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Overview

Overview. Physics of Proton-rich Nuclei in the UK Mike Bentley (Univ. of York, UK). Outline: Recent Highlights: RISING physics at GSI Isospin studies at MSU Shapes and Symmetries (JYFL) Prospects: Short term developments Future facilities. Overview.

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Overview

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  1. Overview Physics of Proton-rich Nuclei in the UK Mike Bentley (Univ. of York, UK) • Outline: • Recent Highlights: • RISING physics at GSI • Isospin studies at MSU • Shapes and Symmetries (JYFL) • Prospects: • Short term developments • Future facilities Cosenors - Bentley

  2. Overview • How well does Isospin symmetry hold as A or Tz is increased? • Limits of nuclear existence • rp-process near the drip line • Evolution of nuclear shapes • n-p pairing

  3. Overview Current facilities (not exhasutive) JYFL – Jurogam + RITU + GREAT (recoil decay tagging) ANL – Gammasphere + FMA (recoil tagging) GSI – RISING stopped beam campaign (decay spectroscopy) REX-ISOLDE – Miniball (Coulex of exotic beams) Cosenors - Bentley

  4. Example: RISING at GSI RISING Rare Isotopic Spectroscopic INvestigations @ GSI = 15 x Cluster germaniums for (the most) exotic gamma-ray spectroscopy

  5. Example: RISING at GSI Fragment Separator (FRS) Focal Pane ID Stopped RISING • Chemically independent production mechanism for secondary • radioactive beams. • Time of flight from production to stopper ~x00ns. • Some ions transmitted in metastable states.

  6. Example: RISING at GSI

  7. Example: RISING at GSI

  8. Example: RISING at GSI

  9. Example: RISING at GSI A.B. Garnsworthy et al., Phys. Lett. B660, 326 (2008)

  10. Example: Fragmentation at MSU 10pnA 58Ni 600 mg/cm2 Be target 0.5 -1.0 × 106 pps (70% 56Ni) 188 mg/cm2 Be S800 Spectrograph NSCL Experiment #5117, March 2007 Texas A&M Cyclotron Institute: May 2007

  11. Example: Fragmentation at MSU J.R. Brown et al. (YORK) in prep (2008) S800 – Fragment ID Drip line Z A/Q Cosenors - Bentley

  12. Example: Fragmentation at MSU J.R. Brown et al. (YORK) in prep (2008) 53Mn First spectrsocopy of N=Z-3 nuclei above 33Ar 53Ni 49V 49Fe Cosenors - Bentley

  13. Example: Fragmentation at MSU J.R. Brown et al. (YORK) in prep (2008) Charge Symmetry Breaking – spin dependence (J=2 Anomaly) Decreasing overlap of two nucleons coupled to increasing spin J Observed A=54 MED Expected MED (2 holes) Cosenors - Bentley

  14. Example: Recoil Decay Tagging at Jyvaskyla Recoil decay tagging at Jyvaskyla JUROGAM GREAT Focal plane spectrometer RITU Gas-filled recoil separator Transmission 20-50 % TDR Total Data Readout Triggerless data acquisition system with 10 ns time stamping

  15. Example: Recoil Decay Tagging at Jyvaskyla Recoil-β-tagging using GREAT A.N. Steer et al, NIM A 565, 630(2006)  Useful for odd-odd N=Z, A>60-100 and N<Z nuclei in this region.  Fermi super allowed  decays,  ~10’s of ms half lives, ~10 MeV end point energies

  16. Example: Recoil Decay Tagging at Jyvaskyla T1/2 = 47 (5) ms 78Y Results B S Nara Singh et al, PRC 75 061301(R) 2007 78Y 74Rb

  17. Example: Recoil Decay Tagging at Jyvaskyla Neutron-proton pairing effects ? Shape-changing effects ?

  18. ADVERT Next in-beam campaign at GSI... PRESPEC – spokesperson MAB 2010-2011 Cosenors - Bentley

  19. Future facilities for p-rich nuclei Future facilities (not exhasutive) HIE-ISOLDE FAIR – HISPEC (in-beam) and DESPEC (decay spectroscopy) SPIRAL2 – in-beam reactions with exotic ions, or use of high-intensity LINAC beams Cosenors - Bentley

  20. Cosenors - Bentley

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