Implementing a Coordinate Transformation for Scintillating Arrays

Student Author(s)

Jaclyn Brett
Branden Marks

Faculty Mentor(s)

Dr. Paul DeYoung

Document Type


Event Date



In the MoNA experiments at the National Superconducting Cyclotron Laboratory, three arrays of scintillators detect neutrons that decay from the nuclei produced in various reactions. Each array consists of stacked plastic bars, 64 to 144 in number. The interaction point of each neutron in an array is recorded with information about the specific bar and the location of the interaction within a single bar. However, this information is in the coordinate frame of the array. To obtain meaningful information about the momentum vector of the neutron, the positions where each particle interactions must be found within the coordinate frame of the laboratory. The original algorithm was only correct in cases where the arrays were horizontal, relative to the floor of the vault. A process was established for implementing coordinate transformation matrices to do these calculations for each array.


This material is based upon work supported by the National Science Foundation under grant No. PHY-1306074.

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