Positron Research Group -|-|- St Olaf College, Northfield, MN, USA
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Positron Research Group
Science Center 155
1520 St. Olaf Avenue
Northfield, MN 55057

Dr. Jason Engbrecht
engbrech@stolaf.edu
507-646-3849
507-646-3968 FAX

  [-web-]

Anna Legard '08
legard@stolaf.edu

Dan Endean '09
endean@stolaf.edu

David Green '09
greend@stolaf.edu

 

 

 

We use sodium dodecyl sulfate (SDS) solutions to create the micelles. The SDS solution is put into a test tube along with our radioactive source (22Na). The source releases positrons which pick up an electron and become positronium atoms that can diffuse into the micelles. The Ps lifetimes are determined by two plastic scintillators. These scintillators send their signals to constant fraction discriminators that filter and clean up the signals. A time-to-amplitude converter determines the Ps lifetimes and sends the data to digital I/O board where it is read by data collection software.

Solution, source, and scintillators Electronics (CFDs and TAC)