Rare decays with OTPC
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Transcript of Rare decays with OTPC
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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
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Probing the halo of 6He
100%
6He has a very weak decay branch to + d
d
2034 keVdQ 610db
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The spectrum of + d
R. Raabe et al., Phys. Rev. C80 (2009) 054307
Raabe
Anthony
Tursunov
Due to -background, it was not possible to
determine the spectrum below ECM 400 keV!
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OTPC detection scheme
TriggerRecording
system
d
charge amplification zone GEM foils
e
E
ionizationelectrons
light
HV electrodes
gas at atmospheric pressure
incoming bunch of 6He ions
gating electrode
CCD PMT
REX
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IS505, August 2012
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IS505, August 2012
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6He ions
beta decaysduring 650 ms after implantation
On-line images
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ddecay event
PMT
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PMT
ddecay event
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A different case – 8He
S. Mianowski et al., Acta Phys, Pol. B41 (2010) 449
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Decay of 14Be
H. Jeppsen et al. Nucl. Phys A709 (2002) 119
Beta delayed d, , t possible. Only 4 tritons seen.
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OTPC @ HIE-Isolde
Possible future application
probing the halo structure by -delayed particle decays in 8He, 11Li, 14Be
● 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
Advantages of HIE-Isolde
O
● 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)
The detector