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Probing Rare Decays with OTPC: 2p Emission from 48Ni and Halo Structure Investigation

This study discusses the detection of rare decay events, specifically the 2p emission from 48Ni with a half-life of 2 ms, utilizing the Organic Time Projection Chamber (OTPC) at HIE-ISOLDE. We also examine the weak decay branches of 6He, particularly its decay into alpha and deuteron particles. The detection scheme employs atmospheric pressure gas and advanced imaging techniques, providing insights into particle tracks in three dimensions. Future applications include probing the halo structure through beta-delayed particle decays in isotopes like 8He, 11Li, and 14Be.

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Probing Rare Decays with OTPC: 2p Emission from 48Ni and Halo Structure Investigation

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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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