My work in NCT project

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My work in NCT project

• Jau-Shian Liang
• Department of Physics, NTHU / SSL, UCB
• 2007/03/20

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Nuclear Compton Telescope
( M. E. Bandstra, 2006 IEEE )
( E, x, y, z, t )
( S. E. Boggs, CIS workshop 2005 _at_ NTHU )
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Comparison of the different Compton telescopes
The left figure shows the classical COMPTEL type
instrument. The central picture shows a Compton
telescope consisting of several thick layers in
which the photon undergoes multiple Compton
scatterings. The redundant scatter information
allows to determine the direction of motion of
the photon. The right figure on the right shows
an electron tracking Compton telescope like MEGA.
The track of the electron determines the
direction of motion of the photon.
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The 4 different event types of a tracking Compton
and pair telescope
Left to right Untracked Compton events tracked
Compton events high-energy tracked Compton
events with incomplete absorption pair events.
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Current Work

• learning the MEGAlib for simulation and data
  analysis

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MEGAlib(Medium Energy Gamma-ray Astronomy
library)

• A set of data analysis tools for modern Compton
  telescopes from simulation/measurement via event
  reconstruction to image reconstruction
• MEGAlib was originally written for data analysis
  of the MEGA Compton and Pair telescope

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Simple Practice
two layers of Ge scintillators
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511keV point source
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1MeV ring shape source with 30 degree radius
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Future Work

• to do the simulation of 511 keV line distribution
  with NCT mass model

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NCT mass model
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Thank you