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Rare decays with OTPC

Rare decays with OTPC. Marek Pf ü tzner University of Warsaw. 2p emission from 48 Ni 10 atoms, T 1/2 = 2 ms. HIE-ISOLDE Physics Coordination Group , September 3, 2012. Probing the halo of 6 He.  6 He has a very weak decay branch to a + d. The spectrum of a + d. Raabe. Anthony.

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Rare decays with OTPC

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  1. Rare decays with OTPC Marek Pfützner University of Warsaw 2p emission from 48Ni 10 atoms, T1/2 = 2 ms HIE-ISOLDE Physics Coordination Group, September 3, 2012

  2. Probing the halo of 6He 6He has a very weak decay branch to a + d

  3. The spectrum of a + d Raabe Anthony Tursunov R. Raabe et al., Phys. Rev. C80 (2009) 054307 Due to b-background, it was not possible to determine the spectrum below ECM  400 keV!

  4. OTPC detection scheme CCD PMT gas at atmospheric pressure incoming bunch of 6He ions d a HV electrodes ionizationelectrons e gating electrode charge amplification zone GEM foils light REX Recordingsystem Trigger

  5. IS505, August 2012

  6. IS505, August 2012

  7. On-line images 6He ions beta decaysduring 650 ms after implantation

  8. bddecay event PMT

  9. bddecay event PMT

  10. A different case – 8He S. Mianowski et al., Acta Phys, Pol. B41 (2010) 449

  11. Decay of 14Be H. Jeppsen et al.Nucl. Phys A709 (2002) 119 Beta delayed d, a, t possible. Only 4 tritons seen.

  12. OTPC @ HIE-Isolde O The detector • OTPC records tracks of charged particles in 3D • Ideal instrument for very rare decay modes • Needs 1 m2 od space (plus a rack od electronics nearby) • Simple and independent acquisition system (but large data volume) Advantages of HIE-Isolde • Energy sufficient for implantation of any ion • Small energy straggling, efficient implantation in a thin gas volume • Bunching makes search for rare particle channels easier Possible future applicationprobing the halo structure by b-delayed particle decays in 8He, 11Li, 14Be

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