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¯ 3p spectroscopy and proton- ° width determination in the decay of 31 Ar

¯ 3p spectroscopy and proton- ° width determination in the decay of 31 Ar. Presented by Gunvor T. Koldste, Aarhus University. The decay of 31 Ar. Stable. Levels of 30 S important for astrophysics. IS476 in 2009: Limits on the ¡ p / ¡ ° ratio for 3 levels 1 contradict theory

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¯ 3p spectroscopy and proton- ° width determination in the decay of 31 Ar

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  1. ¯3p spectroscopy and proton-° width determination in the decay of 31Ar Presented by Gunvor T. Koldste, Aarhus University

  2. The decay of 31Ar Stable

  3. Levels of 30Simportant for astrophysics • IS476 in 2009: • Limits on the ¡p/¡° ratio for 3 levels • 1 contradict theory • 2 two orders of magnitude higher • Phys. Rev. C 87 (2013) 055808 • Spin from p-p correlations • Statistics limited… • This proposal: • ¡p/¡° ratios: • 40 protons from 4.69 MeV • 4 °‘s from 5.22 MeV • °‘s and protons from 4.81 MeV • Spin assignment of 5.22 MeV 5.85 5.22 4.69

  4. ¯3p-decay • IS476 in 2009: • Approx. 30 3p-events • Identified ¯3p-decay • From IAS • Higher lying levels • (partly) sequential • Populate higher lying levels in 29P • Publication in preparation From IAS • This proposal: • Approx. 500 3p-events • Precise B.R. for IAS • both 3p and 2p° • Thorough investigation • of decay mode Levels in 29P

  5. Setup • IS476 in 2009: • 42 % of 4¼ particle detection • 6 DSSSD’s • 4x300 ¹m, 1x69 ¹m, 1x500 ¹m • Only backing on 4 • Approx. 6 % of 4¼ ° detection • 2 Miniballdetectors • CaO target • Yield: approx. 1 31Ar per sec. • 16,17N contamination (N2) • 25 shifts used of 27 • This proposal: • 70 % of 4¼ particle detection • Compact setup of 6 DSSSD’s with backing • Approx. 25 % of 4¼ °detection • ISOLDE Decay Station • CaOnano-structured target: • Yield: 10 31Ar per sec. • Less contamination • 24 shifts in total

  6. Summary 24 shifts:CaOnano-structured target • 30S: • ¡p/¡° ratios: • 40 protons from 4.69 MeV • 4 °‘s from 5.22 MeV • °‘s and protons from 4.81 MeV • Spin assignment of 5.22 MeV • ¯3p: • Approx. 500 3p-events • Thorough investigation of decay mode • Which states in 31Cl • ¯-strength: • Fermi strength • IAS 1p-, 2p-, 3p, °-decay • Gamow-Teller strength • Correctly assigned above IAS

  7. Bonus slides

  8. ¯3p-decay Levels in 29P 5047 keV 4642 keV 4954 keV 4759 keV 3448 keV 4081 keV 4343 keV

  9. Spin determination from proton-proton angular correlations

  10. ¯2p-events

  11. B.R. for the decay of IAS

  12. 30S spectrum

  13. °-spectrum

  14. Levels of 30Simportant for astrophysics C B A ? 3 1 2 4

  15. ¡p/¡° for the4689 keV level gates #p < 16§5 #° = 10§4

  16. Levels of 30Simportant for astrophysics C B A ? 3 1 2 4

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