rare decays with otpc
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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
Probing the halo of 6He
100%
6He has a very weak decay branch to + d
d
2034 keVdQ 610db
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!
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
IS505, August 2012
IS505, August 2012
6He ions
beta decaysduring 650 ms after implantation
On-line images
ddecay event
PMT
PMT
ddecay event
A different case – 8He
S. Mianowski et al., Acta Phys, Pol. B41 (2010) 449
Decay of 14Be
H. Jeppsen et al. Nucl. Phys A709 (2002) 119
Beta delayed d, , t possible. Only 4 tritons seen.
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