1 / 16

¯ 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

lucita
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related