5/2-1/2- 204Rn 2+0+ Andrew Robinson– ISOLDE Workshop: 18th November 2008

    14. Preliminary Results: 204Rn 204Rn + 120Sn 2.9 MeV / u 204Rn 2+0+ 589 543 Andrew Robinson– ISOLDE Workshop: 18th November 2008

    15. Preliminary Results: 202Rn 202Rn + 109Ag 2.9 MeV / u • New Sorting Routine • med file gROOT tree • General purpose sorting routine, easily • adaptedto variety of experiments. • Quickgallow analysis of data during run.(Possibility to adapt for true online sort) • Will be made available to Miniball users 109Ag 3/2-1/2- 109Ag 5/2-1/2- 202Rn 2+0+ 569 525 504 Andrew Robinson– ISOLDE Workshop: 18th November 2008

    16. Recoil Distance Method (RDM) measurements with plunger to obtain independent lifetimes. Conversion electron studies, help to determine properties of excited 0+ states and E0 content of jj transitions, related to rms charge radius. Summary • Successfully post-accelerated 204Rn and 202Rn–heaviest radioactive beam. • Observed Coulex of 204Rn & 202Rn. • Good data on 204Rn - extend work to 202Rn Summer 2009 Analysis is ongoing Andrew Robinson– ISOLDE Workshop: 18th November 2008