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The Test Storage Ring at ISOL Facility: Experimental Physics Opportunities

This study showcases the potential of a storage ring coupled with an ISOL facility, covering technical challenges, astrophysics capabilities, nuclear reaction studies, atomic physics applications, and more. The project involves collaboration among scientists worldwide and aims to deliver crucial insights into various research fields.

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The Test Storage Ring at ISOL Facility: Experimental Physics Opportunities

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  1. A storage ring at an ISOL facility RiccardoRaabe KU Leuven, Instituutvoor Kern- enStralingsfysica (for Yuri Litvinov, GSI)

  2. The Test Storage Ring at Heidelberg Eur. Phys. J. Special Topics 207, 1-117 (2012) K. Blaum (MPI-K Heidelberg and GSI),Y. Blumenfeld (CERN), P.A. Butler (Univ. Liverpool),M. Grieser (MPI-K Heidelberg),Yu.A. Litvinov (Univ. Heidelberg and GSI),R. Raabe (KU Leuven), F. Wenander (CERN),Ph.J. Woods (Univ. Edinburgh) (eds.)

  3. Collaboration: 129 scientists from 47 institutions in 19 countries

  4. Possible layout at ISOLDE

  5. Possible layout at ISOLDE

  6. Technical challenges: charge breeder • Requirement: high charge states • Rigidity of the ring • Survival lifetimesvs cooling times • Experimental requirements(fully stripped, H- and He-like) Tests at BNL • Charge breeder upgrade: • High Energy Current and Compression HEC2

  7. Physics programme • Physics programme • AstrophysicsCapture, transfer reactions7Be half life • Atomic physicsEffects on half livesDi-electronic recombination • Nuclear physicsReaction studiesIsomeric statesDecay of halo statesLaser spectroscopyFission studies

  8. Half life of H-like 7Be K. Blaum, F. Bosch, Yu. Litvinov, K. Zuber • Half life of 7Be in the Sun • Produced νe rates • Electron screening test case 7Be3+? τ7Be≈300 s τ7Li≈9000 s cooling 2.3 s injection≈108 ions stacking decay

  9. Beta-delayed light-ion emission • Accurate measurements of • Branching ratios (often small!) channel identification efficiency • Energy emitted particles low thresholds resolution • Spatial correlations α α α

  10. Proton-emission decay of 11Be • Proton-emission decayof a neutron-rich nucleus! • Q-value: 281 keV • B.R. ≈ 10-8 D. Baye, E.M. Tursunov, PLB 696 (2011) 464

  11. Proton-emission decay of 11Be • Threshold problem • Decay at rest:Only energy of the decay is available • Decay in flight:Use the momentum of the beamEmission in a narrow cone • In the ring:Detection in annular arraysor after a bendIdentification through ΔE-E • T1/2 = 13.8 s  injection till saturation(a few 107 ions circulating) •  1 event / hour

  12. Isomeric states P. Walker • Long-living isomeric states • Neutron radioactivityin high-spin isomers • Purified isomeric beams

  13. Laser spectroscopy T. Cocolios • Few-electron systems→ atomic parameters can be calculated exactly • Fast-circulating beam→ atomic transitions in the deep UV can beDoppler-corrected into the visible range • Recirculation of beams→ enhanced probability of interaction • Some elements that can only be extracted as molecules→ molecules broken in EBIS → mono-atomic ion beams • Combine with electron cooler to (re-)populatestates of interest • Use as a tool to produce in-ring polarised beamsfor transfer reactions

  14. Atomic methods and physics F. Bosch, C. Brandau, Yu. Litvinov, D.W. Savin, S. Schippers • Study of atomic shells using dielectronic recombination deduce nuclear properties • Very sensitive (atomic cross sections),well-adapted to rare isotopes • Atomic data for astrophysics, fusion energy • Nuclear effects on atomic half-livesStudy in function of the magnetic moment

  15. Atomic methods and physics F. Bosch, C. Brandau, Yu. Litvinov, D.W. Savin, S. Schippers • Study of atomic shells using dielectronic recombination deduce nuclear properties C. Brandau, et al., Phys. Rev. Lett. 100, 073201 (2008) M. Lestinsky, et al., Phys. Rev. Lett. 100, 033001 (2008)

  16. Reaction measurements P. Butler, M. Heil, R.R., R. Reifarth, K. Sonnabend, P. Woods • Proton capture(astrophysics) • Transfer reactions • 26mAl(d,p)27Aldestruction of 26Al in core collapse supernovae Detector array funded by UK Gas-jet proposed by DK+S

  17. Extracted beams P. Butler, R. Page, S. Freeman, et al. cooling ≈0.5 s injection≈105 ions stacking ≈τ extraction ≈5 s • Cooled beamsin HELIOS-type spectrometer • Very good energy resolutionfor reactions at low beam intensity

  18. Conclusions • A storage ring coupled to an ISOL facilityis a unique instrumentoffering unique possibilities • Research scope is broader than nuclear physics • The possibility has been explored at HIE-ISOLDE→ opportunity within EURISOL DF

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