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Proton Emission from Deformed Rare Earth Nuclei: A Possible AIDA Physics Campaign

This paper discusses the potential AIDA physics campaign focused on proton emission from deformed rare earth nuclei, including the use of the Advanced Implantation Detector Array (AIDA) and the challenges associated with background due to beta decays. The paper also explores the possibility of proton measurements using AIDA.

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Proton Emission from Deformed Rare Earth Nuclei: A Possible AIDA Physics Campaign

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  1. Proton emission from deformed rare earth nuclei: A possible AIDA physics campaignPaul Sapple PRESPEC Decay Physics Workshop Brighton 12 January 2011

  2. AIDA for b, bp and p decays • Fusion evaporation reactions? • Gap in reactions that populate the deformed rare • earth region. • Exotic beams? • 238U primary beam at GSI could populate a significant • Number of nuclei in the region, with feasible yields.

  3. Advanced Implantation Detector Array • Variable number of Si planes (1 mm thickness). • Area 24 cm x 8 cm, or 8 cm x 8 cm. • Strip pitch 625 mm. • Front face for DE, back face for veto.

  4. Advanced Implantation Detector Array • AIDA will be positioned at “low-energy” section of • super FRS • Exotic nuclei with energy ~ 50 – 150 MeV / u. • Digital ASIC electronics • Dynamic range. • Fast overload recovery.

  5. Background due to b decays • Proton decaying state in 135Tb • populated by 92Mo(p6n)135Tb • reaction. • Background due to b decays. • AIDA Si 1 mm thick, cf. 60 mm P.J.Woods et al, Physical Review C69 (2004) 051302.

  6. Beta-delayed proton decay

  7. Simplest AIDA setup y x Assume exotic nuclei are implanted in the intermediate plane. 1 2 3 4 5 6 7 8 9 z

  8. Uniform distribution along z (beam) –axis. • Distributed in (x, y) plane with sx = sy = 2 cm. • 10, 000 initial events displayed. z y x

  9. Typical Qb in the deformed rare-earth region: Qb ~ 9.5 MeV. • To first approximation, assume peak of Eb spectrum at ~ Qb/2, with s ~ Qb/4. E / MeV P.Moller, J.R.Nix, and K.-L.Kratz, At. Data. Nucl. Data Tables 66, 131 (1997). S.-W.Xu et al, Physical Review C60 (1999) 061302.

  10. Energy distribution. 18,851 hits in total, from 10,000 initial events. Counts E / MeV 1 2 3 4 5 6 7 8 9

  11. Which detectors are hit? 18,851 hits in total, from 10,000 initial events. Number of hits Detector ID 1 2 3 4 5 6 7 8 9

  12. Track individual primary b+ particles through AIDA. • How many only interact in the detector of origin? • The simulation suggests that ~ 1% of primary events lead to multiplicity 1. Number of hits Number of detectors hit

  13. How many b+ particles stop within one pixel? Number of hits Number of detectors hit

  14. Proton measurements should be easier! • Replace electron simulations with protons. • Assume Ep = 3.5 MeV, with FWHM set to 0.5 MeV. • In this case, ~ 60% of protons are stopped within one pixel.

  15. Discussion / Questions

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