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Milan MATOŠ

TOF Mass Measurements: Status and Future (or When the Masses of the R-Process Nuclides will be Measured?). Milan MATOŠ. JINA Frontiers August 20, 2007. Known Masses (AME 2003). r-process. ETSFI-Q dripline. Mass Measurement Techniques.

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Milan MATOŠ

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  1. TOF Mass Measurements: Status and Future (or When the Masses of the R-Process Nuclides will be Measured?) MilanMATOŠ JINA Frontiers August 20, 2007

  2. Known Masses (AME 2003) r-process ETSFI-Q dripline

  3. Mass Measurement Techniques expected to be first to measure r-process masses

  4. usually Br acceptance ± several percent solutions Br measurement isochronicity t constant for fixed m/q even ifv1<v2 dispersive mode Principle of Time-of-Flight Mass Measurements

  5. Existing Time-of-Flight Mass Measurement Facilities Br distribution Br measurement isochronicity flight path linear multi-turn

  6. TOFI at Los Alamos

  7. SPEG at GANIL

  8. Isochronous Mass Spectrometryin ESR (at GSI) 10m

  9. IMS at GSI

  10. TOF-Br at the NSCL path length ~ 58m MCP: Position Resolution s < 0.5mm fast PMTs: Timing Resolution s ~ 30ps see next talk by A. Estrade

  11. Comparisons

  12. Comparisons Isochronicity vs. Br measurement difficult to set up easy to set up no Br measurement needed (no detector) position sensitive required limited m/q range for one setting unlimited m/q range for one setting linear vs. multi-turn worse resolution better resolution total statistics < 1000pps limitation on total statistics < 10pps isomeric contamination: fully covered by g detectors isomeric contamination: resolved for E > 500keV transmission ~ 10% transmission ~ 0.1% low energy vs. high energy large charge contamination low charge contamination large energy losses in detectors low large energy losses in detectors longer flight time shorter flight time

  13. TOF (yellow) vs. Penning traps (blue)

  14. RIKEN – BigRIPS

  15. RIKEN – BigRIPS+ ZDS E ~ 350MeV/A TOF start/stop (88 m) Br measurement

  16. FAIR – isochronous CR E ~ 1.5GeV/A ILIMA project

  17. ISF at MSU E ~ 250MeV/A

  18. ISF at MSU E ~ 250MeV/A

  19. Future Facilities Rates timelines Big RIPS: 2007 first experiments FAIR: 2012 first experiments 2015 completion ISF: 2016 if approved rate needed ~ 0.01pps rate needed ~ 0.1pps rate needed ~ 0.01pps

  20. Conclusions in 5 years – first large r-process areas by RIKEN Z < 40 & Z~50 in 10 years – Z < 40 & Z~50 fully covered by MSU or GSI In 15 years – Penning trap measurements in the r-process area penetration into more exotic r-process areas In 20 years – ???? • competition has already started • who will be the winner? • depends on decisions • many surprises are expected • theoreticians (nuclear models, r-process) • should be prepared JINA should be involved

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