AstroBox - a new detection system for very low-energy protons from β -delayed p-decay - PowerPoint PPT Presentation

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AstroBox - a new detection system for very low-energy protons from β -delayed p-decay

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  1. AstroBox - a new detection system for very low-energy protons from β-delayed p-decay Alexandra Spiridon Cyclotron Institute Texas A&M University

  2. Acknowledgements • Cyclotron Institute, Texas A&M University • L. Trache • E. Simmons • M. McCleskey • B.T. Roeder • R.E. Tribble • CEA Saclay • E. Pollacco • Marc Riallot • Jean PhilipeMols • MariamKebbiri • IKP Köln • G. Pascovici

  3. Decay spectroscopy Beta- and beta-delayed proton-decay Explosive H-burning in novae & IAS in Tz=-3/2 nuclei Isospin mixing GT strength distribution bottleneck r. in novae 31Cl→31S*  30P(p,g)31S* 22Na depletion in novae 23Al→23Mg*  22Na(p,g)23Mg*

  4. Experimental setup – ‘Before’

  5. 5/2+ 7/2+ IAS Lower beta background Better energy resolution

  6. New detection setup - AstroBox

  7. New detection setup - AstroBox

  8. 24Mg 45A MeV 23Al 40A MeV Purity: ~90% Intensity: ~ 4000 pps First time - very pure & intense 23Al Primary beam 24Mg @ 45A MeV – K500 Cycl Primary target LN2 cooled H2 gas p=2 atm Secondary beam 23Al @ 40.2A MeV

  9. Isotope separation - MARS

  10. Implantation procedure – ‘Now’

  11. Measurements

  12. Results – Detection efficiency

  13. AstroBox - Results betas 866 579 267 206 keV Can go to Ep~80 keV Good peak separation Very sensitive – clear results within just ~2 hrs of statistics

  14. Thank you for your attention!

  15. Implantation procedure – ‘Before’